Quick release structure and cart

Abstract

The utility model provides a quick release structure which is used for connecting wheels and a frame of a cart, the frame comprises a vertical pipe, the wheels are rotationally installed on a wheel carrier, the quick release structure is characterized by comprising a shaft sleeve, a locking piece, an elastic piece and a shaft rod, the vertical pipe, the shaft sleeve and the shaft rod are sequentially arranged from top to bottom in a sleeving mode, one end of the shaft rod is fixed to the wheel carrier, and a clamping groove is formed in the other end of the shaft rod; a first through hole is formed in the peripheral wall of the shaft sleeve, a second through hole corresponding to the first through hole is formed in the peripheral wall of the vertical pipe, a protruding part and a hook are arranged on the locking piece, the protruding part penetrates through one end of the first through hole and then stretches out of the second through hole, the elastic piece stretches out of the other end of the first through hole and then abuts against the inner wall of the vertical pipe, and the hook is suitable for being connected with the clamping groove in a clamped mode. When the wheel needs to be disassembled, only the protruding part needs to be pressed to enable the locking piece to move inwards, the hook and the clamping groove are not matched at the moment, then the shaft rod is pulled out, the wheel can be disassembled, the whole disassembling process is easy to operate, other tools are not needed, and the disassembling efficiency of the wheel is improved.

Description

Technical Field

[0001] This application relates to the field of trolley technology, and in particular to a quick-release structure and trolley. Background Technology

[0002] With the diversification of people's lifestyles, camping is becoming increasingly popular as a leisure activity. As an important tool for carrying supplies, the design and function of a stroller directly affect the convenience and comfort of camping.

[0003] Currently, some strollers on the market have wheels that are inserted into the frame and riveted with pins, making disassembly difficult and time-consuming, usually requiring the assistance of professional tools.

[0004] The inconvenience of removing the cart's wheels increases packaging and transportation costs, and when wheels need to be replaced or maintenance is required, specialized tools or services must be sought, which not only increases the cost of use but also reduces the ease of use. Utility Model Content

[0005] This invention provides a quick-release structure to solve the technical problem that the wheels of a trolley are not easy to remove in the prior art.

[0006] To achieve the above objectives, the quick-release structure proposed in this application is used to connect the wheels and frame of a trolley. The frame includes a riser, and the wheels are rotatably mounted on a wheel frame. The quick-release structure comprises a bushing, a locking element, an elastic element, and a shaft. The riser, bushing, and shaft are sequentially sleeved from top to bottom. One end of the shaft is fixed to the wheel frame, and the other end of the shaft forms a groove. The bushing has a first through hole on its peripheral wall, and the riser has a second through hole corresponding to the first through hole on its peripheral wall. The locking element has a protrusion and a hook. The protrusion passes through one end of the first through hole and extends out of the second through hole. The elastic element extends out of the other end of the first through hole and abuts against the inner wall of the riser. The hook is adapted to engage with the groove.

[0007] Optionally, in one embodiment, the lock member has a mounting groove at one end facing away from the protrusion, one end of the spring extends into the mounting groove and abuts against the bottom wall of the mounting groove, and the other end of the spring abuts against the inner wall of the riser.

[0008] Optionally, in one embodiment, the end of the shaft away from the wheel frame is provided with a tapered head, and the head and the wheel frame define the slot; the hook is provided with a guide slope on the side facing the wheel frame, and the guide slope is used to cooperate with the head.

[0009] Optionally, in one embodiment, the lock is provided with sliding grooves on both sides, and the inner wall of the first through hole is provided with sliding rails on both sides, the sliding rails being slidably disposed in the corresponding sliding grooves.

[0010] Optionally, in one embodiment, the groove is a concave V-shaped groove, and the rail is a convex V-shaped rail.

[0011] Optionally, in one embodiment, the outer peripheral wall of the wheel frame is square, and the inner wall of the bushing is provided with a square hole adapted to the wheel frame, and the wheel frame is installed in the square hole.

[0012] This application also proposes a trolley, which includes a frame, wheels and the quick-release structure described above. The frame includes multiple uprights, and the wheels are arranged in a one-to-one correspondence with the uprights. The wheels are rotatably mounted on a wheel frame, and the wheel frame is connected to the uprights through the quick-release structure.

[0013] Optionally, in one embodiment, the trolley includes a canopy and a plurality of uprights fixedly connected to the canopy, wherein the plurality of uprights are connected one-to-one with the ends of the plurality of vertical tubes away from the wheels, so that the canopy covers the frame.

[0014] Optionally, in one embodiment, the trolley further includes a pull rod connected to the frame. The pull rod includes a handle, a mounting base, a vertical rod, a first side rod, and a second side rod. One end of the vertical rod is connected to the handle, and the other end of the vertical rod extends into the mounting base and can slide up and down relative to the mounting base. The first side rod and the second side rod are symmetrically arranged on both sides of the mounting base, and both the first side rod and the second side rod are hinged to the mounting base.

[0015] Optionally, in one embodiment, the frame is square in shape and includes a front frame, a left frame, a rear frame, a right frame, and a bottom frame that are connected to each other, wherein the rear frame is rotatably connected to the bottom frame.

[0016] The quick-release structure provided in this application includes a bushing, a locking element, an elastic element, and a shaft. A protrusion and a hook are provided on the locking element. The protrusion extends from a second through hole after passing through a first through hole. Both ends of the elastic element are connected to the inner wall of the riser and the locking element, respectively. The elastic deformation of the elastic element allows the hook to engage with the slot. When the wheel needs to be removed, simply press the protrusion to move the locking element inward, disengaging the hook from the slot. Then, pull out the shaft to remove the wheel. The entire removal process is simple and requires no additional tools, improving wheel removal efficiency and enhancing the trolley's flexibility. This allows the trolley to change tires in different scenarios, such as using snow tires in winter or beach wheels on the beach. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a trolley provided in one embodiment of this application;

[0019] Figure 2 A structural schematic diagram of the trolley provided in this application from another angle;

[0020] Figure 3 A bottom view of the cart provided for this application;

[0021] Figure 4 The diagram showing the changing states of the trolley provided in this application;

[0022] Figure 5 A cross-sectional schematic diagram of a portion of the structure of the trolley provided in this application;

[0023] Figure 6 An exploded schematic diagram of a portion of the structure of the cart provided in this application;

[0024] Figure 7 A structural diagram of the quick-release structure provided in this application;

[0025] Figure 8 An assembly diagram of the lock provided in this application;

[0026] Figure 9 This is a schematic diagram of the structure of a trolley provided in yet another embodiment of this application;

[0027] Figure 10 This is a schematic diagram of the structure of a trolley provided in yet another embodiment of this application;

[0028] Figure 11 A schematic diagram of the structure of the canopy provided in this application;

[0029] Figure 12 This is a structural schematic diagram of the tie rod provided in this application;

[0030] Figure 13 The diagram showing the changing states of the tie rod provided in this application;

[0031] Figure 14 This is a schematic diagram of the structure of a trolley provided in yet another embodiment of this application;

[0032] Figure 15This is a schematic diagram of the structure of a trolley provided in another embodiment of this application;

[0033] Figure 16 The diagram showing the changing states of the trolley provided in this application;

[0034] Figure 17 This is a structural schematic diagram of the tie rod provided in this application;

[0035] Figure 18 A schematic cross-sectional view of the tie rod along AA provided in this application;

[0036] Figure 19 A schematic cross-sectional view of the tie rod along BB provided in this application;

[0037] Figure 20 An exploded view of the tie rod provided in this application;

[0038] Figure 21 An exploded view of a portion of the tie rod structure provided in this application;

[0039] Figure 22 This is a structural schematic diagram of the tie rod provided in this application;

[0040] Figure 23 A schematic diagram of the trolley provided in this application;

[0041] Figure 24 A schematic diagram of the structure of the retaining frame provided in this application;

[0042] Figure 25 The diagram showing the changing states of the retaining frame provided in this application;

[0043] Figure 26 An exploded view of a portion of the structure of the retaining frame provided in this application.

[0044] Explanation of icon numbers:

[0045] 1. Frame; 2. Tie rod; 3. Wheels; 4. Storage space;

[0046] 11. Front frame; 12. Rear frame; 13. Left side frame; 14. Right side frame; 15. Bottom frame; 16. Riser; 17. X-shaped connecting rod; 18. First rod; 19. Second rod;

[0047] 21. First riser; 22. Second riser; 23. Third riser; 24. Fourth riser; 25. Fifth riser; 26. Sixth riser; 27. First fixing block; 28. Second fixing block; 29. ​​Sliding block;

[0048] 31. Connecting seat; 32. Base rod; 33. Hinge groove;

[0049] 41. Front wheel; 42. Rear wheel;

[0050] 50. Quick-release mechanism; 51. Bushing; 52. Locking element; 53. Elastic element; 54. Shaft;

[0051] 61. Head; 62. Slot; 63. First through hole; 64. Second through hole; 65. Protrusion; 66. Hook; 67. Mounting groove; 68. Slide groove; 69. Slide rail;

[0052] 70. Canopy; 71. Pole; 72. Straps;

[0053] 81. Handle; 82. Mounting base; 83. Vertical rod; 84. First side rod; 85. Second side rod;

[0054] 1a. Frame; 2a. Tie rod; 3a. Wheel;

[0055] 11a, Front frame; 12a, Rear frame; 13a, Left side frame; 14a, Right side frame; 15a, First bottom frame; 16a, Second bottom frame; 17a, Riser; 18a, X-shaped connecting rod; 19a, First rod; 20a, Second rod;

[0056] 21a, First riser; 22a, Second riser; 23a, Third riser; 24a, Fourth riser; 25a, Fixed block; 26a, Sliding block; 27a, Base frame;

[0057] 31a, First horizontal tube; 32a, Second horizontal tube; 33a, Third horizontal tube;

[0058] 41a, Handle; 42a, First vertical rod; 43a, Second vertical rod; 44a, Telescopic mechanism; 45a, Rotating mechanism;

[0059] 51a, rod sleeve; 52a, steel column; 53a, steel column base; 54a, spring; 55a, button; 56a, slot; 57a, first through hole; 58a, second through hole;

[0060] 61a. Fork body; 62a. Mounting post;

[0061] 71a, First shell; 72a, Second shell;

[0062] 81a, baffle; 82a, pull strap; 83a, fork; 84a, limit shaft; 85a, rotating block; 86a, shaft hole; 87a, straight section; 88a, arc section.

[0063] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0064] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0065] like Figures 1-13 As shown, this embodiment discloses a stroller, including a frame 1, a pull rod 2, and wheels 3. The wheels 3 are installed at the bottom of the frame 1, and the pull rod 2 is installed at the front of the frame 1. The frame 1 defines a storage space 4, in which users can place items, pets, etc. in the storage space 4 and push or pull the stroller to the destination using the pull rod 2, which can save a lot of physical effort and improve the portability of travel.

[0066] Specifically, such as Figures 1-3 As shown, the frame 1 is roughly square in shape. The frame 1 includes a front frame 11, a rear frame 12, a bottom frame 15, a left side frame 13, a right side frame 14, and several vertical tubes 16. The front frame 11, rear frame 12, left side frame 13, and right side frame 14 are all connected by multiple X-shaped connecting rods 17 in sequence. Each X-shaped connecting rod 17 includes a first rod 18 and a second rod 19. The middle part of the first rod 18 and the middle part of the second rod 19 are riveted together by rivets so that the first rod 18 and the second rod 19 can rotate relative to each other.

[0067] Please see Figures 1-4The system includes several risers 16, including a first riser 21, a second riser 22, a third riser 23, and a fourth riser 24. The front frame 11 and the left side frame 13 are connected via the first riser 21; the front frame 11 and the right side frame 14 are connected via the second riser 22; the right side frame 14 and the rear frame 12 are connected via the third riser 23; and the left side frame 13 and the rear frame 12 are connected via the fourth riser 24. Each riser 16 is equipped with a first fixing block 27, a second fixing block 28, and a sliding block 29. The first fixing block 27 is fixedly installed at the top of the riser 16, the second fixing block 28 is fixedly installed at the bottom of the riser 16, and the sliding block 29 is installed on the riser 16 and can slide between the first fixing block 27 and the second fixing block 28. On the same side, the upper end of the X-shaped connecting rod 17 located on the outer side is hinged to the first fixed block 27, and the lower end is hinged to the sliding block 29. Furthermore, adjacent X-shaped connecting rods 17 on the same side are connected by hinges. Thus, all four sides of the frame 1 can be folded, and the four uprights 16 are folded inwards, greatly reducing the volume occupied by the folded trolley, making it convenient for users to carry and improving usability. During the folding process of the frame 1, the first fixed block 27 remains stationary, while the sliding block 29 slides along the uprights 16 towards the second fixed block 28, causing the X-shaped connecting rod 17 to rotate, thereby achieving the folding of the frame 1. The folding method is relatively simple, convenient to use, and occupies little space. Additionally, the second fixed block 28 can abut against the sliding block 29 from below, providing a buffer as the slider slides to the bottom.

[0068] like Figure 3 As shown, the base frame 15 includes a connecting seat 31 and four base rods 32. The four base rods 32 are arranged in an X-shape on the connecting seat 31. One end of each base rod 32 is hinged to the connecting seat 31, and the other end of each base rod 32 is hinged to the corresponding second fixing block 28. Thus, the base frame 15 can be folded by rotating each base rod 32. Specifically, the connecting seat 31 is provided with a hinge groove 33 that matches each base rod 32. Each base rod 32 is hinged in the corresponding hinge groove 33. The opening of the hinge groove 33 faces the ground, so that each base rod 32 can only rotate downwards. When the user pulls the connecting seat 31 upwards, the base rod 32 rotates downwards and drives the upright tube 16 to retract inwards, realizing the folding of the trolley.

[0069] In some embodiments, please refer to Figures 1-3The riser 16 also includes a fifth riser 25 and a sixth riser 26. The fifth riser 25 is vertically positioned in the middle of the left frame 13, and the sixth riser 26 is vertically positioned in the middle of the right frame 14. The bottom frame 15 consists of two connecting seats 31 and eight bottom rods 32. Each bottom rod 32 is hinged to the corresponding connecting seat 31 to form two sets of X-shaped structures. Both sets of X-shaped structures are hinged to the second fixing blocks 28 on the fifth riser 25 and the sixth riser 26. The trolley can be folded by simultaneously pulling up the two connecting seats 31, thereby causing each riser 16 to fold inward. In this embodiment, by designing two sets of X-shaped structures, the trolley's carrying space is further increased, allowing more items to be placed. At the same time, the trolley's structure is more stable and its performance is better.

[0070] Optionally, in one implementation, please refer to Figure 1 and Figure 6 The wheel 3 includes a front wheel 41 and a rear wheel 42, with two front wheels 41 and two rear wheels 42. The two front wheels 41 are connected to the first riser 21 and the second riser 22, respectively, and the two rear wheels 42 are connected to the third riser 23 and the fourth riser 24, respectively. In this embodiment, the two rear wheels 42 are connected to the third riser 23 and the fourth riser 24 via quick-release structures 50, which allows for rapid disassembly and installation of the rear wheels 42, facilitating transportation, carrying, and subsequent maintenance and replacement.

[0071] For details, please refer to Figures 5-8 The quick-release structure 50 includes a bushing 51, a locking element 52, an elastic element 53, and a shaft 54. The riser 16, bushing 51, and shaft 54 ​​are sequentially fitted from top to bottom. The locking element 52 and the elastic element 53 are located inside the bushing 51. The rear wheel 42 is rotatably mounted on the wheel frame. One end of the shaft 54 ​​can be fixed to the wheel frame by a threaded connection. The other end of the shaft 54 ​​is provided with a conical head 61. A groove 62 is defined between the head 61 and the wheel frame. The bushing 51 has a first through hole 63 on its peripheral wall, and the riser 16 has a second through hole 64 on its peripheral wall. The locking element 52 has a protrusion 65 and a hook 66. The protrusion 65 passes through one end of the first through hole 63 and extends out from the second through hole 64. The elastic element 53 extends out from the other end of the first through hole 63 and contacts the inner wall of the riser 16. The hook 66 is adapted to engage with the groove 62.

[0072] In some alternative implementations, please refer to Figure 5 and Figure 7 The elastic element 53 can be a spring. The locking element 52 has a mounting groove 67 at one end facing away from the protrusion 65. One end of the spring extends into the mounting groove 67 and abuts against the bottom wall of the mounting groove 67. The other end of the spring abuts against the inner wall of the riser 16.

[0073] In some alternative embodiments, the slot 62 is an annular slot 62, and the side of the hook 66 facing the wheel frame is a guide slope. The guide slope of the hook 66 and the conical head 61 cooperate to make the hook 66 easier to be inserted into the slot 62, thereby improving the installation efficiency of the rear wheel 42.

[0074] In some alternative implementations, such as Figure 8 As shown, to ensure that the locking member 52 can be quickly and reliably assembled with the first through hole 63 on the bushing 51, a sliding groove 68 is provided on each of the two sides of the locking member 52, and a slide rail 69 is provided on each of the two sides of the inner wall of the first through hole 63. The sliding groove 68 and the slide rail 69 are adapted to each other. Preferably, the sliding groove 68 can be a V-shaped groove or a square groove, and the slide rail 69 can be a corresponding V-shaped track or a square track.

[0075] In some alternative implementations, such as Figure 5 and Figure 6 As shown, the outer peripheral wall of the wheel frame is square, and the bushing 51 has a square hole that matches the wheel frame, into which the wheel frame extends. It can be understood that, through the square hole and the square wheel frame, when the wheel frame is installed in the bushing 51, the wheel frame will not rotate relative to the bushing 51, preventing the wheel frame from rotating and causing the wheel 3 to rotate synchronously, thus ensuring more stable operation of the wheel 3.

[0076] When assembling the quick-release structure 50 with the riser 16, the spring can be installed in the mounting groove 67 first, and the locking piece 52 can be installed in the first through hole 63 of the bushing 51. Then, the riser 16 is fitted onto the outer circumference of the bushing 51. At this time, the protrusion 65 abuts against the inner wall of the riser 16, causing the spring to be in a compressed state. When the first through hole 63 corresponds to the second through hole 64, the spring returns to its original shape, allowing the protrusion 65 to extend from the second through hole 64, thereby completing the installation between the quick-release structure 50 and the riser 16. Figure 5 and Figure 7 As shown, when installing the rear wheel 42 and wheel frame, first fix the axle 54 to the wheel frame and insert the axle 54 into the bushing 51. When the conical head 61 of the axle 54 contacts the hook 66, due to the guide slope on the hook 66, the bottom of the hook 66 will move towards the inner wall of the riser tube 16 after being subjected to force, so that the head 61 can move to the inside of the hook 66. Then the spring returns to its deformation and drives the locking piece 52 towards... Figure 7 The hook 66 moves to the left, causing it to engage with the slot 62.

[0077] When the rear wheel 42 needs to be replaced, simply press the protrusion 65 so that the lock 52 faces the center. Figure 7 Move it to the right, at which point the hook 66 will disengage from the slot 62, and then pull out the axle 54 to disassemble the rear wheel 42 and the wheel frame. The overall operation is simple, time-saving and labor-saving.

[0078] Optionally, in one implementation, please refer to Figure 9 In this embodiment, the two front wheels 41 and the two rear wheels 42 can be replaced with beach wheels through the quick-release structure 50, which makes the stroller have better grip on soft ground such as sand, increasing the practicality and flexibility of the stroller; in addition, beach wheels are usually larger and heavier, which helps to distribute the weight of the vehicle, reduce bumps on uneven ground, and provide a smoother riding experience.

[0079] In some embodiments, such as Figure 1 As shown, a motor can be installed inside the rear wheel 42. The motor is powered by a battery to drive the rear wheel 42 to rotate, making it easier to push the cart, reducing the burden of manpower, and saving time and effort.

[0080] Optionally, in one implementation, please refer to Figure 10 and Figure 11 A canopy 70 is installed above the frame 1. The canopy 70 is connected to the first vertical pipe 21, the second vertical pipe 22, the third vertical pipe 23 and the fourth vertical pipe 24 respectively through four uprights 71. It can be understood that by setting up the canopy 70, it can shield users from the sun on sunny days and prevent direct sunlight. On rainy days, it can help users avoid rain and prevent rainwater from wetting users and items inside the vehicle, greatly improving the user experience.

[0081] In some embodiments, the pole 71 and the riser 16 can also be connected by the quick-release structure 50 described above, which makes it convenient for users to remove the canopy 70 when it is not needed, thus improving the efficiency of the canopy 70’s installation and removal.

[0082] Please see Figure 11 The outer perimeter of the canopy 70 is provided with multiple straps 72 at intervals. When users are camping outdoors, they can tie each strap 72 to the ground pegs to increase the stability of the canopy 70 and prevent it from tipping over or moving due to excessive wind force, thereby reducing the risk of injury to people or objects around it.

[0083] Optionally, in one implementation, please refer to Figure 1 , Figure 11 and Figure 12The pull rod 2 includes a handle 81, a mounting base 82, a vertical rod 83, a first side rod 84, and a second side rod 85. One end of the vertical rod 83 is connected to the handle 81, and the other end of the vertical rod 83 extends into the mounting base 82 and can slide up and down relative to the mounting base 82. The first side rod 84 and the second side rod 85 are symmetrically arranged on both sides of the mounting base 82, and both the first side rod 84 and the second side rod 85 are hinged to the mounting base 82. When the frame 1 is folded, the first side rod 84 and the second side rod 85 can move closer to each other, and by sliding the vertical rod 83, the vertical rod 83 drives the handle 81 to move closer to the mounting base 82, effectively reducing the space occupied by the pull rod 2 in the height direction, making it easier to store the trolley.

[0084] In some embodiments, please refer to Figure 14 The rear frame 12 is rotatably connected to the bottom frame 15, making it easier to load and unload goods on the trolley, saving time and effort, and improving portability. For example, the rear frame 12 can be hinged to the bottom frame 15, allowing the rear frame 12 to rotate outward; preferably, the maximum rotation angle of the rear frame 12 is 90°.

[0085] like Figures 15-26 As shown, another embodiment of this application discloses a double-layer trolley, including a frame 1a, a pull rod 2a, and wheels 3a. The pull rod 2a is installed on the front side of the frame 1a, and the wheels 3a are installed on the bottom of the frame 1a. The frame 1a is generally square in shape and includes a front frame 11a, a rear frame 12a, a left side frame 13a, a right side frame 14a, a first bottom frame 15a, a second bottom frame 16a, and several uprights 17a. The first bottom frame 15a and the second bottom frame 16a are vertically spaced on each upright 17a. In this embodiment, by setting the trolley to a double-layer structure, the capacity of the trolley is increased, allowing more items to be transported in a single trip.

[0086] Specifically, such as Figure 15 and Figure 16 As shown, the left frame 13a and the right frame 14a are arranged opposite to each other. Both the left frame 13a and the right frame 14a are composed of multiple X-shaped connecting rods 18a connected in sequence. Each X-shaped connecting rod 18a includes a first rod body 19a and a second rod body 20a. The middle part of the first rod body 19a and the middle part of the second rod body 20a are riveted together by rivets so that the first rod body 19a and the second rod body 20a can rotate relative to each other.

[0087] The risers 17a include a first riser 21a, a second riser 22a, a third riser 23a, and a fourth riser 24a. The front frame 11a and the left side frame 13a are connected by the first riser 21a, the front frame 11a and the right side frame 14a are connected by the second riser 22a, the right side frame 14a and the rear frame 12a are connected by the third riser 23a, and the left side frame 13a and the rear frame 12a are connected by the fourth riser 24a. Each riser 17a is provided with a fixing block 25a and a sliding block 26a. The fixing block 25a is fixedly installed on the top of the riser 17a, and the sliding block 26a is slidably installed on the riser 17a. On the same side, the upper end of the X-shaped connecting rod 18a located on the outer side is hinged to the fixed block 25a, and the lower end is hinged to the sliding block 26a. Furthermore, two adjacent X-shaped connecting rods 18a on the same side are connected by hinges. In this way, the left frame 13a and the right frame 14a can be folded, allowing the trolley to be folded in the front-back direction, effectively reducing the size of the trolley, making it convenient for users to carry when going out, and meeting the user's convenience requirements.

[0088] During the folding process of frame 1a, fixed block 25a remains stationary, while sliding block 26a slides down along riser 17a to drive X-shaped connecting rod 18a to rotate, thereby realizing the folding of frame 1a. The folding method is relatively simple, convenient to use, and occupies little space.

[0089] like Figure 15 As shown, the first bottom frame 15a is positioned closer to the wheel 3a than the second bottom frame 16a, meaning the first bottom frame 15a is located below the second bottom frame 16a. Both the first bottom frame 15a and the second bottom frame 16a include two base frames 27a, one of which is connected to the front frame 11a, and the other is connected to the rear frame 12a. The two base frames 27a are hinged to each other. During folding, the hinged portions at the center of the two base frames 27a face upwards, causing the lower surfaces of the two base frames 27a to gradually approach each other, thus moving the front frame 11a and the rear frame 12a towards the center, completing the flat folding of the entire frame 1a.

[0090] Both the front frame 11a and the rear frame 12a include a first horizontal tube 31a, a second horizontal tube 32a, and a third horizontal tube 33a arranged sequentially at intervals. The two ends of the first horizontal tube 31a are connected to the tops of the first vertical tube 21a and the second vertical tube 22a, respectively. The two ends of the second horizontal tube 32a are connected to the middle parts of the first vertical tube 21a and the second vertical tube 22a, respectively, and the second bottom frame 16a is fixed to the second horizontal tube 32a. The two ends of the third horizontal tube 33a are connected to the bottoms of the first vertical tube 21a and the second vertical tube 22a, respectively, and the first bottom frame 15a is fixed to the third horizontal tube 33a. In addition, the structure of the rear frame 12a is the same as that of the front frame 11a, and the way the rear frame 12a cooperates with the first bottom frame 15a and the second bottom frame 16a is also the same as that of the front frame 11a, which will not be described again here.

[0091] In some embodiments, please refer to Figure 17 and Figure 18 The pull rod 2a includes a handle 41a, a first vertical rod 42a, a second vertical rod 43a, a telescopic mechanism 44a, and a rotating mechanism 45a. The first vertical rod 42a and the second vertical rod 43a are connected by the telescopic mechanism 44a, so that the first vertical rod 42a can slide relative to the second vertical rod 43a to realize the extension and retraction of the pull rod 2a. The handle 41a is located at the end of the first vertical rod 42a away from the telescopic mechanism 44a. The end of the second vertical rod 43a away from the telescopic mechanism 44a is connected to the frame 1a through the rotating mechanism 45a, so that the pull rod 2a can rotate relative to the frame 1a.

[0092] For details, please refer to Figure 17 , Figure 18 , Figure 20 and Figure 21 The telescopic mechanism 44a includes a sleeve 51a, two steel columns 52a, a steel column base 53a, a spring 54a, and two buttons 55a. The second vertical rod 43a is sleeved on the first vertical rod 42a, and the sleeve 51a is fixed to the outer peripheral wall of the second vertical rod 43a. The two buttons 55a are respectively installed on both sides of the sleeve 51a. The steel column base 53a is installed inside the first vertical rod 42a, and the steel column base 53a has a transverse through slot 56a. The two steel columns 52a are respectively installed in the slot 56a. At both ends of 6a, springs 54a are installed in slots 56a. One end of spring 54a contacts one of the steel columns 52a, and the other end of spring 54a contacts the other steel column 52a. The first vertical rod 42a has two first through holes 57a at positions corresponding to slots 56a. The two first through holes 57a are set one-to-one with the two steel columns 52a. When spring 54a is in the extension and retraction state, steel columns 52a pass through the first through holes 57a and extend out of the first vertical rod 42a.

[0093] The second vertical rod 43a has two opposing second through holes 58a. Two buttons 55a correspond one-to-one with the two second through holes 58a. When the telescopic mechanism 44a is locked, the spring 54a is in a telescopic state. The end of each steel column 52a furthest from the spring 54a passes through the first through hole 57a and the second through hole 58a in sequence and abuts against the corresponding button 55a. In this example, because the steel column 52a passes through both the first through hole 57a and the second through hole 58a simultaneously, the first vertical rod 42a cannot slide relative to the second vertical rod 43a, thus achieving the extension of the pull rod 2a.

[0094] When it is necessary to retract the lever 2a, simply press the buttons 55a on both sides. The buttons 55a squeeze the two steel columns 52a inward and compress the spring 54a, so that the steel columns 52a retract into the second through hole 58a on the second vertical rod 43a. At this time, pressing down the first vertical rod 42a will cause the first vertical rod 42a to slide inside the second vertical rod 43a, thereby retracting the lever 2a.

[0095] In some embodiments, please refer to Figure 19 and Figure 22 The rotating mechanism 45a includes a fork 61a and a mounting post 62a. The fork 61a is fixed to the third horizontal tube 33a. The mounting post 62a is located between the two side plates of the fork 61a, and both sides of the mounting post 62a are hinged to the two side plates of the fork 61a respectively. The end of the second vertical rod 43a away from the handle 41a is fixedly connected to the fork 61a. Thus, the rotation of the mounting post 62a drives the second vertical rod 43a to rotate, which in turn drives the pull rod 2a to rotate. This can accommodate users of different heights, increase the applicable scenarios of the trolley, and improve the convenience of using the trolley.

[0096] In some embodiments, please refer to Figure 20 The handle 41a includes a first housing 71a and a second housing 72a. The first housing 71a and the second housing 72a can be connected by a snap fastener. The first housing 71a, the second housing 72a and the first vertical rod 42a are all provided with corresponding screw holes. The first housing 71a and the second housing 72a can be fixed to the first vertical rod 42a by screws.

[0097] Alternatively, in one embodiment, please refer to Figures 23-26 The rear frame 12a includes a retaining frame 81a, which is rotatably connected to the third horizontal tube 33a of the rear frame 12a. Each side of the retaining frame 81a is provided with a pull strap 82a, which is connected to the third vertical tube 23a and the fourth vertical tube 24a respectively. The pull straps 82a limit the rotation angle of the retaining frame 81a, preventing it from contacting the ground after rotating at a large angle. Preferably, the maximum rotation angle of the retaining frame 81a is 90°.

[0098] Specifically, two forks 83a and two limiting shafts 84a are spaced apart on the third horizontal tube 33a of the rear frame 12a. Each fork 83a is roughly U-shaped. The two ends of the stop frame 81a are connected to the forks 83a through rotating blocks 85a. The rotating blocks 85a are provided with elongated shaft holes 86a. The limiting shafts 84a pass through the shaft holes 86a and are fixedly connected to the two sides of the forks 83a respectively. The rotation of the stop frame 81a is achieved by rotating the rotating blocks 85a relative to the forks 83a.

[0099] Further, please refer to Figure 26The rotating block 85a has a straight section 87a and an arc-shaped section 88a. When the stop frame 81a is in the closed state, the straight section 87a contacts the fork 83a. At this time, the fork 83a can limit the rotation of the rotating block 85a and prevent the stop frame 81a from rotating. When it is necessary to rotate the stop frame 81a, simply lift the stop frame 81a upwards so that the arc-shaped section 88a engages with the fork 83a, thus realizing the rotation of the stop frame. In this embodiment, only the straight section 87a is needed to limit the rotation of the stop frame 81a. The structure is simple, easy to operate, and has a low cost.

[0100] In the above embodiments, the descriptions of each embodiment have different focuses. Parts not described in detail in a particular embodiment can be referred to in the relevant descriptions of other embodiments. In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0101] The trolley provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A quick-release structure for connecting the wheels of a trolley to a frame, the frame including a riser, the wheels being rotatably mounted on a wheel frame, characterized in that, The quick-release structure includes a bushing, a locking element, an elastic element, and a shaft. The riser, the bushing, and the shaft are sequentially sleeved from top to bottom. One end of the shaft is fixed to the wheel frame, and the other end of the shaft has a groove. The bushing has a first through hole on its peripheral wall, and the riser has a second through hole on its peripheral wall corresponding to the first through hole. The lock has a protrusion and a hook. The protrusion passes through one end of the first through hole and extends out of the second through hole. The elastic element extends out of the other end of the first through hole and abuts against the inner wall of the riser. The hook is adapted to engage with the slot.

2. The quick-release structure according to claim 1, characterized in that, The locking member has a mounting groove at one end facing away from the protrusion. One end of the elastic member extends into the mounting groove and abuts against the bottom wall of the mounting groove. The other end of the elastic member abuts against the inner wall of the riser.

3. The quick-release structure according to claim 1, characterized in that, The axle has a tapered head at one end away from the wheel frame, and the head and the wheel frame define the slot; the hook has a guide slope on the side facing the wheel frame, and the guide slope is used to cooperate with the head.

4. The quick-release structure according to claim 1, characterized in that, The lock is provided with sliding grooves on both sides, and sliding rails are provided on both sides of the inner wall of the first through hole. The sliding rails are slidably disposed in the corresponding sliding grooves.

5. The quick-release structure according to claim 4, characterized in that, The groove is a concave V-shaped groove, and the rail is a convex V-shaped rail.

6. The quick-release structure according to claim 1, characterized in that, The outer peripheral wall of the wheel frame is square, and the inner wall of the bushing is provided with a square hole that matches the wheel frame. The wheel frame is installed in the square hole.

7. A trolley, characterized in that, The device includes a frame, wheels, and a quick-release structure as described in claims 1-6. The frame includes multiple risers, and the wheels are arranged in a one-to-one correspondence with the risers. The wheels are rotatably mounted on a wheel frame, and the wheel frame is connected to the risers through the quick-release structure.

8. The trolley according to claim 7, characterized in that, The trolley includes a canopy and multiple uprights fixedly connected to the canopy. The multiple uprights are connected one-to-one with the ends of the multiple vertical tubes away from the wheels, so that the canopy can cover the frame.

9. The trolley according to claim 7, characterized in that, The trolley also includes a pull rod connected to the frame. The pull rod includes a handle, a mounting base, a vertical rod, a first side rod, and a second side rod. One end of the vertical rod is connected to the handle, and the other end of the vertical rod extends into the mounting base and can slide up and down relative to the mounting base. The first side rod and the second side rod are symmetrically arranged on both sides of the mounting base, and both the first side rod and the second side rod are hinged to the mounting base.

10. The trolley according to claim 7, characterized in that, The frame is square in shape and includes a front frame, a left frame, a rear frame, a right frame, and a bottom frame that are connected to each other. The rear frame is rotatably connected to the bottom frame.

Images