Folded-in-half type folding bicycle

Abstract

The utility model provides a folding type folding bicycle which comprises a bottom frame (6), a front frame (2), a rear frame (3), a left side frame (4) and a right side frame (5), when the folding bicycle is folded, the middle of the bottom frame (6) is pulled upwards to enable a front frame part (11) and a rear frame part (12) to be folded oppositely, a left matching structure (21) moves upwards from the lower end along a left guide structure (20), and a right matching structure (24) moves upwards from the lower end along a right guide structure (23); the front frame (2) and the rear frame (3) draw close to each other to link the parallelograms of the left side frame (4) and the right side frame (5) to draw close synchronously so as to lift the middle support, so that the front frame (2), the rear frame (3), the left side frame (4), the right side frame (5), the front frame part (11) and the rear frame part (12) draw close to each other and finally form a folded state, and the front frame part (11), the rear frame part (12) and the connecting seats can form a U-shaped storage space (16) with a downward opening; the volume can be reduced, and the capacity can be as large as possible.

Description

Technical Field

[0001] This utility model relates to the field of folding bicycle technology, specifically a bi-folding folding bicycle. Background Technology

[0002] With the rise of outdoor leisure activities, the demand for outdoor products is also increasing. One such product is the folding bike. Essentially, a folding bike is a cargo vehicle that can be folded and stored. Its primary function is to carry goods, but it can also be folded down to reduce its size for easy storage. When unfolded, a typical folding bike is a cuboid. It includes a front frame, rear frame, left side frame, right side frame, and base frame. The front, rear, left, and right side frames form the four sides of the folding bike, and these four sides, along with the base frame, create a cuboid cargo space. When wheels are installed, the folding bike can be moved using them.

[0003] As can be seen from the above, the structure of a folding bike needs to be designed to be foldable, and the design requirements of the front frame, rear frame, left side frame, right side frame and base frame when folded need to be considered. The structure has a certain degree of complexity. Therefore, how to design the folding mechanism and control the volume after folding becomes a challenge. Although existing technologies have proposed many folding design solutions, 1) how to make the volume smaller and 2) how to make the capacity as large as possible while keeping the volume small present greater innovation challenges. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a folding bicycle that is advantageous in terms of minimizing size while maximizing capacity.

[0005] To solve the above-mentioned technical problems, this utility model proposes a folding bicycle, including wheels and a foldable frame. The wheels and the frame adopt a detachable or non-detachable structure. The frame includes a base frame, a front frame disposed on the front side of the base frame, a rear frame disposed on the rear side of the base frame, and side frames disposed on both sides of the base frame, namely the left side frame and the right side frame.

[0006] Both the front and rear frames adopt a U-shaped frame, with the left and right side bars of the front frame and the left and right side bars of the rear frame serving as the four corner posts of the frame.

[0007] The base frame includes a front frame, a rear frame, and two symmetrically arranged connecting seats. Outer and inner crossbeams are provided between the left and right side members of the front frame, and between the left and right side members of the rear frame. The front end of the left side member of the front frame is hinged to the lower fixing seat at the bottom of the left corner column of the front frame. The rear end of the left side member of the front frame is hinged to the front end of the left connecting seat. The rear end of the left connecting seat is hinged to the front end of the left side member of the rear frame. The rear end of the left side member of the rear frame is hinged to the lower fixing seat at the bottom of the left corner column of the rear frame. The front end of the right side member of the front frame is hinged to the lower fixing seat at the bottom of the left corner column of the rear frame. The lower fixed seat at the bottom of the right corner column is hinged, the rear end of the right rod of the front frame is hinged to the front end of the right connecting seat, the rear end of the right connecting seat is hinged to the front end of the right rod of the rear frame, and the rear end of the right rod of the rear frame is hinged to the lower fixed seat at the bottom of the right corner column of the rear frame; thus forming a double-folding base frame; when the middle of the base frame is lifted upwards for storage and folding, the front frame, the rear frame and each connecting seat can form a U-shaped storage space with the opening facing downwards, and at the same time the front frame and the rear frame move inwards synchronously and move closer to each other, and the front frame, the front frame, the rear frame and the rear frame are arranged in a parallel state from front to back.

[0008] A left frame is provided on the outer left side of the base frame, and a right frame is provided on the outer right side of the base frame. Both the left and right frames include two parallelograms on the same side. The two adjacent inner ends of the two parallelograms are hinged together by a central support. The outer ends of the two parallelograms are respectively hinged to the front and rear frames by the lower fixed seats. The left central support corresponds to the left frame, and the right central support corresponds to the right frame. A rigid left suspension device is provided between the left central support and the left connecting seat, with the upper end of the left suspension device fixed to the left central support. The left lifting device is vertically provided with a left guide structure. The middle part of the left connecting seat is provided with a left mating structure that guides and cooperates with the left guide structure. The left guide structure also limits the left mating structure to form a first limit. A rigid right lifting device is provided between the middle part of the right middle support and the right connecting seat. The upper end of the right lifting device is fixed on the right middle support. The right lifting device is vertically provided with a right guide structure. The middle part of the right connecting seat is provided with a right mating structure that guides and cooperates with the right guide structure. The right guide structure also limits the right mating structure to form a second limit.

[0009] When the left and right side frames are in the unfolded state, the two parallelograms are arranged in a figure-eight shape. The left mating structure moves to the lower stop of the left guide structure to form the first limit, and the right mating structure moves to the lower stop of the right guide structure to form the second limit. This makes the front frame, connecting seat, and rear frame form a flat base. At the same time, the left and right lifting devices suspend the base through the left and right connecting seats and finally form the unfolded state.

[0010] When the frame is being folded back into its original position, the middle of the base frame is pulled upwards, causing the front and rear frames to fold relative to each other. Meanwhile, the left mating structure moves upwards from the bottom along the left guide structure, and the right mating structure moves upwards from the bottom along the right guide structure. At the same time, the front and rear frames move together to bring the front and rear frames closer together. The movement of the front and rear frames together also causes the parallelograms of the left and right frames to move together synchronously to raise the center support. This results in the front frame, rear frame, left frame, right frame, front frame, and rear frame moving together and ultimately forming a folded state.

[0011] As an improvement, the left lifting device is plate-shaped or rod-shaped, and the left lifting device is vertically provided with a left guide groove or a left guide rod. The left connecting seat is provided with a left guide post or a left guide sleeve in the middle. The left guide post or left guide sleeve is slidably engaged with the left guide groove or left guide rod. The right lifting device is plate-shaped or rod-shaped, and the right lifting device is vertically provided with a right guide groove or a right guide rod. The right connecting seat is provided with a right guide post or a right guide sleeve in the middle. The right guide post or right guide sleeve is slidably engaged with the right guide groove or right guide rod.

[0012] As an improvement, wheels are detachably connected to the lower parts of the front frame, rear frame, and / or the lower ends of the four corner posts. When storage is required, the detached wheels can be stored in the U-shaped storage space.

[0013] As an improvement, the lower crossbeam of the front frame is equipped with a connecting column, which is detachably connected to a wheel, and the lower ends of the two rear corner uprights are each detachably connected to a wheel; or the lower crossbeam of the rear frame is equipped with a connecting column, which is detachably connected to a wheel, and the lower ends of the two front corner uprights are each detachably connected to a wheel; or both the lower crossbeams of the front and rear frames are equipped with connecting columns, which are detachably connected to wheels; or the lower ends of the four corner uprights are each detachably connected to a wheel.

[0014] As an improvement, the connecting column is fixedly installed at the lower part of the lower crossbeam, or at the front part of the lower crossbeam, or at the rear part of the lower crossbeam, or at an intersection with the lower crossbeam, and the lower end of the connecting column is flush with the lower ends of the two corner columns.

[0015] As an improvement, the connecting columns and the four corner columns all use outer sleeves, and the cross-section of the outer sleeve is a tubular body that is circular, polygonal, D-shaped, elliptical, or flat elliptical.

[0016] As an improvement, both the left and right center supports are equipped with a transmission structure. This transmission structure connects to any adjacent end of the two parallelograms. When one parallelogram moves, the transmission structure synchronously drives the other parallelogram to move. The direction of movement is as follows: when one parallelogram moves outward, the other parallelogram also moves outward, so that the two parallelograms move away from each other to achieve the unfolded state; when one parallelogram moves inward, the other parallelogram also moves inward, so that the two parallelograms move closer to each other to achieve the folded state.

[0017] As an improvement, both the left and right connecting seats adopt a downward-facing groove-shaped component with an inverted U-shaped cross-section. Both ends of the groove-shaped component are provided with limiting parts. When the base frame is unfolded, the limiting parts limit the upper sides of the left and right side rods of the front frame and the left and right side rods of the rear frame in the downward direction. Alternatively, both the left and right connecting seats adopt a downward-facing groove-shaped component with an inverted U-shaped cross-section. Both ends of the groove-shaped component are hinged to connectors. The connectors are fixedly connected to the corresponding side rods one by one. The connectors are also provided with limiting ends above the hinge shaft. When the base frame is unfolded, the two ends of the connecting seats limit the left and right side rods of the front frame and the left and right side rods of the rear frame in the horizontal direction through the limiting ends of the connectors.

[0018] As an improvement, a connecting rod is provided between the middle of the left connecting seat and the right connecting seat. The connecting rod connects the left connecting seat and the right connecting seat laterally. When the connecting rod is pulled upward, the left connecting seat and the right connecting seat are moved upward at the same time through the connecting rod so that the front frame and the rear frame fold together.

[0019] As an improvement, the Velcro strap on the bottom of the folding bike's pocket binds the inner crossbeams on the front and rear frames together, or a connecting rod is fixed horizontally between the left and right connecting seats, with the Velcro strap connecting to the connecting rod; a pull strap is set in the middle of the bottom inner side of the pocket, and when the pull strap is pulled upward, the pocket will drive the left and right connecting seats to move upward so that the front and rear frames fold together.

[0020] As an improvement, a handle is also included, which the user uses to move the bi-folding folding cart. When the front frame, front frame, rear frame and rear frame are arranged in a closed state from front to back, a receiving recess is formed between the front frame and the front frame with the front frame as the opening and the front frame as the bottom, and / or a receiving recess is formed between the rear frame and the rear frame with the rear frame as the opening and the rear frame as the bottom. The receiving recess can accommodate the handle for storage.

[0021] As an improvement, wheels are provided on the lower part of the front frame, the rear frame and / or the lower ends of the four corner pillars. When folded, the wheels are brought together in the front-to-back direction, and when unfolded, the wheels are spread out in the front-to-back direction.

[0022] As an improvement, the wheels consist of four wheels, arranged in the following ways: two swivel wheels on the front and two fixed wheels on the rear; or two swivel wheels on the rear and two fixed wheels on the front; or two swivel wheels on the front and two swivel wheels on the rear.

[0023] Compared with the prior art, the present invention has the following advantages after adopting the above structure: Through structural design, the present invention enables the front frame, rear frame and each connecting seat to form a U-shaped storage space with the opening facing downward when the middle of the base frame is lifted upward for storage and folding. At the same time, the front frame and rear frame move inward and move closer to each other in sync. The front frame, front frame, rear frame and rear frame are arranged in a parallel state from front to back. Furthermore, a left frame is provided on the outer left side of the base frame and a right frame is provided on the outer right side of the base frame. Both the left frame and the right frame include two parallelograms. Therefore, it is beneficial to make the volume smaller when folded and maximize the capacity when unfolded.

[0024] The U-shaped storage space can store the accessories of the folding bike. In this way, the accessories are hidden in the U-shaped storage space, which further reduces the logistics volume and logistics costs.

[0025] In particular, the following structure is organically integrated into the overall technical solution: a rigid left suspension device is provided between the middle of the left center support and the left connecting seat. The upper end of the left suspension device is fixed to the left center support. The left suspension device is vertically provided with a left guide structure. The middle of the left connecting seat is provided with a left mating structure that guides and cooperates with the left guide structure. The left guide structure also provides a lower limit to the left mating structure to form a first limit. A rigid right suspension device is provided between the middle of the right center support and the right connecting seat. The upper end of the right suspension device is fixed to the right center support. The right suspension device is vertically provided with a right guide structure. The middle of the right connecting seat is provided with a right mating structure that guides and cooperates with the right guide structure. The right guide structure also provides a lower limit to the right mating structure to form a second limit.

[0026] The design of the rigid left suspension device, left mating structure, rigid right suspension device, and right mating structure guide mating structure has the following advantages: 1) It also has the function of synchronous up and down sliding of the adjacent ends of the front frame and the rear frame; 2) It avoids the phenomenon of front and rear frame swaying and up and down asynchrony during folding and unfolding; 3) It is conducive to the smoothness of frame folding and unfolding.

[0027] The reason is that the left lifting device is set as rigid, with its upper end fixed to the left middle support. The left lifting device has a vertical left guide structure, and the middle part of the left connecting seat is set to guide and cooperate with the left guide structure. The right lifting device is set as rigid, with its upper end fixed to the right middle support. The right lifting device has a vertical right guide structure, and the middle part of the right connecting seat is set to guide and cooperate with the right guide structure. The adjacent ends of the front frame and the rear frame move up and down along the lifting device, thus restricting the front frame and the rear frame from excessively swinging back and forth or up and down. This ensures that it always moves upward along the center line, which is much smoother. Without the "middle part of the left connecting seat is set to guide and cooperate with the left guide structure" and "middle part of the right connecting seat is set to guide and cooperate with the right guide structure", when the base frame is pulled upward during folding or when the base frame slides downward during unfolding, the front frame and the rear frame will wobble back and forth and move up and down asynchronously. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of the front view of a folding bicycle in the folded state.

[0029] Figure 2 This is a three-dimensional schematic diagram of the rear view of a folding bicycle in the folded state.

[0030] Figure 3 This is a front side view of a folding bicycle in its folded state.

[0031] Figure 4 This is a top view of a folding bicycle disclosed herein.

[0032] Figure 5 This is a three-dimensional schematic diagram of a folding bicycle in its unfolded state.

[0033] Figure 6 This is a left-side view of a folding bicycle in its unfolded state.

[0034] Figure 7 This is a top view of a folding bicycle in its unfolded state.

[0035] Figure 8 This is a sectional view along axis AA.

[0036] Figure 9 This is a three-dimensional schematic diagram of a folding bicycle disclosed herein, in its unfolded state after the cloth bag is installed, viewed from the left side.

[0037] Figure 10 This is a three-dimensional schematic diagram from the top view of a folding bicycle in its unfolded state after the cloth bag is installed, according to the present disclosure.

[0038] Figure 11 This is a three-dimensional schematic diagram of a folding bicycle disclosed herein, in its unfolded state after the cloth bag is installed, viewed from a lower side.

[0039] Figure 12 This is a three-dimensional front view of the folding frame of a folding bicycle disclosed herein in the folded state.

[0040] Figure 13 To be Figure 12 A three-dimensional schematic diagram showing the explosion of the left-middle support.

[0041] Figure 14 This is a left-side view of the folding frame of a bi-folding bicycle disclosed herein in the folded state.

[0042] Figure 15 This is a top view of a folding bicycle with a connecting rod on the base frame in its unfolded state.

[0043] Figure 16 This is a three-dimensional schematic diagram of the base frame of a folding bicycle disclosed herein in its unfolded state.

[0044] Figure 17 This is a three-dimensional schematic diagram of the base frame of a folding bicycle in the folded state.

[0045] Figure 18 This is a left-side view of a folding frame of a bi-folding bicycle with a connector structure disclosed herein.

[0046] Figure 19 This is an enlarged 3D schematic diagram of A.

[0047] As shown in the diagram: 1. Wheel, 2. Front frame, 3. Rear frame, 4. Left side frame, 5. Right side frame, 6. Base frame, 7. Left side rod, 8. Right side rod, 9. Outer crossbeam, 10. Inner crossbeam, 11. Front frame, 12. Rear frame, 13. Lower fixed seat, 14. Left connecting seat, 15. Right connecting seat, 16. U-shaped storage space, 17. Left middle support, 18. Right middle support, 19. Left lifting device, 20. Left guide structure, 21. Left mating structure, 22. Right lifting device, 23. Right guide structure, 24. Right mating structure, 25. Connecting column, 26. Lower crossbeam, 27. Limiting part, 28. Connector head, 29. Limiting end, 30. Connecting rod, 31. Cloth bag, 32. Cable tie, 33. Middle support rod, 34. Pull strap, 35. Handle, 36. Transmission gear, 37. Corner column. Detailed Implementation

[0048] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0049] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0050] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0051] like Figures 1 to 19 The present invention discloses a folding bicycle, which includes wheels 1 and a foldable frame. The wheels 1 and the frame are connected by a detachable or non-detachable structure. The frame includes a base frame 6, a front frame 2 located in front of the base frame 6, a rear frame 3 located behind the base frame 6, and side frames located on both sides of the base frame 6. The two side frames are a left side frame 4 and a right side frame 5.

[0052] Among them, such as Figure 1 , 2 As shown in Figure 5, both the front frame 2 and the rear frame 3 adopt a U-shaped frame, and the left and right side rods of the front frame 2 and the left and right side rods of the rear frame 3 serve as the four corner posts 37 of the frame.

[0053] Each corner post 37 has a lower fixing seat 13 at its lower end. The front frame 2 and the rear frame 3 are connected to the base frame 6 through the lower fixing seat 13. Specifically: Figure 5 , 11As shown, the base frame 6 includes a front frame 11, a rear frame 12, and two symmetrically arranged connecting seats, namely a left connecting seat 14 and a right connecting seat 15. Outer crossbeams 9 and inner crossbeams 10 are provided between the left and right side members 7 and 8 of the front frame 11, and between the left and right side members 7 and 8 of the rear frame 12. The front end of the left side member 7 of the front frame 11 is hinged to the lower fixing seat 13 of the front frame 2, which is fixedly located at the lower end of the left corner column 37. The rear end of the left side member 7 of the front frame 11 is hinged to the front end of the left connecting seat 14. The rear end of the left connecting seat 14 is hinged to the left side member 7 of the rear frame 12. The front end is hinged, and the rear end of the left side rod 7 of the rear frame 12 is hinged to the lower fixing seat 13 fixed at the lower end of the left corner column 37 of the rear frame 3; the front end of the right side rod 8 of the front frame 11 is hinged to the lower fixing seat 13 fixed at the lower end of the right corner column 37 of the front frame 2; the rear end of the right side rod 8 of the front frame 11 is hinged to the front end of the right connecting seat 15; the rear end of the right connecting seat 15 is hinged to the front end of the right side rod 8 of the rear frame 12; and the rear end of the right side rod 8 of the rear frame 12 is hinged to the lower fixing seat 13 fixed at the lower end of the right corner column 37 of the rear frame 3; thus forming a double-folding base frame 6.

[0054] In this example, to increase the support density, such as Figure 16 , 17 As shown, one or more central support rods 33 are provided longitudinally or laterally between the outer crossbeam 9 and the inner crossbeam 10 of the front frame 11 and between the outer crossbeam 9 and the inner crossbeam 10 of the rear frame 12.

[0055] In this example, to improve versatility and reduce manufacturing costs, such as Figure 16 , 17 As shown, the outer crossbeam 9 and the inner crossbeam 10 are set to be of equal length. Furthermore, the front sections of the left side rod 7 and the right side rod 8 of the front frame 11 are both extended outwards, and the rear sections of the left side rod 7 and the right side rod 8 of the rear frame 12 are both extended outwards. In addition, this helps to improve the support and assistance effect of the base frame 6 on the cloth bag 31 and the items.

[0056] like Figure 16 , 17 As shown, the left connecting seat 14 and the right connecting seat 15 are configured to have a certain length. When the middle of the base frame 6 is lifted upwards and folded for storage, the front frame 11, the rear frame 12, and each connecting seat can form a U-shaped storage space 16 with the opening facing downwards. Figure 12 , 14 As shown, the front frame 2 and the rear frame 3 move inward synchronously and move closer to each other, with the front frame 2, front frame 11, rear frame 12, and rear frame 3 arranged in a parallel configuration from front to back. Figure 12 , 14 It is evident that folding and closing the container makes it easier to reduce the size.

[0057] Preferred, such as Figure 1 , 2 As shown in Figures 3, 4, and 5, wheels 1 are detachably connected to the lower parts of the front frame 2, the rear frame 3, and / or the lower ends of the four corner posts 37. When storage is required, the detached wheels 1 can be stored in the U-shaped storage space 16. This solves the storage problem of the wheels 1, eliminating the need for additional volume to accommodate them. This allows for smaller size, significantly reducing packaging and logistics costs, making it ideal for long-distance export markets.

[0058] Of course, wheel 1 can also be set to be non-removable, that is, after it is installed in the factory, it does not need to be disassembled later. For short-distance domestic sales where logistics costs are not a concern or storage volume is not a requirement, it can be set to be non-removable. Then the U-shaped storage space 16 can store instruction manuals, gifts, easily damaged parts and other items.

[0059] A specific design for the non-removable wheels 1 is as follows: the lower part of the front frame 2 and the rear frame 3 and / or the lower ends of the four corner pillars 37 are respectively provided with non-removable wheels 1. When stored and folded, the wheels 1 are brought together in the front-to-back direction, and when unfolded, the wheels 1 are unfolded in the front-to-back direction.

[0060] The wheels 1 can be four in number, arranged in a manner such as two swivel wheels on the front and two fixed wheels on the rear, or two swivel wheels on the rear and two fixed wheels on the front, or two swivel wheels on the front and two swivel wheels on the rear.

[0061] In this example, as Figure 5 As shown, the lower crossbeam 26 of the front frame 2 is provided with a connecting column 25, which is detachably connected to two wheels 1. The lower ends of the two rear corner pillars 37 are detachably connected to one wheel 1 respectively.

[0062] In this disclosure, such as Figure 1 , 2 As shown in Figures 3, 4, and 5, the device also includes a handle 35. The user moves the folding cart using the handle 35. When the front frame 2, front frame 11, rear frame 12, and rear frame 3 are arranged in a closed configuration from front to back, a receiving recess is formed between the front frame 2 and the front frame 11, with the front frame 2 as the opening and the front frame 11 as the bottom, and / or a receiving recess is formed between the rear frame 3 and the rear frame 12, with the rear frame 3 as the opening and the rear frame 12 as the bottom. The receiving recess can accommodate the handle 35 for storage. In this case, the thickness of the handle 35 is preferably equal to or less than the depth of the receiving recess; however, it can also be appropriately greater than the depth of the receiving recess.

[0063] After manufacturing is completed, there are two options for the logistics and sales process: First, the cloth bag 31 is pre-installed at the factory; second, the user installs the cloth bag 31 themselves after receiving the vehicle. In the first option, since the cloth bag 31 can also be folded along with the frame, it can still form a [structure / structure]. Figure 1 , 2 The frame shown in figures 3 and 4 has a cloth bag 31, but the cloth bag 31 is folded; in the second case, as... Figure 1 , 2 The folding carts shown in pictures 3 and 4 are packed into a cardboard box, and it is visible that... Figure 1 , 2 As shown in Figures 3 and 4, the bicycle includes a folding frame, wheels 1, and handles 35. When folded, these components form a small cuboid. The entire cuboid frame is packed into a cardboard box, and the cloth bag 31 is preferably housed in the U-shaped storage space 16. After purchase, the user can remove the cuboid frame from the cardboard box, unfold it, and install the cloth bag 31. It is very compact and convenient.

[0064] When implementing the U-shaped storage space 16, in order to achieve interconnected functionality, while aiming for a small volume and maximum capacity, it is also necessary to consider how the left side shelf 4 and the right side shelf 5 can be organically integrated into the overall technical solution to achieve the design objectives. Specifically: the left side shelf 4 is set on the outer left side of the base frame 6, and the right side shelf 5 is set on the outer right side of the base frame 6. Both the left side shelf 4 and the right side shelf 5 include two parallelograms on the same side, such as... Figure 5 , 8 As shown in Figure 13, the two inner ends of two adjacent parallelograms are hinged together by a central support. The outer ends of the two parallelograms are respectively hinged to the front frame 2 and the rear frame 3 by the lower fixed seat 13. The left central support 17 corresponds to the left frame 4, and the right central support 18 corresponds to the right frame 5. A rigid left suspension device 19 is provided between the left central support 17 and the left connecting seat 14. The upper end of the left suspension device 19 is fixed to the left central support 17. The left suspension device 19 is vertically provided with a left guide structure 20. The middle of the left connecting seat 14 is provided with... The left guide structure 20 guides and cooperates with the left cooperation structure 21. The left guide structure 20 also limits the left cooperation structure 21 to form a first limit. A rigid right suspension device 22 is provided between the middle of the right middle support 18 and the right connecting seat 15. The upper end of the right suspension device 22 is fixed on the right middle support 18. The right suspension device 22 is vertically provided with a right guide structure 23. The middle of the right connecting seat 15 is provided with a right cooperation structure 24 that guides and cooperates with the right guide structure 23. The right guide structure 23 also limits the right cooperation structure 24 to form a second limit.

[0065] Therefore, as Figure 5 As shown, when the left side frame 4 and the right side frame 5 are in the unfolded state, the two parallelograms are arranged in a figure-eight shape. Furthermore, the left mating structure 21 moves to the lower stop point of the left guide structure 20 to form a first limit, and the right mating structure 24 moves to the lower stop point of the right guide structure 23 to form a second limit. This results in the front frame 11, the connecting seat, and the rear frame 12 forming a flat base frame 6. At the same time, the left lifting device 19 and the right lifting device 22 suspend the base frame 6 through the left connecting seat 14 and the right connecting seat 15, and finally form the unfolded state.

[0066] When the frame is folded back into its original storage configuration, such as Figure 1 , 12 As shown in Figure 14, pulling the middle of the base frame 6 upward causes the front frame 11 and the rear frame 12 to fold relative to each other. Meanwhile, the left mating structure 21 moves upward from the lower end along the left guide structure 20, and the right mating structure 24 moves upward from the lower end along the right guide structure 23. At the same time, the front frame 11 and the rear frame 12 move the front frame 2 and the rear frame 3 closer together. The front frame 2 and the rear frame 3 move closer together, which in turn moves the parallelograms of the left side frame 4 and the right side frame 5 to move closer together to lift the middle support. As a result, the front frame 2, the rear frame 3, the left side frame 4, the right side frame 5, the front frame 11, and the rear frame 12 move closer together and finally form a folded state.

[0067] In addition to forming a flat base frame 6 with reliable support, the first and second limit switches are also used to enhance the load-bearing capacity of the base frame 6.

[0068] In this disclosure, in order to maximize the capacity, such as Figure 5 As shown, the front frame 2, rear frame 3, left side frame 4, and right side frame 5 all adopt a single-bar structure that does not overlap vertically. In contrast, Chinese Patent No. CN202310206035.X, entitled "A First Folding Assembly and a Second Folding Assembly of a Folding Trailer", can greatly improve the vertical and horizontal and front-to-back storage space, thereby increasing the cargo capacity.

[0069] In some embodiments, in order to maximize capacity, such as Figure 5 As shown, the left lifting device 19 is plate-shaped, and has a left guide groove vertically. The left guide groove serves as a left guide structure 20. The left connecting seat 14 has a left guide post in the middle, which serves as a left mating structure 21. The left guide post slides in conjunction with the left guide groove. The right lifting device 22 is also plate-shaped, and has a right guide groove vertically. The right guide groove serves as a right guide structure 23. The right connecting seat 15 has a right guide post in the middle, which serves as a right mating structure 24. The right guide post or right guide sleeve slides in conjunction with the right guide groove or right guide rod.

[0070] Of course, other structures are also possible. For example, the left lifting device 19 is rod-shaped, and the left lifting device 19 is vertically provided with a left guide groove, which serves as a left guide structure 20. The left connecting seat 14 is provided with a left guide post in the middle, which serves as a left mating structure 21. The left guide post slides in conjunction with the left guide groove. The right lifting device 22 is also plate-shaped, and the right lifting device 22 is vertically provided with a right guide groove, which serves as a right guide structure 23. The right connecting seat 15 is provided with a right guide post in the middle, which serves as a right mating structure 24. The right guide post or right guide sleeve slides in conjunction with the right guide groove or right guide rod.

[0071] Other structures are also possible. For example, the left lifting device 19 is rod-shaped, with a left guide rod vertically arranged in the left lifting device 19, serving as a left guide structure 20. A left guide sleeve is provided in the middle of the left connecting seat 14, serving as a left mating structure 21. The left guide rod and the left guide sleeve are in sliding fit. The right lifting device 22 is also rod-shaped, with a right guide rod vertically arranged in the right lifting device 22, serving as a right guide structure 23. A right guide sleeve is provided in the middle of the right connecting seat 15, serving as a right mating structure 24. The right guide rod and the right guide sleeve are in sliding fit.

[0072] In addition to the above-mentioned guidance structure, other guidance structures are also possible. Any guidance structure applicable to this disclosure can be applied to this disclosure, and examples will not be given here.

[0073] In some embodiments, to facilitate smaller submissions, such as Figure 1 , 5 As shown in Figure 12, the connecting column 25 is fixedly installed on the lower part of the lower crossbeam 26 between the two corner columns 37 of the front frame 2, and the lower end of the connecting column 25 is flush with the lower end of the two corner columns 37.

[0074] Of course, other structures are also possible, such as the connecting column 25 being fixedly installed at the front of the lower crossbeam 26 between the two corner columns 37 of the front frame 2, or at the rear of the lower crossbeam 26, or being fixedly installed at an intersection with the lower crossbeam 26, and the lower end of the connecting column 25 being flush with the lower ends of the two corner columns 37.

[0075] In some embodiments, such as Figure 1 , 5 As shown in Figures 1 and 12, the connecting column 25 and the four corner columns 37 all use outer sleeves, and the cross-section of the outer sleeve is a tubular body that is circular, polygonal, D-shaped, elliptical, or flat elliptical.

[0076] In some embodiments, to further facilitate the folding and unfolding process, and to improve smoothness and controllability, such as Figure 8 , 13As shown, both the left center support 17 and the right center support 18 are equipped with a transmission structure. This transmission structure is connected to any adjacent end of the two parallelograms. When one of the parallelograms moves, the transmission structure synchronously drives the other parallelogram to move. The direction of movement is as follows: when one parallelogram moves outward, the other parallelogram also moves outward, so that the two parallelograms move away from each other to achieve the unfolded state; when one parallelogram moves inward, the other parallelogram also moves inward, so that the two parallelograms move closer to each other to achieve the folded state.

[0077] In this example, as Figure 8 , 13 As shown, the transmission structure includes a transmission gear 36, which is used for linkage and synchronization.

[0078] Of course, other structures are also possible, such as linkage transmission. Any guiding and linkage structure applicable to this disclosure can be applied to this disclosure. For example, the guiding and linkage structure described in the patent with patent number ZL 202320507408.2 entitled "A Folding Frame and Folding Vehicle" is within its protection scope. No further examples will be given here.

[0079] In some embodiments, to provide support and positioning, so that the base frame 6 achieves a better flat state when unfolded, such as... Figure 5 , 16 As shown in Figure 17, both the left connecting seat 14 and the right connecting seat 15 are groove-shaped parts with an inverted U-shaped cross-section and downward opening. Both ends of the groove-shaped parts are provided with limiting parts 27. When the base frame 6 is unfolded, the limiting parts 27 limit the upper sides of the left and right side rods of the front frame 11 and the left and right side rods of the rear frame 12 in the downward direction.

[0080] Of course, there can be other structures, such as... Figure 18 , 19 As shown, both the left connecting seat 14 and the right connecting seat 15 are groove-shaped parts with an inverted U-shaped cross-section and downward opening. Both ends of these groove-shaped parts are hinged to connecting heads 28, which are fixedly connected to their corresponding side rods. This fixed connection can be achieved by riveting, screwing, or welding. The connecting head 28 also has a limiting end 29 above the hinge axis. When the base frame 6 is in the unfolded state, the two ends of the connecting seats, in the horizontal direction, limit the left and right side rods of the front frame 11 and the rear frame 12 through the limiting end 29 of the connecting head 28. This provides better support and positioning, which helps to improve the support strength of the base frame 6.

[0081] In some embodiments, to increase the support and smooth movement of the left connecting seat 14 and the right connecting seat 15 during folding, such as Figure 15As shown, a connecting rod 30 is provided between the middle of the left connecting seat 14 and the right connecting seat 15. The connecting rod 30 connects the left connecting seat 14 and the right connecting seat 15 laterally. When the connecting rod 30 is pulled upward, the left connecting seat 14 and the right connecting seat 15 are moved upward through the connecting rod 30 to make the front frame 11 and the rear frame 12 fold together.

[0082] Of course, there are other structures as well, such as... Figure 10 , 11 As shown, the cloth bag 31 of the folding bike connects the left connecting seat 14 and the right connecting seat 15 laterally. The cloth bag 31 is provided with a pull strap 34. When the pull strap 34 is pulled upward, the cloth bag 31 simultaneously drives the left connecting seat 14 and the right connecting seat 15 to move upward, so that the front frame 11 and the rear frame 12 fold together.

[0083] Furthermore, the Velcro straps 32 on the bottom of the folding bike's pocket 31 bind the inner crossbeams 10 on the inner sides of the front frame 11 and the rear frame 12 together, or a connecting rod 30 is fixed laterally between the left connecting seat 14 and the right connecting seat 15, with the Velcro straps 32 connected to the connecting rod 30; a pull strap 34 is provided in the middle of the bottom inner side of the pocket 31. When the pull strap 34 is pulled upwards, the pocket 31 will cause the left connecting seat 14 and the right connecting seat 15 to move upwards, so that the front frame 11 and the rear frame 12 fold together. In this way, assembly is very convenient and manufacturing costs are low.

[0084] As described above, the technical solution disclosed herein proposes a bi-folding folding cart, which is beneficial for minimizing size while maximizing capacity. For example, during the manufacturing of a specific product, the length of each component can be determined through size matching optimization, resulting in a neat and orderly folded cart after folding. Figure 1 , 2 The rectangular frame shown in Figures 3 and 4, when unfolded, can be obtained as follows: Figure 5 The unfolded state shown, or with the cloth bag 31 installed, can be obtained as follows: Figure 9 , 10 In the unfolded state shown in Figure 11, the cloth bag 31 is located in the rectangular container frame formed by the front frame 2, rear frame 3, left side frame 4, right side frame 5, and base frame 6.

[0085] When understanding this utility model, the above structure may be referred to other embodiments / appendices if necessary. Figure 1 And that's understood, so I won't go into details here.

[0086] The above description is only an optional specific embodiment of this utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of this utility model patent application are included in the scope of this utility model patent application.

Claims

1. A folding bicycle, comprising wheels (1) and a foldable frame, wherein the wheels (1) and the frame are connected by a detachable or non-detachable structure, the frame comprising a base frame (6), a front frame (2) disposed on the front side of the base frame (6), a rear frame (3) disposed on the rear side of the base frame (6), and side frames disposed on both sides of the base frame (6), the two side frames being a left side frame (4) and a right side frame (5), characterized in that, Both the front frame (2) and the rear frame (3) adopt a U-shaped frame. The left and right side rods of the front frame (2) and the left and right side rods of the rear frame (3) serve as the four corner posts (37) of the frame. The base frame (6) includes a front frame (11), a rear frame (12), and two connecting seats arranged symmetrically on the left and right sides. Outer crossbeams (9) and inner crossbeams (10) are provided between the left and right side rods (7) and (8) of the front frame (11) and between the left and right side rods (8) of the rear frame (12). The front end of the left side rod (7) of the front frame (11) is fixed to the front frame (2) at the left corner post (37). The lower fixed seat (13) at the lower end of the front frame (11) is hinged to the rear end of the left side rod (7) and the front end of the left connecting seat (14). The rear end of the left connecting seat (14) is hinged to the front end of the left side rod (7) of the rear frame (12). The rear end of the left side rod (7) of the rear frame (12) is hinged to the lower fixed seat (13) at the lower end of the left corner column (37) of the rear frame (3). The front end of the right side rod (8) of the front frame (11) is hinged to the front... The frame (2) is fixedly mounted on the lower fixing seat (13) at the lower end of the right corner column (37), the rear end of the right side rod (8) of the front frame (11) is hinged to the front end of the right connecting seat (15), the rear end of the right connecting seat (15) is hinged to the front end of the right side rod (8) of the rear frame (12), and the rear end of the right side rod (8) of the rear frame (12) is hinged to the lower fixing seat (13) at the lower end of the right corner column (37) of the rear frame (3). This forms a double-folding base frame (6); when the base frame (6) is lifted upwards and folded up, the front frame (11), the rear frame (12) and each connecting seat can form a U-shaped storage space (16) with the opening facing downwards. At the same time, the front frame (2) and the rear frame (3) move inwards in sync and move closer to each other. The front frame (2), the front frame (11), the rear frame (12) and the rear frame (3) are arranged in a parallel state from front to back. A left frame (4) is provided on the outer left side of the base frame (6), and a right frame (5) is provided on the outer right side of the base frame (6). Both the left frame (4) and the right frame (5) include two parallelograms. On the same side, the two inner ends of the two parallelograms are hinged together by a middle support. The outer ends of the two parallelograms are respectively hinged to the front frame (2) and the rear frame (3) by the lower fixed seat (13). The left middle support (17) corresponds to the left frame (4), and the right middle support (18) corresponds to the right frame (5). A rigid left suspension device (19) is provided between the middle of the left middle support (17) and the left connecting seat (14). The upper end of the left suspension device (19) is fixed on the left middle support (17). (19) A left guide structure (20) is provided vertically. A left mating structure (21) is provided in the middle of the left connecting seat (14) to guide and cooperate with the left guide structure (20). The left guide structure (20) also limits the left mating structure (21) to form a first limit. A rigid right lifting device (22) is provided between the middle of the right middle support (18) and the right connecting seat (15). The upper end of the right lifting device (22) is fixed on the right middle support (18). The right lifting device (22) is provided vertically with a right guide structure (23). A right mating structure (24) is provided in the middle of the right connecting seat (15) to guide and cooperate with the right guide structure (23). The right guide structure (23) also limits the right mating structure (24) to form a second limit. When the left side frame (4) and right side frame (5) are in the unfolded state, the two parallelograms are arranged in a figure-eight shape. The left mating structure (21) moves to the lower stop of the left guide structure (20) to form the first limit, and the right mating structure (24) moves to the lower stop of the right guide structure (23) to form the second limit. This makes the front frame (11), connecting seat, and rear frame (12) form a flat base frame (6). At the same time, the left lifting device (19) and right lifting device (22) suspend the base frame (6) through the left connecting seat (14) and right connecting seat (15) and finally form the unfolded state. When the frame is retracted and folded, the middle of the base frame (6) is pulled upwards, causing the front frame (11) and rear frame (12) to fold relative to each other. The left mating structure (21) moves upwards from the bottom along the left guide structure (20), and the right mating structure (24) moves upwards from the bottom along the right guide structure (23). At the same time, the front frame (11) and rear frame (12) move the front frame (2) and rear frame (3) closer together. The front frame (2) and rear frame (3) move closer together, causing the parallelograms of the left frame (4) and right frame (5) to move closer together to raise the center support. Thus, the front frame (2), rear frame (3), left frame (4), right frame (5), front frame (11), and rear frame (12) move closer together and finally form a folded state.

2. The folding bicycle according to claim 1, characterized in that, The left lifting device (19) is plate-shaped or rod-shaped. The left lifting device (19) is vertically provided with a left guide groove or a left guide rod. The left connecting seat (14) is provided with a left guide post or a left guide sleeve in the middle. The left guide post or left guide sleeve is slidably engaged with the left guide groove or left guide rod. The right lifting device (22) is plate-shaped or rod-shaped. The right lifting device (22) is vertically provided with a right guide groove or a right guide rod. The right connecting seat (15) is provided with a right guide post or a right guide sleeve in the middle. The right guide post or right guide sleeve is slidably engaged with the right guide groove or right guide rod.

3. The folding bicycle according to claim 1, characterized in that, The front frame (2), the rear frame (3) and / or the lower ends of the four corner posts (37) are respectively detachably connected to wheels (1). When storage is required, the removed wheels (1) can be stored in the U-shaped storage space (16).

4. The folding bicycle according to claim 3, characterized in that, The lower crossbeam (26) of the front frame (2) is provided with a connecting column (25), and the connecting column (25) is detachably connected to a wheel (1). The lower ends of the two rear corner columns (37) are each detachably connected to a wheel (1); or the lower crossbeam (26) of the rear frame (3) is provided with a connecting column (25), and the connecting column (25) is detachably connected to a wheel (1). The lower ends of the two front corner columns (37) are each detachably connected to a wheel (1); or the lower crossbeam (26) of the front frame (2) and the lower crossbeam (26) of the rear frame (3) are both provided with a connecting column (25), and the connecting column (25) is detachably connected to a wheel (1); or the lower ends of the four corner columns (37) are each detachably connected to a wheel (1).

5. The folding bicycle according to claim 4, characterized in that, The connecting column (25) is fixedly installed at the lower part of the lower crossbeam (26) between the two corner columns (37), or at the front part of the lower crossbeam (26), or at the rear part of the lower crossbeam (26), or at an intersection with the lower crossbeam (26), and the lower end of the connecting column (25) is flush with the lower end of the two corner columns (37).

6. The folding bicycle according to claim 4 or 5, characterized in that, The connecting column (25) and the four corner columns (37) are all made of outer tubes, and the cross-section of the outer tube is a circular, polygonal, D-shaped, elliptical or flat elliptical tube.

7. The folding bicycle according to claim 1, characterized in that, Both the left middle support (17) and the right middle support (18) are equipped with a transmission structure. The transmission structure is connected to any adjacent end of the two parallelograms respectively. When one of the parallelograms moves, the other parallelogram moves synchronously through the transmission structure. The direction of movement is as follows: when one of the parallelograms moves outward, the other parallelogram also moves outward, so that the two parallelograms move away from each other to achieve the unfolded state; when one of the parallelograms moves inward, the other parallelogram also moves inward, so that the two parallelograms move closer to each other to achieve the stored state.

8. The folding bicycle according to claim 1, characterized in that, Both the left connecting seat (14) and the right connecting seat (15) are made of groove-shaped parts with an inverted U-shaped cross section and an opening facing downwards. Both ends of the groove-shaped parts are provided with limiting parts (27). When the base frame (6) is unfolded, the limiting parts (27) in the downward direction limit the upper sides of the left and right side rods of the front frame (11) and the left and right side rods of the rear frame (12); or both the left connecting seat (14) and the right connecting seat (15) are made of groove-shaped parts with an inverted U-shaped cross section and an opening facing downwards. Both ends of the groove-shaped parts are hinged to connecting heads (28). The connecting heads (28) are fixedly connected to the corresponding side rods one by one. The connecting heads (28) are also provided with limiting ends (29) above the hinge shaft. When the base frame (6) is unfolded, the two ends of the connecting seats in the horizontal direction limit the left and right side rods of the front frame (11) and the left and right side rods of the rear frame (12) through the limiting ends (29) of the connecting heads (28).

9. The folding bicycle according to claim 1 or 8, characterized in that, A connecting rod (30) is provided between the middle of the left connecting seat (14) and the right connecting seat (15). The connecting rod (30) connects the left connecting seat (14) and the right connecting seat (15) laterally. When the connecting rod (30) is pulled upward, the left connecting seat (14) and the right connecting seat (15) are simultaneously moved upward through the connecting rod (30) so that the front frame (11) and the rear frame (12) fold together.

10. The folding bicycle according to claim 1, characterized in that, The Velcro strap (32) on the bottom of the folding bike's cloth bag (31) binds the inner crossbeam (10) on the inner side of the front frame (11) and the rear frame (12) together, or a connecting rod (30) is fixed between the left connecting seat (14) and the right connecting seat (15) laterally, and the Velcro strap (32) is connected to the connecting rod (30); a pull strap (34) is provided in the middle of the bottom inner side of the cloth bag (31). When the pull strap (34) is pulled upward, the cloth bag (31) will drive the left connecting seat (14) and the right connecting seat (15) to move upward so that the front frame (11) and the rear frame (12) fold together.

11. The folding bicycle according to claim 1, characterized in that, It also includes a handle (35), which the user uses to move the folding trolley. When the front frame (2), front frame (11), rear frame (12) and rear frame (3) are arranged in a closed state from front to back, the front frame (2) and the front frame (11) form a receiving recess with the front frame (2) as the opening and the front frame (11) as the bottom, and / or the rear frame (3) and the rear frame (12) form a receiving recess with the rear frame (3) as the opening and the rear frame (12) as the bottom. The receiving recess can accommodate the handle (35) for storage.

12. The folding bicycle according to claim 1, characterized in that, The front frame (2) and rear frame (3) are equipped with wheels (1) at the bottom and / or the bottom of the four corner columns (37) respectively. When folded, the wheels (1) are brought together in the front-to-back direction. When unfolded, the wheels (1) are unfolded in the front-to-back direction.

13. The folding bicycle according to claim 12, characterized in that, The wheels (1) consist of four wheels, arranged in the following ways: two omnidirectional wheels on the front and two directional wheels on the rear; or two omnidirectional wheels on the rear and two directional wheels on the front; or two omnidirectional wheels on the front and two omnidirectional wheels on the rear.

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