Multifunctional folding bicycle

Abstract

The utility model relates to the technical field of bicycles, in particular to a multifunctional folding bicycle. Comprising a bicycle frame, a front fork, a front wheel, a rear fork, a rear wheel, a pedal crank accessory plate assembly, a saddle and a handlebar, the bicycle frame comprises a first section, a vertical pipe and a second section, the first section and the vertical pipe are connected with the front fork, the second section is connected with the rear fork, one end of the first section and one end of the second section can move relatively, and the saddle is installed at one end of the first section and one end of the second section. The other end of the first section, the front fork and the front wheel, and the other end of the second section, the rear fork and the rear wheel can rotate relative to the saddle; the rear wheel, the movable pedal crank accessory assembly, the rear fork, the second telescopic pipe of the second section, the front wheel, the front fork and the second telescopic pipe of the first section are rotated by 90 degrees, the taken-down vertical pipe is inserted into a connecting hole or a clamping groove in the saddle, and the vertical pipe is matched with the folded front wheel, the folded rear wheel and a pulley on the saddle to form a pull rod vehicle or a trailer for use. And functions of the bicycle are increased.

Description

Technical Field

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

[0002] Bicycles are a common mode of transportation. They are propelled by the rider pedaling, which rotates a large sprocket, then a chain drives a small freewheel on the rear axle. Bicycles require no energy and are a completely pollution-free mode of transportation. Folding bicycles consist of a folding frame and a folding stem. By folding the frame, the front and rear wheels are folded together and locked in place using a locking mechanism, reducing weight by 45%.

[0003] With a length of about 100cm, the entire vehicle can be folded and placed in a folding bag or the trunk of a car, making it easy to carry.

[0004] However, with the continuous improvement of people's living standards and the booming development of the tourism industry, portable folding bicycles are increasingly appearing in people's field of vision, becoming a new means of transportation for commuting, holiday leisure, or outings. Currently, most folding bicycles are single-arm folding, still requiring manual handling after folding, have limited load-bearing capacity, and only serve the purpose of riding, resulting in a single functional use. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing a multi-functional folding bicycle that can be unfolded for use as a bicycle and folded for use as a trolley, thus solving the technical problems mentioned in the background section.

[0006] To achieve the above technical objectives, this utility model proposes the following technical solution: a multi-functional folding bicycle, comprising a frame, a front fork, a front wheel, a rear fork, a rear wheel, a pedal crank accessory plate assembly, a seat, and handlebars. The frame includes a first section connecting the front fork and a seat tube, and a second section connecting the rear fork. One end of the first section and one end of the second section are movable relative to each other. The seat is mounted on one end of the first section and one end of the second section. The other end of the first section, as well as the front fork and the front wheel, and the other end of the second section, as well as the rear fork and the rear wheel, are rotatable relative to the seat. A pulley is provided at the rear of the seat. A connecting hole adapted to the seat tube is provided in the middle of the seat. A slot adapted to the seat tube is provided at the end of the seat. A basket is detachably mounted on the seat tube.

[0007] Furthermore, both the first segment and the second segment include a telescopic tube one and a telescopic tube two. The telescopic tube one is fitted onto the telescopic tube two and fixed by a first locking buckle. One end of the telescopic tube one is hinged to a U-shaped frame. The U-shaped frame has a storage hole and a riding hole. Both the storage hole and the riding hole are equipped with pins. The upright is installed on the front fork by a second locking buckle.

[0008] Furthermore, the pedal crank accessory plate assembly includes a chainstay, a sprocket assembly mounted on the chainstay, a crankshaft, and a pedal crank accessory. The sprocket assembly sequentially includes a drive sprocket, a first sprocket, a second sprocket, a third sprocket, a fourth sprocket, and a driven sprocket. The first and second sprockets, the third sprocket, and the fourth sprocket are all mounted on the chainstay via the same shaft. The driven sprocket is mounted on the rear wheel axle. The drive sprocket is connected to the first sprocket via a drive chain. The second and third sprockets are connected via a first chain. The fourth sprocket and the driven sprocket are connected via a second chain. The crankshaft is mounted on the drive sprocket, and the pedal crank accessory is mounted on both ends of the crankshaft.

[0009] Furthermore, each of the two telescopic tubes is provided with an internal threaded sleeve that is compatible with the bolt.

[0010] Furthermore, a hanging rod is provided on one side of the U-shaped frame, and a connecting rod is provided on the top of one side of the basket, with a hook at one end of the connecting rod.

[0011] Furthermore, the rear lower fork is rotatably mounted on the axle of the rear wheel, with a first limiting block fixed to both ends of the axle, and a second limiting block provided on the rear lower fork. The end of the rear lower fork near the drive sprocket is connected to the U-shaped frame and the first segment respectively via gravity ropes.

[0012] Furthermore, the handlebars are equipped with two brake levers, one on the left and one on the right. The front wheel is equipped with a front brake, and the rear wheel is equipped with a rear brake. Both brake levers are connected to the front brake and the rear brake respectively via brake cables. The brake cable connected to the rear brake passes through the riser, the U-shaped frame, the first segment, and the second segment in sequence and is limited by a buckle. Each brake cable consists of two segments, and the steel wire ropes of the two brake cable segments are connected by a steel wire rope buckle connector.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model rotates the rear wheel, the moving pedal crank accessory assembly, the rear fork, the second section of the telescopic tube, the front wheel, the front fork, and the first section of the telescopic tube by 90°, and inserts the removed stem tube into the connecting hole or slot on the seat. Together with the folded front wheel, rear wheel, and pulley on the seat, it forms a trolley or trailer. This not only increases the functionality of the bicycle, but also provides convenience for movement after folding, making it convenient to carry when traveling. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a utility model Figure 1 Enlarged view of the structure at point A in the middle;

[0016] Figure 3 This is a structural schematic diagram of the U-shaped frame of this utility model;

[0017] Figure 4 This is a structural schematic diagram of the foot pedal crank accessory plate assembly of this utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the foot pedal crank accessory installed on the second section when the folding mechanism is of this utility model;

[0019] Figure 6 This is a schematic diagram of the structure of the brake cable connection in this utility model;

[0020] Figure 7 This is a schematic diagram of the structure of this utility model when folded into a pull-rod cart;

[0021] Figure 8 This is a schematic diagram of the structure of this utility model when folded into a trailer.

[0022] In the diagram: 1. Front fork; 2. Front wheel; 3. Rear fork; 4. Rear wheel; 5. Pedal crank accessory plate assembly; 51. Chainstay; 52. Sprocket assembly; 521. Drive sprocket; 522. First sprocket; 523. Second sprocket; 524. Third sprocket; 525. Fourth sprocket; 526. Driven sprocket; 527. Drive chain; 528. First chain; 529. Second chain; 53. Crankshaft; 54. Pedal crank accessory; 6. Seat; 7. Handlebar; 8. First section; 81. Telescopic tube one; 82. Telescopic bar. 2; 83. First locking buckle; 9. Second section; 10. Riser; 11. Pulley; 12. Connecting hole; 13. Slot; 15. U-shaped frame; 16. Storage hole; 17. Riding hole; 18. Pin; 19. First locking buckle; 20. Gravity rope; 21. Brake handle; 22. Front brake; 23. Rear brake; 24. Brake cable; 25. Bolt; 26. Internal threaded sleeve; 27. Wire rope clip connector; 28. Hanging rod; 29. ​​Connecting rod; 30. Hook; 31. First limiting block; 32. Second limiting block. Detailed Implementation

[0023] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] like Figure 1-7As shown, this utility model provides a multi-functional folding bicycle, including a frame, a front fork 1, a front wheel 2, a rear fork 3, a rear wheel 4, a pedal crank accessory plate assembly 5, a seat 6, and handlebars 7. A support frame is installed at the position of the rear wheel 4 to support the bicycle body on the ground. The frame includes a first section 8 connecting the front fork 1 and a seat tube 10, and a second section 9 connecting the rear fork 3. One end of the first section 8 and one end of the second section 9 are movable relative to each other. The seat 6 is installed on one end of the first section 8 and the second section 9. The first section 8... The other end of the first segment 8 and the other end of the second segment 9, as well as the rear fork 3 and the rear wheel 4, can all rotate relative to the seat 6. The handlebar 7 is fixed to one end of the seat tube 10. The pedal crank accessory assembly 5 is installed on the axle of the rear wheel 4. The rear of the seat 6 is provided with a pulley 11. The middle of the seat 6 is provided with a connecting hole 12 that is adapted to the seat tube 10. The end of the seat 6 is provided with a slot 13 that is adapted to the seat tube 10. A basket 14 is detachably installed on the seat tube 10. Both the first segment 8 and the second segment 9 include a telescopic tube 81 and a telescopic extension tube 82. The second retractable tube 82 and the first telescopic tube 81 are fitted onto the second telescopic tube 82 and secured by the first locking buckle 83. After the first locking buckle 83 is opened, the first telescopic tube 81 can rotate when it is inside the second telescopic tube 82. One end of the first telescopic tube 81 is hinged to a U-shaped frame 15, which has a storage hole 16 and a riding hole 17. The first telescopic tube 81 has a limit hole, and both the storage hole 16 and the riding hole 17 have pins 18. When the limit hole of the first telescopic tube 81 aligns with the storage hole 16, it is in the storage state; when the limit hole of the first telescopic tube 81 aligns with the riding hole 17, it is in the riding state. When the hole 17 is aligned, the bicycle is in an open and rideable state. The stem 10 is installed on the front fork 1 through the second locking buckle 19. When the second locking buckle 19 is opened, the stem 18 can be detached. The top of the U-shaped frame 15 is fixedly connected to the first sleeve, and the bottom of the seat 6 is fixedly connected to the second sleeve. The first sleeve is fitted into the second sleeve and fixed by the locking buckle, which facilitates the adjustment of the height of the seat 6 and the rotation of the seat 6 to change the orientation of the seat 6. The second telescopic rod 82 of the first section 8 is fixedly connected to the front fork 1, and the second telescopic rod 82 of the second section 9 is fixedly connected to the rear fork 4.

[0025] like Figure 1 , 2As shown in Figures 3, 5, 7, and 8, the front wheel 2 is mounted on the front fork 1 via an axle. The front fork 1 is tilted 20-25° towards the pedal crank accessory plate assembly 5, and the rear fork 3 is tilted 10-15° towards the pedal crank accessory plate assembly 5. When folded, this increases the height of the pedal crank accessory plate assembly 5 from the ground. The rear wheel 4 is mounted on the rear fork 4 via an axle. The telescopic tube 82 is provided with multiple sets of female buckles, and one side of the basket 14 is provided with a female buckle that cooperates with the female buckle. In this embodiment, the basket 14 has a foldable structure, presenting an L-shaped structure when folded. The basket 14 is assembled from 5 mesh panels with hooks to form a basket structure with an open top. Since the basket 14 is existing technology, the folding process will not be described in detail. When folding for use, first remove the bicycle... Fold the basket 14 into an L-shape and open the second locking port 19 to remove the seat tube 10 from the front fork 1. Then retract the first section 8 and the second section 9. Specifically, open the first locking buckle 83 so that the telescopic tube 1 81 retracts into the telescopic rod 2 82. Then rotate the rear wheel 4 and the front wheel 2 by 90°. When the rear wheel 4 rotates 90°, it will drive the pedal crank accessory assembly 5, the rear fork 3, and the telescopic tube 2 82 of the second section 9 to rotate 90°. Similarly, when the front wheel 2 rotates 90°, it will drive the front fork 1 and the telescopic tube 2 82 of the first section 8 to rotate 90°. After the telescopic tube 2 82 rotates 90°, it is fixed by the first locking buckle 83. Then remove the pin 18 and move the first section 8 and the second section 9 relative to each other. This allows the limiting hole of the telescopic tube 81 to align with the storage hole 16 and be secured by inserting the pin 18. Simultaneously, the seat 6 is rotated 90°. The folded basket 14 is then installed on the telescopic tube 82 using female and male buckles. The basket 14 prevents the front wheel 2 and rear wheel 4 from separating. When used as a trolley, the removed upright tube 10 is inserted into the connecting hole 12, using the front wheel 2 and rear wheel 4 as rolling wheels. Luggage can be secured to the folded basket 14 and telescopic tube 82 with ropes, facilitating luggage transport. When used as a trailer, the removed upright tube 10 is inserted into the slot 13, using the front wheel 2, rear wheel 4, and pulley 11 as rolling wheels. The folded and stowed trolley or trailer is not only easy to carry but also... This folding bicycle is suitable for use in vehicles such as railways, high-speed trains, trains, buses, and the trunks of private cars. It is also convenient for moving and transporting goods, or for shopping in supermarkets or farmers' markets, such as for buying heavy items with high density like rice, flour, and oil. In this embodiment, retractable wheel chocks are installed on the front fork 1 and rear fork 3 to prevent water and mud from splashing onto the rider. One end of the wheel chock can be equipped with a support plate. When folded into a trolley, the wheel chocks can be unfolded when not in use, and the support plate can be in contact with the ground to stand the trolley upright as a support, eliminating the need for constant support. When unfolded for riding, the wheel chocks can be retracted to prevent them from extending too far and affecting the ride. The folding bicycle provided by this utility model can also be used as an electric vehicle with a battery.

[0026] The pedal crank accessory plate assembly 5 includes a chainstay 51, a sprocket assembly 52 mounted on the chainstay 51, a crankshaft 53, and a pedal crank accessory 54. The sprocket assembly 52 sequentially includes a drive sprocket 521, a first sprocket 522, a second sprocket 523, a third sprocket 524, a fourth sprocket 525, and a driven sprocket 526. The first sprocket 522, the second sprocket 523, the third sprocket 524, and the fourth sprocket 525 are all mounted on the chainstay 51 via the same shaft. Driven sprocket 526 is mounted on the axle of rear wheel 4. Drive sprocket 521 is connected to first sprocket 522 via drive chain 527. Second sprocket 523 and third sprocket 524 are connected via first chain 528. Fourth sprocket 525 and driven sprocket 526 are connected via second chain 529. Crankshaft 53 is mounted on drive sprocket 521. Foot crank accessory 54 is mounted on both ends of crankshaft 53 via bolts 25, facilitating the disassembly and installation of foot crank accessory 54.

[0027] like Figure 4 As shown, in this embodiment, the diameter of the driving sprocket 521 is larger than that of the first sprocket 522, the diameter of the second sprocket 523 is larger than that of the third sprocket 524, and the diameter of the fourth sprocket 525 is larger than that of the driven sprocket 526. This increases transmission efficiency. At the same time, compared with the sprockets of the prior art, the diameter of the driving sprocket 521 is reduced under the same transmission ratio, preventing the driven sprocket 521 from being too large when stored as a trailer or trolley, thus affecting the storage effect. In addition, a protective cover is installed on the outside of the pedal assembly 5 to prevent the chain and sprocket from being exposed, which would affect the aesthetics and usability.

[0028] Each of the telescopic tubes 82 is provided with an internal threaded sleeve 26 that is compatible with the bolt 25.

[0029] like Figure 5 As shown, after the foot crank accessory 54 is removed, it is installed on the internal threaded sleeve 26. Then, the removed bolt 25 is installed in the internal threaded sleeve 26 to clamp the foot crank accessory 54 and fix it on the telescopic tube 2 82. The foot pedal of the foot crank accessory 54 is used to support the folded basket 14 and can be used indirectly to support luggage and other items.

[0030] The U-shaped frame 15 has a hanging rod 28 on one side, and a connecting rod 29 is provided on the top of one side of the basket 14. One end of the connecting rod 29 has a hook 30.

[0031] like Figure 7 As shown in Figure 8, the other end of the connecting rod 29 is hinged to one side of the basket 14. When the basket 14 is unfolded, the connecting rod 29 is located inside the basket 14. When folded, the hook 30 at one end of the connecting rod 29 is hung on the hanging rod 28, which further fixes the basket 14.

[0032] The rear lower fork 51 is rotatably mounted on the axle of the rear wheel 4. The two ends of the axle are fixed with first limiting blocks, and the rear lower fork 51 is provided with a second limiting block. The end of the rear lower fork 51 near the drive sprocket 521 is connected to the U-shaped frame 15 and the first segment 8 respectively through gravity rope 20.

[0033] like Figure 1 and Figure 4 As shown, the first limiting block 31 can prevent the second limiting block 32 from moving downward, which indirectly prevents the pedal crank accessory plate assembly 5 from falling as a whole, so that the pedal crank accessory plate assembly 5 can only rotate downwards 51 in the direction of the second segment 9. Hooks are provided on the bottom of the U-shaped frame 15 and on the telescopic tube 81 of the first segment 8. One end of the gravity rope 20 is hung on the hook. The two gravity ropes 29 can be used to fix the pedal crank accessory plate assembly 5 and prevent the pedal crank accessory plate assembly 5 from rotating while riding. In this embodiment, the telescopic tube 82 of the second segment 9 is also provided with a hook. The two gravity ropes 29 can further restrict the downward rotation of the pedal crank accessory plate assembly 5. When folding and storing, the gravity rope 20 is released from the hook and rotates downwards 51 in the direction of the second segment 9, wrapping the gravity rope 20 around the telescopic tube 82 of the second segment 9. After wrapping, it is hooked on the hook on the telescopic tube 82 of the second segment 9 to limit the pedal crank accessory plate assembly 5.

[0034] The handlebars 7 are equipped with two brake levers 21, one on the left and one on the right. The front wheel 2 is equipped with a front brake 22, and the rear wheel 4 is equipped with a rear brake 23. Both brake levers 21 are connected to the front brake 22 and the rear brake 23 respectively via brake cables 24. The brake cable 24 connected to the rear brake 23 passes through the riser 10, the U-shaped frame 15, the first segment 8 and the second segment 9 in sequence and is limited by a buckle. Each brake cable consists of two segments. The steel wire rope of the two segments of the brake cable 24 passes through a steel wire rope buckle connector 27 near the second locking buckle 19. This does not affect the use of the steel wire rope in the brake cable 24 during riding.

[0035] like Figure 1 and 6 As shown, in this embodiment, the handlebar 7 can be folded. The folding principle and structure are both existing technologies. Similarly, the structures of the brake lever 21, the front brake 23, the rear brake 23, and the brake cable 24 are all existing technologies and will not be described in detail here. The purpose of folding is to reduce the area of ​​the handlebar 7 for easier use. The brake cable 24 on the rear brake 23 is limited by a buckle as it passes through the riser 10, the U-shaped frame 15, the telescopic tube 82 of the first section 8, and the telescopic tube 82 of the second section 9. When the riser 10 is disassembled, the wire rope buckle connector 25 can be opened to separate the two sections of the brake cable 24. They can then be reconnected when in use without affecting the disassembly and use of the riser 10.

[0036] When the bicycle is in the open position, such as Figure 7 and Figure 8 As shown, when folding is required, S1: remove the basket 14 and fold the basket 14 into an L-shaped structure, open the wire rope buckle connector 25 and the second locking port 19, remove the riser 10 from the front fork 1, and then detach the gravity rope 20 from the hook.

[0037] S2: Then open the first locking buckle 83, so that the telescopic tube 1 81 retracts into the telescopic rod 2 82, and drive the rear wheel 4, the moving foot crank accessory assembly 5, the rear fork 3, the telescopic tube 2 82 of the second section 9, the front wheel 2, the front fork 1 and the telescopic tube 2 82 of the first section 8 to rotate 90°. After rotating 90°, lock the first locking buckle 83 again, and then rotate the rear fork 51 in the direction of the second section 9 to wrap the gravity rope 20 around the telescopic tube 2 82 of the second section 9. After wrapping, hang the end of the gravity rope 20 on the hook on the telescopic tube 2 82 of the second section 9, and at the same time rotate the seat 6 by 90°.

[0038] S3: Remove the pin 18, then drive the first segment 8 and the second segment 9 to rotate relative to each other, so that the limiting hole on the telescopic tube 81 corresponds to the storage hole 16, and then insert the pin 18.

[0039] S4: After removing the foot crank accessory 54, install it on the internal threaded sleeve 26. Then install the removed bolt 25 into the internal threaded sleeve 26. Then hang the hook 30 on the hanging rod 28 and snap the male buckle on the basket 14 and the female buckle on the telescopic tube 2 82 together to fix the basket 14.

[0040] S5: When carrying lightweight items such as luggage, it can be folded into a trolley. Insert the disassembled upright tube 10 into the connecting hole 12 and use the front wheel 2 and rear wheel 4 as rolling wheels. When carrying items such as grain, oil, rice, and flour, it can be used as a trailer. Insert the removed upright tube 10 into the slot 13 and use the front wheel 2, rear wheel 4, and pulley 11 as rolling wheels.

[0041] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A multi-functional folding bicycle comprising a frame, a front fork (1), a front wheel (2), a rear fork (3), a rear wheel (4), a pedal crank attachment plate assembly (5), a saddle (6) and a handlebar (7), characterized in that: The frame comprises a first section (8) connected with the front fork (1) and a vertical pipe (10), a second section (9) connected with the rear fork (3), one end of the first section (8) and one end of the second section (9) are relatively movable, the saddle (6) is installed on one end of the first section (8) and the second section (9), the other end of the first section (8) and the front fork (1) and the front wheel (2), the other end of the second section (9) and the rear fork (3) and the rear wheel (4) are all rotatable relative to the saddle (6), the tail of the saddle (6) is provided with a pulley (11), the middle and the front end of the saddle (6) are respectively provided with a connecting hole (12) and a clamping groove (13) matched with the vertical pipe (10), and the vertical pipe (10) is detachably installed with a basket (14).

2. A multi-functional folding bicycle as claimed in claim 1, wherein: The first section (8) and the second section (9) both comprise a telescopic pipe one (81) and a telescopic pipe two (82), the telescopic pipe one (81) is sleeved on the telescopic pipe two (82) and is fixed through a first locking buckle (83), one end of the telescopic pipe one (81) is hingedly connected with a U-shaped frame (15), the U-shaped frame (15) is provided with a storage hole (16) and a riding hole (17), and the storage hole (16) and the riding hole (17) are both provided with a bolt (18), and the vertical pipe (10) is installed on the front fork (1) through a second locking buckle (19).

3. A multi-functional folding bicycle as claimed in claim 2, wherein: The pedal crank accessory plate assembly (5) comprises a rear lower fork (51), a sprocket assembly (52) arranged on the rear lower fork (51), a crankshaft (53) and a pedal crank accessory (54), the sprocket assembly (52) comprises a driving sprocket (521), a first sprocket (522), a second sprocket (523), a third sprocket (524), a fourth sprocket (525) and a driven sprocket (526) in sequence, the first sprocket (522) and the second sprocket (523), the third sprocket (524) and the fourth sprocket (525) are all installed on the rear lower fork (51) through the same rotating shaft, the driven sprocket (526) is arranged on the wheel shaft of the rear wheel (4), the driving sprocket (521) is connected with the first sprocket (522) through a driving chain (527), the second sprocket (523) and the third sprocket (524) are connected through a first chain (528), the fourth sprocket (525) and the driven sprocket (526) are connected through a second chain (529), the crankshaft (53) is installed on the driving sprocket (521), and the pedal crank accessory (54) is installed on both ends of the crankshaft (53) through a bolt (25).

4. A multi-functional folding bicycle as claimed in claim 3, wherein: The telescopic pipe two (82) is provided with an internal thread sleeve (26) matched with the bolt (25).

5. A multi-functional folding bicycle as claimed in claim 4, wherein: One side of the U-shaped frame (15) is provided with a hanging rod (28), the top of one side of the basket (14) is provided with a connecting rod (29), and one end of the connecting rod (29) is provided with a hook (30).

6. The multi-functional folding bicycle according to claim 4, wherein: The rear lower fork (51) is rotatably installed on the wheel shaft of the rear wheel (4), the both ends of the wheel shaft are fixedly connected with first limiting blocks (31), the rear lower fork (51) is provided with second limiting blocks (32), and one end of the rear lower fork (51) close to the driving sprocket (521) is connected with the U-shaped frame (15) and the first section (8) through gravity ropes (20) respectively.

7. The multi-functional folding bicycle according to claim 2, wherein: The handlebar (7) is provided with left and right brake handles (21), the front wheel (2) is provided with a front brake (22), the rear wheel (4) is provided with a rear brake (23), the two brake handles (21) are connected with the front brake (22) and the rear brake (23) through brake lines (24) respectively, the brake line (24) connected with the rear brake (23) passes through the vertical pipe (10), the U-shaped frame (15), the first section (8) and the second section (9) in sequence and is limited by a buckle, and the brake line comprises two sections, and the steel wire ropes of the two sections of brake lines are connected through a steel wire rope buckle connector (27).

Images