A folding locking structure of a folding bicycle

Abstract

The application relates to a folding locking structure of a folding bicycle, which comprises a front folding structure, a rear folding structure, a front locking structure and a rear locking structure, namely a linkage locking structure, the rear folding structure is connected with the front folding structure through a flexible connecting part on the linkage locking structure, the rear locking structure can unlock the longitudinal rotation of the front and rear locking structures and the front and rear folding structures through one operation of the linkage locking structure, meanwhile, the linkage locking structure linkage-coupling locking place unlocks the longitudinal rotation of the seat tube, the outer surfaces of the front and rear large beams are completely flush without any protrusion or depression after the front folding structure is closed, the quick-release handle recess structure is coupled with the rear large beam protruding structure, so that the quick-release handle becomes a part of the appearance of the frame, the longitudinal rotation of the rear fork is locked, the folding rear seat is rotated longitudinally downwards and rearwards to approach the front and rear wheels which are parallel without being staggered.

Description

Technical Field

[0001] This invention relates to the field of transportation technology, and in particular to a folding locking structure for a folding bicycle. Background Technology

[0002] The folding box or folding device on existing folding bicycles is collectively referred to as a folding structure. The folding box or folding device also includes a locking structure. When the existing folding structure is applied to the frame of a folding bicycle, it appears as a protruding joint that is not smooth, uneven, or aesthetically pleasing. The protruding folding structure is also easily touched, causing the rider to bump or scratch it, resulting in safety issues.

[0003] In the existing technology, there is a folding bicycle with the English name BROMPTON and the Chinese name Xiaobu, which has a protruding folding structure. Xiaobu can be found on Taobao. The folding structure above the front wheel of the Xiaobu folding bicycle is a protruding folding structure. The locking structure above the rear frame of the small cloth bicycle and the longitudinal rotating and folding structure below the rear frame are separate. When riding, the locking structure above the rear frame will wobble due to the force being released. The reason for this wobble is that the rear locking structure is connected by only one hook, which causes the rear frame to wobble from side to side. When the seat post of the Xiaobu folding bicycle is folded, it slides downwards to be stored. This downward sliding makes the seat higher than the folded frame, and the seat occupies space outside the folded frame, thus increasing the volume of the folded frame. The width of the offset between the front and rear wheel axles after folding increases significantly. The offset two wheels are unstable after folding. To push the offset two wheels after folding, auxiliary wheels must be added. In addition to adding auxiliary wheels, auxiliary parts are also added to fix the offset two wheels. The front and rear folding structure of the Xiaobu requires more than two operations to unlock or lock, making the folding experience very poor, because the front and rear folding structures are unlocked or locked separately.

[0004] To overcome the above deficiencies, this invention designs a folding locking structure for a folding bicycle, which avoids the aforementioned defects and effectively solves the above technical problems. Summary of the Invention

[0005] The technical solution of the present invention overcomes the above-mentioned shortcomings, and the present invention provides a folding locking structure for a folding bicycle.

[0006] The technical solution adopted in this invention is: a folding locking structure for a folding bicycle, including but not limited to: a seat, handlebars, handlebar stem, upper end of handlebar folding lock, lower end of handlebar folding lock, front fork, steering shaft, front wheel hinge, front wheel, rear wheel, magnet, and set screw. The key components are the front frame, rear frame, rear fork, drive bracket, seat post, front folding structure, front locking structure, linkage locking structure, rear folding structure, and rear locking structure.

[0007] The front end of the front beam is fixedly connected to the head tube and the steering shaft above the front fork, which can be hinged to rotate left and right. The rear end of the front beam is fixedly connected to a front folding connection part, which is fixedly connected at an angle inside the cavity of the front beam. The front folding connection part is a blind hole without threads, and the connection hole is not visible from the outside of the front beam. A front beam linkage hinge part is fixedly connected above the front folding connection part. The front beam linkage hinge part is a threaded hole. The front folding connection part is provided with a set screw threaded hole for hinged set screw to tighten the threaded shaft at the optical axis.

[0008] The rear folding connection at the front end of the rear beam is rotatably hinged to the front folding connection via a threaded shaft. The rear folding connection is also a blind hole, which is not visible from the outside of the rear beam. The rear folding connection is a threaded hole and is fixedly connected obliquely inside the rear beam tube. The rear end of the rear beam is provided with a rear fork hinge. The two sides of the rear fork hinge are recessed below the rear beam tube wall. The portion recessed below the rear beam tube wall on one side is leveled by a protruding piece on one side of the rear fork. The portion recessed below the rear beam tube wall on the other side is leveled by a quick-release handle. The rear beam opening is longitudinally located at the middle position below the rear fork hinge, allowing the wire rope linkage hinge to slide back and forth at the rear beam opening. The semi-open semi-circular structure above the rear fork hinge at the rear end of the rear beam is coupled with the circular seat tube. The rear beam protrusion on one side of the rear end of the rear beam is coupled with the recessed structure of the quick-release handle in front of the quick-release handle to lock the longitudinal rotation of the rear fork.

[0009] The rear fork has a rear beam hinge at the front. The rear beam hinges on both sides can be longitudinally rotated and hinged to the rear fork hinges via quick-release shafts and quick-release adjusting screws. The rear wheel hinge is located at the rear end of the rear fork and hinges to the rear wheel. A magnet on one side of the rear wheel attracts and locks the two parallel wheels together with a magnet on the side of the front wheel. The rear fork linkage hinge is fixedly connected to the lower rear of the rear beam hinges on both sides. The rear fork linkage hinges on both sides are not through shafts. The rear fork opening is located above the front of the rear beam hinges on both sides. When locked, the rear fork opening tightens and narrows, so that there is no gap in the lateral hinge between the rear beam hinge, the rear fork hinge, the seat post longitudinal opening, and the drive bracket opening.

[0010] The drive bracket is provided with a wire rope linkage hinge at the front upper part, and a drive bracket opening is provided behind the wire rope linkage hinge. Wire rope hinges are hinged to both sides of the wire rope linkage hinge, and rollers are hinged to both sides of the wire rope hinge. The drive bracket hinges on both sides of the drive bracket opening and the rear fork linkage hinges on both sides are rotatably hinged. When riding, the drive bracket opening is locked on the quick-release adjusting screw to prevent the drive bracket and rear fork from rotating longitudinally backward and upward. A bottom bracket is provided below the drive bracket. The bottom bracket of the present invention moves back and forth with the drive bracket to bring the folded bottom bracket close to the rear wheel, and the bottom bracket close to the rear wheel makes the overall volume of the frame smaller after folding.

[0011] The seat post has a rotatable and slidable articulated seat above it. The rear seat post hinge at the lower end of the seat post is hinged to the rear fork hinge cavity via a quick-release shaft and quick-release adjusting screw, allowing it to rotate longitudinally downwards. A semi-circular opening in front of the seat post hinge is coupled with a roller to lock the longitudinal rotation of the seat post. A longitudinal opening is located in the middle rear of the semi-circular opening, allowing the drive bracket opening to slide in and be clamped.

[0012] The threaded shaft is half threaded and half smooth. The smooth part of the threaded shaft is fixedly connected to the front folding connection part by a set screw. The threaded part of the threaded shaft is rotatably hinged to the rear folding connection part. The threaded part of the threaded shaft is tightened and loosened as the front beam folds and rotates, and the transverse hinge gap between the contact surfaces of the front and rear folding connection parts forms the transverse locking of the front locking structure.

[0013] One end of the wire rope is provided with a stop bead, and the other end of the wire rope is provided with a wire rope hinge. The wire rope adjusting screw is rotatably and slidably hinged between the stop bead and the wire rope hinge. The wire rope first passes through the wire rope adjusting screw to fix the stop bead and the wire rope hinge. The wire rope adjusting screw is then rotatably hinged to the front beam linkage hinge. The inner hole of the wire rope adjusting screw is unthreaded, while the outer thread is rotated and coupled with the thread of the front beam linkage hinge. The notch at the rear end of the wire rope adjusting screw is used for rotational adjustment. The flexible connection between the drive bracket and the front beam via the wire rope within the front folding structure tube is smoother and less prone to jamming, because the wire rope can bend freely within the front and rear beam tubes.

[0014] The roller hinged steel wire rope linkage hinge on both sides can prevent the steel wire rope linkage hinge from getting stuck in the rear beam tube and act as a pulley. The linkage roller of the steel wire rope linkage hinge is coupled with the semi-circular opening of the seat tube to lock the longitudinal rotation of the seat tube.

[0015] The quick-release shaft is non-rotatably hinged to one side of the rear beam hinge, and the quick-release adjusting screw is rotatably hinged to the other side of the rear beam hinge. The quick-release handle hinge on the quick-release shaft is laterally rotatably hinged to the quick-release shaft hinge on the quick-release handle. The axis of the quick-release shaft is a threaded hole that is rotatably hinged to the quick-release adjusting screw. The quick-release handle, quick-release shaft, and quick-release adjusting screw lock the lateral hinge gap between the seat tube, rear fork, rear beam, and drive bracket. The quick-release handle has a recessed structure in front and a protruding structure on one side of the rear beam to couple and lock the longitudinal rotation of the rear fork.

[0016] The front folding structure is formed by hinged connection of the front folding connection part at the rear end of the front beam to the rear folding connection part at the front end of the rear beam via a threaded shaft; the front folding structure is biased towards the longitudinal hinge and can rotate forward and downward or to the forward and downward side, and the rotation can achieve two angle changes. When the front and rear folding connecting parts are laterally locked by the threaded shaft, the front and rear beams are closed. The outer surface of the front and rear folding connecting parts is completely flush with the outer surfaces of the front and rear beams without any protrusions or depressions, making the frame surface smoother and flatter.

[0017] The front locking structure is formed by fixing the threaded shaft to the front folding connection part through a set screw at the optical axis. The threaded shaft is rotatably hinged to the rear folding connection part. The threaded part is tightened and loosened as the front beam folds and rotates, and the transverse hinge gap between the contact surfaces of the front and rear folding connection parts constitutes the transverse locking of the front locking structure. The tube walls of the front and rear beams are inclined contact surfaces, which also restrict the front beam from continuing to rotate upward and move laterally on the rear beam. Without a linkage locking structure, the contact surfaces of the tube walls of the front folding structure will be more tightly locked by the longitudinal gravity of the frame itself or by the longitudinal pressure of a person on it. The above description assists in the lateral locking of the threaded shaft.

[0018] The linkage locking structure consists of a rear fork linkage hinge on both sides of the front of the rear fork that can be rotatably hinged to a drive bracket hinge on the upper rear of the drive bracket. The wire rope linkage hinge on the drive bracket is rotatably hinged to two wire rope hinges on both sides. Rollers are hinged to both sides of the wire rope hinge. The rollers on both sides are coupled with the semi-circular opening of the seat tube to lock the longitudinal rotation of the seat tube. A wire rope adjusting screw is rotatably and slidably hinged between the wire rope hinge and the brake bead. The wire rope adjusting screw is then rotatably hinged to the front beam linkage hinge. The steel wire rope linkage hinge and the front beam linkage hinge are connected by a flexible steel wire rope, allowing the corner of the folded front and rear folding connection to bend freely. The locking of the front folding structure is achieved by the rear fork linkage drive bracket and the push-pull flexible connection front beam, which allows the front and rear beams to open or close, forming a linkage locking structure. The linkage locking structure forms a triangular connection point. The first connection point is the hinged joint of the rear fork and the hinged joint of the drive bracket. The second connection point is the hinged joint of the wire rope and the roller, which locks the longitudinal rotation of the seat tube in the cavity of the rear beam. The third connection point is the clamping of the drive bracket opening. These three points form a triangular fixed rigid connection structure to assist in locking the rear folding structure. The triangular fixed rigid connection structure further restricts the longitudinal and lateral displacement of the rear fork. The linkage locking structure locks the longitudinal rotation of the seat tube and simultaneously locks the longitudinal displacement of the front folding structure.

[0019] The rear folding structure is formed by the rear fork hinge at the rear end of the rear beam being able to rotate longitudinally with the rear beam hinge at the front end of the rear fork via a quick-release shaft and quick-release adjusting screw. The seat tube hinge on the seat tube is then able to rotate longitudinally downward and backward within the cavity of the rear fork hinge via a quick-release shaft and quick-release adjusting screw. The drive bracket opening slides longitudinally into the longitudinal opening of the seat tube to form the rear folding structure.

[0020] The rear locking structure consists of a non-rotatable quick-release shaft hinged to one side of the rear beam hinge, and a rotatable rear beam hinged to the other side via a quick-release adjusting screw. The quick-release shaft and quick-release adjusting screw are rotatably hinged. The two rear beam hinges are connected to the two rear fork hinges via the quick-release shaft and quick-release adjusting screw. The seatpost hinge is connected to the cavity of the rear fork hinge via the quick-release shaft and quick-release adjusting screw. The drive bracket opening slides longitudinally into the longitudinal opening of the seatpost. The quick-release handle hinge on the quick-release shaft is laterally rotatably hinged to the quick-release shaft hinge on the quick-release handle. A notch is provided above the quick-release handle for easy opening. The recessed structure of the quick-release handle in front of the quick-release handle couples with the protruding structure of the rear beam on one side of the rear beam to lock the longitudinal rotation of the rear fork. The above description constitutes the rear locking structure. After the rear fork is longitudinally locked, the entire frame becomes a fixed rigid connection structure.

[0021] The beneficial effect of this invention is that the front and rear folding structure in the riding state is indistinguishable from a regular bicycle without folding function, regardless of the frame size or frame structure. The front folding structure and front locking structure of the frame are all hidden inside the frame tube; The front folding structure is biased towards longitudinal rotation, making it smoother to rotate laterally than ordinary folding bicycles. The threaded shaft achieves lateral locking of the front folding structure. In the riding state, the two oblique contact surfaces of the front and rear folding connection wrap around each other laterally, making the front folding structure tighter the more longitudinal force is applied. The longitudinal force applied helps to lock the threaded shaft laterally. The linkage locking structure further realizes the longitudinal linkage locking of the front folding structure, improving the rigid connection between the front and rear beams. The quick-release handle unlocks the front and rear folding structures in one operation through the linkage locking structure, and simultaneously unlocks the longitudinal rotation of the seat tube. The quick-release handle locks the longitudinal rotation of the rear fork, while simultaneously locking the lateral hinge gap between the rear fork, seat post, drive bracket and rear beam to achieve basic locking. At the same time, the triangular rigid connection structure further restricts the longitudinal and lateral displacement of the rear fork. Compared with the small cloth rear fork, the locking is more solid and less wobbly. The front and rear locking structures work together to ensure the rigidity of the frame. The front and rear folding connection parts of the present invention are fixedly connected in the cavity of the front and rear beams. Compared with the protruding folding structure of the Xiaobu, the safety problem of easy bumping during riding is completely solved. Compared with the Xiaobu folding structure, the front folding structure of the present invention is smoother, more beautiful and flatter. The quick-release handle's recessed structure in front of it couples with the protruding structure on one side of the rear beam to lock the longitudinal rotation of the rear fork. At the same time, the quick-release handle becomes part of the frame and covers the irregular structure between the drive bracket and the rear beam. A piece extends from the front of the rear fork to cover the irregular structure between the drive bracket and the rear beam on the other side. The front and rear wheel axles are locked together by magnets. When folded, the front and rear wheels are not staggered, so the relatively small size takes up little space and can be pushed directly without adding auxiliary wheels. The seat rotates backward and downward, taking up very little space. The entire frame is neat and smooth, with a simple structure and continuous folding. It is suitable for all kinds of people and can be stored indoors or in the trunk of a car when not in use, as shown in the picture. Attached Figure Description

[0022] Figure 1 This is a diagram illustrating the cycling status.

[0023] Figure 2 This is an exploded view of the front folding structure and locking structure.

[0024] Figure 3 This is an exploded view of the rear folding structure and locking structure.

[0025] Figure 4 It is an anatomical diagram of the front and back folded structure.

[0026] Figure 5 It is a folded analytical diagram.

[0027] Figure 6 This is a diagram illustrating the folding and pushing process.

[0028] Figure 7 This is a diagram showing the opening above the front and rear folding connection.

[0029] Figure 8 This is an analytical diagram showing the position of the front folding connector on the front beam.

[0030] Figure 9 This is a diagram of the front beam.

[0031] Figure 10 This is an analytical diagram showing the position of the rear folding connector on the rear beam.

[0032] Figure 11 This is a diagram of the rear beam.

[0033] Figure 12 This is a diagram of the rear forklift.

[0034] Figure 13 This is an analytical diagram showing the position of the rear fork linkage hinge on the rear fork.

[0035] Figure 14 This is an analytical diagram of the drive bracket.

[0036] Figure 15 This is a diagram of the seat tube.

[0037] Figure 16 This is an analytical diagram of a steel wire rope and rollers.

[0038] Figure 17 This is an exploded view of the rear locking structure.

[0039] Figure 18 This is a diagram illustrating the coupling between the recessed structure of the quick-release handle and the protruding structure of the rear beam.

[0040] Figure 19 This is an analytical diagram of the threaded shaft and wire rope at the hinged position of the front beam.

[0041] Figure 20 This is an analytical diagram of the linkage locking structure.

[0042] Figure 21 This is a diagram showing the mutual attraction between the front and rear wheels.

[0043] In the diagram, 1-front beam, 1-1-set screw threaded hole, 1-2-head tube, 1-3-front folding connector, 1-4-front beam linkage hinge, 2-rear beam, 2-1-rear folding connector, 2-2-rear fork hinge, 2-3-rear beam protruding structure, 2-4-rear beam opening, 2-5-semi-open semi-circular structure, 3-rear fork, 3-1-rear wheel hinge, 3-2-rear beam hinge, 3-3-rear fork linkage hinge, 3-4-rear fork opening, 4-front fork, 4-1-steering shaft, 4-3-front wheel hinge, 5-handlebar, 5-1-handlebar, 5-2-upper end of handlebar folding lock, 5-3-lower end of handlebar folding lock, 7-seat post, 7-1-longitudinal opening of seat post. 7-2-Seating tube semi-circular opening, 7-3-Seating tube hinge, 8-Seat, 9-Front wheel, 10-Rear wheel, 11-Wire rope, 11-1-Brake bead, 11-2-Wire rope hinge, 11-3-Wire rope adjusting screw, 13-Drive bracket, 13-1-Wire rope linkage hinge, 13-2-Drive bracket hinge, 13-3-Bottom connector, 13-4-Drive bracket opening, 14-Quick release shaft, 14-1-Quick release handle hinge, 14-2-Quick release adjusting screw, 15-Quick release handle, 15-1-Quick release shaft hinge, 15-2-Quick release handle recessed structure, 15-3-Quick release notch, 17-Threaded shaft, 19-Roller, 20-Magnet, 21-Setting screw. Detailed Implementation

[0044] The present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0045] The front beam 1 is fixedly connected to the head tube 1-2 and the steering shaft 4-1 above the front fork 4, which can be rotatably hinged to the left and right. The front beam 1 is fixedly connected to a front folding connecting part 1-3 at its rear end, which is hinged to a rear folding connecting part 2-1 via a threaded shaft 17. The front folding connecting part 1-3 is a blind hole without threads, meaning that the threaded shaft 17 is not visible from the inside of the front folding connecting part 1-3. A front beam linkage hinge part 1-4 is fixedly connected above the front folding connecting part 1-3. The front beam linkage hinge part 1-4 is a threaded hole that is rotatably hinged to a wire rope adjusting screw 11-3. The front folding connecting part 1-3 is provided with a set screw threaded hole 1-1. The front folding connecting part 1-3 is non-rotatably hinged to the optical axis of the threaded shaft 17. The optical axis of the threaded shaft 17 is tightened by a set screw hinged to the set screw threaded hole 1-1.

[0046] The rear folding connecting part 2-1 at the front end of the rear beam 2 is hinged to the front folding connecting part 1-3 via a threaded shaft 17. The rear folding connecting part 2-1 is also a blind hole, so the threaded shaft 17 is not visible from the outside. The rear folding connecting part 2-1 is rotatably hinged to the threaded hole and the threaded part of the threaded shaft 17. The rear end of the rear beam 2 is provided with a rear fork hinge part 2-2. The two sides of the rear fork hinge part 2-2 are recessed and lower than the tube wall of the rear beam 2. The part that is recessed and lower than the tube wall of the rear beam 2 on one side is coupled and leveled by a piece extending from one side of the rear fork 3. The part that is recessed and lower than the tube wall of the rear beam 2 on the other side is coupled and leveled by a quick-release handle 15. The rear beam opening 2-4 is longitudinally provided at the middle position of the front and rear of the rear fork hinge part 2-2, so that the wire rope linkage hinge part 13-1 can slide back and forth at the rear beam opening 2-4. The width of the rear beam opening 2-4 is the same as the width behind the wire rope linkage hinge 13-1. The opening 2-4 of the rear beam will become narrower when the locking seat tube 7 is tightened. The rear fork hinge 2-2 has a semi-open semi-circular structure 2-5 that is circularly coupled to the seat tube 7 and close to the rear beam 2. The coupling surface between the semi-open semi-circular structure 2-5 and the seat tube 7 in the riding state is also the coupling surface that restricts the seat tube 7 from continuing to rotate forward. The rear beam 2 is hinged to the quick-release handle 15 at the rear end. The rear beam protrusion structure 2-3 is coupled with the quick-release handle 15 recess structure 14-3 to lock the longitudinal rotation of the rear fork 3.

[0047] The rear fork 3 is rotatably hinged to the rear fork hinge 2-2 on one side via a quick-release shaft 14. The rear fork hinge 3-2 on the other side is rotatably hinged to the rear fork hinge 2-2 via a quick-release adjusting screw 14-2. The rear fork linkage hinge 3-3 is fixedly connected to the lower rear sides of the two rear fork hinges 3-2. The two rear fork linkage hinges 3-3 are not through shafts. When the through shaft is folded, it will get stuck on the rear fork 2, causing the rear fork 3 to be unable to rotate. The rear fork linkage hinge 3-3 is provided with a rear fork opening 3-4 at the upper front. The rear fork opening 3-4 is laterally clamped by the rear locking structure, which allows the hinge parts 3-2 of the rear beams on both sides to move inward, so that the rear fork opening 3-4 is tightened to lock the lateral hinge gap between the rear fork 3, drive bracket 13, seat tube 7 and rear beam 2. A piece extends from the front side of the rear beam hinge 3-2. This extended piece can cover the irregular structure at the junction of the drive bracket 13 and the rear beam 2. The extended piece fills the recess in the rear beam 2 and makes the frame smooth and regular. The extended piece will not get stuck when the rear fork 3 is folded and rotated to be under the rear beam 2. The other front side of the rear beam hinge 3-2 is covered by a quick-release handle 15 to cover the irregular structure at the junction of the drive bracket 13 and the rear beam 2. When the upper plane of the rear fork 3 is in a straight line with the upper planes of the rear beam 2 and the front beam 1 during riding, the rear end of the rear beam 2 is connected to the front end of the rear fork 3. The rear end of the rear fork 3 is provided with a rear wheel hinge part 3-1 to hinge the rear wheel 10. A magnet 20 that attracts the front wheel 9 is provided on one side of the rear wheel 10.

[0048] The drive bracket 13 is provided with a wire rope linkage hinge part 13-1 at the front and a drive bracket opening 13-4 at the rear of the wire rope linkage hinge part 13-1. When riding, the drive bracket opening 13-4 is locked on the quick-release adjusting screw 14-2, so that the drive bracket 13 and the rear fork 3 do not rotate longitudinally. The wire rope linkage hinge part 13-1 is hinged to wire rope hinge parts 11-2 on both sides. Rollers 19 are hinged to both sides of the wire rope hinge part 11-2. The drive bracket hinge parts 13-2 on both sides at the rear of the drive bracket opening 13-4 are rotatably hinged to the rear fork linkage hinge parts 3-3. A bottom bracket 13-3 is provided below the drive bracket 13. The bottom bracket 13-3 of the present invention moves back and forth through the drive bracket 13 so that the folded bottom bracket 13-3 is close to the rear wheel 10, and the overall volume of the folded frame is smaller. The drive bracket 13 is also part of the linkage locking structure. The drive bracket 13 locks the longitudinal rotation of the seat tube 7 and the rear fork 3, and simultaneously links the wire rope 11 to lock the front folding structure.

[0049] The seat post 7 is rotatably and slidably hinged to the seat 8. In the riding state, the rear seat post hinge 7-3 at the lower end of the seat post 7 is hinged to the cavity of the rear fork hinge 2-2 by a quick-release shaft 14 and a quick-release adjusting screw 14-2. The front of the seat post hinge 7-3 is provided with a semi-circular opening 7-2, which is coupled and locked to the roller 19 hinged on the wire rope linkage hinge 13-1 to lock the longitudinal rotation of the seat post 7. The radius of the semi-circular opening 7-2 is the same as the radius of the roller 19. The rear of the semi-circular opening 7-2 is provided with a longitudinal opening 7-1 to facilitate the sliding and clamping of the drive bracket opening 13-4 behind the wire rope linkage hinge 13-1. The longitudinal opening 7-1 of the seat tube at the middle position behind the semi-circular opening 7-2 is the same width as the rear of the wire rope linkage hinge 13-1. When installing the linkage locking structure, first remove the seat tube 7.

[0050] The threaded shaft 17 is half threaded and half smooth. The threaded part of the threaded shaft 17 is rotatably hinged to the rear folding connection part 2-1, and the smooth part of the threaded shaft 17 is not rotatably hinged to the front folding connection part 1-3. The threaded shaft 17 has a set screw 21 hinged on the set screw thread hole 1-1 at the optical axis, which is equivalent to the optical axis being fitted with a nut. This nut is the front beam 1 and the screw hole is the rear beam 2. When the front and rear folding joints are in the folded state, the screws are loose. When riding, the front and rear folding joints are in the folded state, the screws are tight. The tightening state means tightening the lateral hinge gap between the hinge surfaces of the front and rear folding joints. However, this tightening is maintained at the last short distance. This short-distance tightening can balance the locking force and folding flexibility to prevent the threaded shaft 17 from getting stuck. As long as this force is broken, it will be easy to rotate to the folded state. The front beam 1 is laterally locked by rotating and locking the front folding structure on the rear beam 2 via the threaded shaft 17, thus forming the front locking structure.

[0051] One end of the wire rope 11 is provided with a stopper 11-1, and the other end is provided with a wire rope hinge 11-2. The wire rope adjusting screw 11-3 is rotatably and slidably hinged between the stopper 11-1 and the wire rope hinge 11-2. The wire rope 11 is hinged with the drive bracket 13 and the rear fork 3 to form a linkage locking structure. There will be an opening above the front and rear folding connection when the structure is folded. The tension of the wire rope 11 between the wire rope linkage hinge 13-1 and the front beam linkage hinge 1-4 can be adjusted at the opening. Rotating the wire rope adjusting screw 11-3 to the left or right will tighten the front folding structure when the wire rope adjusting screw 11-3 is rotated forward on the front beam linkage hinge 1-4 and presses against the brake bead 11-1, and will loosen the front folding structure when it is adjusted backward. The drive bracket 13 and the front beam 1 are flexibly connected by steel wire ropes, allowing for smoother bending within the front folding structure without jamming. The steel wire rope 11 is hinged to the drive bracket 13 and the front beam 1 in the cavity of the front beam 1 and the rear beam 2, so that the front folding structure and the linkage locking structure are completely hidden.

[0052] The rollers 19 are hinged on both sides of the wire rope linkage hinge 13-1, which can prevent the wire rope linkage hinge 13-1 from getting stuck inside the frame tube and act as pulleys. The diameter of the roller 19 is larger than that of the wire rope hinge 11-2, so that the wire rope hinge 11-2 does not directly contact the wall of the rear beam 2, making the drive bracket 13 slide back and forth more smoothly. The steel wire rope linkage hinge part 13-1 hinge roller 19 slides backward and locks onto the semi-circular opening 7-2 of the seat tube to lock the longitudinal rotation of the seat tube 7. The roller 19 does not directly contact the tube wall of the rear beam 2 so that the rear beam 2 bears very little pressure, which can improve the rigidity of the rear beam 2 because the pressure is distributed to the semi-circular opening 7-2 of the seat tube.

[0053] The front folding structure is formed by the front folding connecting part 1-3 at the rear end of the front beam 1 being hinged to the rear folding connecting part 2-1 at the front end of the rear beam 2 via a threaded shaft 17. The front folding structure is biased towards the longitudinal hinge, which can rotate forward and downward or to one side forward and downward. This rotation can achieve two angle changes. The front folding structure is biased towards the longitudinal hinge. When folding, the rotating linkage of the front wheel 9 is offset from the rear beam 2 to a predetermined position. When folding, the front and rear wheels will not collide but will be parallel and not misaligned. The misalignment means that the axle centers of the front and rear wheels are aligned. The misalignment of the front and rear wheels makes locking after folding simpler and more practical. The fact that the front and rear wheels will not be misaligned allows for direct pushing without the need to add auxiliary wheels and saves space. When the front and rear folding connecting parts are laterally locked by the threaded shaft 17, the front and rear beams are closed. The outer surface of the front and rear folding connecting parts is completely flush with the outer surfaces of the front beam 1 and the rear beam 2 without any protrusions or depressions. The folding interface position cannot be distinguished from any angle of the frame, making the frame surface smoother and flatter. There will be an opening above the front and rear folding connection when the folded state is in progress. The installation and adjustment of the threaded shaft 17 and the wire rope 11, as well as the adjustment of the hinge gap between the front and rear folding connection, are all done through the opening. The installation of the set screw 21 and the wire rope adjusting screw 11-3 are also done through the opening.

[0054] The front locking structure is fixedly connected to the front folding connection part 1-3 by the threaded shaft 17 optical axis through the set screw 21. The threaded shaft 17 is rotatably hinged to the rear folding connection part 2-1. The front beam 1 is fixedly connected to the threaded shaft 17, which is equivalent to a screw cap. The screw hole is the rear beam 2. The threaded shaft 17 tightens and loosens with the folding and rotation of the front beam 1. The lateral gap between the contact surfaces of the front and rear folding connection parts forms the lateral locking of the front locking structure. The front and rear folding connection is made by making a circular hole at an angle on the tube. The angle of this circular hole is only visible when looking directly at the contact surface of the front and rear folding connection. It is not visible when looking at the side of the frame. The tube wall mating surface of the circular hole is a slope. The sloped mating is such that the sloped tube wall of one side of the front beam 1 wraps around the sloped tube wall of one side of the rear beam 2, and the sloped tube wall of the other side of the rear beam 2 wraps around the sloped tube wall of the other side of the front beam 1, forming a horizontally wrapped state. Since the tube walls around the front and rear folding connection are sloped, there is no lateral displacement. It will not separate even without a linkage locking structure. Even if the threaded shaft 17 is not tightened, the front and rear folding connection can still be locked by the sloped mating surface of the front and rear beam tube walls. The horizontally wrapped tube walls assist in the horizontal locking of the threaded shaft 17. The front folding structure itself is biased towards longitudinal hinge. Without a linkage locking structure, the oblique contact surface of the tube wall of the front folding structure forms a complete folding locking structure through the longitudinal gravity of the frame itself or by the longitudinal downward pressure of a person on it. The oblique contact surfaces of the front and rear beams also restrict the front beam 1 from continuing to rotate upward and move laterally on the rear beam 2. The above description assists in the lateral locking of the threaded shaft 17.

[0055] The linkage locking structure consists of a rear fork linkage hinge 3-3 on the rear fork 3 that can be longitudinally rotatably hinged to a drive bracket hinge 13-2 on the drive bracket 13; a wire rope linkage hinge 13-1 on the drive bracket 13 that can be rotatably hinged to a wire rope hinge 11-2; rollers 19 are hinged to both sides of the wire rope hinge 11-2; the rollers 19 on both sides are coupled with the semi-circular opening 7-2 of the seat tube to lock the longitudinal rotation of the seat tube 7; a wire rope adjusting screw 11-3 that can be rotatably and slidably hinged between the brake bead 11-1 and the wire rope hinge 11-2; and a wire rope adjusting screw (11-3) that can be rotatably hinged to the front beam linkage hinge 1-4 to form a linkage locking structure. The linkage locking structure can improve the longitudinal rigidity of the front and rear beams; The rear fork 3 rotates backward and upward, and the roller 19 hinged on the drive bracket 13 is coupled with the semi-circular opening 7-2 of the seat tube at the front of the lower end of the seat tube 7 to lock the longitudinal rotation of the seat tube 7. At this time, the drive bracket opening 13-4 on the drive bracket 13 is also locked on the quick-release adjusting screw 14-2, so that the drive bracket 13 and the rear fork 3 cannot continue to rotate backward and upward longitudinally. At the same time, the wire rope 11 is straightened to achieve the purpose of locking the front folding structure. When the seat tube 7 is locked, the upper plane of the rear fork 3 and the upper plane of the front and rear beams are on a straight line. At this time, the quick-release handle 15 is rotated to lock the frame. The linkage locking structure forms a triangular connection point. The first connection point is the hinge of the rear fork linkage hinge 3-3 to the drive bracket hinge 13-2. The second connection point is the hinge of the wire rope linkage hinge 13-1 to the roller 19 in the cavity of the rear beam 2, which locks the longitudinal rotation of the seat tube 7. The third connection point is the drive bracket opening 13-4 clamped by the longitudinal opening 7-1 of the seat tube. The three points form a triangular rigid connection structure to assist in locking the folding structure. The triangular rigid connection structure further restricts the longitudinal and lateral displacement of the rear fork 3, making the frame less prone to shaking. The triangular rigid connection structure also strengthens the lateral and longitudinal displacement of the drive bracket 13.

[0056] The rear folding structure is formed by the rear fork hinge 2-2 at the rear end of the rear beam 2 being longitudinally rotatably hinged to the rear beam hinge 3-2 at the front end of the rear fork 3 via a quick-release shaft 14 and a quick-release adjusting screw 14-2. The cavity of the rear fork hinge 2-2 is internally connected to the seat tube hinge 7-3 on the seat tube 7 via a quick-release shaft 14 and a quick-release adjusting screw 14-2. The longitudinal opening 7-1 of the seat tube is longitudinally slid into the drive bracket opening 13-4 to form the rear folding structure. The hinge parts 3-2 of the two rear beams are outside the hinge parts 2-2 of the two rear forks, and the hinge parts 2-2 of the two rear forks are outside the seat tube hinge parts 7-3. The longitudinal opening 7-1 of the seat tube is at the opening 13-4 of the clamping drive bracket. This large ring-within-a-small ring structure can reduce the lateral displacement of each hinge part and improve the overall rigidity of the rear folding structure.

[0057] The rear locking structure consists of a quick-release shaft 14 that is non-rotatably hinged to the rear beam hinge 3-2 on one side, and the other rear beam hinge 3-2 that is rotatably hinged via a quick-release adjusting screw 14-2. The quick-release adjusting screw 14-2 is rotatably engaged with the threaded hole of the quick-release shaft 14 to tighten the lateral hinge gap between the rear beam hinge 3-2, the rear fork hinge 2-2, the seat post hinge 7-3, the seat post longitudinal opening 7-1, and the drive bracket opening 13-4. The quick-release handle hinge 14-1 on the quick-release shaft 14 is laterally rotatably hinged to the quick-release shaft hinge 15-1 on the quick-release handle 15. The quick-release handle recess 15-2 and the rear beam protrusion 2-3 are coupled to lock the longitudinal rotation of the rear fork 3, making the entire frame a fixed structure. The above description constitutes the main part of the rear locking structure. The quick-release handle 15, after being coupled with the quick-release handle recessed structure 15-2 and the rear beam protruding structure 2-3, becomes part of the frame and has a smooth appearance. The outer surface of the coupled quick-release handle 15 forms a continuous, non-misaligned surface with the side of one side of the rear beam 2, and the other side of the rear fork 3 extends out a piece that also forms a continuous, non-misaligned surface with the side of the other side of the rear beam 2. The quick-release adjusting screw 14-2 is used to adjust the tightness of the rear beam hinge 3-2, rear fork hinge 2-2, seat post hinge 7-3, seat post longitudinal opening 7-1, and drive bracket opening 13-4, leaving a small gap for longitudinal rotation. The cam structure on the quick-release handle 15 is rotated and locked to reduce the lateral hinge gap between the rear beam hinge 3-2, rear fork hinge 2-2, seat post longitudinal opening 7-1, and drive bracket opening 13-4. The cam protrusion facing the outside of the frame is the lateral hinge gap of the unlocked folding structure. When the cam protrusion of the quick release handle 15 faces the inside of the frame, it is the lateral hinge gap of the locked folding structure. At the same time, after the quick release handle recessed structure 15-2 is coupled with the rear beam protrusion structure 2-3, the rear fork 3 no longer rotates. The quick-release handle recessed structure 15-2 and the rear beam protruding structure 2-3 are coupled to improve the stability of the rear fork 3 and the longitudinal rigidity of the overall frame.

[0058] The working principle of the folding locking structure of the folding bicycle is the transition from riding state to folding state. In the riding state: the handlebar 5-1 is hinged above the handlebar 5; the upper end 5-2 of the handlebar folding lock below the handlebar 5 is hinged to the lower end 5-3 of the handlebar folding lock via a shaft; the lower end 5-3 of the handlebar folding lock is hinged to the steering shaft 4-1 on the front fork 4; the front wheel hinge part 4-3 below the front fork 4 is hinged to the front wheel 9; a magnet 20 is provided on one side of the front wheel 9; the front head tube 1-2 is fixedly connected to the front end of the front frame 1 and is hinged to the steering shaft 4-1 above the front fork 4, allowing it to rotate left and right. The rear end of the front frame 1 is fixedly connected to... The front folding connecting part 1-3 is fixedly connected to the front beam 1 at the optical axis of the threaded shaft 17 via a set screw 21. The rear folding connecting part 2-1 is rotatably hinged to the threaded shaft 17. The rear beam hinge parts 3-2 on both sides of the front end of the rear fork 3 are longitudinally rotatably hinged to the rear fork hinge parts 2-2 via a quick-release shaft 14 and a quick-release adjusting screw 14-2. The rear wheel hinge part 3-1 at the rear of the rear fork 3 is hinged to the rear wheel 10. A magnet 20 is provided on one side of the rear wheel 10. The drive bracket hinge parts 13-2 on both sides at the rear of the drive bracket 13 are longitudinally rotatably hinged to the rear fork linkage hinge parts 3-3 on the rear fork 3. The wire rope linkage hinge 13-1 at the front of the moving bracket 13 is hinged to the wire rope hinge 11-2 on the wire rope 11 inside the rear beam 2 tube. Rollers 19 are hinged to both sides of the wire rope hinge 11-2. A rotatable and slidable wire rope adjusting screw 11-3 is hinged between the wire rope hinge 11-2 and the brake bead 11-1. The wire rope adjusting screw 11-3 is rotatably hinged to the front beam linkage hinge 1-4 inside the front beam 1 tube. The seat 8 is rotatably and slidably hinged above the seat tube 7. The seat tube hinge 7-3 at the rear of the lower end of the seat tube 7 is connected to the quick-release shaft 14 and quick-release adjusting screw 11-2. The quick-release screw 14-2 is hinged longitudinally and rearward in the cavity of the rear fork hinge 2-2. The quick-release shaft 14 is hinged non-rotatably on one side of the rear beam hinge 3-2. The quick-release adjusting screw 14-2 is rotatably hinged to the other side of the rear beam hinge 3-2. The quick-release adjusting screw 14-2 is rotatably connected to the threaded hole of the quick-release shaft 14. The quick-release handle hinge 14-1 on the quick-release shaft 14 is laterally rotatably hinged to the quick-release shaft hinge 15-1 on the quick-release handle 15. The quick-release handle recess 15-2 at the front of the quick-release handle 15 is coupled to the rear beam protrusion 2-3 at the rear end of the rear beam 2. The folded state is as follows: Open the quick-release notch 15-3 above the quick-release handle 15, rotate the quick-release handle 15 laterally backward to unlock the rotation of the rear fork 3 and the lateral clamping between the rear fork hinge 2-2, the rear frame hinge 3-2, the seat post hinge 1-3, and the drive bracket opening 13-4. Lift the seat post 7 with one hand, rotate the rear fork 3 in conjunction with the drive bracket 13 and roller 19 to unlock the longitudinal rotation of the seat post 7. Simultaneously, the rear fork 3, in conjunction with the rear wheel 10, the drive bracket 13, and the wire rope 11, rotates forward and downward. At this point, the front folding structure is unlocked, and the wire rope 11 is in a bent state inside the front folding structure tube. The angle between the rear fork 3 and the rear frame 2 can only accommodate the bottom bracket 13-3, and the rear wheel is also close to the bottom bracket 13-3. The rear fork 3 then stops rotating in conjunction with the rear wheel 10. A small triangular gap is formed between the rear frame 2, the rear fork 3, and the rear wheel 10, which can only accommodate the bottom bracket 13-3. Lift the seat post 7 with the other hand. The handlebar 5, in conjunction with the front fork 4 and the front wheel 9, rotates to the rear and lower side until the front and rear wheels are parallel. The two magnets 20 attract each other, and the front frame 1 stops rotating. The quick-release handle 15 is rotated to lock the lateral hinge gap between the rear fork hinge 2-2, the rear frame hinge 3-2, and the seat post hinge 1-3. At this time, there will be an irregular opening above the rotating hinge of the front folding structure. This opening is the opening for installing and adjusting the front folding structure and the linkage locking structure. The handlebar 5, in conjunction with the upper end 5-2 of the handlebar folding lock, rotates to the side of the front wheel 9 on the lower end 5-3 of the handlebar folding lock, which is the pushing state. The seat 8 is pushed. The quick-release handle 15 is opened and the seat post 7 is rotated longitudinally to the rear and lower side until the seat 8 is close to the two parallel front and rear wheels. The quick-release handle 15 is then locked. In order to reduce the space occupied outside the frame after folding, the seat 8 is rotated close to the parallel and misaligned front and rear wheels to complete the folding.

Claims

1. A folding locking structure for a folding bicycle, comprising: Handlebar (5-1), handlebar stem (5), upper end of handlebar folding lock (5-2), lower end of handlebar folding lock (5-3), front fork (4), steering shaft (4-1), front wheel (9), rear wheel (10), seat (8), magnet (20), set screw (21), characterized in that: it includes: a front folding structure, a front locking structure, a rear folding structure and a rear locking structure, as well as a linkage locking structure; The rear folding structure is connected to the front folding structure through the flexible connection part on the linkage locking structure. The rear locking structure can unlock the longitudinal rotation of the front and rear locking structures and the front and rear folding structures with one operation of the linkage locking structure. At the same time, the linkage locking structure can unlock the seat tube (7) longitudinally rotate at the linkage coupling locking point.

2. The folding locking structure of a folding bicycle according to claim 1, characterized in that: The linkage locking structure is formed by the rear fork (3) linkage drive bracket (13), the drive bracket (13) hinges the rollers (19) on both sides of the linkage wire rope (11), the wire rope (11) then links the front beam (1) to form the linkage locking structure.

3. The folding locking structure of a folding bicycle according to claim 1, characterized in that: The front folding structure includes a front locking structure; the front beam (1) is hinged to the rear beam (2) through a threaded shaft (17) to form the front folding structure, and the outer surfaces of the front beam (1) and the rear beam (2) are completely flush without any protrusions or depressions. The front locking structure includes a threaded shaft (17) whose threaded part is tightened and loosened as the front beam (1) is folded and rotated, forming a transverse gap between the contact surfaces of the front and rear folding connection parts, thus constituting the transverse locking of the front locking structure. The inclined surfaces of the front and rear beams wrap around each other laterally to assist in the lateral locking of the threaded shaft (17). When riding, the inclined contact surfaces of the front and rear beams will be more tightly secured by the longitudinal gravity of the frame itself or by the longitudinal downward pressure of a person.

4. The folding locking structure of a folding bicycle according to claim 1, characterized in that: The rear folding structure consists of two rear beam hinges (3-2) outside the two rear fork hinges (2-2), two rear fork hinges (2-2) outside the seat tube hinge (7-3), and a seat tube longitudinal opening (7-1) at the clamping drive bracket opening (13-4). The large-ring-within-a-small-ring structure can reduce the lateral displacement of each hinge and improve the overall rigidity of the rear folding structure.

5. The folding locking structure of a folding bicycle according to claim 1, characterized in that: The rear locking structure is made by a quick-release shaft (14) that is non-rotatably hinged to the rear beam hinge (3-2) on one side, and the rear beam hinge (3-2) on the other side is rotatably hinged by a quick-release adjusting screw (14-2). The quick-release adjusting screw (14-2) is rotatably engaged with the threaded hole of the quick-release shaft (14) to tighten the lateral hinge gap between the rear beam hinge (3-2), the rear fork hinge (2-2), the seat post hinge (7-3), the longitudinal opening of the seat post (7-1), and the drive bracket opening (13-4). The quick-release handle hinge (14-1) on the quick-release shaft (14) is laterally rotatably hinged to the quick-release shaft hinge (15-1) on the quick-release handle (15). The quick-release handle recessed structure (15-2) and the rear beam protruding structure (2-3) are coupled to lock the longitudinal rotation of the rear fork (3) so that the entire frame becomes a fixed structure.

6. The folding locking structure of a folding bicycle according to claim 1, characterized in that: When installing the linkage locking structure, first remove the seat tube (7).

7. The folding locking structure of a folding bicycle according to claim 1 or 5, characterized in that: The quick-release handle (15) locks the lateral displacement of the folding structure and the longitudinal rotation of the rear fork (3).

8. The folding locking structure of a folding bicycle according to claim 2, characterized in that: The rear locking structure is assisted by a triangular rigid connection structure to lock the rear folding structure.

9. The folding locking structure of a folding bicycle according to claim 7, characterized in that: After coupling, the quick-release handle (15) becomes part of the frame and has a smooth appearance. After coupling, the outer surface of the quick-release handle (15) forms a continuous, non-misaligned surface with the side of the rear beam (2) on one side. The other side of the rear fork (3) extends out a piece and also forms a continuous, non-misaligned surface with the side of the rear beam (2) on the other side.

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