Integrated frame

Abstract

The utility model relates to the technical field of trailer frames, in particular to an integrated frame which comprises a plastic wheel support used for supporting bicycle wheels, an overturning locking device used for enabling the plastic wheel support to overturn and a square opening connecting device used for being connected with an external automobile. The plastic wheel support and the square opening connecting device are both connected to the bottom of the turnover locking device. The turnover locking device comprises a lower support, an upper support, a turnover structure and a locking structure. The square opening connecting device comprises a square opening pipe and a connecting device. According to the turnover locking device, a user can easily lock or unlock the upper support and the lower support without a tool, the trunk door can be conveniently opened, and the use flexibility and the user experience are greatly improved. According to the square opening connecting device, the slope tensioning structure and the hand wheel piece are adopted, stable connection and rapid disassembly and assembly of the connector pipe and the mounting support are achieved, the connection stability and disassembly and assembly convenience are enhanced, and the square opening connecting device is particularly suitable for use requirements under the outdoor limited conditions.

Description

Technical Field

[0001] This utility model relates to the field of trailer frame technology, and in particular to an integrated vehicle frame. Background Technology

[0002] A trailer rack is a device installed at the rear of a car, primarily used to secure and transport larger items such as bicycles, solving the problem of limited trunk space that prevents the transport of large objects. The wheel support, a key component of the trailer rack, securely supports the bicycle wheels, ensuring safety and stability during transport and making it convenient for users to carry bicycles on outdoor trips or daily commutes. However, trailer racks also have some drawbacks. For example, when a bicycle is loaded onto a trailer rack, it often obstructs the opening space of the car's trunk, preventing the trunk from opening properly. Users often have to remove the trailer rack or bicycle before opening the trunk, which not only increases the complexity and time cost of operation but also affects the convenience and overall user experience. Utility Model Content

[0003] In view of this, the present invention proposes an integrated vehicle frame, which aims to solve the problem that existing trailer frames obstruct the normal opening of the car's trunk door.

[0004] This utility model proposes an integrated bicycle frame, including a plastic wheel support for supporting bicycle wheels, a flip-locking device for flipping the plastic wheel support, and a square-mouth connecting device for connecting to an external vehicle. The plastic wheel support and the square-mouth connecting device are both connected to the bottom of the flip-locking device.

[0005] The flip-locking device includes a lower bracket, an upper bracket, a flip structure, and a locking structure. The first end of the upper bracket is hinged to the first end of the lower bracket via the flip structure. The locking structure includes a pin and a locking member. The pin passes through the first and second ends of the upper bracket. The locking member is located at the second end of the upper bracket and has a locking hole through which the pin is inserted. The pin has a first limiting post. A drive frame is movably connected to the first end of the upper bracket. The top of the drive frame has a movable groove through which the pin moves. Both sides of the drive frame have limiting holes through which the first limiting post is movably connected. A drive section is formed at the bottom of the drive frame to drive the pin to extend and retract along its length in conjunction with the first limiting post. The pin and the locking hole cooperate to lock or unlock the upper bracket or the lower bracket. The drive section includes two bent plates. The drive frame and the drive section form an L-shaped structure, and a foot pedal is provided between the two bent plates.

[0006] The square-mouth connecting device includes a square-mouth tube and a connecting device; a locking hole is provided through the diagonal of the square-mouth tube; the connecting device includes an interface tube, a mounting bracket, and a locking mechanism; the first end of the interface tube is connected to the mounting bracket, and the second end of the interface tube is provided with a movable square hole; the locking mechanism includes a first expansion block, a second expansion block, and a driving rod; the first expansion block is provided with a first inclined surface, and the second expansion block is provided with a second inclined surface and a locking part; the first inclined surface and the second inclined surface are fitted together; the first expansion block is slidably connected to the interface tube and rotatably connected to the driving rod; the mounting bracket is provided with a driving nut for threaded connection of the driving rod, so as to link the locking part to extend and retract within the movable square hole; the portion of the locking part exposed from the movable square hole is provided with a mutually perpendicular horizontal plane and a vertical plane; both the horizontal plane and the vertical plane abut against the inner wall of the square-mouth tube; two locking plates are symmetrically provided on the inner wall of the locking hole, and the opposite sides of the two locking plates abut against the locking part.

[0007] In one possible implementation, the flipping structure includes two first hinge members and two second hinge members. The two first hinge members are respectively fixed to both sides of the first end of the upper bracket by bolts. The first hinge members are hinged to the first end of the lower bracket. The second hinge members include a connecting part and a travel part. The two connecting parts are hinged to the middle of the upper bracket and are symmetrically arranged. Two travel members are symmetrically arranged in the middle of the lower bracket. The travel part has a travel groove through it along the length direction for the travel members to slide and connect.

[0008] In one possible implementation, the first end of the upper bracket is provided with a mounting bracket and a rotating shaft, the pin passes through the mounting bracket, the drive bracket has a first rotating hole passing through below the limiting waist hole, the bottom of the mounting bracket has a second rotating hole passing through, and the rotating shaft is rotatably connected in the first rotating hole and the second rotating hole.

[0009] The locking structure further includes a retaining mechanism, which acts between the first limiting post and the mounting bracket to allow the pin to extend outward from the second end of the upper bracket and be inserted into the locking hole. The retaining mechanism is a spring element, which is sleeved on the pin. A first abutting ring is sleeved on the pin at the position between the first limiting post and the mounting bracket. The two ends of the retaining mechanism abut against the opposite sides of the mounting bracket and the first abutting ring, respectively.

[0010] In one possible implementation, both the first inclined surface and the second inclined surface are parallel to the diagonal of the movable square hole corresponding to the inner cavity cross section of the square tube. The interface tube is a square tube structure, and the movable square hole extends through any opposite corner of the inner wall of the interface tube. The inner wall of the interface tube, relative to the other opposite corner of the movable square hole, abuts against the first expansion block. The inner wall of the movable square hole is provided with two guide plates, and the two sides of the locking part abut against the two guide plates respectively.

[0011] In one possible implementation, the first expansion block has a through-hole for the drive rod to rotate. The drive rod is provided with limiters at both openings of the rotation hole. The side wall of the first expansion block away from the mounting bracket has a mounting groove that communicates with the rotation hole. The limiters are provided with gaskets that are fitted onto the drive rod. The two gaskets abut against the side wall of the second expansion block and the inner wall of the mounting groove, respectively. The outer diameter of the gaskets is larger than the inner diameter of the rotation hole.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: an integrated bicycle frame includes a plastic wheel holder for supporting bicycle wheels, a flip locking device for flipping the plastic wheel holder, and a square-mouth connecting device for connecting to an external vehicle, wherein the plastic wheel holder and the square-mouth connecting device are both connected to the bottom of the flip locking device. The flip-locking device includes a lower bracket, an upper bracket, a flipping structure, and a locking structure. The lower bracket is connected to the rear of the car, and the upper bracket is hinged to the lower bracket via two first hinge members. When the upper and lower brackets are folded, a pin is inserted into the locking hole to lock the folded state of the upper and lower brackets. Users can load bicycles, luggage, and other items onto the upper bracket. When users need to open the trunk at the rear of the car, they can step down on the drive frame to cause the limit waist hole to link with the first limit post, causing the pin to move closer to the side of the mounting bracket. The pin is then pulled out of the locking hole to unlock the upper and lower brackets, allowing the user to flip the upper bracket outwards, providing space for the opening of the trunk door. Users can lock or unlock the upper and lower brackets without using tools, making operation convenient and improving the user experience. The square-mouth connecting device includes a square-mouth tube and a connecting device. A locking hole is provided at the diagonal of the square-mouth tube. The connecting device includes an interface tube, a mounting bracket, and a locking mechanism. The interface tube and the mounting bracket are detachably connected via the locking mechanism. The user only needs to turn the handwheel to move the first expansion block within the interface tube via the threaded connection of the drive nut and drive rod. This allows the first expansion block to slide closer to or further away from the second expansion block. The locking mechanism switches between locked and unlocked positions through the opposing engagement of the second and first inclined surfaces. The first and second expansion blocks form a diagonally tightened structure, ensuring a tight connection between the interface tube and the mounting bracket, thus improving the connection stability of the square-mouth connecting device. The handwheel design allows for quick and easy disassembly and assembly without tools, enhancing its convenience in outdoor conditions. In summary, this integrated frame, through the integration of plastic wheel supports, a flip-locking device, and a square-mouth connecting device, achieves a compact and easy-to-operate design. The flip-locking device allows users to easily lock or unlock the upper and lower brackets without tools, facilitating the opening of the trunk door and greatly improving flexibility and user experience. The square-mouth connection device, employing a beveled tensioning structure and handwheel, achieves a secure connection and quick assembly / disassembly between the interface tube and the mounting bracket, enhancing connection stability and ease of installation and removal, making it particularly suitable for use in limited outdoor conditions. The overall design effectively solves the problem of traditional trailer racks obstructing trunk door opening, improving the practicality and user satisfaction of the trailer rack. Attached Figure Description

[0013] Figure 1 A schematic diagram of the integrated frame in an unflipped state provided in an embodiment of this utility model;

[0014] Figure 2 A structural disassembly diagram of the integrated frame in a flipped state provided in this embodiment of the utility model;

[0015] Figure 3 A schematic diagram of the structure of the flipping locking device provided in the embodiment of this utility model;

[0016] Figure 4 yes Figure 3 Enlarged view of area A in the middle;

[0017] Figure 5 A cross-sectional view of the flip-locking device when the locking structure is in the locked state, provided in an embodiment of this utility model;

[0018] Figure 6 A cross-sectional view of the flip-locking device when the locking structure is in the unlocked state, provided in an embodiment of this utility model;

[0019] Figure 7 A schematic diagram of the flip-locking device when the upper and lower supports are in the unfolded state, provided in an embodiment of this utility model;

[0020] Figure 8 An exploded view of the structure of the flipping locking device provided in an embodiment of this utility model;

[0021] Figure 9 This is a schematic diagram of the structure of the square-mouth connecting device provided in an embodiment of the present utility model;

[0022] Figure 10 A structural cross-sectional view of the square-mouth connecting device when the locking part is in the locking position, provided in an embodiment of this utility model;

[0023] Figure 11 A cross-sectional view of the square-mouth connecting device when the locking part is in the unlocked position, provided in an embodiment of this utility model;

[0024] Figure 12 A schematic diagram of the connecting device provided in an embodiment of this utility model;

[0025] Figure 13 for Figure 12 A sectional view;

[0026] Figure 14 An exploded view of the connecting device provided in an embodiment of this utility model.

[0027] The annotations in the attached figures are explained as follows:

[0028] 10. Plastic wheel supports;

[0029] 20. Tilting locking device; 21. Lower bracket; 22. Upper bracket; 23. First hinge; 24. Second hinge; 241. Connecting part; 242. Stroke part; 25. Pin; 26. Locking part; 27. Holding mechanism; 28. Mounting bracket; 29. ​​First limiting post; 210. Second limiting post; 211. Locking hole; 212. Drive frame; 213. Movable groove; 214. Limiting waist hole; 215. Drive part; 216. Foot pedal part; 217. Second rotating hole; 218. First rotating hole; 219. Rotating shaft; 220. First abutment ring; 221. Second abutment ring; 222. Inclined surface; 223. Guide plate; 224. Stroke part; 225. Stroke groove; 226. Buffer part; 227. U-shaped upright; 228. Fixing plate; 229. Fixing hole;

[0030] 30. Square-mouth connecting device; 31. Interface tube; 32. Mounting bracket; 33. Locking mechanism; 331. Second expansion block; 332. First expansion block; 333. Drive rod; 34. Movable square hole; 35. Locking part; 36. Second inclined surface; 37. Limiting part; 38. First inclined surface; 39. Through hole; 310. Drive nut; 311. Guide plate; 312. Rotating hole; 313. Limiting component; 314. Mounting groove; 315. Gasket; 316. Handwheel component; 317. Adjusting hole; 318. Adjusting nut; 319. Square-mouth tube; 320. Locking hole; 321. Horizontal plane; 322. Vertical plane; 323. Locking plate. Detailed Implementation

[0031] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and sliding situation between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] refer to Figures 1 to 2 This utility model proposes an integrated bicycle frame, including a plastic wheel support 10 for supporting bicycle wheels, a flip locking device 20 for flipping the plastic wheel support 10, and a square-mouth connecting device 30 for connecting to an external vehicle. The plastic wheel support 10 and the square-mouth connecting device 30 are both connected to the bottom of the flip locking device 20.

[0035] This integrated frame is a new type of trailer frame. The plastic wheel holders 10 are made of lightweight and durable materials, featuring a simple structural design that facilitates quick assembly and disassembly, significantly improving installation efficiency. Furthermore, plastic is less expensive than traditional metal materials and offers excellent corrosion resistance, reducing maintenance costs and overall costs over its lifespan. This design not only simplifies the manufacturing process but also effectively controls production costs, achieving a good balance between economy and practicality while ensuring support performance. It should be noted that, to more effectively secure the bicycle, in addition to the key component, the plastic wheel holders 10, the integrated frame can also be equipped with auxiliary securing devices such as straps or cable ties to firmly connect the bicycle to the frame. These auxiliary devices prevent the bicycle from wobbling or slipping during transportation, improving overall stability and ensuring the bicycle is securely and reliably fixed to the integrated frame, thereby enhancing safety and convenience of use.

[0036] refer to Figures 3 to 8 The plastic wheel holder 10 can be mechanically connected to the bottom of the flip-locking device 20 using screws, bolts, rivets, pins, or clips to ensure the stability and reliability of the connection and facilitate installation and maintenance. It should be noted that... Figures 3 to 8 The image only shows the specific structure of the flipping locking device 20, and does not show the specific mechanical connection components between the flipping locking device 20 and the plastic wheel holder 10.

[0037] The flipping locking device 20 includes a lower bracket 21, an upper bracket 22, a flipping structure, and a locking structure. A fixing structure is provided on one side of the lower bracket 21. The fixing plate structure consists of two fixing plates 228. The fixing plates 228 have a through fixing hole 229. The fixing plates 228 are connected to the rear of the car by bolts and the fixing hole 229.

[0038] The flipping structure includes two first hinges 23 and two second hinges 24. The first hinge 23 is composed of two triangular plates. The two first hinges 23 are fixed to the two sides of the first end of the upper bracket 22 by bolts. The first hinges 23 are hinged to the first end of the lower bracket 21. The second end of the upper bracket 22 is provided with a U-shaped upright 227. The user can fold or unfold the upper bracket 22 on the lower bracket 21 by grasping the U-shaped upright 227.

[0039] The second hinge 24 includes a connecting part 241 and a travel part 242. The two connecting parts 241 are hinged to the middle of the upper support 22 and are symmetrically arranged. Two travel parts 224 are symmetrically arranged inside the lower support 21. The travel part 242 has a travel groove 225 through it along the length direction for the travel parts 224 to slide and connect. When the upper support 22 flips outward, the upper support 22 is hinged to the lower support 21 through the first hinge 23 until the inner wall of the travel groove 225 abuts against the travel part 224. The travel groove 225 then prevents the upper support 22 from continuing to move. The second hinge 24 cooperates with the travel part 224 to limit the flipping action of the upper support 22 on the lower support 21.

[0040] The first end of the stroke groove 225 is close to the connecting part 241. When the stroke member 224 abuts against the first end of the stroke groove 225, the upper support 2 and the lower support 21 are in the unfolded state.

[0041] The second end of the travel groove 225 is away from the connecting part 241. When the travel member 224 abuts against the second end of the travel groove 225, the upper bracket 22 and the lower bracket 21 are in a folded state.

[0042] The locking structure includes a pin 25, a locking element 26, and a retaining mechanism 27. A mounting bracket 28 is provided at the first end of the upper bracket 22. The pin 25 passes through the upper bracket 22 and the mounting bracket 28. A first limiting post 29 is provided at the pin 25 corresponding to the mounting bracket 28. The locking element 26 is provided at the second end of the upper bracket 22 and is located between two fixing plates 228. The locking element 26 has a locking hole 211. The retaining mechanism 27 is a spring element. The retaining mechanism 27 is sleeved on the pin 25. A first abutting ring 220 is sleeved between the pin 25 and the first limiting post 29 and the mounting bracket 28. The two ends of the retaining mechanism 27 abut against the opposite sides of the mounting bracket 28 and the first abutting ring 220, respectively. The retaining mechanism 27 acts between the first limiting post 29 and the mounting bracket 28 so that the pin 25 extends outward from the second end of the upper bracket 22 and is inserted into the locking hole 211. A second limiting post 210 is provided at the first end of the pin 25 exposed above the upper bracket 22. A second abutting ring 221 is sleeved between the pin 25 and the first end of the lower bracket 21 corresponding to the second limiting post 210. The second abutting ring 221 abuts against the side wall of the first end of the upper bracket 22 to limit the lateral movement of the pin 25 and prevent the end of the pin 25 from detaching from the upper bracket 22.

[0043] Mounting bracket 28 is movably connected to drive bracket 212. Drive bracket 212 has a first rotating hole 218 passing through below the limiting waist hole 214, and a second rotating hole 217 passing through the bottom of mounting bracket 28. A rotating shaft 219 is rotatably connected between mounting bracket 28 and drive bracket 212. The rotating shaft 219 is rotatably connected in the first rotating hole 218 and the second rotating hole 217 to guide drive bracket 212 to rotate circumferentially along rotating shaft 219. The top of drive bracket 212 has a movable groove 213 for the movement of pin 25. Limiting waist holes 214 pass through both sides of drive bracket 212, and the two ends of first limiting post 29 are movably connected in the two limiting waist holes 214 respectively.

[0044] The end of the pin 25 inserted into the locking hole 211 has an inclined surface 222. A guide plate 223 is provided on the top of the locking member 26. The guide plate 223 is inclined towards the upper bracket 22 and abuts against the inclined surface 222. When the upper bracket 22 closes to the lower bracket 21, the pin 25 moves with the upper bracket 22, and the inclined surface 222 abuts against the guide plate 223. The inclined surface 222 moves downwards along the surface of the guide plate, causing the pin 25 to move closer to the mounting bracket 28, driving the first limiting post 29 to translate towards the mounting bracket 28. A limiting post 29 drives the first abutment ring 220 to apply pressure to the retaining mechanism 27 to deform it until the end of the pin 25 corresponds to the locking hole 211. Then, the retaining mechanism 27 returns to its original shape, causing the first limiting post 29 to extend and retract along its length so that the pin 25 extends outward along the side away from the mounting bracket 28 and is inserted into the locking hole 211. This maintains the state of the pin 25 inserted into the locking hole 211 and prevents the pin 25 from coming out of the locking hole 211, thereby locking the folded state of the upper bracket 22 and the lower bracket 21.

[0045] The bottom of the drive frame 212 has a drive section 215. The drive section 215 includes two bending plates so that the drive section 215 and the drive frame 212 form an L-shaped structure. A columnar foot pedal 216 is provided between the two bending plates. The foot pedal 216 is for the user to step on, so that the user can apply pressure to the foot pedal 216 with less effort to unlock the upper bracket 22 and the lower bracket 21 through the linkage locking structure. When a user needs to open the trunk at the rear of the car, pressing down on the foot pedal 216 causes the limiting waist hole 214 to move the first limiting post 29 within the limiting waist hole 214. The first limiting post 29 overcomes the retaining mechanism 27, causing the pin 25 to extend and retract along its length and move closer to one side of the mounting bracket 28, so that the pin 25 is pulled out of the locking hole 211 to unlock the upper bracket 22 and the lower bracket 21. This allows the user to flip the upper bracket 22 outward and unfold it, providing space for the trunk door to open. During this process, the user can lock or unlock the upper bracket 22 and the lower bracket 21 without using tools, making the operation convenient and improving the user experience.

[0046] Two buffers 226 are symmetrically arranged on the top of the lower support 21. The buffers 226 are made of rubber material and have good elasticity. When the upper support 22 and the lower support 21 are in the folded state, the top surface of the buffer 226 abuts against the bottom surface of the upper support 22 to buffer the impact force when the upper support 22 closes to the lower support 21. At this time, the upper support 22 and the lower support 21 are parallel so that the user can load bicycles, luggage and other items at the upper support 22.

[0047] refer to Figures 9 to 14The square-mouth connecting device 30 can be connected to the bottom of the flip-locking device 20 using mechanical connection methods such as screws, bolts, rivets, pins, or clips to ensure the stability and reliability of the connection and facilitate installation and maintenance. It should be noted that... Figures 9 to 14 The image only shows the specific structure of the square-mouth connecting device 30, and does not show the specific mechanical connection components between the square-mouth connecting device 30 and the flip-locking device 20.

[0048] The square-mouth connecting device 30 includes a square-mouth tube 319 and a connecting device. The square-mouth tube 319 and the connecting device are respectively installed on the trailer bar of the car (the trailer bar of the car is a square trailer opening installed at the rear of the car, used to connect the trailer frame. Its main function is to bear the traction force of the trailer frame and ensure a stable connection between the trailer frame and the car, thereby realizing the safe transportation of auxiliary equipment such as bicycle racks and luggage boxes.) and the flip-locking device 20. The square-mouth tube 319 has a locking hole 320 through its diagonal, which cooperates with the connecting device for locking. The connecting device includes an interface tube 31, a mounting bracket 32 ​​and a locking mechanism 33. The first end of the interface tube 31 is connected to the mounting bracket 32. The first end of the interface tube 31 is symmetrically provided with two limiting parts 37. The opposite sides of the two limiting parts 37 abut against the two sides of the mounting bracket 32 ​​to guide the interface tube 31 to connect to the mounting bracket 32 ​​in the correct position, so as to weld and fix the interface tube 31 and the mounting bracket 32.

[0049] The interface tube 31 is a square tube structure. The second end of the interface tube 31 has a movable square hole 34 that passes through it. The movable square hole 34 passes through any opposite corner of the inner wall of the interface tube 31. The locking mechanism 33 includes a first expansion block 332, a second expansion block 331, and a drive rod 333.

[0050] The inner wall of the interface tube 31 is in contact with the first expansion block 332 at the opposite corner of the movable square hole 34. The first expansion block 332 is slidably connected to the interface tube 31 and rotatably connected to the drive rod 333. The mounting bracket 32 ​​has a through hole 39, and a drive nut 310 for threaded connection of the drive rod 333 is provided in the through hole 39. The linkage locking part 35 moves in and out of the movable square hole 34. A handwheel 316 is provided at the end of the drive rod 333 away from the first expansion block 332. When the user uses the square hole connection device 30, the contact end of the interface tube 31 is in contact with the mounting bracket 32. The user only needs to rotate the handwheel 316 to drive the drive rod 333 to rotate circumferentially. Under the threaded connection of the drive nut 310 and the drive rod 333, the drive rod 333 drives the first expansion block 332 to slide along the length direction in the interface tube 31, so that the first expansion block 332 moves closer to or away from the second expansion block 331.

[0051] The first expansion block 332 is provided with a first inclined surface 38, and the second expansion block 331 is provided with a second inclined surface 36 and a locking part 35. The first inclined surface 38 and the second inclined surface 36 are in contact with each other. The first inclined surface 38 and the second inclined surface 36 are both parallel to the diagonal of the movable square hole 34 corresponding to the inner cavity cross section of the square tube 319. When the first expansion block 332 approaches or moves away from the second expansion block 331, the locking part 35 can be switched between the locked position and the unlocked position through the contact of the second inclined surface 36 and the first inclined surface 38. The inner wall of the movable square hole 34 is provided with two guide plates 311. The two sides of the locking part 35 abut against the two guide plates 311 respectively. The two guide plates 311 are used to guide the extension or retraction of the locking part 35 in the movable square hole 34.

[0052] refer to Figure 11 When the first expansion block 332 approaches the second expansion block 331, the first expansion block 332 pushes the second expansion block 331 to drive the locking part 35 to extend outward from the movable square hole 34 into the locking hole 320. The width of the movable square hole 34 is a, and the width of the second expansion block 331 is b, where a is less than b. The second expansion block 331 abuts against the inner wall of the interface tube 31 to limit the extension of the locking part 35 so that the locking part 35 stops when it is in the locked position. The part of the locking part 35 that protrudes from the movable square hole 34 is provided with a horizontal surface 321 and a vertical surface 322 that are perpendicular to each other. Both the horizontal surface 321 and the vertical surface 322 abut against the inner wall of the square tube 319. Two locking plates 323 are symmetrically arranged on the inner wall of the locking hole 320. The opposite sides of the two locking plates 323 abut against the locking part 35 to prevent the square tube 319 from disengaging from the interface tube 31.

[0053] The movable square hole 34 and the two guide plates 311 cooperate with each other to limit the position of the second expansion block 331 inside the interface tube 31, so that the second expansion block 331 and the first expansion block 332 form a diagonal tension. At this time, the inner wall of the square tube 319 is pressed against the horizontal surface 321 and the vertical surface 322 respectively. The inner wall of the square tube 319 is subjected to tension force in the vertical and horizontal directions, so that the inner wall of the square tube 319 is tightly attached to the outer wall of the interface tube 31. With the help of the two locking plates 323 to limit the locking part 35, the square tube 319 and the connecting device are tightly connected, which is not easy to loosen, greatly improving the stability of the connecting device and reducing safety hazards.

[0054] When the first expansion block 332 moves away from the second expansion block 331, the second expansion block 331 moves downward along the first inclined surface 38 to drive the locking part 35 out of the locking hole 320 and back to the inner cavity of the interface tube 31. The locking part 35 is in the unlocked position. The locking part 35 moves out of the locking hole 320 and completely separates from the locking plate 323 to unlock the square tube 319 and the connecting device, thereby realizing the rapid disassembly of the square tube 319 and the connecting device.

[0055] When users assemble or disassemble the square-mouth connector 30, no tools are required. Users can quickly assemble or disassemble it by simply turning the handwheel 316. The operation is convenient and improves the ease of assembling and disassembling the square-mouth connector 30 under limited outdoor conditions.

[0056] The first expansion block 332 has a through-hole 312 for the drive rod 333 to rotate. One end face of the first expansion block 332 has a mounting groove 314 that communicates with the rotating hole 312. Limiting members 313 are provided at both openings of the drive rod 333 corresponding to the rotating hole 312. The two limiting members 313 can be welded and fixed to the drive rod 333 to limit its rotation and prevent axial translation during rotation. The limiting members 313 also have gaskets 315 fitted onto the drive rod 333. The two gaskets 315 abut against the side wall of the second expansion block 331 and the inner wall of the mounting groove 314, respectively. The outer diameter of the gaskets 315 is larger than the inner diameter of the rotating hole 312 to increase the contact area of ​​the limiting members 313, reduce pressure, and thus ensure smoother rotation of the drive rod 333 within the rotating hole 312. The limiting member 313 can be a nut. The limiting member 313 is threadedly connected to the drive rod 333 to realize the detachable connection of the first expansion block 332 and the second expansion block 331. The washer 315 is used to prevent the nut from loosening.

[0057] The handwheel component 316 has a triangular hollow structure. The handwheel component 316 has an adjustment hole 317 through which the drive rod 333 passes. An adjustment nut 318 is provided in the adjustment hole 317. The end of the drive rod 333 that is screwed out of the mounting bracket 32 ​​is threadedly connected to the adjustment nut 318. The user can adjust the length of the drive rod 333 protruding from the handwheel component 316 by screwing the drive rod 333 into or out of the adjustment nut 318, thereby adjusting the preload between the first expansion block 332 and the second expansion block 331 when the square tube 319 and the connecting device are locked according to actual needs.

[0058] It should be noted that the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0059] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A one-piece frame, characterized in that, It includes a plastic wheel support for supporting bicycle wheels, a flip-locking device for flipping the plastic wheel support, and a square-mouth connecting device for connecting to an external vehicle. The plastic wheel support and the square-mouth connecting device are both connected to the bottom of the flip-locking device. The flip-locking device includes a lower bracket, an upper bracket, a flip structure, and a locking structure. The first end of the upper bracket is hinged to the first end of the lower bracket via the flip structure. The locking structure includes a pin and a locking member. The pin passes through the first and second ends of the upper bracket. The locking member is located at the second end of the upper bracket and has a locking hole through which the pin is inserted. The pin has a first limiting post. A drive frame is movably connected to the first end of the upper bracket. The top of the drive frame has a movable groove through which the pin moves. Both sides of the drive frame have limiting holes through which the first limiting post is movably connected. A drive section is formed at the bottom of the drive frame to drive the pin to extend and retract along its length in conjunction with the first limiting post. The pin and the locking hole cooperate to lock or unlock the upper bracket or the lower bracket. The drive section includes two bent plates. The drive frame and the drive section form an L-shaped structure, and a foot pedal is provided between the two bent plates. The square-mouth connecting device includes a square-mouth tube and a connecting device; a locking hole is provided through the diagonal of the square-mouth tube; the connecting device includes an interface tube, a mounting bracket, and a locking mechanism; the first end of the interface tube is connected to the mounting bracket, and the second end of the interface tube is provided with a movable square hole; the locking mechanism includes a first expansion block, a second expansion block, and a driving rod; the first expansion block is provided with a first inclined surface, and the second expansion block is provided with a second inclined surface and a locking part; the first inclined surface and the second inclined surface are fitted together; the first expansion block is slidably connected to the interface tube and rotatably connected to the driving rod; the mounting bracket is provided with a driving nut for threaded connection of the driving rod, so as to link the locking part to extend and retract within the movable square hole; the portion of the locking part exposed from the movable square hole is provided with a mutually perpendicular horizontal plane and a vertical plane; both the horizontal plane and the vertical plane abut against the inner wall of the square-mouth tube; two locking plates are symmetrically provided on the inner wall of the locking hole, and the opposite sides of the two locking plates abut against the locking part.

2. The integrated frame according to claim 1, characterized in that, The flipping structure includes two first hinge members and two second hinge members. The two first hinge members are respectively fixed to both sides of the first end of the upper bracket by bolts. The first hinge members are hinged to the first end of the lower bracket. The second hinge members include a connecting part and a travel part. The two connecting parts are hinged to the middle of the upper bracket and are symmetrically arranged. Two travel members are symmetrically arranged in the middle of the lower bracket. The travel part has a travel groove through it along the length direction for the travel members to slide and connect.

3. The integrated frame according to claim 1, characterized in that, The first end of the upper bracket is provided with a mounting bracket and a rotating shaft. The pin passes through the mounting bracket. The drive bracket has a first rotating hole through it below the limiting waist hole. The bottom of the mounting bracket has a second rotating hole through it. The rotating shaft is rotatably connected to the first rotating hole and the second rotating hole. The locking structure further includes a retaining mechanism, which acts between the first limiting post and the mounting bracket to allow the pin to extend outward from the second end of the upper bracket and be inserted into the locking hole. The retaining mechanism is a spring element, which is sleeved on the pin. A first abutting ring is sleeved on the pin at the position between the first limiting post and the mounting bracket. The two ends of the retaining mechanism abut against the opposite sides of the mounting bracket and the first abutting ring, respectively.

4. The integrated frame according to claim 1, characterized in that, Both the first inclined surface and the second inclined surface are parallel to the diagonal of the movable square hole corresponding to the inner cavity cross section of the square tube. The interface tube is a square tube structure. The movable square hole passes through any opposite corner of the inner wall of the interface tube. The inner wall of the interface tube abuts against the first expansion block at the other opposite corner of the movable square hole. Two guide plates are provided on the inner wall of the movable square hole. The two sides of the locking part abut against the two guide plates respectively.

5. The integrated frame according to claim 1, characterized in that, The first expansion block has a through-hole for the drive rod to rotate. The drive rod is provided with limiters at both openings of the rotation hole. The side wall of the first expansion block away from the mounting bracket has a mounting groove that communicates with the rotation hole. The limiters are provided with gaskets that are fitted onto the drive rod. The two gaskets abut against the side wall of the second expansion block and the inner wall of the mounting groove, respectively. The outer diameter of the gaskets is larger than the inner diameter of the rotation hole.

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