Self-locking folding structure and portable vehicle applying same

Abstract

The self-locking folding structure comprises a first folding seat and a second folding seat which are hinged to each other, the second folding seat is hinged to a locking handle through a second rotating shaft, one side of the first folding seat is provided with a protruding part, and the top of the protruding part is provided with a first limiting piece with the adjustable height; the supporting shaft is mounted on the inner side of the locking handle; the adjusting swing arm is rotatably arranged on the supporting shaft in a sleeving mode, one end of the adjusting swing arm is provided with a second limiting structure matched with the first limiting structure, and the other end of the adjusting swing arm is provided with a second limiting piece; the first reset device is connected between the adjusting swing arm and the locking handle and used for pushing the adjusting swing arm to turn over till the second limiting piece abuts against the inner wall of the locking handle, so that the second limiting structure keeps facing the first limiting structure. The reset torsional spring is arranged on the second rotating shaft in a sleeving mode, connected between the second folding base and the locking handle and used for pushing the locking handle to turn over towards the first folding base till the second limiting structure is matched with the first limiting structure.

Description

Technical Field

[0001] This utility model relates to the field of portable vehicle technology, and in particular to a self-locking folding structure and a portable vehicle using the same. Background Technology

[0002] The world is increasingly advocating energy conservation and emission reduction, and my country is undoubtedly a major producer of bicycles and electric vehicles, with various types of bicycles, electric vehicles, and scooters widely used. Among them, folding bikes have become a very important category of bicycles, electric vehicles, and scooters due to their advantages of being easy to carry and saving space.

[0003] Existing folding bicycles typically employ a double locking device at the upper and lower joints for folding safety. The first locking device usually consists of an adjustment structure located inside the locking handle and a positioning structure located at the lower joint. The second locking device typically consists of a latch installed on the locking handle and a locking pin located on the upper joint tube. When the locking handle is pulled upwards, the adjustment structure, positioning structure, latch, and locking pin work together to achieve double locking when the upper and lower joints are engaged.

[0004] However, the locking force of the first lock formed by the combination of the adjustment structure and the positioning structure in this traditional folding bicycle double locking device is limited. If the user is negligent or unfamiliar with the operation and fails to continue to pull the locking handle upward to perform the second lock after completing the first lock, the adjustment structure and the positioning structure may easily disengage during riding due to external impact, causing the first lock to fail and the upper and lower joints to unlock. If the user is riding on the seat at the top of the upper joint tube at this time, it may easily pose a hidden danger to their riding safety. Utility Model Content

[0005] This utility model proposes a self-locking folding structure and a portable bicycle using it, in order to solve the technical problem that the first locking force of the traditional double locking structure of the upper and lower joints used in existing folding bicycles is insufficient and that it is easy to cause safety hazards when riding.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides a self-locking folding structure, including a first folding seat and a second folding seat hinged to each other on one side via a first pivot. The second folding seat has a locking handle hinged to it on its opposite side (away from the first pivot) via the second pivot. The first folding seat has a protrusion on its side facing the second pivot, and a first height-adjustable limiting member is provided on the top of the protrusion (away from the second pivot). The first limiting member has a first limiting structure. The self-locking folding structure further includes:

[0008] The support shaft is installed on the inside of the locking handle;

[0009] An adjusting arm is rotatably sleeved on the outside of the support shaft. One end of the adjusting arm is provided with a second limiting structure that matches the first limiting structure, and the other end of the adjusting arm relative to the second limiting structure is provided with a second limiting member.

[0010] The first reset device is connected between the adjusting arm and the locking handle, and is used to push the adjusting arm to flip until the second limiting member abuts against the inner wall of the locking handle, so that the second limiting structure is restricted to a position facing the first limiting structure;

[0011] A reset torsion spring is sleeved on the second rotating shaft and connected between the second folding seat and the locking handle. It is used to push the locking handle to rotate toward the first folding seat until the second limiting structure and the first limiting structure fit together to lock the first folding seat and the second folding seat.

[0012] Preferably, the protrusion is cuboid in shape, and a pair of guide arc surfaces are provided on the top two sides of the protrusion facing away from the second folding seat. A pair of limiting steps matching the guide arc surfaces are provided on the inner walls of both sides of the locking handle. When the locking handle is close to the first folding seat and flipped, the limiting steps and guide arc surfaces guide the second limiting structure to fit snugly with the first limiting structure.

[0013] Preferably, the top surface of the protrusion is provided with a first mounting hole, and the first limiting member is an adjusting screw that matches the first mounting hole. The adjusting screw adjusts the height by engaging with the thread of the first mounting hole.

[0014] The first limiting structure is a first mating surface provided at the nut end of the adjusting screw, and the second limiting structure is a second mating surface that matches the first mating surface.

[0015] Furthermore, the self-locking folding structure also includes:

[0016] The second mounting hole is located on the side of the protrusion and connects to the first mounting hole;

[0017] The tightening screw, threaded into the second mounting hole, is used to tighten the adjusting screw to fix its height.

[0018] Preferably, the first mating surface is an arc-shaped convex surface, and the second mating surface is an arc-shaped concave surface.

[0019] Furthermore, the self-locking folding structure also includes:

[0020] The tube body is connected to the top of the first folding seat facing away from the second folding seat;

[0021] The third limiting component is installed on the side of the tube body facing the second rotating shaft, and the third limiting component is provided with a third limiting structure;

[0022] The movable latch is movably connected to the locking handle, and the movable latch is provided with a fourth limiting structure that matches the third limiting structure;

[0023] The second reset device is connected between the movable latch and the locking handle. It is used to make the fourth limiting structure fit snugly against the third limiting structure when the locking handle is close to the first folding seat and flipped, so that the movable latch fits snugly against the third limiting member.

[0024] Preferably, the third limiting member is a limiting screw installed on the side of the tube body facing the second rotating shaft, the third limiting structure is a third mating surface provided at the nut end of the limiting screw, and the fourth limiting structure is a fourth mating surface that matches the third mating surface.

[0025] Preferably, the movable latch includes:

[0026] First slider and second slider;

[0027] A connector, connecting the first slider and the second slider;

[0028] A wrench-shaped protrusion is located on the side of the first slider that faces away from the second slider.

[0029] A clearance groove is provided on the side of the second slider facing the limiting screw;

[0030] The fourth mating surface is located at the end of the second slider that faces away from the first slider;

[0031] The outer side of the locking handle is provided with a groove that matches the first slider, and the bottom of the groove is provided with a clearance groove that passes through the locking handle and matches the connector.

[0032] The second reset device is connected between the connector and the clearance slot;

[0033] The connector passes through the clearance groove, the first slider is movably abutted in the groove, and the second slider is movably abutted in the clearance groove through the inner side of the locking handle, so that the movable latch is movably connected to the locking handle.

[0034] Preferably, a pair of bearing seats are spaced apart on the opposite side of the second folding seat facing away from the first rotating shaft, and the second rotating shaft is rotatably connected between the pair of bearing seats. The bottom sides of the locking handle are respectively hinged to the second rotating shaft. A connecting part is connected between the bottom end of the pair of bearing seats away from the first folding seat and the outer side of the second folding seat. The connecting part and the pair of bearing seats form a limiting groove. The bottom of the locking handle is provided with a limiting block that matches the limiting groove.

[0035] When the locking handle is moved away from the first folding seat and flipped until the limit block and limit slot engage, the locking handle is limited to the maximum flipping angle position.

[0036] This utility model also provides a portable vehicle, including a base and the aforementioned self-locking folding structure, with a second folding seat mounted on the base.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The self-locking folding structure provided by this invention forms a strong first-level lock between the first and second folding seats. If the user, due to negligence or unfamiliarity with the operation, fails to engage the second-level lock by pulling the locking handle upwards after completing the first-level lock, the strong locking force of the first-level lock prevents the adjustment and positioning structures from disengaging during riding due to external impact, thus avoiding the unlocking of the upper and lower joints. This ensures that even if the user does not engage the second-level lock, there will be no significant safety hazard when riding on the seat at the top of the upper joint tube. Attached Figure Description

[0039] To more clearly illustrate the technical solution proposed by this utility model, the present utility model will be described in detail below with reference to the embodiments and accompanying drawings. It should be understood that the embodiments and accompanying drawings described in the following detailed description are merely some embodiments of this utility model, and those skilled in the art can make changes to these drawings under the concept of this utility model.

[0040] Figure 1 Schematic diagram of the assembly three-dimensional structure of an embodiment of the self-locking folding structure provided by this utility model Figure 1 ;

[0041] Figure 2 for Figure 1 An exploded three-dimensional structural diagram of the self-locking folding structure in the image;

[0042] Figure 3 Schematic diagram of the assembly three-dimensional structure of an embodiment of the self-locking folding structure provided by this utility model Figure 2 ;

[0043] Figure 4 for Figure 3 An exploded three-dimensional structural diagram of the self-locking folding structure in the image;

[0044] Figure 5 A schematic diagram of the assembly structure of an embodiment of the self-locking folding structure provided by this utility model;

[0045] Figure 6 A bottom view of the assembly structure of an embodiment of the self-locking folding structure provided by this utility model;

[0046] Figure 7 A three-dimensional structural diagram of the first limiting member and the fixing nut cooperating in the self-locking folding structure provided by this utility model;

[0047] Figure 8A front view of the self-locking folding structure provided by this utility model in the first locking state;

[0048] Figure 9 A front view of the self-locking folding structure provided by this utility model in the second locked state;

[0049] Figure 10 This is a front view schematic diagram of the self-locking folding structure provided by this utility model at the maximum flipping angle.

[0050] The main markings in the attached figures are as follows:

[0051] 1. First folding seat; 11. Protrusion; 111. First limiting member; 1111. First limiting structure; 112. Guide arc surface; 113. First mounting hole; 114. Second mounting hole; 115. Fixing nut; 12. Tube body; 121. Third limiting member; 1211. Third limiting structure; 2. Second folding seat; 21. Bearing seat; 22. Connecting part; 23. Limiting slot; 3. First rotating shaft; 4. Locking handle; 41. Limiting step; 42. Movable lock; 422. First slider ; 423, Second slider; 4231, Clearance groove; 4232, Fourth limiting structure; 4233, Second spring fixing post; 424, Connecting piece; 425, Wrench protrusion; 43, Second reset device; 44, Slide groove; 45, Clearance through groove; 46, Limiting block; 5, Second rotating shaft; 6, Support shaft; 61, Adjusting swing arm; 611, Second limiting structure; 612, First spring fixing post; 621, Second limiting piece; 7, First reset device; 8, Reset torsion spring; 9, Tightening screw. Detailed Implementation

[0052] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer, the following description is provided in conjunction with the appendix. Figure 1-10 The present invention will be further described in detail with reference to the embodiments.

[0053] Please refer to the following: Figure 1-10 The self-locking folding structure provided by this utility model includes a first folding seat 1 and a second folding seat 2 hinged to each other on one side by a first pivot 3. The second folding seat 2 is hinged to the bottom of the locking handle 4 on the opposite side away from the first pivot 3 by a second pivot 5. During assembly, the first folding seat 1 is on top and the second folding seat 2 is on the bottom, with the top surface of the second folding seat 2 facing the bottom surface of the first folding seat 1. The first folding seat 1 can rotate up and down around the first pivot 3 above the second folding seat 2, moving closer to or away from the second folding seat 2, to achieve the locking or unlocking action between the first folding seat 1 and the second folding seat 2.

[0054] The first folding seat 1 has a protrusion 11 on the side facing the second rotating shaft 5 (i.e., relative to the first rotating shaft 3). The protrusion 11 has a first limiting member 111 with adjustable height (i.e., can extend and retract relative to the top surface of the second folding seat 2) on the top of the back of the second folding seat 2. The first limiting member 111 has a first limiting structure 1111.

[0055] The self-locking folding structure also includes:

[0056] A support shaft 6 is installed inside the locking handle 4; an adjusting arm 61 is rotatably sleeved on the outside of the support shaft 6 along the outer side of the support shaft 6, one end of the adjusting arm 61 is provided with a second limiting structure 611 that matches the first limiting structure 1111, and the other end of the adjusting arm 61 relative to the second limiting structure 611 is provided with a second limiting member 621; a first reset device 7 is connected between the adjusting arm 61 and the locking handle 4, used to push the adjusting arm 61 to flip until the second limiting member 621 abuts against the inner wall of the locking handle 4, so that the other end of the adjusting arm 61 relative to the second limiting member 621 is tilted up, thereby restricting the second limiting structure 611 to maintain a position facing the first limiting structure 1111;

[0057] A reset torsion spring 8 is sleeved on the second rotating shaft 5, and its two ends are connected between the second folding seat 2 and the locking handle 4. It is used to release the stored energy of the reset torsion spring 8 during the downward flipping of the locking handle 4 after the first folding seat 1 and the second folding seat 2 are fastened together and the user pulls the locking handle 4 downward toward the first folding seat 1 to flip it over and release the locking handle 4. This pushes the locking handle 4 toward the first folding seat 1 to flip (i.e., flip upward) until the second limiting structure 611 and the first limiting structure 1111 fit closely together to lock the first folding seat 1 and the second folding seat 2. At this time, the self-locking folding structure achieves the first locking.

[0058] In the first locked state of the self-locking folding structure, the user pulls the locking handle 4 downwards towards the first folding seat 1 and flips it until the second limiting structure 611 disengages from the first limiting structure 1111, thereby unlocking the first folding seat 1 and the second folding seat 2. At this time, the user can move the first folding seat 1 downwards around the first pivot 3 to first disengage and then move it away from and then towards the second folding seat 2 until the first folding seat 1 abuts against the second folding seat 2, thus realizing the folding and storage of the self-locking folding structure. In the folded state of the self-locking folding structure, the user pushes the first folding seat 1 in the opposite direction around the first pivot 3, first moving it away from and then towards the second folding seat 2 until the first folding seat 1 and the second folding seat 2 re-engage and the locking handle 4 is pushed back to its original position.

[0059] Please refer to the following: Figure 1-48-10 In this embodiment, the protrusion 11 is cuboid in shape. A pair of guide arc surfaces 112 are provided on the two sides of the top edge of the protrusion 11 facing away from the second folding seat 2. A pair of limiting steps 41 matching the guide arc surfaces 112 are provided on the inner walls of both sides of the locking handle 4. When the locking handle 4 is close to the first folding seat 1 and flips upward, the limiting steps 41 cooperate with the guide arc surfaces 112, and under the adjustment of the flipping posture of the adjusting arm 61 by the first reset device 7, the second limiting structure 611 is guided to fit closely with the first limiting structure 1111. Thus, the self-locking folding structure has sufficient locking force in the first locking state through the close cooperation of the limiting steps 41 and the guide arc surfaces 112, and the second limiting structure 611 and the first limiting structure 1111.

[0060] Please refer to the following: Figure 1-4 8-10 In this embodiment, the top surface of the protrusion 11 is provided with a first mounting hole 113, and the first limiting member 111 is an adjusting screw that matches the first mounting hole 113. The adjusting screw is threadedly engaged with the first mounting hole 113, so that the adjusting screw can extend and retract relative to the top surface of the second folding seat 2, thereby adjusting the height of the adjusting screw extending upward from the top surface of the protrusion 11.

[0061] When the self-locking folding structure is applied to a folding bicycle, the connection and assembly position between the adjusting arm 61 and the support shaft 6, the first reset device 7 and the adjusting arm 61, and the locking handle 4 may deviate due to external impact during riding. At this time, the height of the adjusting screw (first limiting member 111) can be conveniently adjusted in the above manner to correct the above deviation, ensuring that the second limiting structure 611 and the first limiting structure 1111 can fit together properly, and avoiding the failure of the self-locking folding structure to lock.

[0062] Please refer to the following: Figure 1-4 8-10 In this embodiment, the first limiting structure 1111 is a first mating surface provided at the nut end of the adjusting screw, and the second limiting structure 611 is a second mating surface that matches the first mating surface.

[0063] Please refer to the following: Figure 1-4 8-10 In a preferred embodiment of this example, the adjusting screw (first limiting member 111) is a ball head screw, the first mating surface (first limiting structure 1111) is an arc-shaped convex surface, and the second mating surface (second limiting structure 611) is an arc-shaped concave surface.

[0064] Please refer to the following: Figure 1-4 8-10 In other embodiments of this example, the first mating surface (first limiting structure 1111) may also be an arc-shaped concave surface, and the second mating surface (second limiting structure 611) may be an arc-shaped convex surface.

[0065] Please refer to the following: Figure 1-4 In a more preferred embodiment of this invention, the adjusting arm 61 is elongated, with one end of the adjusting arm 61 having the aforementioned second mating surface (second limiting structure 611). The second limiting member 621 is a cuboid-shaped limiting block located at the other end of the adjusting arm 61. The adjusting arm 61 has a hinge hole near the limiting block (second limiting member 621) for hinged connection with the support shaft 6. The adjusting arm 61, through the hinge hole, engages with the support shaft 6 and can be rotatably fitted onto the outer side of the support shaft 6. A first spring fixing post 612 is located on one side of the adjusting arm 61 near the second mating surface (second limiting structure 611). The first reset device 7 is a first reset spring. One end of the first reset spring (first reset device 7) is fitted onto the first spring fixing post 612 and abuts against the adjusting arm 61, while the other end abuts against the inner wall of the locking handle 4.

[0066] The first reset spring (first reset device 7) is used to push and flip the adjusting arm 61 so that the second limiting member 621 abuts against the inner wall of the locking handle 4, so that the line connecting the second mating surface (second limiting structure 611) and the support shaft 6 forms an angle with respect to the locking handle 4. Thus, when the locking handle 4 is flipped closer to the first folding seat 1, if the second limiting structure 611 and the first limiting structure 1111 are not in place, the adjusting arm 61 is pulled and flipped by the action of the second mating surface (second limiting structure 611) and the first mating surface (first limiting structure 1111) so that the second limiting member 621 disengages and gradually leaves the inner wall of the locking handle 4. At the same time, the second mating surface (second limiting structure 611) is always restricted to a position facing the first limiting structure 1111, thereby ensuring that the second mating surface (second limiting structure 611) and the first mating surface (first limiting structure 1111) fit snugly together.

[0067] In other embodiments of this example, the first reset device 7 may also be a first reset spring.

[0068] Please refer to the following: Figure 1-4 8-10, In a preferred embodiment of this invention, the self-locking folding structure further includes:

[0069] The second mounting hole 114 is located on the side of the protrusion 11 and communicates with the first mounting hole 113; the tightening screw 9 is threaded into the second mounting hole 114 and is used to tighten the adjusting screw to fix the height of the adjusting screw relative to the second folding seat 2.

[0070] Please refer to the following: Figure 1-4 In a more preferred embodiment of this example, the second mounting hole 114 is perpendicular to the first mounting hole 113.

[0071] Please see Figure 7 In another embodiment of this example, the first mounting hole 113 is a through hole that passes through the protrusion 11 from top to bottom. The bottom end of the first mounting hole 113 is connected to the bottom surface of the protrusion 11 facing away from the first folding seat 1 and is provided with a nut fixing groove. A fixing nut 115 is embedded in the nut fixing groove. The adjusting screw (first limiting member 111) is threadedly engaged with the fixing nut 115 to achieve height adjustment. The adjusting screw is fixed by tightening the adjusting screw with the tightening screw 9 to fix the height of the adjusting screw relative to the second folding seat 2.

[0072] In other embodiments of this example, the first limiting member 111 is an adjusting pin, the shank of which is a square prism, hexagonal prism, or polygonal prism, and the first mounting hole 113 is a smooth hole. The aforementioned tightening screw 9 is used to abut against the flat prism side of the adjusting pin to fix the height of the adjusting screw relative to the second folding seat 2.

[0073] Please refer to the following: Figure 1-4 8-10, In this embodiment, the self-locking folding structure further includes:

[0074] The tube body 12 is connected to the top of the first folding seat 1 facing away from the second folding seat 2; the third limiting member 121 is installed on the side of the tube body 12 facing the second rotating shaft 5 (i.e., relative to the first rotating shaft 3), and the third limiting member 121 is provided with a third limiting structure 1211; the movable latch 42 is movably connected to the locking handle 4, and the movable latch 42 is provided with a fourth limiting structure 4232 that matches the third limiting structure 1211; the second reset device 43 is connected between the movable latch 42 and the locking handle 4, and is used to make the fourth limiting structure 4232 fit snugly against the third limiting structure 1211 when the locking handle 4 is close to the first folding seat 1 and flipped, so that the movable latch 42 fits snugly against the third limiting member 121.

[0075] Specifically, when the first folding seat 1 and the second folding seat 2 are engaged and the locking handle 4 is close to the tube body 12, the movable lock 42 engages with the third limiting member 121. Based on the first locking mechanism, the movable lock 42 and the third limiting member 121 work together to form a second locking mechanism for engaging the first folding seat 1 and the second folding seat 2, thereby further improving the safety and stability of the self-locking folding structure when the user is riding. When the movable lock 42 is moved away from the third limiting member 121, the movable lock 42 disengages from the third limiting member 121, thereby unlocking the second locking mechanism for engaging the first folding seat 1 and the second folding seat 2.

[0076] Please refer to the following: Figure 1-48-10 In this embodiment, the third limiting member 121 is a limiting screw installed on the side of the tube body 12 facing the second rotating shaft 5, the third limiting structure 1211 is a third mating surface that is tapered and inclined at the nut end of the limiting screw, and the fourth limiting structure 4232 is a fourth mating surface that matches the third mating surface and is tapered and inclined.

[0077] Please refer to the following: Figure 1-4 8-10 In the preferred embodiment of this embodiment, the third mating surface (third limiting structure 1211) is an arc-shaped convex surface, and the fourth mating surface (fourth limiting structure 4232) is an arc-shaped concave surface.

[0078] In other embodiments of this example, the third mating surface (third limiting structure 1211) may also be an arc-shaped concave surface, and the fourth mating surface (fourth limiting structure 4232) may be an arc-shaped convex surface.

[0079] Please refer to the following: Figure 1-4 8-10, In a preferred embodiment of this practice, the movable latch 42 includes:

[0080] A first slider 422 and a second slider 423 are spaced apart; a connector 424 connects the first slider 422 and the second slider 423; a protruding wrench is located on the side of the first slider 422 facing away from (i.e. away from) the second slider 423; a clearance groove 4231 is located on the side of the second slider 423 facing the limiting screw; the aforementioned fourth mating surface (fourth limiting structure 4232) is located at the end of the second slider 423 facing away from the first slider 422; the outer side of the locking handle 4 is provided with a mating surface with the first slider 422. A sliding groove 44 is matched with a slider 422. The bottom of the sliding groove 44 is provided with a clearance groove 45 that passes through the locking handle 4 and matches the connector 424. A second reset device 43 is connected between the connector 424 and the clearance groove 45. The connector 424 passes through the clearance groove 45. The first slider 422 is movably abutted in the sliding groove 44. The second slider 423 is movably abutted in the clearance groove 45 at the inner side of the locking handle 4, so that the movable slider is movably connected to the locking handle 4.

[0081] When the first folding seat 1 and the second folding seat 2 are engaged and the locking handle 4 is close to the tube body 12, under the adjustment of the second reset device 43, the fourth mating surface (fourth limiting structure 4232) slides along the third mating surface (third limiting structure 1211) until the fourth mating surface (fourth limiting structure 4232) completely passes over the third mating surface (third limiting structure 1211), so that the nut end of the limiting screw (third limiting member 121) extends into the relief groove 4231, so that the back of the limiting screw (third limiting member 121) facing away from the third mating surface cooperates with the inner wall of the relief groove 4231, thereby limiting the locking handle 4 and making the self-locking folding structure achieve a second locking.

[0082] When the protruding wrench is moved away from the limiting screw (third limiting member 121), the first slider 422 simultaneously slides along the slide groove 44 away from the limiting screw (third limiting member 121). At the same time, the second slider 423 slides along the clearance groove 45 through the inner side of the locking handle 4 away from the positioning slot. Simultaneously, the connecting member 424 moves away from the limiting screw (third limiting member 121) within the clearance groove 45 along with the first slider 422 and the second slider 423, causing the movable latch 42 to move away from the limiting screw (third limiting member 121) as a whole. Until the nut end of the limiting screw (third limiting member 121) disengages from the relief groove 4231, the second locking of the first folding seat 1 and the second folding seat 2 is unlocked. At this point, the locking handle 4 can be rotated around the second pivot 5 until the second limiting structure 611 disengages from the first limiting structure 1111, thus unlocking the first locking of the first folding seat 1 and the second folding seat 2. At this point, the first folding seat 1 can be rotated outwards relative to the second folding seat 2 around the first pivot 3, so that the two are completely unlocked from the locked state and converted to an open folded / storage state. Simply loosen the end of the protruding wrench located outside the locking handle 4, and the protruding wrench will automatically reset under the action of the return torsion spring 8.

[0083] Please refer to the following: Figure 1-4 In a more preferred embodiment of this invention, a second spring fixing post 4233 is provided at the connection between the connector 424 and the second slider 423. The second reset device 43 is a second reset spring. One end of the second reset spring abuts against the inner surface of the clearance groove 45, and the other end of the second reset spring is sleeved on the second spring fixing post 4233 and abuts against the connection between the connector 424 and the second slider 423.

[0084] In other embodiments of this example, the second reset device 43 may also be a second reset spring.

[0085] Please refer to the following: Figure 1-48-10 In a preferred embodiment of this example, the third limiting member 121 is fastened to the outside of the tube body 12 by screws, or the third limiting member 121 can also be integrally formed with the tube body 12.

[0086] Please refer to the following: Figure 1-4 8-10 In this embodiment, the second folding seat 2 is provided with a pair of bearing seats 21 spaced apart on the opposite side from the first rotating shaft 3. The second rotating shaft 5 is rotatably connected between the pair of bearing seats 21. The bottom sides of the locking handle 4 are respectively hinged to the second rotating shaft 5. A connecting part 22 is connected between the bottom end of the pair of bearing seats 21 away from the first folding seat 1 and the outer side of the second folding seat 2. The connecting part 22 and the pair of bearing seats 21 form a limiting groove 23. The bottom of the locking handle 4 is provided with a limiting block 46 that matches the limiting groove 23.

[0087] When the user moves the locking handle 4 away from the first folding seat 1 and flips it until the limit block 46 engages with the limit slot 23, the locking handle 4 is limited to the maximum flip angle position relative to the first folding seat 1. This prevents the reset torsion spring 8 from being damaged or failing to reset due to excessive stretching caused by the excessive flip angle of the locking handle 4 relative to the first folding seat 1.

[0088] Please refer to the following: Figure 1-4 8-10 In a preferred embodiment of this example, the second rotating shaft 5 can be an integral rotating shaft that is rotatably inserted into the corresponding bearing holes of a pair of bearing seats 21, or it can be a pair of rotating pins that are rotatably inserted into the corresponding bearing holes of a pair of bearing seats 21, and the bottom sides of the locking handle 4 are respectively hinged to the pair of rotating pins.

[0089] Please refer to the following: Figure 1-4 In a more preferred embodiment of this invention, the limiting block 46 is hook-shaped. One end of the limiting block 46 is connected to the bottom of the locking handle 4, and the other end (i.e., the end) of the limiting block 46 is bent and extended away from the locking handle 4 and closer to the second folding seat 2. While the reset torsion spring 8 is sleeved on the second rotating shaft 5, one end of the reset torsion spring 8 is respectively abutted in the corresponding fixing holes of a pair of bearing seats 21 through two connecting feet. The other end of the reset torsion spring 8 is sleeved in the middle bend of the hook-shaped limiting block 46 through a U-shaped bend.

[0090] This utility model also provides a portable vehicle, including a base and the aforementioned self-locking folding structure, with a second folding seat 2 mounted on the base.

[0091] In one embodiment of this invention, the portable vehicle also includes a seat cushion mounted on the top of the tube 12 at the top of the first folding seat 1.

[0092] In another embodiment of this invention, the portable vehicle also includes a handlebar, which is mounted on the top of the tube 12 at the top of the first folding seat 1.

[0093] As a preferred embodiment of this practice, the portable vehicle is a bicycle, scooter, electric vehicle, folding vehicle, or wheelchair.

[0094] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Those skilled in the art should understand that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-locking folding structure, comprising a first folding seat (1) and a second folding seat (2) hinged to each other on one side via a first pivot (3), wherein the second folding seat (2) is hinged to a locking handle (4) on the opposite side facing away from the first pivot (3) via a second pivot (5), characterized in that, The first folding seat (1) has a protrusion (11) on the side facing the second pivot (5). The protrusion (11) has an adjustable height first limiting member (111) on the top facing away from the second folding seat (2). The first limiting member (111) has a first limiting structure (1111). The self-locking folding structure further includes: A support shaft (6) is installed on the inside of the locking handle (4); An adjusting arm (61) is rotatably sleeved on the outside of the support shaft (6). One end of the adjusting arm (61) is provided with a second limiting structure (611) that matches the first limiting structure (1111), and the other end of the adjusting arm (61) relative to the second limiting structure (611) is provided with a second limiting member (621). The first reset device (7) is connected between the adjusting arm (61) and the locking handle (4) to push the adjusting arm (61) to flip to the second limiting member (621) abutting against the inner wall of the locking handle (4), so that the second limiting structure (611) is restricted to a position facing the first limiting structure (1111); A reset torsion spring (8) is sleeved on the second rotating shaft (5) and connected between the second folding seat (2) and the locking handle (4). It is used to push the locking handle (4) to flip toward the first folding seat (1) until the second limiting structure (611) and the first limiting structure (1111) fit together to lock the first folding seat (1) and the second folding seat (2).

2. The self-locking folding structure as described in claim 1, characterized in that, The protrusion (11) is rectangular. A pair of guide arc surfaces (112) are provided on the two sides of the top edge of the protrusion (11) facing away from the second folding seat (2). A pair of limiting steps (41) matching the guide arc surfaces (112) are provided on the inner walls of both sides of the locking handle (4). When the locking handle (4) is close to the first folding seat (1) and flips, the limiting steps (41) and the guide arc surfaces (112) cooperate to guide the second limiting structure (611) to fit snugly with the first limiting structure (1111).

3. The self-locking folding structure as described in claim 2, characterized in that, The top surface of the protrusion (11) is provided with a first mounting hole (113), and the first limiting member (111) is an adjusting screw that matches the first mounting hole (113). The adjusting screw adjusts the height by threading with the first mounting hole (113). The first limiting structure (1111) is a first mating surface provided on the nut end of the adjusting screw, and the second limiting structure (611) is a second mating surface that matches the first mating surface.

4. The self-locking folding structure as described in claim 3, characterized in that, Also includes: The second mounting hole (114) is provided on the side of the protrusion (11) and communicates with the first mounting hole (113); A clamping screw (9) is threaded into the second mounting hole (114) and is used to clamp the adjusting screw to fix the height of the adjusting screw.

5. The self-locking folding structure as described in claim 3, characterized in that, The first mating surface is an arc-shaped convex surface, and the second mating surface is an arc-shaped concave surface.

6. The self-locking folding structure as described in any one of claims 1-5, characterized in that, Also includes: The tube body (12) is connected to the top of the first folding seat (1) facing away from the second folding seat (2); The third limiting member (121) is installed on the side of the tube body (12) facing the second rotating shaft (5), and the third limiting member (121) is provided with a third limiting structure (1211); A movable latch (42) is movably connected to the locking handle (4), and the movable latch (42) is provided with a fourth limiting structure (4232) that matches the third limiting structure (1211); The second reset device (43) is connected between the movable latch (42) and the locking handle (4) and is used to make the fourth limiting structure (4232) fit snugly against the third limiting structure (1211) when the locking handle (4) is close to the first folding seat (1) and flipped, so that the movable latch (42) fits snugly against the third limiting member (121).

7. The self-locking folding structure as described in claim 6, characterized in that, The third limiting member (121) is a limiting screw installed on the side of the tube body (12) facing the second rotating shaft (5), the third limiting structure (1211) is a third mating surface provided on the nut end of the limiting screw, and the fourth limiting structure (4232) is a fourth mating surface that matches the third mating surface.

8. The self-locking folding structure as described in claim 7, characterized in that, The movable latch (42) includes: First slider (422) and second slider (423); A connector (424) is connected between the first slider (422) and the second slider (423); A wrench protrusion (425) is provided on the side of the first slider (422) facing away from the second slider (423); A clearance groove (4231) is provided on the side of the second slider (423) facing the limiting screw; The fourth mating surface is located at the end of the second slider (423) facing away from the first slider (422); The outer side of the locking handle (4) is provided with a groove (44) that matches the first slider (422), and the bottom of the groove (44) is provided with a clearance groove (45) that passes through the locking handle (4) and matches the connector (424). The second reset device (43) is connected between the connector (424) and the clearance groove (45); The connector (424) passes through the relief groove (45), the first slider (422) is movably abutted in the groove (44), and the second slider (423) is movably abutted in the relief groove (45) through the inner side of the locking handle (4), so that the movable latch (42) is movably connected to the locking handle (4).

9. The self-locking folding structure as described in claim 8, characterized in that, The second folding seat (2) has a pair of bearing seats (21) spaced apart on the opposite side from the first rotating shaft (3). The second rotating shaft (5) is rotatably connected between the pair of bearing seats (21). The bottom sides of the locking handle (4) are respectively hinged to the second rotating shaft (5). A connecting part (22) is connected between the bottom end of the pair of bearing seats (21) away from the first folding seat (1) and the outer side of the second folding seat (2). The connecting part (22) and the pair of bearing seats (21) form a limiting groove (23). The bottom of the locking handle (4) is provided with a limiting block (46) that matches the limiting groove (23). When the locking handle (4) is moved away from the first folding seat (1) and flipped until the limiting block (46) and the limiting slot (23) are engaged, the locking handle (4) is limited to the position of the maximum flip angle.

10. A portable vehicle, comprising a base, characterized in that, It also includes a self-locking folding structure as described in any one of claims 1-9, wherein the second folding seat (2) is mounted on the base.

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