Folding secondary safety structure and portable vehicle

Abstract

The utility model provides a folding secondary safety structure and a portable vehicle, the folding secondary safety structure comprises a first joint and a second joint which are hinged through a first rotating shaft, and one side, opposite to the first rotating shaft, of the second joint is hinged with a locking handle through a second rotating shaft; the first safety device and the second safety device are used for locking the first connector and the second connector; the first safety device comprises a clamping groove and a limiting shaft mounted in the clamping groove; the eccentric wheel mechanism comprises an eccentric wheel which is sleeved on the second rotating shaft; the rotary clamping hook comprises a wheel sleeve end connected with the eccentric wheel in a sleeved mode, a clamping part which extends out in the radial direction of the wheel sleeve end and is provided with a clamping opening matched with the limiting shaft, and an adjusting piece capable of stretching out and drawing back on the inner surface of the clamping opening. The first reset piece is connected between the rotary clamping hook and the second connector and used for driving the rotary clamping hook to turn over close to the first connector so that the rotary clamping hook can be reset to the clamping hook initial state extending upwards, and when the first connector and the second connector are buckled, the limiting shaft is driven to be matched with the clamping opening and the adjusting piece in a clamped mode so as to lock the first safety device.

Description

Technical Field

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

[0002] The world is advocating energy conservation and emission reduction, and my country is undoubtedly a major country in bicycles and electric vehicles, with various types of bicycles, electric vehicles, and scooters being widely used. Among them, folding bikes have become a very important type of bicycle, electric vehicle, and scooter due to their advantages of being easy to carry and taking up little space, and they are becoming increasingly popular.

[0003] To address the issue of potential danger to users of folding bicycles due to mis-locking in folding structures with only single-lock capability, existing technology provides a folding structure with dual-lock capability. This structure includes a first folding seat and a second folding seat positioned vertically. The first and second folding seats are rotatably connected on one side via a first pivot. The second folding seat, on the opposite side of the first pivot, is hinged to a locking handle via a second pivot. An eccentric wheel mechanism, serving as a first safety device, is mounted on the second pivot, and a locking mechanism, serving as a second safety device, is mounted on the locking handle. A limiting groove is provided on the side of the first folding seat facing the second pivot, and a reset member connects between the locking handle and the second folding seat. This reset member drives the locking handle to rotate near the first connector, causing the rotating hook of the eccentric wheel mechanism to rotate upwards until both the locking handle and the rotating hook return to their initial upward-extending state. At this point, the first and second folding seats are engaged, causing the limiting groove to move downwards past the limiting cap at the top of the rotating hook until the top surface of the limiting groove engages with the bottom surface of the limiting cap, thereby locking the first safety device. Finally, the locking mechanism is engaged with the corresponding structure of the stem on the top of the first folding seat to lock the second safety device.

[0004] Although this folding structure has a double-locking capability, the eccentric wheel mechanism, which is used to cooperate with the second rotating shaft, and the rotating hook connected to the eccentric wheel are easily subjected to external impacts during the riding of the folding bike. This can cause a certain degree of misalignment in the assembly of the eccentric wheel and the rotating hook, affecting the positional accuracy of the limiting end cap when the rotating hook returns to its initial upward extension state. Consequently, when the first folding seat and the second folding seat are fastened together, it is difficult for the top surface of the limiting groove and the bottom surface of the limiting end cap to fit precisely, which poses a risk of failure for the first safety device.

[0005] Furthermore, since the locking handle and rotating hook are both driven to return to their initial upward-extending state by a reset component, when the first folding seat and the second folding seat are fastened together, the first folding seat needs to push the locking handle close to the second folding seat and flip it downward to overcome its resistance until the locking handle is fully pushed open before the fastening can be completed. This makes the fastening operation of the first folding seat and the second folding seat inconvenient, time-consuming and laborious, and reduces the user experience. Utility Model Content

[0006] This utility model proposes a folding secondary safety structure and a portable bicycle to solve the technical problem that the eccentric wheel mechanism of the traditional folding structure is easily subjected to external impact during the riding of the folding bicycle, which causes the positional accuracy of its limiting end cap to decrease, and the bottom surface of the limiting end cap is difficult to fit closely with the top surface of the limiting groove when the upper and lower folding seats are fastened, resulting in locking failure.

[0007] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0008] This utility model provides a folding secondary safety structure, including a first connector and a second connector hinged together by a first pivot. The second connector is hinged to a locking handle on the opposite side of the first pivot via the second pivot. A first safety device and a second safety device are used to lock the first and second connectors. The first safety device is used to maintain the first and second connectors interlocked when the second safety device fails. The first safety device includes:

[0009] A slot is provided on the other side of the first connector opposite to the hinged side with the second connector;

[0010] The limiting shaft is installed on the inside of the slot;

[0011] The eccentric wheel mechanism includes: an eccentric wheel sleeved on a second rotating shaft; a rotating hook including a sleeve end sleeved with the eccentric wheel, a locking part extending radially from the sleeve end, the locking part having a slot matching the shape of the limiting shaft, and an adjusting member telescopically connected to the inner surface of the slot for adjusting the size of the slot to fit snugly to the limiting shaft;

[0012] The first reset component is connected between the rotating hook and the second connector;

[0013] The first reset component is used to drive the rotating hook to rotate as the eccentric wheel approaches the first connector, so that the rotating hook is reset to the initial state of the hook extending upward. When the first connector and the second connector are engaged, the limiting shaft engages with the bayonet and the adjusting component, thereby locking the first safety device.

[0014] Preferably, the engaging portion includes:

[0015] An extension section extends radially from the end of the wheel sleeve, and a snap-fit ​​section is connected to the end of the extension section away from the end of the wheel sleeve. A snap-fit ​​opening is formed between the extension section and the snap-fit ​​section, and an adjusting member is telescopically and movably connected to the inner surface of the snap-fit ​​section facing the snap-fit ​​opening.

[0016] Preferably, the snap-fit ​​section is provided with a threaded through hole that connects to the snap-fit ​​opening, and the adjusting element is an adjusting screw that matches the threaded through hole. The adjusting screw is telescopically connected to the inner surface of the snap-fit ​​opening by cooperating with the threaded through hole.

[0017] Furthermore, the first safety device also includes:

[0018] The first limiting structure is located at the end of the wheel sleeve;

[0019] The second limiting structure is provided on the locking handle in a manner that matches the first limiting structure;

[0020] Move the locking handle away from the first connector and rotate it until the second limiting structure contacts the first limiting structure and drives the rotating hook to rotate away from the initial state of the hook along with the eccentric wheel away from the first connector, so that the latch disengages from the limiting shaft and unlocks the first safety device.

[0021] Furthermore, the first safety device also includes:

[0022] The second reset component is connected between the locking handle and the second connector. It is used to drive the locking handle away from the first connector and rotate it so that the locking handle is reset to the initial state of the handle at an angle to the vertical direction. The size of the angle can make way for the locking handle to make way for the first connector and the second connector to engage.

[0023] Preferably, the included angle ranges from 30 to 60 degrees.

[0024] Preferably, in the initial state of the handle, the locking handle is just flipped so that the bayonet disengages from the limiting shaft.

[0025] The second limiting structure contacts the first limiting structure and drives the rotating hook to rotate away from its initial state as the eccentric wheel moves away from the first connector, causing the latch to disengage from the limiting shaft and unlocking the first safety device.

[0026] Preferably, a pair of first protrusions are provided on the side of the first connector opposite to the hinge side of the second connector, and the pair of first protrusions and the first connector form a groove. The first protrusions are provided with mounting holes that match the shape of the limiting shaft, and the two ends of the limiting shaft are respectively inserted into the corresponding mounting holes of the pair of first protrusions.

[0027] Preferably, in the initial state, the hook is rotated back to its original position so that it extends vertically upwards and the top surface of the latch remains parallel to the horizontal plane;

[0028] When the first connector and the second connector are engaged, the top surface of the first protrusion is parallel to the horizontal plane.

[0029] This utility model also provides a portable vehicle, including a base and a handlebar, and also includes the above-mentioned folding secondary safety structure, with the handlebar mounted on the first connector.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The folding secondary safety structure provided by this utility model, because the adjusting component is telescopically connected to the inner surface of the latch, allows the user to adjust the telescopic length of the adjusting component relative to the inner surface of the latch during the riding of the folding bicycle. This alters the contact surface size formed by the contour of the inner surface of the latch and the outer contour of the adjusting component's end protruding from the inner surface of the latch (i.e., changes the depth of the adjusting component's end relative to the latch). This adjusts the latch to re-fit the limiting shaft, correcting the latch misalignment caused by external impact. It ensures the positional accuracy of the limiting end cap when the rotating hook returns to its initial upward extension state, maintaining a precise fit between the latch and the limiting shaft when the first and second folding seats are engaged. This avoids the risk of the first safety device failing due to latch misalignment caused by external impact. Attached Figure Description

[0032] 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.

[0033] Figure 1 A three-dimensional structural diagram of the secondary locking state of an embodiment of the folding secondary safety structure provided by this utility model;

[0034] Figure 2 A schematic diagram of the secondary locking state of an embodiment of the folding secondary safety structure provided by this utility model;

[0035] Figure 3 for Figure 2 A cross-sectional schematic diagram of the folded secondary safety structure in the diagram;

[0036] Figure 4 A three-dimensional structural diagram of the first-locking state of an embodiment of the folding secondary safety structure provided by this utility model;

[0037] Figure 5 for Figure 4 A schematic diagram of the exploded structure of the folded secondary safety structure in the image;

[0038] Figure 6 A schematic diagram of the primary locking state of an embodiment of the folding secondary safety structure provided by this utility model;

[0039] Figure 7 for Figure 6 A cross-sectional schematic diagram of the folded secondary safety structure.

[0040] The main markings in the attached figures are as follows:

[0041] 1. First connector; 11. Slot; 111. Limiting shaft; 12. First protrusion; 13. Stem; 14. Locking limiting structure; 141. Limiting component; 1411. Limiting groove; 1412. Second guide cone surface; 2. Second connector; 21. Second protrusion; 211. Fourth limiting structure; 3. First rotating shaft; 4. Second rotating shaft; 5. Locking handle; 51. Second limiting structure; 6. Eccentric wheel mechanism; 61. Eccentric wheel; 611. Shaft hole; 62. Rotation 621. Hook; 621. Wheel sleeve end; 6211. First limiting structure; 622. Engaging part; 6220. Bayonet; 6221. Extension section; 6222. Engaging section; 6223. Adjusting component; 6224. Threaded through hole; 623. Third limiting structure; 7. First reset component; 8. Second reset component; 9. Movable locking mechanism; 91. Sliding channel; 92. Slider; 921. Handle; 93. Movable component; 931. First guide cone surface; 94. Third reset component. Detailed Implementation

[0042] Please refer to the following: Figure 1-7 The folding secondary safety structure provided by this utility model includes a first connector 1 and a second connector 2 that are hinged together by a first pivot 3 and arranged vertically. The second connector 2 is hinged to a locking handle 5 on the other side of the first pivot 3 by a second pivot 4, which is used to lock the first safety device and the second safety device of the first connector 1 and the second connector 2. The first safety device is used to keep the first connector 1 and the second connector 2 locked together when the second safety device fails. At this time, the folding secondary safety structure is in a single-lock state.

[0043] When the first safety device and the second safety device are both in effect, the folding secondary safety structure is in a double-locked state, at which time the first connector 1 and the second connector 2 are locked together.

[0044] When both the first and second safety devices fail, the folding secondary safety structure is in the unlocked state, at which point the first connector 1 and the second connector 2 can be separated and opened.

[0045] Please refer to the following: Figure 1-7 In this embodiment, the first safety device includes:

[0046] A slot 11 is located on the side of the first connector 1 opposite to the hinged side with the second connector 2; a limiting shaft 111 is installed inside the slot 11; the eccentric wheel 61 mechanism 6 includes: an eccentric wheel 61 sleeved on the second rotating shaft 4; a rotating hook 62 including a sleeve end 621 sleeved on the eccentric wheel 61, and a locking part 622 extending radially from the sleeve end 621, the locking part 622 having a slot 6220 matching the shape of the limiting shaft 111, and an adjusting member 6223 telescopically connected to the inner surface of the slot 6220, the adjusting member 6223 being used to adjust the size of the slot 6220 to fit snugly against the limiting shaft 111; and a first reset member 7 connected between the rotating hook 62 and the second connector 2.

[0047] The first reset member 7 is used to drive the rotating hook 62 to rotate counterclockwise or clockwise with the eccentric wheel 61, so that the rotating hook 62 is reset to the initial state of the upward-extending hook. When the first connector 1 and the second connector 2 are engaged, the first connector 1 is rotated clockwise close to the second connector 2 until the limiting shaft 111 contacts the side of the engaging part 622 of the rotating hook 62. At this time, the first connector 1 is pushed closer to the second connector 2 and rotated clockwise, thereby driving the limiting shaft 111 downward past the side of the engaging part 622 of the rotating hook 62 and into the inside of the slot 6220, until the first connector 1 and the second connector 2 are fully engaged. At this time, the first connector 1 just drives the limiting shaft 111 to fit snugly into the slot 6220 and the adjusting member 6223, thereby locking the first safety device.

[0048] Because the adjusting member 6223 is telescopically and movably connected to the inner surface of the latch 6220, when the folding bike is subjected to external impact during riding, causing misalignment in the assembly of the eccentric wheel 61 and the rotating hook 62, the user can adjust the telescopic length of the adjusting member 6223 relative to the inner surface of the latch 6220 (i.e., adjust the length of the adjusting member 6223 extending beyond the inner surface of the latch 6220). This changes the contact surface dimensions formed by the contour of the inner surface of the latch 6220 and the outer contour of the end of the adjusting member 6223 protruding from the inner surface of the latch 6220. The depth of the adjusting member 6223 relative to the insertion depth into the bayonet 6220 is adjusted to re-fit the limiting shaft 111, correcting the misalignment of the bayonet 6220 caused by external impact. This ensures the positional accuracy of the limiting end cap when the rotating hook 62 returns to its initial upward extension state, and maintains that the bayonet 6220 and the limiting shaft 111 can always fit precisely when the first folding seat and the second folding seat are fastened together. This avoids the risk of the first safety device failing due to misalignment of the bayonet 6220 caused by external impact.

[0049] Please refer to the following: Figure 2-7In this embodiment, the limiting shaft 111 can be a cylindrical shaft with a circular cross-section, a square shaft with a rectangular cross-section, or a shaft with a regular or irregular cross-section.

[0050] Please refer to the following: Figure 3-7 In this embodiment, the first reset member 7 is a first reset spring. The first reset spring (first reset member 7) is sleeved on the second rotating shaft 4, and one of the leads of the first reset spring (first reset member 7) abuts against the corresponding hole of the rotating hook 62, and the other lead of the first reset spring (first reset member 7) abuts against the corresponding hole of the second connector 2.

[0051] Please refer to the following: Figure 2-7 In this embodiment, the engaging portion 622 includes:

[0052] An extension 6221 extends radially from the end of the wheel sleeve 621, and a snap-fit ​​section 6222 is connected to the end of the extension 6221 away from the end of the wheel sleeve 621. The snap-fit ​​section 6222 extends in an arc shape from the end of the extension 6221 away from the end of the wheel sleeve 621 toward the first connector 1, so that the extension 6221 and the snap-fit ​​section 6222 form a snap-fit ​​opening 6220 with an arc-shaped inner surface. The adjusting member 6223 is telescopically and movably connected to the inner surface of the snap-fit ​​section 6222 facing the snap-fit ​​opening 6220.

[0053] Please refer to the following: Figure 3-7 In this embodiment, the connection between the extension segment 6221 and the wheel sleeve end 621 and the connection between the extension segment 6221 and the snap-fit ​​segment 6222 are both arc-shaped transitions. The snap-fit ​​segment 6222 is connected to the end of the extension segment 6221 away from the wheel sleeve end 621, and together with the extension segment 6221, forms a hook-shaped structure connected to the wheel sleeve end 621. The arc-shaped profile of the hook-shaped structure facing the inner side of the first connector 1 forms the aforementioned snap-fit ​​6220.

[0054] In this embodiment, the engaging part 622 is preferably integrally formed.

[0055] Please refer to the following: Figure 3-7 In this embodiment, the snap-fit ​​segment 6222 is located away from the extension segment 6221 and faces the top end (i.e., side) of the first connector 1, forming a chamfered transition surface that matches the position of the limiting shaft 111. When the first connector 1 and the second connector 2 are engaged, the first connector 1 is rotated clockwise close to the second connector 2 until the limiting shaft 111 contacts the chamfered transition surface on the side of the engaging portion 622 of the rotating hook 62. At this time, the first connector 1 is pushed closer to the second connector 2 and rotated clockwise, thereby driving the limiting shaft 111, guided by the chamfered transition surface, downward along the chamfered transition surface past the side of the engaging portion 622 of the rotating hook 62 and downward into the inside of the slot 6220.

[0056] Please refer to the following: Figure 3-7 In this embodiment, the snap-fit ​​section 6222 is provided with a threaded through hole 6224 that connects to the snap-fit ​​opening 6220. The adjusting member 6223 is an adjusting screw that matches the threaded through hole 6224. The adjusting screw is telescopically connected to the inner surface of the snap-fit ​​opening 6220 by cooperating with the threaded through hole 6224.

[0057] Please refer to the following: Figure 1-7 In this embodiment, a pair of first protrusions 12 are provided on the side of the first connector 1 opposite to the hinge side of the second connector 2. The pair of first protrusions 12 and the first connector 1 form the above-mentioned slot 11 that runs vertically through each other. The first protrusions 12 are provided with mounting holes that match the shape of the limiting shaft 111. The two ends of the limiting shaft 111 are respectively inserted into the corresponding mounting holes of the pair of first protrusions 12.

[0058] Please refer to the following: Figure 4-7 In this embodiment, in the initial state of the hook, the hook 62 is rotated to return to a vertically upward extension and the top surface of the latch 6220 is kept parallel to the horizontal plane. In the state of the first connector 1 and the second connector 2 being fastened, the top surface of the first protrusion 12 is parallel to the horizontal plane. That is, in the state of the first connector 1 and the second connector 2 being fastened, the top surface of the latch 6220 is parallel to the top surface of the first protrusion 12.

[0059] Please refer to the following: Figure 4-7 In a preferred embodiment of this invention, the adjusting member 6223 is disposed on the top surface of the latch 6220. When the latch 62 is rotated to reset to extend vertically upward and keep the top surface of the latch 6220 parallel to the horizontal plane in the initial state, the adjusting member 6223 extends downward from the horizontal top surface of the latch 6220 toward the latch 6220.

[0060] Please refer to the following: Figure 2-7 In this embodiment, a third limiting structure 623 is provided at the connection between the extension section 6221 and the wheel sleeve end 621, and a fourth limiting structure 211 matching the third limiting structure 623 is provided on the second protrusion 21. During the upward and downward flipping process of the rotating hook 62, the third limiting structure 623 and the fourth limiting structure 211 cooperate to limit the upward flipping stroke of the rotating hook 62 to a hook-fitting state slightly biased towards the first connector 1, and at the same time limit the downward flipping stroke of the rotating hook 62 to a certain angle with the second connector 2.

[0061] Please refer to the following: Figure 2-7 As a preferred embodiment of this embodiment, the third limiting structure 623 is a limiting protrusion provided on the side of the connection between the extension section 6221 and the wheel sleeve end 621, and the fourth limiting structure 211 is an arc-shaped guide groove provided on the top surface of the second protrusion 21 away from the edge of the second connector 2.

[0062] Please refer to the following: Figure 2-7 In this embodiment, the second connector 2 is provided with a pair of second protrusions 21 at intervals on the other side relative to the first rotating shaft 3. The second protrusions 21 are provided with hinge holes that match the shape of the second rotating shaft 4. The two ends of the second rotating shaft 4 are respectively inserted into the corresponding hinge holes of the pair of second protrusions 21.

[0063] Please refer to the following: Figure 2-7 In this embodiment, the eccentric wheel 61 is provided with a shaft hole 611 that cooperates with the second rotating shaft 4, and the shaft hole 611 is eccentrically set with respect to the center of the eccentric wheel 61.

[0064] Please refer to the following: Figure 2-7 In a preferred embodiment of this invention, one side of the second rotating shaft 4 is a straight surface formed by removing a portion of the structure along its axial direction. The cross-sectional shape of the second rotating shaft 4 is an approximately circular shape with a notch on one side. The cross-sectional shape of the shaft hole 611 of the eccentric wheel 61 is an approximately circular shape that matches the shape of the second rotating shaft 4. The side of the shaft hole 611 of the eccentric wheel 61 facing away from the straight surface of the second rotating shaft 4 is a thick-walled side with a larger wall thickness, and the other side of the shaft hole 611 of the eccentric wheel 61 facing the straight surface is a thin-walled side with a wall thickness less than that of the thick-walled side.

[0065] Please refer to the following: Figure 1-7 In this embodiment, the first safety device further includes:

[0066] The first limiting structure 6211 is located at the wheel sleeve end 621; the second limiting structure 51 is located on the locking handle 5 in a matching manner with the first limiting structure 6211.

[0067] Move the locking handle 5 away from the first connector 1 and rotate it clockwise until the second limiting structure 51 contacts the first limiting structure 6211. At this time, continue to move the locking handle 5 clockwise and drive the rotating hook 62 from the initial state of the upward-extending hook to rotate clockwise as the eccentric wheel 61 moves away from the first connector 1, so that the latch 6220 disengages from the limiting shaft 111 and unlocks the first safety device.

[0068] Please refer to the following: Figure 4-7 In this embodiment, when the rotating hook 62 is in the initial state of extending upwards, the extension section 6221 is parallel or approximately parallel to the vertical direction (the angle with the vertical direction is within ±0.5 degrees), the locking section 6222 is correspondingly horizontal or approximately horizontal (the angle with the horizontal direction is within ±0.5 degrees), and the adjusting member 6223 is correspondingly parallel or approximately parallel to the vertical direction (the angle with the vertical direction is within ±0.5 degrees).

[0069] Please refer to the following: Figure 1-7In this embodiment, the first limiting structure 6211 is a limiting protrusion located on the side of the wheel sleeve end 621 away from the extension section 6221, and the second limiting structure 51 is a limiting part located at the bottom end of the locking handle 5 along with the limiting protrusion (the first limiting structure 6211).

[0070] Please refer to the following: Figure 4-5 In this embodiment, the first safety device further includes:

[0071] The second reset component 8 is connected between the locking handle 5 and the second connector 2. It is used to drive the locking handle 5 to rotate so that the locking handle 5 is reset to the initial state of the handle at an angle to the vertical direction. The size of the angle can make way for the locking handle 5 to make way for the first connector 1 and the second connector 2 to engage.

[0072] Please refer to the following: Figure 4-7 As a preferred embodiment of this invention, the included angle ranges from 30 to 60 degrees.

[0073] Please refer to the following: Figure 4-7 As a preferred embodiment of this invention, the included angle is 45 degrees.

[0074] As a preferred embodiment, in the initial state of the handle, the locking handle 5 is flipped so that the bayonet 6220 and the limiting shaft 111 are slightly loose, but still remain inseparable, so that the first safety device does not fail.

[0075] Please refer to the following: Figure 3 , 7 In this embodiment, during the process of turning the locking handle 5 to rotate the second rotating shaft 4 and the eccentric wheel 61, the perpendicular line between the straight surface of the second rotating shaft 4 and the axis of the second rotating shaft 4 is always parallel to the length direction of the locking handle 5.

[0076] Please refer to the following: Figure 6-7 In this embodiment, the second reset member 8 drives the locking handle 5 to flip and reset to a 45-degree angle with the vertical direction. At this time, the locking handle 5 is in the initial state of the handle, and the perpendicular line between the straight surface of the second rotating shaft 4 and the axis of the second rotating shaft 4 is parallel to the locking handle 5. That is, the perpendicular line between the straight surface of the second rotating shaft 4 and the axis of the second rotating shaft 4 is also at a 45-degree angle with the vertical direction. The thick-walled side of the eccentric wheel 61 rotates to a 45-degree angle downward pointing to the lower part of the second connector 2, and the thin-walled side of the eccentric wheel 61 rotates to a 45-degree angle upward pointing to the end of the locking handle 5. At this time, the eccentric wheel 61 is in the initial state of the wheel body.

[0077] Please refer to the following: Figure 4-5In this embodiment, the second reset member 8 is a second reset spring. The second reset spring (second reset member 8) is sleeved on the second rotating shaft 4, and one of the leads of the second reset spring (second reset member 8) abuts against the corresponding hole of the locking handle 5, and the other lead of the second reset spring (second reset member 8) abuts against the corresponding hole of the second connector 2.

[0078] Please refer to the following: Figure 4-7 In the preferred embodiment of this example, in the initial state of the handle, the locking handle 5 forms a 45-degree angle with the vertical direction. At this time, the locking handle 5 just flips to the point where the second limiting structure 51 contacts the first limiting structure 6211, and drives the rotating hook 62 from a hook-fitting state slightly biased towards the first connector 1 to a clockwise flipping state of the hook extending upward as the eccentric wheel 61 moves away from the first connector 1, so that the latch 6220 disengages from the limiting shaft 111 and unlocks the first safety device.

[0079] Please refer to the following: Figure 1-7 In this embodiment, the locking handle 5 is open on the side facing the first connector 1 and the second connector 2. The inside of the locking handle 5 forms a receiving cavity that communicates with the open side. The locking handle 5 is hinged to the second connector 2 on the other side of the handle bottom, which is opposite to the first rotating shaft 3. The two sides of the handle bottom are respectively provided with bushings with shaft holes 611. The distance between the pair of bushings is greater than the distance between the pair of second protrusions 21 that are spaced apart on the other side of the second connector 2 opposite to the first rotating shaft 3. The top of the second connector 2 is provided with recessed relief grooves on both sides of the pair of second protrusions 21. The bushings on both sides of the handle bottom extend into the corresponding relief grooves. The pair of bushings are installed on the opposite outer side of the pair of second protrusions 21 through the second rotating shaft 4 through the corresponding hinge holes and shaft holes 611 of the second protrusions 21, so that the second connector 2 and the locking handle 5 rotate (flip) relative to each other around the second rotating shaft 4, thereby realizing the hinge between the second connector 2 and the locking handle 5.

[0080] Please refer to the following: Figure 1-7 In this embodiment, the second safety device includes:

[0081] The movable locking mechanism 9 is movably installed in the receiving cavity of the locking handle 5 facing the first connector 1; the locking limiting structure 14 is installed on the handlebar 13 and is used to cooperate with the movable locking mechanism 9 to lock or unlock the second safety device.

[0082] Please refer to the following: Figure 1-7 In this embodiment, the movable locking mechanism 9 includes:

[0083] A sliding channel 91 is provided on the locking handle 5 and extends through the receiving cavity and the outer surface of the locking handle 5 facing away from the first connector 1; a slider 92 is movably installed in the sliding channel 91; a movable part 93 is installed on the side of the slider 92 facing the first connector 1, and the bottom end of the movable part 93 is provided with a first guide cone surface 931; a third reset part 94 is connected between the locking handle 5 and the slider 92.

[0084] The locking and limiting structure 14 is a limiting member 141 that matches the movable member 93, and the position of the limiting member 141 matches the slider 92. The top of the limiting member 141 is provided with a limiting groove 1411, and the edge of the limiting member 141 facing away from the handlebar 13 is provided with a second guide cone surface 1412 that extends to the edge of the limiting groove 1411 and matches the first guide cone surface 931.

[0085] As the rotating handle is turned counterclockwise near the first connector 1 until it is nearly parallel to the vertical direction and close to the top of the first connector 1, the second guide cone 1412 contacts the first guide cone 931 and guides the first guide cone 931 to gradually slide upward along the second guide cone 1412. At the same time, the slider 92 is pushed to move the movable part 93 away from the limiting part 141 and compress the third reset part 94 until the first guide cone 931 passes the second guide cone 1412 and reaches above the limiting groove 1411. At this time, the third reset part 94 is released from compression. Under the reset action of the third reset part 94, the slider 92 is pushed to move the movable part 93 closer to the limiting part 141 until the bottom end of the movable part 93 contacts and is locked into the limiting groove 1411, thereby locking the second safety device. At this time, the folding secondary safety structure is in a double-locked state.

[0086] When the folding secondary safety structure is in a double-locked state, by pushing the slider 92, the movable part 93 moves away from the limiting part 141 and compresses the third reset part 94 until the movable part 93 is completely disengaged from the limiting groove 1411. At this time, the rotating handle is released. Under the reset action of the second reset part 8, the rotating handle is pushed from the handle-fitted state to the second connector 2 and rotated clockwise until the rotating handle rotates clockwise to the initial state of the handle, which is close to the vertical direction at a 45-degree angle. At the same time, under the reset action of the third reset part 94, the slider 92 is pushed to reset the movable part 93 to the initial state of the slider 92, thereby unlocking the second safety device. At this time, the folding secondary safety structure is in a single-locked state.

[0087] Please refer to the following: Figure 6-7 In this embodiment, the third reset member 94 is a third reset spring. One end of the third reset spring (third reset member 94) abuts against the slider 92, and the other end of the third reset spring (third reset member 94) abuts against the rotating handle.

[0088] Please refer to the following: Figure 1-7 In a preferred embodiment of this invention, the slider 92 is provided with a handle 921 on the side facing away from the first connector 1, so that the user can hold and push the slider 92 to slide back and forth along the sliding channel 91.

[0089] In other embodiments of this example (not shown in the figure), the movable locking mechanism 9 may also consist of a lever assembly rotatably mounted on the locking handle 5 and a torsion spring connecting the lever assembly and the locking handle 5, and the locking limiting structure 14 is a lever groove that matches the lever assembly.

[0090] Please refer to the following: Figure 1-7 In this embodiment, the principle of the folded secondary safety structure is as follows:

[0091] The secondary locking steps of the folding secondary safety structure:

[0092] When the folding secondary safety structure is in the unlocked state, the rotating hook 62 is in an initial state of extending vertically upward under the reset action of the first reset member 7, the locking handle 5 is in an initial state of being at a 45-degree angle to the vertical direction under the reset action of the second reset member 8, the eccentric wheel 61 is in an initial state of being 45 degrees downward on the thick wall side and 45 degrees upward on the thin wall side, at the same time the extension section 6221 is approximately parallel to the vertical direction (the angle with the vertical direction is within ±0.5 degrees), the locking section 6222 is approximately horizontal (the angle with the horizontal direction is within ±0.5 degrees), the adjusting member 6223 is approximately parallel to the vertical direction (the angle with the vertical direction is within ±0.5 degrees), the second limiting structure 51 is in contact with the first limiting structure 6211, and the first connector 1 and the second connector 2 are in a foldable separated state.

[0093] With the folded secondary safety structure in the unlocked state, move the first connector 1 close to the second connector 2 and rotate it clockwise until the limiting shaft 111 contacts the chamfered transition surface on the side of the engaging part 622 of the rotating hook 62. At this time, continue to push the first connector 1 close to the second connector 2 and rotate it clockwise, thereby driving the limiting shaft 111 to move downward along the chamfered transition surface, passing the side of the engaging part 622 of the rotating hook 62, and entering the inside of the slot 6220.

[0094] As the limiting shaft 111 passes downward along the chamfered transition surface past the engaging part 622 of the rotating hook 62, it simultaneously drives the rotating hook 62 to rotate counterclockwise as the eccentric wheel 61 approaches the first connector 1, until the thick-walled side of the eccentric wheel 61 rotates counterclockwise to a near vertically downward direction (the direction of the thick-walled side is slightly deviated from the second connector 2 and forms an angle of less than 5 degrees with the vertical direction), and the thin-walled side of the eccentric wheel 61 rotates counterclockwise to a near vertically upward direction (the direction of the thin-walled side is slightly deviated from the first connector 1 and forms an angle of less than 5 degrees with the vertical direction). At this time, the perpendicular line between the straight surface of the second rotating shaft 4 and the axis of the second rotating shaft 4 is nearly parallel to the vertical direction (forming an angle of less than 5 degrees).

[0095] Simultaneously, the extension section 6221 rotates counterclockwise to slightly deviate from the first connector 1, forming an angle of less than 5 degrees with the vertical direction; the locking section 6222 rotates counterclockwise to form an angle of less than 5 degrees with the horizontal direction; and the adjusting member 6223 rotates counterclockwise to slightly deviate from the first connector 1, forming an angle of less than 5 degrees with the vertical direction. In other words, the rotating hook 62 rotates counterclockwise to a hook-fitting state slightly deviated from the first connector 1. Furthermore, as the limiting shaft 111 passes downwards along the chamfered transition surface past the locking portion 622 of the rotating hook 62, in addition to causing the rotating hook 62 to rotate counterclockwise with the eccentric wheel 61 towards the first connector 1, the rotating hook 62 also causes the first limiting structure 6211 and the rotating handle to rotate counterclockwise towards the first connector 1 by a certain angle via the second limiting structure 51.

[0096] At this point, the first connector 1 and the second connector 2 are flipped to fully engage, and the first connector 1 drives the limiting shaft 111 to engage with the locking slot 6220 and adjusting component 6223 of the rotating hook 62, which is in a hook-fitting state after being flipped counterclockwise, thereby locking the first safety device. At this point, the folding secondary safety structure is in a single-lock state (achieving one-time locking). Then, the rotating handle is moved close to the first connector 1 and flipped counterclockwise until the rotating handle is flipped counterclockwise to a state where it is almost parallel to the vertical direction and close to the handle of the stem 13 at the top of the first connector 1. Finally, the second safety device (such as the buckle) on the rotating handle is locked with the corresponding structure (such as the buckle groove) of the stem 13, thereby locking the second safety device. At this point, the folding secondary safety structure is in a double-lock state (achieving two-time locking).

[0097] Unlocking steps for a folded secondary security structure under secondary locking:

[0098] When the folding secondary safety structure is in a double-locked state, disengage the second safety device (such as a latch) on the rotating handle from the corresponding structure (such as a latch groove) on the stem 13, thereby unlocking the second safety device. At this time, the folding secondary safety structure is in a single-locked state (achieving a single-lock).

[0099] Then, under the reset action of the second reset member 8, the rotating handle is pushed to rotate clockwise from the handle contact state to the second connector 2 until the second limit structure 51 contacts the first limit structure 6211. At this time, the second reset member 8 continues to push the locking handle 5 to rotate clockwise and drive the rotating hook 62 from the hook contact state slightly biased towards the first connector 1, and rotate clockwise as the eccentric wheel 61 moves away from the first connector 1 until the locking handle 5 rotates clockwise to the handle initial state at a 45-degree angle with the vertical direction. At this time, the eccentric wheel 61 is in the wheel initial state with the thick wall side tilted downward at 45 degrees and the thin wall side tilted upward at 45 degrees.

[0100] Simultaneously, the extension section 6221 rotates clockwise to approximately parallel to the vertical direction (within ±0.5 degrees of the vertical angle), the locking section 6222 rotates clockwise to approximately horizontal (within ±0.5 degrees of the horizontal angle), and the adjusting component 6223 rotates clockwise to approximately parallel to the vertical direction (within ±0.5 degrees of the vertical angle), meaning the rotating hook 62 rotates clockwise to its initial state, close to its vertically extending upward extension. At this time, the limiting shaft 111 is still within the latch 6220, preventing the action of turning the first connector 1 away from the second connector 2 and rotating it counterclockwise from the second connector 2 from being achieved due to the restriction of the latch 6220 on the limiting shaft 111. Therefore, the folding secondary safety structure remains in a single-lock state.

[0101] Subsequently, continue to rotate the handle clockwise towards the second connector 2 to cause the rotating hook 62 to rotate clockwise and continue to rotate clockwise towards the second connector 2 until the limiting shaft 111 is completely disengaged and exits the bayonet 6220. Then, rotate the first connector 1 counterclockwise away from the second connector 2 to unlock the first safety device. At this time, the folding secondary safety structure is in the unlocked state (achieving one-time locking). Continue to rotate the first connector 1 counterclockwise away from the second connector 2 until the first connector 1 abuts against the second connector 2, completing the folding action of the first connector 1. At the same time, release the locking handle 5. Under the reset action of the second reset member 8, the locking handle 5 rotates counterclockwise towards the first connector 1 until the locking handle 5 is reset to the initial state of the handle at a 45-degree angle with the vertical direction. Under the reset action of the first reset member 7, the rotating hook 62 rotates counterclockwise to the initial state of the hook that is close to the vertically upward extension.

[0102] This utility model also provides a portable vehicle (not shown in the figure), including a base and a handlebar 13, and also includes the above-mentioned folding secondary safety structure. The handlebar 13 is installed on the first connector 1 for mounting the handlebars (not shown in the figure).

[0103] In this embodiment, the portable vehicle is a portable bicycle, electric vehicle, scooter, or wheelchair.

[0104] 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 folding secondary safety structure, comprising a first joint (1) and a second joint (2) hinged together by a first pivot (3), wherein the second joint (2) is hinged to a locking handle (5) on the opposite side of the first pivot (3) by a second pivot (4), a first safety device and a second safety device for locking the first joint (1) and the second joint (2), wherein the first safety device is used to keep the first joint (1) and the second joint (2) interlocked when the second safety device fails, characterized in that, The first safety device includes: A slot (11) is provided on the other side of the first connector (1) opposite to the first rotating shaft (3); A limiting shaft (111) is installed on the inner side of the slot (11); The eccentric wheel (61) mechanism (6) includes: an eccentric wheel (61) sleeved on the second rotating shaft (4); a rotating hook (62) including a sleeve end (621) sleeved on the eccentric wheel (61), and a locking part (622) extending radially from the sleeve end (621), the locking part (622) having a slot (6220) matching the shape of the limiting shaft (111), and an adjusting member (6223) telescopically connected to the inner surface of the slot (6220) for adjusting the size of the slot (6220) to fit snugly to the limiting shaft (111); The first reset component (7) is connected between the rotating hook (62) and the second connector (2); The first reset member (7) is used to drive the rotating hook (62) to flip with the eccentric wheel (61) so that the rotating hook (62) is reset to the initial state of the hook extending upward. When the first connector (1) and the second connector (2) are engaged, the limiting shaft (111) is engaged with the bayonet (6220) and the adjusting member (6223) to lock the first safety device.

2. The folding secondary safety structure as described in claim 1, characterized in that, The engaging portion (622) includes: An extension (6221) extends radially from the wheel sleeve end (621) and is connected to a snap-fit ​​section (6222) at the end of the extension (6221) away from the wheel sleeve end (621). The extension (6221) and the snap-fit ​​section (6222) form a bayonet (6220). The adjusting member (6223) is telescopically and movably connected to the inner surface of the snap-fit ​​section (6222) facing the bayonet (6220).

3. The folding secondary safety structure as described in claim 2, characterized in that, The snap-fit ​​section (6222) is provided with a threaded through hole (6224) communicating with the bayonet (6220). The adjusting member (6223) is an adjusting screw that matches the threaded through hole (6224). The adjusting screw is telescopically connected to the inner surface of the bayonet (6220) by cooperating with the threaded through hole (6224).

4. The folding secondary safety structure as described in any one of claims 1-3, characterized in that, The first safety device also includes: A first limiting structure (6211) is provided at the wheel sleeve end (621); The second limiting structure (51) is provided on the locking handle (5) in a matching manner with the first limiting structure (6211); The locking handle (5) is flipped away from the first connector (1) until the second limiting structure (51) contacts the first limiting structure (6211) and drives the rotating hook (62) to flip away from the first connector (1) along with the eccentric wheel (61) from the initial state of the hook, so that the bayonet (6220) is disengaged from the limiting shaft (111) and the first safety device is unlocked.

5. The folding secondary safety structure as described in claim 4, characterized in that, The first safety device also includes: The second reset component (8) is connected between the locking handle (5) and the second connector (2) to drive the locking handle (5) to flip so that the locking handle (5) is reset to the initial state of the handle at an angle to the vertical direction. The size of the angle can make way for the locking handle (5) to make way for the first connector (1) and the second connector (2) to engage.

6. The folding secondary safety structure as described in claim 5, characterized in that, The included angle ranges from 30 to 60 degrees.

7. The folding secondary safety structure as described in claim 5, characterized in that, In the initial state of the handle, the locking handle (5) is just flipped so that the bayonet (6220) disengages from the limiting shaft (111).

8. The folding secondary safety structure as described in any one of claims 1-3, characterized in that, The first connector (1) is provided with a pair of first protrusions (12) at intervals on the other side of its hinge side with the second connector (2). The pair of first protrusions (12) and the first connector (1) form the slot (11). The first protrusions (12) are provided with mounting holes that match the shape of the limiting shaft (111). The two ends of the limiting shaft (111) are respectively inserted into the corresponding mounting holes of the pair of first protrusions (12).

9. The folding secondary safety structure as described in claim 8, characterized in that, In its initial state, the hook is rotated (62) to return to its vertically upward extension, and the top surface of the latch (6220) remains parallel to the horizontal plane; When the first connector (1) and the second connector (2) are engaged, the top surface of the first protrusion (12) is parallel to the horizontal plane.

10. A portable vehicle, comprising a base and handlebars (13), characterized in that, It also includes a folding secondary safety structure as described in any one of claims 1-9, wherein the stem (13) is mounted on the first connector (1).

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