A stroller with stepwise folding

Abstract

The application discloses a step-by-step folding baby stroller, which comprises a foldable frame and a seat part. The frame comprises a handle and a handle joint seat, and the handle joint seat is provided with a handle locking mechanism. The handle unlocking mechanism is triggered by external force to drive the handle locking mechanism to be released to allow the handle to rotate. The seat part is pivotally connected to the frame through a seat joint seat, and the seat joint seat is provided with a seat locking mechanism. The seat locking mechanism and the handle joint seat are transmissionally connected through a seat unlocking mechanism. The seat unlocking mechanism is triggered by the handle rotation to drive the seat locking mechanism to be released to allow the seat part to be folded or disassembled relative to the frame. In the folding process, the handle locking mechanism is moved from the locking position to the release position earlier than the seat locking mechanism. The application realizes step-by-step linkage folding under a single and coherent action by linkage triggering of the seat part unlocking through the handle rotation, simplifies the folding process and is convenient for single-hand control.

Description

Technical Field

[0001] This invention relates to the field of infant and toddler products technology, and in particular to a step-folding baby stroller. Background Technology

[0002] Most existing strollers are foldable models. The ability to unlock each component in a logical sequence when folding the stroller is crucial to its safety and user experience. To prevent accidental folding while the child is still in the seat, some strollers require users to fold or disassemble the seat independently before folding the frame. While this artificially set sequence improves safety to some extent, it requires users to operate each component separately, making the folding process cumbersome and difficult to complete with one hand.

[0003] For example, CN210502832U discloses a safer folding baby stroller. The folding process is as follows: the user first unlocks and folds the handle assembly forward, so that the handle assembly releases the pressure on the safety lock on the frame, and the safety lock releases the lock on the support assembly; then, the user operates the folding handle located on the bottom of the seat to release another lock on the support assembly, and finally completes the folding of the stroller. This folding state requires the user to achieve two independent steps, which is difficult to operate with one hand. In particular, it poses an operational obstacle and safety hazard for users who hold infants with one hand (such as parents who take care of their children alone).

[0004] In summary, due to safety considerations, existing vehicle retrieval technology requires users to operate the retrieval process independently in several steps, resulting in cumbersome procedures and inconvenience for one-handed operation. Summary of the Invention

[0005] The main objective of this invention is to propose a step-folding baby stroller, which aims to solve the technical problems of cumbersome folding process and inconvenience of one-handed operation in the existing technology.

[0006] To achieve the above objectives, the present invention proposes a step-folding baby stroller, comprising a foldable frame and a seat. The frame includes a handlebar and a hand joint seat. The handlebar is pivotally connected to the rest of the frame via the hand joint seat. A hand locking mechanism is provided within the hand joint seat, and a hand unlocking mechanism is provided between the handlebar and the hand joint seat. The hand unlocking mechanism is configured to be triggered by external force to drive the hand locking mechanism from a locked position to an unlocked position, allowing the handlebar to rotate. The seat has a seat joint seat and is connected to the frame via the seat joint seat. A seat locking mechanism is provided within the seat joint seat, and a seat unlocking mechanism is also included. The seat locking mechanism and the hand joint seat are connected by a transmission mechanism via the seat unlocking mechanism. The seat unlocking mechanism is configured to be triggered by the rotation of the handlebar to drive the seat locking mechanism from a locked position to an unlocked position, allowing the seat to be folded or detached relative to the frame.

[0007] During the closing process, the hand locking mechanism moves from the locked position to the released position before the seat locking mechanism.

[0008] Furthermore, the seat unlocking mechanism includes a column housed within the hand joint seat and a linkage component that is drivenly connected to the column. The column rotates synchronously with the hand joint seat and converts the rotational motion of the hand joint seat into a linear motion of the linkage component toward the seat locking mechanism.

[0009] Furthermore, the column includes a platform body arranged axially along the hand joint seat, and a ring body provided at the end of the platform body. A mounting groove is provided on the ring body, and the mounting groove extends circumferentially along the ring body. The linkage assembly includes an intermediate member and a linkage rod that form a transmission through a bevel engagement. One side of the intermediate member extends into the mounting groove. When the ring body rotates with the platform body, it drives the intermediate member. The intermediate member pushes the linkage rod through the bevel, thereby releasing the seat locking mechanism.

[0010] Furthermore, a limiting groove is provided in the hand joint seat, and the other side of the intermediate member extends into the limiting groove. The limiting groove is configured to restrict the movement direction of the intermediate member, so that the intermediate member only moves up and down along the radial direction of the ring body. A lifting ramp is provided on one side wall of the mounting groove. When the ring body rotates with the platform, the intermediate member moves from the bottom to the top of the lifting ramp. The linkage rod moves with the intermediate member by one unlocking stroke. When the intermediate member reaches the top of the lifting ramp, the linkage rod releases the seat locking mechanism.

[0011] Furthermore, the ring body has a stepped surface on the side facing the limiting groove, and the intermediate part has a recessed part that abuts against the stepped surface to limit the installation position of the intermediate part relative to the ring body; a spring groove is opened on the top of the intermediate part, and a spring for pressing the intermediate part against the ring body is installed in the spring groove.

[0012] Furthermore, the rider is a telescopic structure, including an upper tube and a lower tube. The upper tube is slidably disposed within the lower tube. The hand joint seat includes a connecting arm mounted on the lower tube and a joint seat cavity for mounting the hand locking mechanism. The connecting arm has a connecting channel. The hand unlocking mechanism includes a hand transmission component and a hand unlocking component. The hand transmission component is disposed within the lower tube and has a transmission rod extending toward the joint seat cavity and passing through the connecting channel into the joint seat cavity. The hand transmission component is pushed by the sliding of the upper tube relative to the lower tube, which acts on the hand unlocking component, thereby releasing the hand locking mechanism.

[0013] Furthermore, the hand locking mechanism is a locking gear, and the joint seat cavity is provided with a slot. The locking gear is axially movable in the joint seat cavity and can be engaged with the slot of the joint seat cavity to lock the hand joint seat.

[0014] Furthermore, the hand transmission component and the hand unlocking component are respectively provided with inclined surfaces, and the inclined surfaces cooperate to form a transmission. The hand unlocking component is connected to the hand locking mechanism. The hand transmission component is pushed by the upper tube sliding relative to the lower tube. Through the inclined surface cooperation with the hand unlocking component, the linear motion of the upper tube sliding is converted into linear motion along the axial direction of the hand joint seat, so that the locking gear disengages from the slot along the axial direction.

[0015] Furthermore, the locking gear is provided with an extension groove for docking connection channel, and the bottom of the extension groove is provided with an inclined surface. The hand unlocking component is provided with a corresponding inclined surface. The hand transmission component is pushed by the upper tube sliding relative to the lower tube, which pushes the hand unlocking component. The hand unlocking component, through cooperation with the inclined surface of the extension groove, converts the linear motion of the push of the hand transmission component into a linear motion along the axial direction of the hand joint seat, so that the locking gear disengages from the slot along the axial direction.

[0016] Furthermore, the hand transmission component includes a mounting cavity with an opening facing the upper tube. The mounting cavity is provided with a buffer and an elastic element. One end of the buffer faces the upper tube, and the other end abuts against the elastic element. The other end of the elastic element abuts against the inner wall of the mounting cavity.

[0017] The present invention includes a foldable frame and a seat. The frame includes a rider and a hand joint seat. The hand joint seat contains a hand locking mechanism, and a hand unlocking mechanism is triggered by external force, releasing the hand locking mechanism to allow the rider to rotate. The seat is pivotally connected to the frame via a seat joint seat, which contains a seat locking mechanism. The seat locking mechanism and the hand joint seat are connected via a seat unlocking mechanism, which is triggered by the rider's rotation, releasing the seat locking mechanism to allow the seat to fold or detach relative to the frame. During folding, the hand locking mechanism moves from the locked position to the unlocked position before the seat locking mechanism. This invention achieves step-by-step folding with a single, continuous action by triggering the seat unlock with the rider's rotation, simplifying the folding process and facilitating one-handed operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0019] Figure 2 This is an exploded structural diagram of the present invention;

[0020] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0021] Figure 4 This is a schematic diagram of the partial fit of the hand joint seat;

[0022] Figure 5 This is an exploded structural diagram of the hand joint seat and linkage components;

[0023] Figure 6 This is a schematic diagram showing the fit between the ring body and the linkage assembly;

[0024] Figure 7 This is a schematic diagram showing the exploded structure of the ring and intermediate components;

[0025] Figure 8 A three-dimensional structural diagram of the driver and seat area;

[0026] Figure 9 This is a schematic diagram of the partial fit of the seat joint seat;

[0027] Figure 10 for Figure 9 A magnified view of a portion of point B in the middle;

[0028] Figure 11 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0029] Figure 12 for Figure 11 A magnified view of a portion of point C in the middle;

[0030] Figure 13 A three-dimensional structural diagram of the hand joint seat located in the direction of the connecting arm;

[0031] Figure 14 This is an exploded structural diagram of the hand transmission component, the hand unlocking component, and the locking gear;

[0032] Figure 15 A three-dimensional structural diagram of the hand joint seat and the buffer component in action;

[0033] Figure 16 An exploded structural diagram of the hand joint seat and the buffer component.

[0034] Figure 17 This is a side view of the invention in its unfolded state;

[0035] Figure 18 This is a side view of the invention in its semi-closed state;

[0036] Figure 19 This is a side view of the retracted state of the present invention.

[0037] The above figures include the following reference numerals:

[0038] 1. Frame; 11. Rider; 111. Top tube; 112. Down tube; 12. Hand joint seat; 12a; 12b. Two seats; 12A. Connecting arm; 12B. Joint seat cavity; 121. Limiting groove; 122. Connecting channel; 123. Limiting rod; 13. Locking gear; 131. Extension groove; 14. Hand unlocking mechanism; 141. Hand transmission component; 1411. Transmission rod; 1412. Mounting cavity; 1413. Limiting channel; 142. Hand unlocking component; 43. Buffer component; 144. Elastic component; 2. Seat section; 21. Seat joint seat; 22. Seat locking mechanism; 23. Seat unlocking mechanism; 231. Column; 2311. Platform; 2312. Ring; 23121. Mounting groove; 23121A. Lift ramp; 23122. Step surface; 232. Linkage assembly; 2321. Intermediate component; 23211. Recess; 23212. Spring groove; 2322. Linkage rod; 24. Locking pin, key, and other structures. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0041] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0042] Existing foldable baby strollers require multiple steps to fold for safety reasons, with each unlocking step being independent. This cumbersome process, especially when holding an infant with one hand, makes folding the stroller difficult. To address these shortcomings, this invention provides a step-by-step folding baby stroller.

[0043] In embodiments of the present invention, such as Figures 1 to 19 As shown, the step-folding stroller includes a foldable frame 1 and a seat 2. The frame 1 includes a handlebar 11 and a hand joint seat 12, with the handlebar 11 pivotally connected to the rest of the frame 1 via the hand joint seat 12. The key feature of this invention is that the power to rotate the handlebar 11 and hand joint seat 12 is converted, through an intermediate mechanism or component, into a power to unlock towards the seat 2. To avoid ambiguity, it should be explained that the hand joint seat 12 is a conventional technique involving separate rotation, comprising two rotatable seats 12a and 12b, with the handlebar 11 fixedly connected to one and rotating synchronously therewith, and the other connected to the rest of the frame 1. A detailed description follows with reference to the accompanying drawings.

[0044] like Figures 1 to 3 As shown, a hand locking mechanism is provided within the hand joint seat 12. There are various implementations of the hand locking mechanism; taking the mainstream axial disengagement locking method as an example, such as pin locking or gear locking, the appropriate method can be selected based on the actual structure of the frame 1. Correspondingly, a hand unlocking mechanism 14 is provided between the rider 11 and the hand joint seat 12. The hand unlocking mechanism 14 is triggered by external force, driving the hand locking mechanism from the locked position to the unlocked position, allowing the rider 11 to rotate. It should be explained that being triggered by external force means that the hand unlocking mechanism 14 receives a certain external force, pushing the hand locking mechanism and disengaging it from the locked state. There are several ways to trigger joint unlocking using external force, such as the cable linkage method and the telescopic tube impact method. These two are the mainstream technical solutions for triggering joint unlocking in the current technology. The advantage of the cable linkage method is its simple structure. The two ends of the internal cable are respectively set on the push / turn component on the frame 1 and the locking component inside the joint. The user pushes or twists to use the component to pull the cable to act on the locking component. The advantage of the telescopic tube impact method is that it is easy to operate. The rider 11 is designed as a telescopic upper and lower structure. After the upper and lower structure is released (usually by locking the pin), the upper part of the rider 11 retracts along the lower tube. The thrust generated by the gravity of the upper part of the rider 11 sliding down triggers the locking component. Those skilled in the art can adapt and choose the above-mentioned implementation methods according to objective conditions.

[0045] The seat 2 is provided with a seat joint seat 21, which is connected to the frame 1. The seat joint seat 21 contains a seat locking mechanism 22 and a seat unlocking mechanism 23. The seat locking mechanism 22 is connected to the hand joint seat 12 via the seat unlocking mechanism 23. The seat unlocking mechanism 23 is triggered by the rotation of the rider 11, driving the seat locking mechanism 22 from the locked position to the unlocked position, allowing the seat 2 to be folded or disassembled relative to the frame 1. It should be explained that the unlocking of the seat 2 has two meanings: first, it allows the seat 2 to rotate; second, it allows the seat 2 to be disassembled. Allowing the seat 2 to rotate is preferred because it eliminates the need for disassembly, allowing the frame 1 and seat 2 to be folded together for greater convenience. The seat locking mechanism 22 and seat unlocking mechanism 23 can refer to the hand locking and unlocking parts or other existing technologies, which will not be elaborated here. It is important to note that during the folding process, the seat unlocking mechanism 23 is triggered by the rotation of the rider 11. This means the hand lock mechanism moves from the locked position to the unlocked position before the seat lock mechanism 22, which is a key difference from existing technologies. The seat unlocking mechanism 23 is powered by the rotation of the hand joint seat 12. Therefore, after the hand lock mechanism releases and allows the rider 11 to rotate, the rotation of the rider 11 is automatically transmitted to the seat lock mechanism 22 via the hand joint seat 12 and the seat unlocking mechanism 23, causing it to unlock. This eliminates the need for a separate operation by the user, achieving a step-by-step, continuous folding motion, simplifying the folding process, facilitating one-handed operation, and maintaining the safe sequence of hands first, then seat.

[0046] like Figures 3 to 5 As shown, the seat unlocking mechanism 23 includes a column 231 disposed within the hand joint seat 12 and a linkage component 232 pulsatorically connected to the column 231. The column 231 rotates synchronously with the hand joint seat 12, converting the rotational motion of the hand joint seat 12 into linear motion of the linkage component 232 toward the seat locking mechanism 22. The synchronous rotation of the column 231 and the hand joint seat 12 can be achieved through fixed connection, integral molding, or spline engagement. The advantage of this arrangement is that the unlocking of the seat locking mechanism 22 no longer depends on independent operation, but is automatically triggered by the rotation of the hand joint seat 12, simplifying the vehicle folding process, facilitating one-handed operation, and maintaining the safe sequence of hands first, then seat.

[0047] Specifically, the column 231 includes a platform 2311 arranged axially along the hand joint seat 12 and an annular body 2312 located at the end of the platform 2311. The platform 2311 rotates synchronously with the hand joint seat 12. An installation groove 23121 is provided on the annular body 2312, which extends circumferentially along the annular body 2312. The linkage component 232 includes an intermediate member 2321 and a linkage rod 2322 that form a transmission through a bevel engagement. One side of the intermediate member 2321 extends into the installation groove 23121. When the annular body 2312 rotates with the platform 2311, the intermediate member 2321 moves with the rotation of the annular body 2312 because it is installed in the installation groove 23121. The movement is then transmitted to the linkage rod 2322 through the bevel engagement, causing the linkage rod 2322 to move in the direction toward the seat locking mechanism 22, and finally push the seat locking mechanism 22 to release the lock.

[0048] More specifically, the hand joint seat 12 is provided with a limiting groove 121, and the other side of the intermediate member 2321 extends into the limiting groove 121. The limiting groove 121 is used to restrict the movement direction of the intermediate member 2321, so that the intermediate member 2321 can only move up and down along the radial direction of the ring body 2312. The cooperation between the limiting groove 121 and the intermediate member 2321 ensures that the intermediate member 2321 can only move up and down along the radial direction of the ring body 2312 under the drive of the ring body 2312, avoiding the intermediate member 2321 from deviating during the transmission process and affecting the reliability of the transmission.

[0049] Furthermore, such as Figure 6As shown, one side wall of the mounting groove 23121 is provided with a lifting ramp 23121A. When the ring body 2312 rotates with the platform 2311, the intermediate member 2321 moves from the bottom to the top of the lifting ramp 23121A. The connecting rod 2322 moves with the intermediate member 2321 for one unlocking stroke. When the intermediate member 2321 reaches the top of the lifting ramp 23121A, the connecting rod 2322 releases the seat locking mechanism 22. The lifting ramp 23121A converts the rotational motion of the ring body 2312 into a gradual radial lifting of the intermediate member 2321. During the process of moving from the bottom to the top of the lifting ramp 23121A, the intermediate member 2321 continuously drives the connecting rod 2322, causing the connecting rod 2322 to complete one unlocking stroke and release the seat locking mechanism 22 when it reaches the top. It should be explained that the unlocking stroke of the linkage 2322 refers to the stroke generated by the linkage 2322 sufficient to release the seat locking mechanism 22. This can be understood in two ways: First, during the lifting process of the lifting ramp 23121A, the intermediate member 2321 continuously pushes the linkage 2322 accordingly until it reaches the highest point of the lifting ramp 23121A (i.e., the outer ring surface of the ring body 2312), at which point the displacement of the linkage 2322 reaches its maximum. The linkage 2322 then pushes the locking teeth or pins in the seat locking mechanism 22 to release the seat. Second, during the lifting process of the lifting ramp 23121A, the intermediate member 2321 does not contact the linkage 2322. Only when it reaches the highest point of the lifting ramp 23121A (i.e., the outer ring surface of the ring body 2312) does it contact the linkage 2322 to push the locking teeth or pins in the seat locking mechanism 22 to release the seat. Both methods can achieve the effect of unlocking the seat locking mechanism 22 by cooperating with the intermediate component 2321 and the linkage 2322.

[0050] More specifically, such as Figure 7 As shown, the ring body 2312 has a stepped surface 23122 on the side facing the limiting groove 121, and the intermediate member 2321 has a recess 23211. The recess 23211 abuts against the stepped surface 23122 to limit the installation position of the intermediate member 2321 relative to the ring body 2312. A spring groove 23212 is formed on the top of the intermediate member 2321, and a spring for pressing the intermediate member 2321 against the ring body 2312 is installed in the spring groove 23212. The fit between the stepped surface 23122 and the recess 23211 positions the intermediate part 2321 against the ring body 2312 during assembly. The spring ensures that the intermediate part 2321 remains pressed against the ring body 2312 during rotation, preventing it from loosening due to gaps or vibration. This ensures that the ring body 2312 can reliably drive the intermediate part 2321 during rotation and keeps the stroke of the intermediate part 2321 along the lift ramp 23121A stable. The unlocking stroke of the linkage 2322 is also stabilized accordingly. The spring can be a compression spring, a leaf spring, or other elastic element 144 that can provide clamping force.

[0051] As an example, such as Figures 8 to 10 As shown, after one end of the linkage 2322 is pushed by the intermediate part 2321, the other end is engaged with a specific locking pin, key and other structure 24 in an inclined manner to change the direction of force transmission to the axial direction of the seat joint seat 21 (i.e., the seat locking mechanism).

[0052] like Figures 11 to 14 As shown, the rider 11 is a telescopic structure, including an upper tube 111 and a lower tube 112. The upper tube 111 is slidably disposed within the lower tube 112. The hand joint seat 12 includes a connecting arm 12A mounted on the lower tube 112 and a joint seat cavity 12B for mounting the hand locking mechanism. The connecting arm 12A has a connecting channel 122. The hand unlocking mechanism 14 includes a hand transmission component 141 and a hand unlocking component 142. The hand transmission component 141 is disposed within the lower tube 112 and has a transmission rod 1411 extending toward the joint seat cavity 12B and passing through the connecting channel 122 into the joint seat cavity 12B. The hand transmission component 141 is pushed by the upper tube 111 sliding relative to the lower tube 112, which acts on the hand unlocking component 142, thereby unlocking the hand locking mechanism.

[0053] When the upper tube 111 slides relative to the lower tube 112, it pushes the hand transmission component 141. The hand transmission component 141 extends into the joint seat cavity 12B through the connecting channel 122 via the transmission rod 1411, transmitting the motion to the hand unlocking component 142. The hand unlocking component 142 then acts on the hand locking mechanism to release it. This structure uses the extension and retraction of the rider 11 as the power source for hand unlocking. The user does not need to find and operate a separate unlocking component; unlocking can be completed with one hand, making the operation labor-saving and the structure compact. The connecting channel 122 allows the transmission rod 1411 to smoothly enter the joint seat cavity 12B from inside the lower tube 112. Understandably, the hand transmission component 141 and the hand unlocking component 142 can use a ramp, connecting rod, cam, or other structure capable of transmitting the pushing force. The connecting channel 122 can be a through hole, a long slot, or other form through which the transmission rod 1411 can pass. Furthermore, to form a more stable limiting and guiding relationship, the hand transmission component 141 is also provided with a limiting channel 1413 toward the hand joint seat 12. The connecting arm 12A extends a limiting rod 123 toward the limiting channel 1413, and the limiting rod 123 extends into the limiting channel 1413, thereby limiting the movement direction of the hand transmission component 141, so that it slides smoothly along the set direction under the push of the upper tube 111, avoiding the transmission rod 1411 from swaying and affecting the cooperation with the hand unlocking component 142, and ensuring reliable push transmission. It can be understood that the positions of the limiting channel 1413 and the limiting rod 123 can be interchanged, or a guide rail, slide groove or other structure that can limit the movement direction of the hand transmission component 141 can be used.

[0054] In some embodiments of the present invention, the hand locking mechanism is a locking gear 13, and the joint seat cavity 12B is provided with a slot. Specifically, the slot refers to the groove formed by the connection of the two separate seats 12a and 12b. When the locking gear 13 abuts against the two seats 12a and 12b, it is in the locked position. When the locking gear 13 is axially pushed and abuts against only one of them, it is in the unlocked position after disengaging from the slot. The locking gear 13 is axially movable in the joint seat cavity 12B and can engage with the slot in the joint seat cavity 12B to lock the hand joint seat 12. When the locking gear 13 moves axially into the slot, the hand joint seat 12 is locked and cannot rotate. When the locking gear 13 moves axially out of the slot, the hand joint seat 12 is unlocked and the rider 11 is allowed to rotate. This structure has a strong load-bearing capacity, reliable locking, and is easy to arrange in the joint seat cavity 12B.

[0055] In one embodiment, the locking gear 13 is provided with an extension groove 131 for docking and connecting the channel 122. The bottom of the extension groove 131 is provided with an inclined surface, and the hand unlocking member 142 is provided with a corresponding inclined surface. The hand transmission member 141 is pushed by the upper tube 111 sliding relative to the lower tube 112, pushing the hand unlocking member 142. The hand unlocking member 142, through its cooperation with the inclined surface of the extension groove 131, converts the linear motion of the push of the hand transmission member 141 into a linear motion along the axial direction of the hand joint seat 12, so that the locking gear 13 disengages from the slot along the axial direction. This method sets the inclined surface in the extension groove 131 of the locking gear 13, so that the hand unlocking member 142 can directly extend into the extension groove 131 and cooperate with the inclined surface. The structure is compact and suitable for occasions where the space inside the joint seat cavity 12B is limited. The extension groove 131 can also be specifically implemented by a groove, through groove, or other structure that can accommodate the hand unlocking member 142 and set with an inclined surface. Preferably, in order to keep the hand unlocking member 142 moving in a straight line, a groove (not shown) can be provided in the hand joint seat 12. The hand unlocking member 142 can be installed in the groove to achieve the limiting effect. The hand unlocking member 142 is installed into the groove on the other side relative to the inclined surface, so it will not affect the part of the inclined surface mating.

[0056] As an alternative implementation, the hand transmission component 141 and the hand unlocking component 142 are respectively provided with inclined surfaces, forming a transmission through the inclined surface engagement. The hand unlocking component 142 is connected to the hand locking mechanism. The hand transmission component 141 is pushed by the sliding of the upper tube 111 relative to the lower tube 112, and through the inclined surface engagement with the hand unlocking component 142, the linear motion of the upper tube 111 sliding is converted into linear motion along the axial direction of the hand joint seat 12, causing the locking gear 13 to disengage from the slot axially. This method has a simple and compact structure, smooth transmission through the inclined surface engagement, and can reliably convert the sliding of the upper tube 111 into the axial movement of the locking gear 13. Moreover, the inclined surface is flexibly positioned. The inclined surface can also be replaced by a wedge surface, cam surface, or other transmission surface that can convert linear motion into axial motion, as long as it can cause the locking gear 13 to disengage from the slot axially.

[0057] like Figure 15 and Figure 16 As shown, the hand transmission component 141 includes a mounting cavity 1412 opening towards the upper tube 111. The mounting cavity 1412 is provided with a buffer 143 and an elastic element 144. One end of the buffer 143 faces the upper tube 111, and the other end abuts against the elastic element 144. The other end of the elastic element 144 abuts against the inner wall of the mounting cavity 1412. When the upper tube 111 slides relative to the lower tube 112 and pushes against the hand transmission component 141, the upper tube 111 first contacts the buffer 143. The buffer 143 compresses the elastic element 144, and the elastic element 144 absorbs and buffers the impact force transmitted from the upper tube 111, so that the hand transmission component 141 smoothly pushes the hand unlocking component 142 and avoids rigid collision. Understandably, the buffer 143 can be made of elastic materials such as rubber or silicone, and the elastic element 144 can be made of spring, compression spring, sheet metal or other elastic elements. The mounting cavity 1412 can also be realized by a groove, chamber or other structure, as long as it can buffer the push of the upper tube 111 and realize the reset of the hand transmission element 141.

[0058] The following content serves as an explanation of the working principle of this invention: (e.g.) Figures 17 to 19 The diagram illustrates the main actions involved in the entire folding-out process. When folding the scooter, external force first triggers the hand unlocking mechanism 14, releasing the hand locking mechanism and allowing the rider 11 to rotate. As the rider 11 rotates, the hand joint seat 12 moves accordingly, driving the seat unlocking mechanism 23, which in turn releases the seat locking mechanism 22, allowing the seat 2 to fold. During this process, the hand locking mechanism releases before the seat locking mechanism 22. The user only needs one continuous action to complete the step-by-step folding-out process, eliminating the need for separate operations. This simplifies the folding-out procedure while maintaining a safe folding sequence.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the inventive concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A step-folding baby stroller, comprising a foldable frame (1) and a seat (2), the frame (1) comprising a handle (11) and a hand joint seat (12), the handle (11) being pivotally connected to the rest of the frame (1) via the hand joint seat (12), the handle (11) being a telescopic structure comprising an upper tube (111) and a lower tube (112), the upper tube (111) being slidably disposed within the lower tube (112), the hand joint seat (12) being provided with a hand locking mechanism, and a hand unlocking mechanism (14) being provided between the handle (11) and the hand joint seat (12), the upper tube (111) sliding relative to the lower tube (112) pushing against the hand unlocking mechanism (14), thereby unlocking the hand locking mechanism to allow the handle (11) to rotate, characterized in that: The seat (2) is provided with a seat joint seat (21) and is connected to the frame (1) through the seat joint seat (21). The seat joint seat (21) is provided with a seat locking mechanism (22) and also includes a seat unlocking mechanism (23). The seat unlocking mechanism (23) includes a column (231) provided in the hand joint seat (12) and a linkage component (232) that is driven to the column (231). The column (231) rotates synchronously with the hand joint seat (12) and converts the rotational motion of the hand joint seat (12) into a linear motion of the linkage component (232) toward the seat locking mechanism (22), driving the seat locking mechanism (22) to move from the locked position to the unlocked position, so as to allow the seat (2) to be folded or disassembled relative to the frame (1). During the closing process, the hand locking mechanism moves from the locked position to the unlocked position before the seat locking mechanism (22).

2. The baby stroller as described in claim 1, characterized in that: The column (231) includes a platform (2311) arranged along the axial direction of the hand joint seat (12) and an annular body (2312) provided at the end of the platform (2311). An installation groove (23121) is provided on the annular body (23121), and the installation groove (23121) extends circumferentially along the annular body (2312). The linkage assembly (232) includes an intermediate part (2321) and a linkage rod (2322) that form a transmission through a bevel engagement. One side of the intermediate part (2321) extends into the installation groove (23121). When the annular body (2312) rotates with the platform (2311), it drives the intermediate part (2321). The intermediate part (2321) pushes the linkage rod (2322) through the bevel engagement, thereby releasing the seat locking mechanism (22).

3. The baby stroller as described in claim 2, characterized in that: The hand joint seat (12) is provided with a limiting groove (121). The other side of the intermediate part (2321) extends into the limiting groove (121). The limiting groove (121) is configured to restrict the movement direction of the intermediate part (2321), so that the intermediate part (2321) only moves up and down along the radial direction of the ring body (2312). One side wall of the mounting groove (23121) is provided with a lifting ramp (23121A). When the ring body (2312) rotates with the platform (2311), the intermediate part (2321) moves from the bottom to the top of the lifting ramp (23121A). The linkage rod (2322) moves with the intermediate part (2321) by an unlocking stroke. When the intermediate part (2321) reaches the top of the lifting ramp (23121A), the linkage rod (2322) releases the seat locking mechanism (22).

4. The baby stroller as described in claim 3, characterized in that: The ring (2312) has a stepped surface (23122) on the side facing the limiting groove (121), and the intermediate part (2321) has a recess (23211) formed therein. The recess (23211) abuts against the stepped surface (23122) to limit the installation position of the intermediate part (2321) relative to the ring (2312).

5. The baby stroller as described in claim 4, characterized in that: A spring groove (23212) is provided on the top of the intermediate part (2321), and a spring for pressing the intermediate part (2321) toward the ring body (2312) is installed in the spring groove (23212).

6. The baby stroller as described in claim 1, characterized in that: The hand joint seat (12) includes a connecting arm mounted on the lower tube (112) and a joint seat cavity (12B) for mounting the hand locking mechanism. The connecting arm has a connecting channel (122). The hand unlocking mechanism (14) includes a hand transmission member (141) and a hand unlocking member (142). The hand transmission member (141) is located in the lower tube (112) and has a transmission rod (1411) extending toward the joint seat cavity (12B) and through the connecting channel (122) into the joint seat cavity (12B). The hand transmission member (141) is pushed by the upper tube (111) sliding relative to the lower tube (112), which acts on the hand unlocking member (142) to release the hand locking mechanism.

7. The baby stroller as described in claim 6, characterized in that: The hand locking mechanism is a locking gear (13). The joint seat cavity (12B) is provided with a slot. The locking gear (13) is axially movable in the joint seat cavity (12B) and can be engaged in the slot of the joint seat cavity (12B) to lock the hand joint seat (12).

8. The baby stroller as described in claim 7, characterized in that: The hand transmission component (141) and the hand unlocking component (142) are respectively provided with inclined surfaces, and the inclined surfaces cooperate to form a transmission. The hand unlocking component (142) is connected to the hand locking mechanism. The hand transmission component (141) is pushed by the upper tube (111) sliding relative to the lower tube (112). Through the inclined surface cooperation with the hand unlocking component (142), the linear motion of the upper tube (111) sliding is converted into linear motion along the axial direction of the hand joint seat (12), so that the locking gear (13) disengages from the slot along the axial direction.

9. The baby stroller as described in claim 7, characterized in that: The locking gear (13) is provided with an extension groove (131) of the docking connection channel (122). The bottom of the extension groove (131) is provided with an inclined surface. The hand unlocking component (142) is provided with a corresponding inclined surface. The hand transmission component (141) is pushed by the upper tube (111) sliding relative to the lower tube (112), which pushes the hand unlocking component (142). The hand unlocking component (142) converts the linear motion of the push of the hand transmission component (141) into a linear motion along the axial direction of the hand joint seat (12) through the cooperation with the inclined surface of the extension groove (131), so that the locking gear (13) disengages from the slot along the axial direction.

10. The baby stroller as described in claim 6, characterized in that: The hand transmission component (141) includes a mounting cavity (1412) opening towards the upper tube (111). Inside the mounting cavity (1412) are a buffer (143) and an elastic element (144). One end of the buffer (143) faces the upper tube (111), and the other end abuts against the elastic element (144). The other end of the elastic element (144) abuts against the inner wall of the mounting cavity (1412).

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