Baby stroller

Abstract

A fixing seat is fixedly arranged at the upper end of a first supporting leg, a second supporting leg is rotationally connected to the fixing seat, a push rod assembly comprises a lower push rod rotationally connected with the fixing seat, and a rotating seat capable of rotating along with the lower push rod is arranged on the inner side of the fixing seat; the linkage assembly comprises a first connecting rod rotationally connected with the first supporting leg and a second connecting rod rotationally connected with the second supporting leg, the first connecting rod is rotationally connected with the second connecting rod, the lower end of the third connecting rod is rotationally connected with the first connecting rod or the second connecting rod, and a strip-shaped hole is formed in the rotating seat and provided with a first end and a second end. A connecting shaft capable of sliding and rotating in the strip-shaped hole is fixedly arranged at the upper end of the third connecting rod, when the stroller is located at the unfolding position, the connecting shaft stays at the first end, when the stroller is located at the folding position, the connecting shaft slides to the second end, and a foldable seat assembly is further detachably connected to the rotating seat. The folding chair is simple in structure and flexible to fold.

Description

Technical Field

[0001] This invention relates to a children's stroller. Background Technology

[0002] Strollers are common products used during an infant's growth. Most strollers on the market can be unfolded or folded; when unfolded, they are used for carrying infants and toddlers, and when folded, they are convenient for carrying or storing. However, the structures of strollers on the market vary, and their folding mechanisms and principles differ. Therefore, this invention provides a novel stroller that differs from existing technologies. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a child stroller with a simple structure and flexible folding mechanism.

[0004] This invention is achieved through the following technical solution:

[0005] A stroller, movable from an unfolded position to a folded position after a locking device is unlocked, includes a bottom support frame. The bottom support frame includes a first leg, with a fixed base fixed to the upper end of the first leg. A second leg is rotatably connected to the fixed base about a first axis. Wheels are provided at the lower ends of the second leg and the first leg. A push rod assembly is also connected to the fixed base. The push rod assembly includes a lower push rod rotatably connected to the fixed base about a second axis. A rotating seat is fixedly connected to the lower push rod and can rotate with the lower push rod inside the fixed base. A linkage component is provided between the rotating seat and the bottom support frame, which can drive the second leg to rotate towards the first leg when the push rod assembly rotates towards the first leg. The linkage component includes a component that rotates around a third axis with the first leg. The stroller has a first connecting rod that is rotatably connected to the second leg and a second connecting rod that is rotatably connected to the second leg around the fourth axis. The first connecting rod and the second connecting rod are rotatably connected to the fifth axis. A third connecting rod is provided between the rotating seat and the first or second connecting rod and is movably connected to both of them. The lower end of the third connecting rod is rotatably connected to the first or second connecting rod around the sixth axis. The rotating seat has a strip-shaped hole with a first end and a second end. The upper end of the third connecting rod is fixedly provided with a connecting shaft that can slide and rotate in the strip-shaped hole. When the stroller is in the unfolded position, the connecting shaft stays at the first end of the strip-shaped hole. When the stroller is in the folded position, the connecting shaft slides to the second end of the strip-shaped hole. A foldable seat assembly can also be detachably connected to the rotating seat.

[0006] The fixed seat includes an outer seat body and an inner seat body fixedly connected to the outer seat body. The first leg and the second leg are connected to the outer seat body. The outer seat body is provided with an opening groove. The lower push rod is provided with a connecting piece that is inserted into the opening groove. The connecting piece is rotatably connected to the outer seat body around a second axis. The rotating seat is fixedly connected to the connecting piece through a fixed shaft on it. The inner seat body and the outer seat body are provided with arc-shaped clearance grooves for the fixed shaft to move inward.

[0007] The stroller also includes a semi-folded position between the unfolded position and the folded position. The rotating base is provided with a locking component for locking the position of the connecting shaft. When the stroller is in the unfolded position and when the stroller moves from the unfolded position to the semi-folded position, the locking component locks the connecting shaft at the first end of the slot. When the stroller continues to move from the semi-folded position to the folded position, the locking component unlocks and allows the connecting shaft to move to the second end of the slot.

[0008] The locking assembly includes a sliding block that can slide within the rotating seat. The sliding block has a blocking wall that prevents the connecting shaft from sliding towards the second end within the slot when it is in the locked position. The inner seat has a pushing part that can push the sliding block. When the stroller is in the unfolded position and when the stroller moves from the unfolded position to the semi-folded position, the pushing part keeps pressing against the sliding block to keep the sliding block in the locked position. A first return spring is also provided between the sliding block and the rotating seat. When the stroller moves from the semi-folded position to the folded position, the rotating seat drives the sliding block to move, causing the sliding block to disengage from the pushing part, and the first return spring pushes the sliding block to move, causing the blocking wall to disengage from the connecting shaft.

[0009] The locking device includes a locking groove on the lower push rod, a locking block that can engage or disengage from the locking groove is slidably disposed in the outer seat, a second return spring is disposed between the locking block and the fixed seat, a push assembly that can push the locking block out of the locking groove is slidably disposed in the lower push rod, and a telescopic upper push rod is also slidably connected in the lower push rod. When the upper push rod retracts into the lower push rod, the lower end of the upper push rod pushes the push assembly, causing the push assembly to push the locking block out of the locking groove. A third return spring that can push the push assembly to return to its original position is also disposed in the lower push rod.

[0010] The lower part of the push rod is curved. The push assembly includes a first push rod that contacts and engages with the locking block. The lower part of the push rod also has a second push rod that engages with the first push rod through an inclined surface. The upper end of the second push rod has a stop part that can be pushed by the lower end of the push rod. A third return spring is located between the stop part and the push rod.

[0011] The locking block consists of two spaced-apart blocks that are fixedly connected by a connecting rod. The two blocks are located inside the outer seat and on both sides of the opening slot. The locking slot is located at the lower end of the push rod and on both sides of the connecting piece.

[0012] The seat assembly includes a connecting seat detachably connected to a rotating seat, a locking structure between the connecting seat and the rotating seat, a seat portion that can rotate relative to the connecting seat, a backrest portion that can rotate relative to the seat portion at the rear end of the seat portion, an armrest portion that can rotate relative to the seat portion at the rear end of the seat portion, a first engaging structure between the armrest portion and the seat portion, a second engaging structure between the backrest portion and the seat portion, and a third engaging structure between the seat portion and the connecting seat. When the second engaging structure is unlocked and the backrest portion rotates and folds relative to the seat portion, the backrest portion drives the third engaging structure and the first engaging structure to unlock sequentially.

[0013] The locking structure includes a locking groove on a rotating base, a locking block on a connecting base that can engage or disengage from the locking groove, and an exposed unlocking rod on the connecting base. The unlocking rod and the locking block are engaged by a bevel, so that when the unlocking rod moves, the unlocking rod pushes the locking block to disengage from the locking groove. A fourth return spring is provided between the connecting base and the unlocking rod to push the unlocking rod back to its original position, and a fifth return spring is provided between the locking block and the connecting base to push the locking block back to its original position.

[0014] The seat includes a seat plate with an inner protrusion and spaced-apart outer protrusions on its rear side. The armrest includes an armrest piece rotatably connected between the inner and outer protrusions, with armrest bars on the armrest piece. The backrest is connected between the outer protrusions and a connecting seat. The third engagement structure includes a third engagement groove on the connecting seat along the circumferential direction, a third locking groove on the outer protrusion along the circumferential direction, a sliding seat slidably disposed between the outer protrusion and the connecting seat, a spline tooth on the sliding seat that can engage simultaneously with the third locking groove and the third engagement groove, a first inclined surface on the sliding seat along the circumferential direction, and a first inclined boss on the backrest that can push against the first inclined surface when it is rotated and folded relative to the seat. When the first inclined boss pushes the first inclined surface, the sliding seat moves laterally, causing the spline teeth to disengage from the third engagement groove. A sixth return spring is also provided between the outer boss and the sliding seat to push the sliding seat back to its original position. The first engagement structure includes a first engagement groove provided on the inner boss along the circumferential direction, a first locking groove provided on the armrest along the circumferential direction, an engagement block that can engage with the first engagement groove and the first locking groove simultaneously is provided between the armrest and the inner boss, and a pusher post is provided on the sliding seat that passes through the outer boss and can push the engagement block to disengage from the first engagement groove when it is pushed and slid by the first inclined boss. A seventh return spring is also provided between the inner boss and the engagement block to push the engagement block back to its original position.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. When folding the stroller of this invention, the seat assembly is folded first, and then the push rod assembly rotates relative to the fixed seat, moving towards the first leg. During this process, the rotating seat follows the rotation of the push rod assembly, driving the third link upwards. The lower end of the third link lifts the first or second link, causing the connection point of the first and second links to move upwards. The lower ends of the first and second links then pull the first and second legs closer together. Furthermore, during the folding process, the connecting shaft at the upper end of the third link moves from the first end to the second end of the slot on the rotating seat, ensuring that the push rod assembly and the second leg can be tightly brought together onto the first leg, minimizing the space occupied by the stroller after folding. The entire folding process only requires folding the seat assembly first, and then rotating the folding push rod assembly to achieve the folding of the bottom support frame; the overall folding action is flexible and reliable.

[0017] 2. The stroller of the present invention includes an unfolded position, a semi-folded position, and a folded position. When the stroller is in the unfolded position and during the process of moving from the unfolded position to the semi-folded position, the connecting shaft at the upper end of the third link remains at the first end of the strip hole, so that the stroller is stable in the unfolded state. When folding, it also ensures that the stroller can reliably pull the second leg towards the first leg during the process of moving from the unfolded position to the semi-folded position. During the process of moving the stroller from the semi-folded position to the folded position, the connecting shaft can slide from the first end to the second end of the strip hole. This allows the push rod assembly and the rotating seat to continue to rotate relative to the fixed seat, so that the push rod assembly can further move towards the first leg, ensuring that the stroller is more compact after folding.

[0018] 3. During the unfolded position and the movement of the stroller from the unfolded position to the semi-folded position, the pushing part on the inner seat of this invention maintains pressure on the sliding block, causing the blocking wall on the sliding block to block the connecting shaft and prevent the connecting shaft from sliding within the slot. This ensures stable unfolding of the stroller and ensures flexible folding of the second and first legs during folding. When the stroller moves from the semi-folded to the folded position, the rotation of the rotating seat causes the sliding block to disengage from the pushing part. The first return spring pushes the sliding block back to its original position, and the blocking wall no longer blocks the connecting shaft. The connecting shaft then slides from the first end to the second end of the slot, allowing the rotating seat and push rod assembly to rotate further for folding, ensuring a compact size when the stroller is folded. Therefore, the positioning, locking, and unlocking of the connecting shaft are accomplished through the cooperation of the pushing part, the sliding block, and the first return spring, eliminating the need for additional unlocking operations and achieving automatic unlocking, making the folding operation of the stroller convenient and quick. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 This is a side view of the present invention;

[0021] Figure 3 This is one of the perspective views of the components of the present invention;

[0022] Figure 4 This is a second perspective view of a component of the present invention;

[0023] Figure 5 This is one of the exploded views of the components of the present invention;

[0024] Figure 6 This is a second exploded view of the components of the present invention;

[0025] Figure 7 This is one of the cross-sectional views of the components of the present invention;

[0026] Figure 8 This is the third exploded view of the components of the present invention;

[0027] Figure 9 This is a second cross-sectional view of a component of the present invention;

[0028] Figure 10 This is a side view of the invention in a semi-folded position;

[0029] Figure 11 This is a side view of the invention in its folded position;

[0030] Figure 12 This is the third cross-sectional view of a component of the present invention;

[0031] Figure 13 This is the fourth cross-sectional view of a component of the present invention;

[0032] Figure 14 This is the fifth cross-sectional view of a component of the present invention;

[0033] Figure 15 This is a perspective view of the seat assembly of the present invention;

[0034] Figure 16 This is the fourth exploded view of the components of the present invention;

[0035] Figure 17 This is the fifth exploded view of the components of the present invention. Detailed Implementation

[0036] The present invention will now be further described with reference to the accompanying drawings:

[0037] As attached Figure 1 As shown, this embodiment provides a foldable stroller. The stroller mainly includes a bottom support frame 1, a push rod assembly 2, a rotating seat 3, a linkage assembly 4, and a detachable seat assembly 5.

[0038] like Figures 1 to 9As shown, the bottom support frame 1 includes a first leg 11 and a second leg 12. A fixed seat 13 is fixedly mounted on the upper end of the first leg 11. The upper end of the second leg 12 is rotatably connected to the fixed seat 13 around the first axis A, thereby allowing the second leg 12 to rotate relative to the first leg 11. Both the first leg 11 and the second leg 12 are equipped with wheels 14 at their lower ends for easy movement. The fixed seat 13 consists of an outer seat body 131 and an inner seat body 132 fixed to its inner side by screws or rivets, providing a stable structure and facilitating the installation of internal components. The first leg 11 and the second leg 12 are connected to the outer seat body 131. The push rod assembly 2 includes a lower push rod 21, the lower end of which is provided with a connecting piece 22. This connecting piece 22 is inserted into an opening slot 133 on the outer seat body 131 and is rotatably connected to the fixed seat 13 around the second axis B via a pin. A rotating seat 3 is provided on the inner side of the fixed seat 13. The rotating seat 3 is fixedly connected to the connecting piece 22 through the fixed shaft 31 on it, so that the rotating seat 3 can rotate around the second axis B together with the lower push rod 21. The inner seat body 132 and the outer seat body 131 are respectively provided with arc-shaped clearance grooves 134, which allow the fixed shaft 31 to move during rotation, providing movement space for linkage folding and ensuring smooth operation.

[0039] like Figures 1 to 14 As shown, a linkage assembly 4 is provided between the rotating base 3 and the bottom support frame 1. This linkage assembly 4 includes a first connecting rod 41, a second connecting rod 42, and a third connecting rod 43. One end of the first connecting rod 41 is rotatably connected to the first support leg 11 about a third axis C; one end of the second connecting rod 42 is rotatably connected to the second support leg 12 about a fourth axis D; the first connecting rod 41 and the second connecting rod 42 are also rotatably connected about a fifth axis E via a pin. The lower end of the third connecting rod 43 is rotatably connected to the second connecting rod 42 (or, in another embodiment, to the first connecting rod 41) about a sixth axis F, and the upper end of the third connecting rod 43 is movably connected to the rotating base 3 via a connecting shaft 45. Specifically, a strip-shaped hole 44 is provided on the rotating base 3, the strip-shaped hole 44 having a first end 441 and a second end 442. The connecting shaft 45 passes through the strip-shaped hole 44 and can slide along it and rotate within it.

[0040] like Figure 2 , Figure 10 and Figure 11As shown, the stroller can be positioned in three ways: unfolded, semi-folded, and folded. When the stroller is in the unfolded position, the connecting shaft 45 is positioned at the first end 441 of the slot 44. At this time, the first leg 11 and the second leg 12 are open, and the frame is stable. When folding is required, the locking device is first unlocked (described later), and then the push rod assembly 2 is rotated backward (towards the first leg 11). The lower push rod 21 drives the rotating seat 3 to rotate around the second axis B. Since the connecting shaft 45 is initially locked at the first end 441 of the slot 44, the rotation of the rotating seat 3 will push the second connecting rod 42 through the third connecting rod 43. Then, through the hinge of the first connecting rod 41 and the second connecting rod 42, the second leg 12 is forced to rotate around the first axis A toward the first leg 11, thus achieving the initial folding of the bottom support frame 1. Therefore, to ensure the stability of the folding action of the bottom support frame 1, during the process of the stroller moving from the unfolded position to the semi-folded position, the connecting shaft 45 is always restricted by a locking component 6 to the first end 441 of the strip hole 44, making the linkage rigid, the folding action stable and controllable, and ensuring that the bottom support frame 1 can be stably and reliably folded when the push rod assembly 2 rotates and folds. The locking component 6 is located inside the rotating seat 3 and includes a sliding block 61 that can slide inside it. The sliding block 61 is provided with a blocking wall 62, and a protruding pushing part 135 is provided on the inner seat body 132. When the stroller is in the unfolded position and moves from the unfolded position to the semi-folded position, since the rotation angle of the rotating seat 3 relative to the fixed seat 13 is still small, the pushing part 135 on the inner seat body 132 continuously presses against the sliding block 61, overcoming the elastic force of the first return spring 63, so that the sliding block 61 is kept in a "locked position". At this point, the blocking wall 62 of the sliding block 61 is located laterally on the connecting shaft 45 in the slot 44, preventing the connecting shaft 45 from sliding from the first end 441 to the second end 442 of the slot 44. When the stroller moves from the half-folded position to the folded position, the rotating seat 3 drives the sliding block 61 inside it to rotate to a specific angle, so that the sliding block 61 is completely removed from the pressing range of the pushing part 135 on the inner seat 132. Under the restoring force of the first return spring 63, the sliding block 61 is pushed and moved, and its blocking wall 62 moves away, no longer blocking the connecting shaft 45. At this point, the connecting shaft 45 is unlocked and can slide in the slot 44. After the connecting shaft 45 is unlocked, the push rod assembly 2 can continue to rotate and move closer to the first support leg 11. The rotational movement of the rotating seat 3 is no longer completely converted into pulling on the third connecting rod 43, and the connecting shaft 45 begins to slide from the first end 441 to the second end 442 of the slot 44. This ingenious design allows the push rod assembly 2 to continue pressing down to a position closer to the first leg 11 during the later stages of folding, after the first leg 11 and the second leg 12 have already been closed and folded together. This minimizes the final folded volume, while the automatic unlocking of the locking assembly 6 ensures that the entire folding process is completed in one go without the need for secondary operation.

[0041] like Figures 4 to 8 As shown, the locking device of the stroller includes a locking groove 71 located at the lower end of the lower push rod 21. A locking block 72 is slidably disposed within the outer seat body 131 of the fixed base 13. In this embodiment, the locking block 72 is formed by two spaced blocks 721 fixedly connected by a connecting rod 722. The two blocks 721 are located on both sides of the opening groove 133, and two corresponding locking grooves 71 are also provided on both sides of the connecting piece 22, thereby ensuring a secure and reliable lock between the lower push rod 21 and the fixed base 13. A second return spring 73 is provided between the locking block 72 and the fixed base 13. Under normal conditions, its elastic force drives the two blocks 721 upwards into the locking groove 71 of the lower push rod 21, thereby locking the push rod assembly 2 and the fixed base 13.

[0042] like Figures 3 to 8 As shown, the lower push rod 21 contains a retractable upper push rod 23 for easy pushing by the user. When the stroller is folded, the upper push rod 23 retracts into the lower push rod 21. When the upper push rod 23 retracts into the lower push rod 21, its lower end pushes the push assembly 74 located at the lower part of the lower push rod 21. The push assembly 74 includes a first push rod 741 and a second push rod 742. The upper end of the second push rod 742 has a stop part 743 that is pushed by the lower end of the upper push rod 23, and its lower end engages with the first push rod 741 through an inclined surface. When the upper push rod 23 retracts, it pushes the second push rod 742 downward, driving the first push rod 741 to move through the inclined surface. The first push rod 741 then pushes the locking block 72, disengaging it from the locking groove 71, thus unlocking the stroller. The lower part of the lower push rod 21 is designed to be curved, providing reasonable space for the push assembly 74. This unlocking mechanism uses the action of the upper push rod 23 directly as the unlocking trigger condition, making operation simpler and more convenient.

[0043] like Figure 1 , Figure 4 , Figure 9 as well as Figures 15 to 17 As shown, the seat assembly 5 is detachably connected to the rotating seat 3 via its connecting seat 51. The two are fixed together by a locking structure 84. Specifically, the rotating seat 3 has a locking groove 841, and the connecting seat 51 has a locking block 842 that automatically springs into the locking groove 841 under the action of the fifth return spring 845. By operating the exposed unlocking lever 843, the unlocking lever 843 overcomes the elastic force of the fourth return spring 844 during its movement, and the unlocking lever 843 pushes the locking block 842 through the inclined surface, overcoming the elastic force of the fifth return spring 845, causing the locking block 842 to disengage from the locking groove 841, thus allowing the entire seat assembly 5 to be lifted upwards and removed.

[0044] like Figure 2 , Figure 10 as well as Figures 15 to 17As shown, the seat assembly 5 itself is also foldable. It includes a seat portion 52 that can rotate relative to the connecting seat 51, and a backrest 53 and armrest portion 54 that can rotate relative to the seat portion 52. The three are locked together by a third engaging structure 83, a second engaging structure 82, and a first engaging structure 81, respectively. The seat portion 52 includes a seat plate 521, with an inner protrusion 522 and an outer protrusion 523 spaced apart on the rear side of the seat plate 521. The armrest portion 54 includes an armrest piece 541 rotatably connected between the inner protrusion 522 and the outer protrusion 523, with an armrest bar 542 on the armrest piece 541. The backrest 53 is connected between the outer protrusion 523 and the connecting seat 51. The second engaging structure 82 includes an engaging rod 822 provided in the backrest 53, which can be engaged into the second engaging groove 821 at different positions on the outside of the outer protrusion 523 under the action of the eighth return spring 825, thereby realizing the angle adjustment of the backrest 53. Rotating the handle 824 at the top of the backrest 53 and pulling the locking rod 822 out of the second locking groove 821 via the pull rope 823 releases the lock on the backrest 53, allowing it to be folded forward. When the backrest 53 is unlocked and folded forward, the first inclined boss 836 fixed on it rotates accordingly. The first inclined boss 836 pushes against the first inclined surface 835 on the sliding seat 833 located between the outer protrusion 523 and the connecting seat 51, forcing the sliding seat 833 to slide laterally and compressing the sixth return spring 837. The spline teeth 834 on the sliding seat 833, which were originally locked in the third locking groove 831 of the connecting seat 51 and the third locking groove 832 of the outer protrusion 523, locking the seat part 52 and the connecting seat 51, are disengaged from the third locking groove 831 by the lateral movement of the sliding seat 833, thereby automatically releasing the third locking structure 83 between the seat part 52 and the connecting seat 51. Simultaneously, during the sliding process of the sliding seat 833, the pushing post 838 on it moves along with it. The pushing post 838 passes through the outer protrusion 523 and pushes against the engaging block 813 located between the armrest piece 541 and the inner protrusion 522. The engaging block 813 was originally engaged in the first locking groove 812 of the armrest piece 541 and the first engaging groove 811 of the inner protrusion 522 under the action of the seventh return spring 814, locking the armrest part 54 in the upright state. After the engaging block 813 is pushed, the engaging block 813 disengages from the first engaging groove 811, thereby automatically releasing the first engaging structure 81. Thus, with only one action (folding down the backrest 53), the triple sequential unlocking of the backrest 53, seat part 52, and armrest part 54 is triggered. The user can then very smoothly flip the backrest 53, seat part 52, and armrest part 54 together to the folded position. Folding the backrest 53 unlocks the third locking mechanism 83 and the first locking mechanism 81 in sequence, making the stroller folding very convenient and quick.

[0045] Therefore, when the stroller in this embodiment needs to be folded, first turn the handle 824 to unlock the second locking structure 82, then turn the backrest 53 forward. During the folding process, the backrest 53 causes the armrest 54 to fold and the seat 52 to unlock from the connecting seat 51. At this point, the folded backrest 53, armrest 54, and seat 52 can be flipped backward to their folded position. Next, operate the push rod 23 to retract and unlock the locking device. Finally, turn the push rod assembly 2. During the folding process, the push rod assembly 2 drives the second leg 12 to move closer to the first leg 11. After the first leg 11 and the second leg 12 are brought together and folded, the push rod assembly 2 can continue to rotate and move further closer to the first leg 11. The entire folding process is very convenient and quick, can be operated with one hand, and takes up little space after folding.

[0046] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.

Claims

1. A stroller that can be moved from an unfolded position to a folded position after the locking device is unlocked, characterized in that: The system includes a bottom support frame (1), which includes a first leg (11). A fixed seat (13) is fixedly provided on the upper end of the first leg (11). A second leg (12) is rotatably connected to the fixed seat (13) around a first axis (A). Wheels (14) are provided at the lower ends of the second leg (12) and the first leg (11). A push rod assembly (2) is also connected to the fixed seat (13). The push rod assembly (2) includes a lower part that is rotatably connected to the fixed seat (13) around a second axis (B). The push rod (21) has a rotating seat (3) on its inner side that is fixedly connected to the lower push rod (21) and can rotate with the lower push rod (21). A linkage assembly (4) is provided between the rotating seat (3) and the bottom support frame (1) to drive the second support leg (12) to rotate and move towards the first support leg (11) when the push rod assembly (2) rotates and moves towards the first support leg (11). The linkage assembly (4) includes a first connecting rod (41) that is rotatably connected to the first support leg (11) around the third axis (C) and a second connecting rod (41) that is rotatably connected to the second support leg (11). The leg (12) is rotatably connected to the second link (42) around the fourth axis (D). The first link (41) and the second link (42) are rotatably connected around the fifth axis (E). The rotating seat (3) is provided with a third link (43) movably connected to either the first link (41) or the second link (42). The lower end of the third link (43) is rotatably connected to either the first link (41) or the second link (42) around the sixth axis (F). The rotating seat (13) is provided with a strip hole (44). (44) has a first end (441) and a second end (442). The upper end of the third link (43) is fixed with a connecting shaft (45) that can slide and rotate in the strip hole (44). When the stroller is in the unfolded position, the connecting shaft (45) stays at the first end (441) of the strip hole (44). When the stroller is in the folded position, the connecting shaft (45) slides to the second end (442) of the strip hole (44). A foldable seat assembly (5) can also be detachably connected to the rotating seat (3).

2. The stroller according to claim 1, characterized in that: The fixed seat (13) includes an outer seat body (131) and an inner seat body (132) fixedly connected to the outer seat body (131). The first leg (11) and the second leg (12) are connected to the outer seat body (131). The outer seat body (131) is provided with an opening groove (133). The lower push rod (21) is provided with a connecting piece (22) inserted into the opening groove (133). The connecting piece (22) is rotatably connected to the outer seat body (131) around the second axis (B). The rotating seat (3) is fixedly connected to the connecting piece (22) through a fixed shaft (31) on it. The inner seat body (132) and the outer seat body (131) are provided with arc-shaped clearance grooves (134) for the fixed shaft (31) to move inward.

3. The stroller according to claim 2, characterized in that: The stroller also includes a semi-folded position between the unfolded position and the folded position. The rotating seat (3) is provided with a locking component (6) for locking the position of the connecting shaft (45). When the stroller is in the unfolded position and when the stroller moves from the unfolded position to the semi-folded position, the locking component (6) locks the connecting shaft (45) at the first end (441) of the slot (44). When the stroller continues to move from the semi-folded position to the folded position, the locking component (6) unlocks and allows the connecting shaft (45) to move to the second end (442) of the slot (44).

4. The stroller according to claim 3, characterized in that: The locking assembly (6) includes a sliding block (61) that can slide within the rotating seat (3). The sliding block (61) has a blocking wall (62) that prevents the connecting shaft (45) from sliding towards the second end (442) within the slot (44) when it is in the locked position. The inner seat (132) has a pushing part (135) that can push the sliding block (61). The pushing part is used when the stroller is in the unfolded position and when the stroller moves from the unfolded position to the semi-folded position. (135) The sliding block (61) is kept pressed down so that the sliding block (61) is in the locked position. A first return spring (63) is also provided between the sliding block (61) and the rotating seat (3). When the stroller moves from the half-folded position to the folded position, the rotating seat (3) drives the sliding block (61) to move so that the sliding block (61) is disengaged from the push part (135), and the first return spring (63) pushes the sliding block (61) to move so that the blocking wall (62) is disengaged from the connecting shaft (45).

5. The stroller according to any one of claims 2 to 4, characterized in that: The locking device includes a locking groove (71) on the lower push rod (21), a locking block (72) that can engage or disengage from the locking groove (71) is slidably provided in the outer seat (131), a second return spring (73) is provided between the locking block (72) and the fixed seat (13), a push assembly (74) that can push the locking block (72) out of the locking groove (71) is slidably provided in the lower push rod (21), and a telescopic upper push rod (23) is also slidably connected in the lower push rod (21). When the upper push rod (23) retracts into the lower push rod (21), the lower end of the upper push rod (23) pushes the push assembly (74) to push the locking block (72) out of the locking groove (71). A third return spring (75) that can push the push assembly (74) to reset is also provided in the lower push rod (21).

6. The stroller according to claim 5, characterized in that: The lower part of the push rod (21) is curved. The push assembly (74) includes a first push rod (741) that contacts and cooperates with the locking block (72). The lower part of the push rod (21) is also provided with a second push rod (742) that cooperates with the first push rod (741) through an inclined surface. The upper end of the second push rod (742) is provided with a stop part (743) that can be pushed by the lower end of the push rod (23). The third return spring (75) is provided between the stop part (743) and the push rod (21).

7. The stroller according to claim 5, characterized in that: The locking block (72) includes two blocks (721) spaced apart from each other. The two blocks (721) are fixedly connected by a connecting rod (722). The two blocks (721) are located inside the outer seat (131) and on both sides of the opening groove (133). The locking groove (71) is located at the lower end of the push rod (21) and on both sides of the connecting piece (22).

8. The stroller according to claim 1, characterized in that: The seat assembly (5) includes a connecting seat (51) detachably connected to the rotating seat (3). A locking structure (84) is provided between the connecting seat (51) and the rotating seat (3). The connecting seat (51) is provided with a seat part (52) that can rotate relative to it. The rear end of the seat part (52) is provided with a backrest (53) that can rotate relative to it. The rear end of the seat part (52) is also provided with an armrest part (54) that can rotate relative to it. A first engaging structure (81) is provided between the armrest part (54) and the seat part (52). A second engaging structure (82) is provided between the backrest (53) and the seat part (52). A third engaging structure (83) is provided between the seat part (52) and the connecting seat (51). When the second engaging structure (82) is unlocked and the backrest (53) rotates and folds relative to the seat part (52), the backrest (53) drives the third engaging structure (83) and the first engaging structure (81) to unlock sequentially.

9. The stroller according to claim 8, characterized in that: The locking structure (84) includes a locking groove (841) on the rotating seat (3), a locking block (842) on the connecting seat (51) that can engage or disengage from the locking groove (841), and an exposed unlocking rod (843) on the connecting seat (51). The unlocking rod (843) and the locking block (842) are engaged by a bevel, so that when the unlocking rod (843) moves, the unlocking rod (843) pushes the locking block (842) to disengage from the locking groove (841). A fourth return spring (844) is provided between the connecting seat (51) and the unlocking rod (843) to push the unlocking rod (843) to reset. A fifth return spring (845) is provided between the locking block (842) and the connecting seat (51) to push the locking block (842) to reset.

10. The stroller according to claim 8, characterized in that: The seat portion (52) includes a seat plate (521), with an inner protrusion (522) and an outer protrusion (523) spaced apart from each other on the rear side of the seat plate (521). The armrest portion (54) includes an armrest piece (541) rotatably connected between the inner protrusion (522) and the outer protrusion (523), with an armrest bar (542) on the armrest piece (541). The backrest (53) is connected between the outer protrusion (523) and the connecting seat (51). The third engaging structure (83) includes a third engaging groove provided on the connecting seat (51) along the circumferential direction. (831) The outer protrusion (523) is provided with a third locking groove (832) along the circumferential direction. A sliding seat (833) is slidably provided between the outer protrusion (523) and the connecting seat (51). The sliding seat (833) is provided with spline teeth (834) that can engage with the third locking groove (832) and the third engaging groove (831) simultaneously. The sliding seat (833) is also provided with a first inclined surface (835) along the circumferential direction. The backrest (53) is provided with a first inclined surface (835) that can push against it when it rotates and folds relative to the seat part (52). When the first inclined boss (836) pushes against the first inclined surface (835), the sliding seat (833) moves laterally, causing the spline teeth (834) to disengage from the third engagement groove (831). A sixth return spring (837) is also provided between the outer boss (523) and the sliding seat (833) to push the sliding seat (833) back to its original position. The first engagement structure (81) includes a first engagement groove (811) provided on the inner boss (522) along the circumferential direction. A first locking groove (811) is provided on the armrest piece (541) along the circumferential direction. 12) The armrest piece (54) and the inner protrusion (522) are provided with a locking block (813) that can simultaneously engage with the first locking groove (811) and the first locking groove (812). The sliding seat (833) is provided with a pusher (838) that passes through the outer protrusion (523) and can push the locking block (813) to disengage from the first locking groove (811) when it is pushed and slid by the first inclined protrusion (836). The inner protrusion (522) and the locking block (813) are also provided with a seventh return spring (814) that can push the locking block (813) to reset.

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