Baby stroller

Abstract

The utility model discloses a child stroller which comprises a push rod, a front leg connected with wheels and a rear leg, the upper end of the rear leg is fixedly provided with a connecting base, the upper end of the front leg is fixedly provided with a first connecting piece capable of rotating around a first axis A with the connecting base, and the lower end of the push rod is fixedly provided with a second connecting piece capable of rotating around a second axis B with the connecting base. A third connecting piece is further rotationally connected to the connecting base around a third axis C. A first transmission piece which is hinged to the second connecting piece and the third connecting piece and can pull the third connecting piece to rotate when the push rod rotates and is folded relative to the rear leg is arranged between the second connecting piece and the third connecting piece. A second transmission sheet is arranged between the third connecting sheet and the first connecting sheet, is hinged with the third connecting sheet and the first connecting sheet and can pull the first connecting sheet to rotate relative to the connecting seat when the first transmission sheet drives the third connecting sheet to rotate so as to enable the front legs to approach and fold towards the rear legs. The folding chair is simple in structure and flexible to fold and unfold.

Description

Technical field

[0001] The utility model relates to a baby stroller. [Background Technology]

[0002] Strollers are common products for infants and young children as they grow. For convenience, strollers currently on the market are generally capable of unfolding or folding. The unfolded position allows children to travel, while the folded position allows for easy portability or storage. Furthermore, strollers currently on the market come in a variety of designs, with varying folding mechanisms and operating principles. Therefore, the present invention provides a novel stroller that differs from existing technologies. [Utility Model Content]

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a child stroller with a simple structure and flexible folding and unfolding.

[0004] The utility model is realized through the following technical solutions:

[0005] A child stroller that can be moved from an unfolded position to a folded position after a locking device is unlocked, includes a push rod and front legs and rear legs connected to wheels, the upper end of the rear leg is fixedly provided with a connecting seat, the upper end of the front leg is fixedly provided with a first connecting piece that can rotate with the connecting seat around a first axis A, the lower end of the push rod is fixedly provided with a second connecting piece that can rotate with the connecting seat around a second axis B, and the connecting seat is also rotatably connected to a third connecting piece around a third axis C, a first transmission piece is provided between the second and third connecting pieces and is hinged to the two and can pull the third connecting piece to rotate when the push rod is rotated relative to the rear leg and folded, a second transmission piece is provided between the third connecting piece and the first connecting piece and is hinged to the two and can pull the first connecting piece to rotate relative to the connecting seat when the first transmission piece drives the third connecting piece to rotate so that the front legs are folded closer to the rear legs.

[0006] The locking device includes a locking groove provided at the lower end of the push rod, a locking block is provided in the connecting seat which can slide therein and engage or disengage with the locking groove, a driving rod is also provided in the connecting seat which is movably connected to the locking block and can drive the locking block to disengage from the locking groove or engage the block, an operating block is provided on the driving rod which is exposed to the connecting seat, and a first reset spring is also provided in the connecting seat to push the driving rod to slide and reset.

[0007] A first bayonet is provided at the outer edge of the second connecting piece, and a protruding block is provided on the driving rod which can engage or disengage with the first bayonet when sliding. One end of the first return spring rests on the block and the other end rests on the connecting seat.

[0008] The third connecting piece is provided with a hook, and the first connecting piece is provided with a second latch. When the stroller is in the unfolded state, the hook is engaged with the second latch. When the push rod is rotated and folded relative to the rear leg, the first transmission piece pulls the third connecting piece to rotate, so that the hook is disengaged from the second latch.

[0009] The connecting seat is provided with a seat connecting portion, and the seat connecting portion is detachably connected to a foldable seat assembly. When the seat assembly is rotated and folded relative to the rear legs, the seat assembly drives the operating block to move so that the locking device is unlocked.

[0010] The seat assembly includes a snap-in base that is detachably engaged with the seat connecting part, a seat connecting ring that can be rotated relative to the snap-in base is connected to the seat connecting ring, a seat rod is provided on the seat connecting ring, a first locking mechanism for locking the seat connecting ring and the snap-in base is provided between the seat connecting ring and the snap-in base, a backrest hinged base is rotatably connected to the seat connecting ring, a second locking mechanism for locking the backrest hinged base and the snap-in base or the seat connecting ring is provided between the backrest hinged base and the snap-in base, a backrest rod is connected to the backrest hinged base, an unlocking switch for driving the second locking mechanism to unlock is provided at the upper end of the backrest rod, and an unlocking part is provided on the backrest hinged base that can drive the first locking mechanism to unlock when the backrest hinged base is rotated and folded relative to the seat connecting ring.

[0011] The second locking mechanism includes a plurality of first slots provided on the card connection seat along the circumferential direction, a plurality of second slots provided on the backrest hinge seat along the circumferential direction, a gear that can move laterally and engage with the first slot and the second slot at the same time is provided in the space enclosed by the card connection seat and the backrest hinge seat, a movable block that can rotate and move laterally is provided between the gear and the backrest hinge seat, a plurality of oblique slots are provided on the movable block along the circumferential direction, the backrest hinge seat is provided with an oblique protrusion that cooperates with the oblique slot and can push the movable block to move laterally when the movable block rotates, and when the movable block is pushed and moves laterally, the movable block pushes the gear to disengage from the second slot, and a second reset spring that can push the gear to move laterally and reset is also provided between the gear and the card connection seat, and the movable block is connected to the unlocking switch by a pull rope.

[0012] The first locking mechanism includes a plurality of first engaging grooves arranged on the seat connecting ring along the circumferential direction, a plurality of second engaging grooves are provided on the engaging seat along the circumferential direction, a engaging block is provided between the engaging seat and the seat connecting ring, which can engage with the first engaging groove and the second engaging groove at the same time, and a laterally extending pushing portion is provided on the engaging block. The unlocking portion is an inclined protrusion arranged on the backrest hinge seat along the circumferential direction and can push the pushing portion to disengage the engaging block from the first engaging groove when the backrest hinge seat is rotated and folded relative to the seat connecting ring. A third return spring is provided between the engaging block and the engaging seat, which can push the engaging block to slide and return to its original position.

[0013] An armrest connecting ring is provided between the seat connecting ring and the backrest hinge seat, an armrest connecting ring is provided with an armrest rod, and a third engaging groove that can engage with the engaging block is provided on the armrest connecting ring, and when the unlocking part pushes the pushing part to disengage the engaging block from the first engaging groove, the engaging block disengages from the third engaging groove.

[0014] The seat connecting ring is provided with an unlocking block which can push the operating block when the seat connecting ring rotates relative to the clamping seat and folds the seat rod relative to the rear legs.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. When the stroller of the utility model is folded, the locking device is first unlocked, and then the push rod is pulled backward, and the push rod and the second connecting piece rotate relative to the connecting seat around the second axis. At this time, the push rod rotates toward the rear leg, and the second connecting piece pulls the third connecting piece to rotate relative to the connecting seat through the first transmission piece during the rotation process. The third connecting piece pulls the first connecting piece to rotate relative to the connecting seat through the second transmission piece during the rotation process. The first connecting piece drives the front leg to rotate toward the rear leg, and finally the push rod and the front leg are close to the rear leg, so that the stroller is folded. The entire stroller has a simple structure and is very flexible to fold.

[0017] 2. The seat assembly is detachably connected to the connecting seat of the utility model through the seat connecting portion, and when the seat assembly is rotated and folded relative to the rear legs, the seat assembly can drive the operating block to unlock the locking device. Therefore, when the user needs to fold the child stroller, he only needs to fold the seat assembly to unlock the locking device, making the folding operation of the child stroller more convenient and quick.

Brief Description of the Drawings

[0018] Figure 1 It is a three-dimensional diagram of the utility model;

[0019] Figure 2 It is one of the three-dimensional diagrams of the components of the utility model;

[0020] Figure 3 This is the second perspective view of the components of the present utility model;

[0021] Figure 4 This is one of the exploded views of the components of the present utility model;

[0022] Figure 5 This is the second exploded view of the components of the present utility model;

[0023] Figure 6 This is the third exploded view of the components of the present utility model;

[0024] Figure 7This is the fourth exploded view of the components of the present utility model;

[0025] Figure 8 This is the fifth exploded view of the components of the present utility model;

[0026] Figure 9 It is a side view of the utility model during the folding process. [Specific implementation method]

[0027] The present invention will be further described below with reference to the accompanying drawings:

[0028] like Figures 1 to 6 as well as Figure 9 As shown, a child stroller can be moved from the unfolded position to the folded position after the locking device is unlocked, including a push rod 1 and a front leg 2 and a rear leg 3 connected to a wheel 100, the upper end of the rear leg 3 is fixedly provided with a connecting seat 4, the upper end of the front leg 2 is fixedly provided with a first connecting piece 51 which can rotate with the connecting seat 4 around a first axis A, the lower end of the push rod 1 is fixedly provided with a second connecting piece 52 which can rotate with the connecting seat 4 around a second axis B, and the connecting seat 4 is also rotatably connected to a third connecting piece 53 around a third axis C. A first transmission piece 54 is provided between the second connecting piece 52 and the third connecting piece 53, which is hinged to the two and can pull the third connecting piece 53 to rotate when the push rod 1 is rotated and folded relative to the rear leg 3; a second transmission piece 55 is provided between the third connecting piece 53 and the first connecting piece 51, which is hinged to the two and can pull the first connecting piece 51 to rotate relative to the connecting seat 4 when the first transmission piece 54 drives the third connecting piece 53 to rotate, so that the front leg 2 is folded towards the rear leg 3. When the stroller is folded, the locking device is first unlocked, and then the push rod 1 is pulled backward, and the push rod 1 and the second connecting piece 52 rotate relative to the connecting seat 4 around the second axis B. At this time, the push rod 1 rotates and approaches the rear leg 3. During the rotation process, the second connecting piece 52 pulls the third connecting piece 53 to rotate relative to the connecting seat 4 through the first transmission piece 54. During the rotation process, the third connecting piece 53 pulls the first connecting piece 51 to rotate relative to the connecting seat 4 through the second transmission piece 55. The first connecting piece 51 drives the front leg 2 to rotate and approach the rear leg 3. Finally, the push rod 1 and the front leg 2 are both close to the rear leg 3, and the child stroller is folded. The entire child stroller has a simple structure and is very flexible to fold.

[0029] like Figures 1 to 6As shown, the locking device includes a locking slot 61 at the lower end of the push rod 1. A locking block 62 is provided within the connecting base 4, which can slide within the locking slot 61 to engage or disengage the locking block 61. A driving rod 63 is also provided within the connecting base 4, movably connected to the locking block 62 and capable of driving the locking block 62 to disengage or engage with the locking slot 61. The driving rod 63 is provided with an operating block 64 exposed from the connecting base 4. A first return spring 65 is also provided within the connecting base 4 to push the driving rod 63 back into position. When the stroller is to be folded, the operating block 64 is moved downward, and the driving rod 63 moves downward, disengaging the locking block 62 from the locking slot 61. The push rod 1 can then rotate toward the rear leg 3, thereby driving the front leg 2 toward the rear leg 3 via the second transmission plate 55. The driving rod 63 and the locking block 62 can cooperate with each other via a circular shaft and a bar-shaped hole, so that the movement of the driving rod 63 drives the movement of the locking block 62.

[0030] like Figure 5 and Figure 6 As shown, a first latch 66 is provided at the outer edge of the second connecting piece 52. The driving rod 63 is provided with a protruding block 67 that can engage or disengage with the first latch 66 during sliding. One end of the first return spring 65 abuts against the block 67, while the other end abuts against the connecting base 4. When the stroller is deployed, the locking block 62 engages with the locking groove 61, and the block 67 engages with the first latch 66, achieving a double locking effect, making the deployed state of the stroller more stable and reliable.

[0031] like Figure 5 and Figure 6 As shown, the third connecting piece 53 is provided with a hook 68, and the first connecting piece 51 is provided with a second latch 69. When the stroller is in the unfolded state, the hook 68 engages with the second latch 69. When the push rod 1 is rotated and folded relative to the rear leg 3, the first transmission piece 54 pulls the third connecting piece 53 to rotate, causing the hook 68 to disengage from the second latch 69. When the stroller is in the unfolded state, the locking block 62 engages with the locking groove 61, the locking block 67 engages with the first latch 66, and the hook 68 engages with the second latch 69, achieving a triple lock, ensuring that the stroller is securely locked in the unfolded state, with minimal shaking and more stable pushing.

[0032] like Figure 1As shown, the connecting base 4 is provided with a seat connection portion 41, to which a foldable seat assembly 7 is detachably connected. When the seat assembly 7 is rotated and folded relative to the rear legs 3, the seat assembly 7 drives the operating block 64 to move, thereby unlocking the locking device. When the seat assembly 7 is rotated and folded relative to the rear legs 3, the seat assembly 7 drives the operating block 64 to unlock the locking device. Therefore, when the user needs to fold the stroller, they only need to fold the seat assembly 7 to unlock the locking device, making the folding operation of the stroller more convenient and quick. While the seat assembly can be omitted, a flexible seat pocket can be attached to the push rod 1 for the child to sit on. However, providing a foldable seat assembly ensures a more comfortable and safe ride for the child.

[0033] like Figure 1 、 Figure 7 and Figure 8 As shown, the seat assembly 7 includes a snap-in base 71 which is detachably engaged with the seat connecting portion 41, the snap-in base 71 is connected to a seat connecting ring 72 which can rotate relative to the snap-in base 71, the seat connecting ring 72 is provided with a seat rod 73, a first locking mechanism 74 for locking the seat connecting ring 72 and the snap-in base 71 is provided between the seat connecting ring 72 and the snap-in base 71, a backrest hinge base 75 is rotatably connected to the seat connecting ring 72, a second locking mechanism 76 for locking the backrest hinge base 75 and the snap-in base 71 or the seat connecting ring 72 is provided between the backrest hinge base 75 and the seat connecting ring 72, a backrest rod 77 is connected to the backrest hinge base 75, an unlocking switch 78 for driving the second locking mechanism 76 to unlock is provided at the upper end of the backrest rod 77, and an unlocking portion 79 is provided on the backrest hinge base 75 which can drive the first locking mechanism 74 to unlock when the backrest hinge base 75 is rotated and folded relative to the seat connecting ring 72. When the seat assembly 7 is folded, the second locking mechanism 76 is first unlocked by operating the unlocking switch 78, allowing the backrest rod 77 to rotate and fold relative to the seat rod 73. During this rotation, the unlocking portion 79 drives the first locking mechanism 74 to unlock. The seat rod 3 and the seat connecting ring 72 can then rotate relative to the engaging seat 71, and the seat rod 73 can then rotate and fold relative to the rear leg 3. During this process, the seat assembly 7 drives the operating block 64, which moves the driving rod 63, thereby disengaging the locking block 62 from the locking groove 61. The locking mechanism is now unlocked, and the push rod 1 can be rotated backward to fold the entire stroller. Therefore, the entire stroller can be unlocked by simply folding the seat assembly 7, making the folding operation simple and quick.

[0034] like Figure 7 and Figure 8As shown, the second locking mechanism 76 includes a plurality of first slots 761 provided on the clamping seat 71 along the circumferential direction, and a plurality of second slots 762 are provided on the backrest hinge seat 75 along the circumferential direction. A gear 763 that can move laterally and engage with the first slots 761 and the second slots 762 at the same time is provided in the space surrounded by the clamping seat 71 and the backrest hinge seat 75. A movable block 764 that can rotate and move laterally is provided between the gear 763 and the backrest hinge seat 75. There are multiple inclined grooves 765, and the backrest hinge seat 75 is provided with an inclined protrusion 766 that cooperates with the inclined groove 765 and can push the movable block 764 to move horizontally when the movable block 764 rotates. When the movable block 764 is pushed and moves horizontally, the movable block 764 pushes the gear 763 to disengage from the second slot 762. A second reset spring 767 that can push the gear 763 to move horizontally and reset is also provided between the gear 763 and the clamping seat 71. The movable block 764 is connected to the unlocking switch 78 through a pull rope 70. When the unlocking switch 78 is operated, the movable block 764 is pulled to rotate by the pull rope 70. During the rotation of the movable block 764, the inclined protrusion 766 on the backrest hinge seat 75 pushes the movable block 764 to move horizontally, and the movable block 764 pushes the gear 763 to disengage from the second slot 762. At this time, the backrest rod 77 can rotate relative to the clamping seat 71 and fold towards the seat rod 73. During this process, the unlocking part 79 drives the first locking mechanism 74 to unlock, and the seat rod 73 rotates toward the rear leg 3 and drives the locking device to unlock.

[0035] like Figure 7 and Figure 8 As shown, the first locking mechanism 74 includes a plurality of first engaging grooves 741 provided on the seat connecting ring 72 along the circumferential direction, a plurality of second engaging grooves 742 are provided on the engaging seat 71 along the circumferential direction, a engaging block 743 is provided between the engaging seat 71 and the seat connecting ring 72, which can simultaneously engage with the first engaging groove 741 and the second engaging groove 742, the engaging block 743 is provided with a laterally extending pushing portion 744, the unlocking portion 79 is an inclined protrusion provided on the backrest hinge seat 75 along the circumferential direction and can push the pushing portion 744 to disengage the engaging block 743 from the first engaging groove 741 when the backrest hinge seat 75 is rotated and folded relative to the seat connecting ring 72, and a third return spring 745 is provided between the engaging block 743 and the engaging seat 71, which can push the engaging block 743 to slide and return. When the backrest rod 77 is rotated and folded, the inclined protrusion on the backrest hinge seat 75 pushes the pushing portion 744 on the locking block 743, so that the locking block 743 disengages from the first locking groove 741 on the seat connecting ring 72. At this time, the seat connecting ring 72 can rotate relative to the locking seat 71, and the seat rod 73 can rotate closer to the rear leg 3, thereby realizing the folding of the seat assembly 7.

[0036] like Figure 7 and Figure 8 As shown, an armrest connecting ring 81 is provided between the seat connecting ring 72 and the backrest hinge seat 75. A handrail connecting ring 81 is provided with a handrail rod 82. A third engaging groove 746 is provided on the handrail connecting ring 81, which is engageable with the engaging block 743. When the unlocking portion 79 pushes the pushing portion 744 to disengage the engaging block 743 from the first engaging groove 741, the engaging block 743 disengages from the third engaging groove 746. The handrail rod 82 is provided for children to grasp for safety. When the seat assembly 7 is in the unfolded state, the locking block 743 is engaged with the first locking groove 741, the second locking groove 742 and the third locking groove 746 at the same time. When the backrest rod 77 is rotated and folded, the unlocking portion 79 pushes the locking block 743 to disengage from the first locking groove 741 and the third locking groove 746. At this time, the armrest rod 82 can also rotate relative to the seat connecting ring 72 and move closer to the seat rod 73, thereby realizing the folding of the armrest rod 82.

[0037] like Figure 8 As shown, the seat connecting ring 72 is equipped with an unlocking block 731 that pushes the operating block 64 when the seat connecting ring 72 rotates relative to the engaging base 71, causing the seat rod 73 to fold relative to the rear legs 3. When the seat rod 73 rotates and folds relative to the rear legs 3, the unlocking block 731 pushes the operating block 64, thereby unlocking the locking mechanism. Therefore, when folding the stroller, simply operate the unlocking switch 78 to rotate and fold the backrest rod 77, which in turn unlocks the locking mechanism. Then, rotate the push rod 1 to fold the entire stroller, making the folding operation extremely convenient and quick.

[0038] The embodiment is described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiment. Various changes can be made within the knowledge of ordinary technicians in the technical field without departing from the present invention.

Claims

1. A child stroller capable of moving from an unfolded position to a folded position after a locking device is unlocked, characterized in that: The invention comprises a push rod (1), a front leg (2) connected to a wheel (100), and a rear leg (3), wherein the upper end of the rear leg (3) is fixed with a connecting seat (4), the upper end of the front leg (2) is fixed with a first connecting piece (51) which is rotatable with the connecting seat (4) around a first axis (A), the lower end of the push rod (1) is fixed with a second connecting piece (52) which is rotatable with the connecting seat (4) around a second axis (B), and the connecting seat (4) is also rotatably connected with a third connecting piece (53) around a third axis (C), and the second A first transmission piece (54) is provided between the connecting piece (52) and the third connecting piece (53), which is hinged to the two and can pull the third connecting piece (53) to rotate when the push rod (1) rotates and folds relative to the rear leg (3). A second transmission piece (55) is provided between the third connecting piece (53) and the first connecting piece (51), which is hinged to the two and can pull the first connecting piece (51) to rotate relative to the connecting seat (4) when the first transmission piece (54) drives the third connecting piece (53) to rotate, so that the front leg (2) is moved closer to the rear leg (3) and folded.

2. The stroller according to claim 1, characterized in that: The locking device includes a locking groove (61) provided at the lower end of the push rod (1), a locking block (62) that can slide therein and engage or disengage with the locking groove (61) is provided in the connecting seat (4), and a driving rod (63) that is movably connected to the locking block (62) and can drive the locking block (62) to disengage or engage with the locking groove (61) is provided in the connecting seat (4), and an operating block (64) exposed from the connecting seat (4) is provided on the driving rod (63), and a first reset spring (65) that pushes the driving rod (63) to slide and reset is also provided in the connecting seat (4).

3. The stroller according to claim 2, characterized in that: A first bayonet (66) is provided at the outer edge of the second connecting piece (52), and a protruding block (67) is provided on the driving rod (63) and can be engaged with or disengaged from the first bayonet (66) when sliding. One end of the first return spring (65) abuts against the block (67), and the other end abuts against the connecting seat (4).

4. The stroller according to claim 2, characterized in that: The third connecting piece (53) is provided with a hook (68), and the first connecting piece (51) is provided with a second bayonet (69). When the stroller is in the unfolded state, the hook (68) is engaged with the second bayonet (69); when the push rod (1) is rotated and folded relative to the rear leg (3), the first transmission piece (54) pulls the third connecting piece (53) to rotate, so that the hook (68) is disengaged from the second bayonet (69).

5. The stroller according to claim 2, characterized in that: The connecting seat (4) is provided with a seat connecting portion (41), and a foldable seat assembly (7) is detachably connected to the seat connecting portion (41). When the seat assembly (7) is rotated and folded relative to the rear legs (3), the seat assembly (7) drives the operating block (64) to move, thereby unlocking the locking device.

6. The stroller according to claim 5, characterized in that: The seat assembly (7) includes a snap-fit ​​seat (71) that is detachably engaged with the seat connecting portion (41), a seat connecting ring (72) that is rotatable relative to the snap-fit ​​seat (71), a seat connecting ring (72) that is provided with a seat rod (73), a first locking mechanism (74) for locking the seat connecting ring (72) and the snap-fit ​​seat (71), a backrest hinge seat (75) that is rotatably connected to the seat connecting ring (72), and a backrest hinge seat (75) that is rotatable relative to the seat connecting ring (72). A second locking mechanism (76) for locking the seat (75) and the snap-fit ​​seat (71) or the seat connecting ring (72) is provided between the seat (75) and the snap-fit ​​seat (71) or the seat connecting ring (72). A backrest rod (77) is connected to the backrest hinge seat (75). An unlocking switch (78) for driving the second locking mechanism (76) to unlock is provided at the upper end of the backrest rod (77). In addition, an unlocking portion (79) is provided on the backrest hinge seat (75) for driving the first locking mechanism (74) to unlock when the backrest hinge seat (75) is rotated and folded relative to the seat connecting ring (72).

7. The stroller according to claim 6, characterized in that: The second locking mechanism (76) includes a plurality of first slots (761) provided on the clamping seat (71) along the circumferential direction, a plurality of second slots (762) provided on the backrest hinge seat (75) along the circumferential direction, a gear (763) capable of moving laterally and engaging with the first slots (761) and the second slots (762) at the same time is provided in the space enclosed by the clamping seat (71) and the backrest hinge seat (75), a movable block (764) capable of rotating and moving laterally is provided between the gear (763) and the backrest hinge seat (75), and a plurality of second slots (762) provided on the movable block (764) along the circumferential direction. An inclined groove (765) is provided on the backrest hinge seat (75), and an inclined protrusion (766) is provided on the backrest hinge seat (75) and is matched with the inclined groove (765) and can push the movable block (764) to move horizontally when the movable block (764) rotates. When the movable block (764) is pushed to move horizontally, the movable block (764) pushes the gear (763) to disengage from the second clamping groove (762). A second reset spring (767) is further provided between the gear (763) and the clamping seat (71) and can push the gear (763) to move horizontally and reset. The movable block (764) is connected to the unlocking switch (78) through a pull rope (70).

8. The stroller according to claim 7, characterized in that: The first locking mechanism (74) comprises a plurality of first engaging grooves (741) provided on the seat connecting ring (72) along the circumferential direction, a plurality of second engaging grooves (742) are provided on the engaging seat (71) along the circumferential direction, a engaging block (743) capable of engaging with the first engaging grooves (741) and the second engaging grooves (742) at the same time is provided between the engaging seat (71) and the seat connecting ring (72), and a transversely extending engaging block (743) is provided on the engaging block (743). The unlocking portion (79) is an oblique protrusion provided on the backrest hinge seat (75) along the circumferential direction and capable of pushing the pushing portion (744) to disengage the engaging block (743) from the first engaging groove (741) when the backrest hinge seat (75) is rotated and folded relative to the seat connecting ring (72). A third return spring (745) is provided between the engaging block (743) and the engaging seat (71) to push the engaging block (743) to slide and return.

9. The stroller according to claim 8, characterized in that: An armrest connecting ring (81) is provided between the seat connecting ring (72) and the backrest hinge seat (75), an armrest rod (82) is provided on the armrest connecting ring (81), and a third engaging groove (746) capable of engaging with the engaging block (743) is provided on the armrest connecting ring (81), and when the unlocking portion (79) pushes the pushing portion (744) to disengage the engaging block (743) from the first engaging groove (741), the engaging block (743) disengages from the third engaging groove (746).

10. The stroller according to claim 7, characterized in that: The seat connecting ring (72) is provided with an unlocking block (731) which can push the operating block (64) when the seat connecting ring (72) rotates relative to the clamping seat (71) and folds the seat rod (73) relative to the rear leg (3).

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