A child's pushchair

Abstract

This invention discloses a stroller with a foldable bottom support frame. The bottom support frame includes a front leg with front wheels and a rear leg with rear wheels. The front leg is rotatably connected to the rear leg. A connecting seat is rotatably connected to the upper part of the bottom support frame, and a push rod assembly is rotatably connected to the connecting seat. A foldable seat assembly is also connected to the connecting seat, which rotates relative to the bottom support frame to switch between forward and backward modes. The seat assembly includes a seat, armrests, and a backrest. A fourth locking assembly is provided between the backrest and the seat, and a backrest unlocking member is provided on the backrest for releasing the fourth locking assembly. A fifth locking assembly is provided between the armrests and the seat, and a sixth locking assembly is provided between the seat and the connecting seat. The purpose of this invention is to overcome the shortcomings of the prior art and provide a stroller that is easy to unlock and simple to fold.

Description

[0001] The present application relates to the field of children's strollers, in particular to a children's stroller.

[0002] Children's strollers have become an indispensable product in the growth process of infants. Many children's strollers on the market currently include a foldable children's stroller frame and a seat assembly connected to the children's stroller frame.

[0003] The children's stroller of the present stage is usually operated to unlock the backrest part of the seat assembly during folding, the backrest part is rotated to the seat part direction to link the seat part to unlock, then the seat frame is rotated to the front leg direction to close, and then the seat frame is rotated to the rear leg direction to close to link the children's stroller frame to unlock so that the children's stroller frame is folded; however, the center of gravity of the children's stroller is basically located between the front leg and the rear leg, when folding the stroller, if the seat assembly is folded to the front leg and the push rod is closed to the rear leg, since the weight of the stroller is mostly concentrated on the front leg or near the front leg, the front leg and the seat assembly cannot be automatically rotated to fold relative to the rear leg at this time, at this time, an adult needs to manually operate to complete the folding of the children's stroller, and the folding operation is not very convenient.

[0004] Therefore, the present application is proposed in view of the above problems.

[0005] The present application aims to overcome the shortcomings of the prior art and provide a children's stroller which is convenient to unlock and simple to fold.

[0006] The present application is a children's stroller having a foldable bottom support frame 1, the bottom support frame 1 includes a front leg 11 having a front wheel 111 and a rear leg 12 having a rear wheel 121, the front leg 11 is rotatably connected with the rear leg 12, a connecting seat 2 is rotatably connected to the upper part of the bottom support frame 1, and a push rod assembly 3 is rotatably connected to the connecting seat 2.

[0007] A first locking assembly 51 capable of locking the front leg 11 and the rear leg 12 relative to each other is arranged between the upper ends of the front leg 11 and the rear leg 12, a second locking assembly 52 capable of locking the push rod assembly 3 and the connecting seat 2 relative to each other is arranged between the push rod assembly 3 and the connecting seat 2, and a first unlocking assembly 53 for linking the corresponding unlocking of the first locking assembly 51 and the second locking assembly 52 is arranged on the connecting seat 2.

[0008] ​​​The connecting seat 2 is further connected with a foldable seat assembly 4 capable of following the connecting seat 2 to rotate relative to the bottom support frame 1 to switch between the forward mode and the backward mode, the seat assembly 4 comprises a seat part 41, an armrest part 42 and a backrest part 43, a fourth locking assembly 56 is arranged between the backrest part 43 and the seat part 41 for locking the backrest part 43 relative to the seat part 41, the backrest part 43 is provided with a backrest unlocking piece 564 for releasing the fourth locking assembly 56, a fifth locking assembly 57 is arranged between the armrest part 42 and the seat part 41 for locking the armrest part 42 relative to the seat part 41, and a sixth locking assembly 58 is arranged between the seat part 41 and the connecting seat 2 for locking the seat part 41 relative to the connecting seat 2.

[0009] When the seat assembly 4 is in the backward mode, the fourth locking assembly 56 is first released to make the backrest part 43 close to the seat part 41 and fold to a preset angle, the fifth locking assembly 57 is then released in linkage to make the armrest part 42 rotate and close to the seat part 41 and fold to a preset angle, and the sixth locking assembly 58 is then released in linkage to make the seat part 41 rotate and fold to the rear leg 12 relative to the connecting seat 2; and when the seat part 41 rotates and folds to the rear leg 12 relative to the connecting seat 2, the seat part 41 links the first unlocking assembly 53 to make the first locking assembly 51 and the second locking assembly 52 correspondingly unlocked, and the push rod assembly 3 rotates relative to the connecting seat 2 to close to the rear leg 12, and the front leg 11 is then linked to make the push rod assembly 3 and the front leg 11 close to the rear leg 12 when the push rod assembly 3 rotates to a preset angle.

[0010] The push rod assembly 3 is provided with a linkage assembly 6 capable of making the push rod assembly 3 and the front leg 11 simultaneously close to the rear leg 12 when the push rod assembly 3 rotates and folds to the rear leg 12 relative to the connecting seat 2 to a preset angle.

[0011] The push rod assembly 3 is provided with a second unlocking assembly 54 capable of unlocking the second locking assembly 52, the bottom support frame 1 and the connecting seat 2 are provided with a third locking assembly 55 capable of locking relative to each other to prevent the connecting seat 2 and the seat assembly 4 from rotating and switching direction relative to the bottom support frame 1, and when the second locking assembly 52 is unlocked, the push rod assembly 3 can rotate upward relative to the connecting seat 2 to a preset angle to unlock the third locking assembly 55.

[0012] The rear leg 12 comprises a mounting base 122 and a rear leg rod 123 connected to the mounting base 122, the rear wheel 121 is connected to the rear leg rod 123, the front leg 11 is rotatably connected to the mounting base 122, the connecting base 2 is rotatably connected to the mounting base 122, the linkage assembly 6 comprises a sliding piece 61 slidably connected in the mounting base 122, the rear end of the sliding piece 61 is provided with a driven gear portion 611, the front end of the sliding piece 61 is pivotally connected with the front leg 11 through a linkage piece 62 which can rotate relative to the two, the push rod assembly 3 is connected with a rotating piece 63 which is synchronously connected in the connecting base 2, the rotating piece 63 is provided with a driving gear portion 64 which can mesh with the driven gear portion 611 when the rotating piece 63 rotates to a preset angle to drive the push rod assembly 3 and the front leg 11 to move towards the rear leg 12.

[0013] The push rod assembly 3 comprises a rotating base 31 rotatably connected to the connecting base 2, a rotating rod 32 synchronously connected between the two rotating bases 31, a supporting rod 33 connected to the rotating base 31, a hand push rod 34 connected to the supporting rod 33, the second locking assembly 52 comprises a left connecting shell 521 and a right connecting shell 522 respectively provided on the connecting base 2, the left connecting shell 521 and the right connecting shell 522 are both provided with a space for accommodating the rotating base 31 and a spline groove 523, the space is movably provided with a spline 524 for clamping the spline groove 523, the spline 524 and the rotating base 31 are further provided with a spline reset member 525, the first unlocking assembly 53 comprises a sliding block 531 slidably connected in the connecting base 2, the side surface of the sliding block 531 is provided with a protruding block 5311, the side surface of the spline 524 is correspondingly provided with a groove 5241 matched with the protruding block 5311, the protruding block 5311 is provided with a first inclined sliding surface 5312, the groove 5241 is provided with a second inclined sliding surface 5242 matched with the first inclined sliding surface 5312 to make the protruding block 5311 push the spline 524 to correspondingly disengage from the spline groove 523 on the left connecting shell 521 and the right connecting shell 522, the seat part 41 is provided with a pushing surface 532 which can push the sliding block 531 to slide when the seat part 41 rotates relative to the connecting base 2, the sliding block 531 and the connecting base 2 are provided with a pushing block elastic member 533 for resetting the sliding block 531.

[0014] The rear leg 12 comprises a mounting base 122 and a rear leg rod 123 connected to the mounting base 122, the upper portion of the front leg 11 is rotatably connected to the mounting base 122, the connecting base 2 is rotatably connected to the mounting base 122, the first locking assembly 51 comprises a locking pin 511 arranged on the upper portion of the front leg 11 and a clamping hook 512 rotatably arranged on the mounting base 122 for clamping locking with the locking pin 511, the clamping hook 512 and the mounting base 122 are provided with a clamping hook elastic element 513 capable of pushing the clamping hook 512 to reset, so that the clamping hook 512 is kept clamped on the locking pin 511, the first unlocking assembly 53 further comprises a pushing block 534 slidingly connected in the mounting base 122 and pushing the clamping hook 512 to rotate to disengage from the locking pin 511 when the sliding block 531 slides downward.

[0015] The rear leg 12 comprises a mounting base 122 and a rear leg rod 123 connected to the mounting base 122, the upper portion of the front leg 11 is rotatably connected to the mounting base 122, the connecting base 2 is rotatably connected to the mounting base 122, the push rod assembly 3 comprises a rotating rod 32 which is relatively rotatably and transversely through a rotating shaft sleeve 555, the third locking assembly 55 comprises a sleeve 554, a rotating shaft sleeve 555 and a locking piece 553, the sleeve 554 is relatively fixedly arranged on the mounting base 122, the rotating shaft sleeve 555 is rotatably connected with the sleeve 554, the connecting base 2 is rotatably connected to the mounting base 122 through the rotating shaft sleeve 555, the front side of the sleeve 554 is provided with a first clamping slot 551 in the axial direction, the locking piece 553 is arranged in the rotating shaft sleeve 555 and is connected with the rotating rod 32 in motion, the front and rear sides of the rotating shaft sleeve 555 are provided with avoiding through grooves 556 in the axial direction, the rear side of the sleeve 554 forms a limiting stop wall 557 so that the locking piece 553 can only be rotated and inclined to the rear leg 12; when the push rod assembly 3 is turned up to a predetermined angle, the locking piece 553 rotates with the rotating rod 32 to disengage from the first clamping slot 551, the connecting base 2 and the mounting base 122 are released, and the seat assembly 4 can be rotated and reversed with the connecting base 2.

[0016] The rear side of the sleeve 554 is provided with a second clamping slot 552 in the axial direction, the depth of the second clamping slot 552 is less than the depth of the first clamping slot 551, a limiting stop wall is formed at the bottom of the second clamping slot 552 to limit the lower portion of the locking piece 553 to extend out of the rear side of the sleeve 554, thereby making the locking piece 553 only be able to rotate and incline to the rear leg 12.

[0017] The second unlocking assembly 54 comprises a first unlocking piece 541 arranged on the hand push rod 34, and further comprises a pull rod 542 connected to the spline 524 and used to drive the spline 524 to be separated from the spline groove 523 on the left connecting shell 521 and the right connecting shell 522, and the end of the pull rod 542 is connected with a pulling piece 543, and the pushing rod unlocking linkage 544 is arranged between the pulling piece 543 and the first unlocking piece 541.

[0018] The fourth locking assembly 56 comprises an adjusting clamping position 561 arranged on the seat part 41, and the backrest part 43 is arranged with a clamping piece 562 which can be movably inserted into the adjusting clamping position 561, and the backrest part 43 is arranged with a backrest adjusting locking elastic piece 563 which can elastically push the clamping piece 562 to be clamped into the corresponding adjusting clamping position 561, and the backrest unlocking linkage 565 which can drive the clamping piece 562 to slide is arranged between the backrest unlocking piece 564 and the clamping piece 562.

[0019] The fifth locking assembly 57 comprises an armrest locking hole 571 arranged on the armrest part 42, and the seat part 41 is arranged with an armrest locking piece 572 which can be movably inserted into the armrest locking hole 571, and the armrest locking piece 572 is arranged with a top abutting part 573 which can be extended into the backrest part 43, and the backrest part 43 is further arranged with an armrest linkage unlocking part 574, when the backrest part 43 is rotated to a preset angle relative to the seat part 41, the armrest linkage unlocking part 574 pushes the top abutting part 573 so that the armrest locking piece 572 is separated from the armrest locking hole 571 to be released, and the armrest locking elastic piece 575 which can make the armrest locking piece 572 be clamped into the armrest locking hole 571 is arranged between the armrest locking piece 572 and the seat part 41.

[0020] The sixth locking assembly 58 comprises a seat locking hole 581 arranged on the connecting base 2, and the bottom of the seat part 41 is arranged with a seat lock pin 582 which can be movably inserted into the seat locking hole 581, and the seat lock pin 582 and the armrest locking piece 572 are arranged with the seat unlocking linkage 583 which can drive the seat lock pin 582 to be moved and separated from the seat locking hole 581 when the armrest locking piece 572 is moved and separated from the armrest locking hole 571, and the seat locking elastic piece 584 which can elastically push the seat lock pin 582 to be kept extended is arranged between the seat lock pin 582 and the seat part 41.

[0021] The rear leg 12 comprises a mounting base 122 and a rear leg rod 123 connected to the mounting base 122, the front leg 11 is rotatably connected to the mounting base 122, and the connecting base 2 is rotatably connected to the mounting base 122, and the torsional spring 7 which can help the front leg 11 to be automatically close to the rear leg 12 after being released is arranged between the front leg 11 and the mounting base 122.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1、When the child stroller needs to be folded, the seat assembly is adjusted to the rearward mode, then the fourth locking assembly is unlocked by the backrest unlocking member, the backrest part is pushed to rotate and close to the seat part, in the process of rotating and closing to the seat part, the backrest part unlocks the fifth locking assembly, at this time the armrest part rotates and closes to the seat part under the weight, in the process of rotating and closing to the seat part, the armrest part unlocks the sixth locking assembly, at this time the seat part can rotate relative to the connecting seat and rotate and close to the rear leg, and when the seat assembly rotates and closes to the rear leg, the seat part pushes the unlocking assembly to unlock the second locking assembly and the first locking assembly, at this time the push rod assembly rotates relative to the connecting seat and closes to the rear leg, at this time the front leg also rotates and closes to the rear leg, the present application only needs to adjust the seat assembly to the rearward mode and push the backrest part to rotate and fold when folding, the whole folding and unlocking process is very smooth and the operation is very convenient.

[0024] 2、The driving assembly makes the push rod assembly drive the front leg to rotate and close to the rear leg when the push rod assembly rotates a certain angle, at this time the whole child stroller does not need to be held when folding, the rear leg and the push rod assembly can make the child stroller stand, and adults only need to operate to push the backrest part to rotate and close to the seat part to complete the folding of the whole vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the perspective view of the child stroller of the present application;

[0026] Figure 2 is the side view of the child stroller of the present application;

[0027] Figure 3 is the state diagram of the child stroller of the present application when the push rod is in the vertical position;

[0028] Figure 4 is the state diagram of the child stroller of the present application when the seat assembly, the mounting seat and the push rod assembly are reversed;

[0029] Figure 5 is the perspective view of the child stroller of the present application when the seat assembly, the mounting seat and the push rod assembly are reversed;

[0030] Figure 6 is the state diagram of the child stroller of the present application when the seat assembly, the mounting seat and the push rod assembly are reversed;

[0031] Figure 7 is the perspective view of the driving assembly in the child stroller of the present application;

[0032] Figure 8 is the sectional view of the third locking assembly in the child stroller of the present application in the original state;

[0033] Figure 9is a sectional view of the third locking assembly when the push bar assembly is in the vertical position in the stroller of the present invention;

[0034] Figure 10 is a sectional view of the third locking assembly when the push bar assembly is in the vertical position and the stroller seat assembly, mounting base and push bar assembly are reversed in the stroller of the present invention;

[0035] Figure 11 is a sectional view of the third locking assembly when the push bar assembly is in the vertical position and the stroller seat assembly, mounting base and push bar assembly are reversed in the stroller of the present invention;

[0036] Figure 12 is one of the exploded views of the second locking assembly and the second unlocking assembly in the stroller of the present invention;

[0037] Figure 13 is the second exploded view of the second locking assembly and the second unlocking assembly in the stroller of the present invention;

[0038] Figure 14 is the exploded view of the second locking assembly, the second unlocking assembly and the first locking assembly in the stroller of the present invention;

[0039] Figure 15 is the perspective view of the spline and the sliding block in the stroller of the present invention;

[0040] Figure 16 is one of the exploded views of the spline and the sliding block in the stroller of the present invention;

[0041] Figure 17 is the second exploded view of the spline and the sliding block in the stroller of the present invention;

[0042] Figure 18 is the perspective view of the drive assembly in the stroller of the present invention;

[0043] Figure 19 is the state view of the drive assembly when the front leg is folded in the stroller of the present invention;

[0044] Figure 20 is one of the exploded views of the fourth locking assembly, the fifth locking assembly and the sixth locking assembly in the stroller of the present invention;

[0045] Figure 21 is the second exploded view of the fourth locking assembly, the fifth locking assembly and the sixth locking assembly in the stroller of the present invention;

[0046] Figure 22 is the third exploded view of the fourth locking assembly, the fifth locking assembly and the sixth locking assembly in the stroller of the present invention;

[0047] Figure 23 is the exploded view of the seventh locking structure in the stroller of the present invention.

Detailed Implementation Methods

[0048] The present invention will now be further described with reference to the accompanying drawings:

[0049] like Figures 1 to 23 As shown, the present invention provides a child stroller with a retractable bottom support frame 1. The bottom support frame 1 includes a front leg 11 with a front wheel 111 and a rear leg 12 with a rear wheel 121. The front leg 11 is rotatably connected to the rear leg 12 about a first axis A. A connecting seat 2 is rotatably connected to the upper part of the bottom support frame 1. A push rod assembly 3 is rotatably connected to the connecting seat 2 about a second axis B.

[0050] A first locking component 51 capable of locking the front leg 11 and the rear leg 12 relative to each other is provided between the upper ends of the two legs. A second locking component 52 capable of locking the push rod component 3 and the connecting seat 2 relative to each other is provided between the two legs. A first unlocking component 53 for releasing the first locking component 51 and the second locking component 52 in conjunction with each other is provided on the connecting seat 2.

[0051] The connecting seat 2 is also connected to a foldable seat assembly 4 that can rotate with the connecting seat 2 relative to the bottom support frame 1 to switch between forward and backward modes. The seat assembly 4 includes a seat portion 41, an armrest portion 42, and a backrest 43 rotatably connected to the connecting seat 2 about a third axis C. A fourth locking component 56 for locking the backrest 43 relative to the seat portion 41 is provided between the backrest 43 and the seat portion 41. A backrest unlocking component 564 for releasing the fourth locking component 56 is provided on the backrest 43. A fifth locking component 57 for locking the armrest portion 42 relative to the seat portion 41 is provided between the armrest portion 42 and the seat portion 41. A sixth locking component 58 for locking the seat portion 41 relative to the connecting seat 2 is provided between the seat portion 41 and the connecting seat 2.

[0052] When the seat assembly 4 is in the rearward mode, the fourth locking assembly 56 is first unlocked to allow the backrest 43 to rotate towards the seat 41 and fold to a preset angle, and the fifth locking assembly 57 is then unlocked to allow the armrest 42 to rotate towards the seat 41 and fold to a preset angle, and the sixth locking assembly 58 is then unlocked to allow the seat 41 to rotate towards the rear leg 12 relative to the connecting base 2. When the seat 41 rotates towards the rear leg 12 relative to the connecting base 2, the seat 41 unlocks the first unlocking assembly 53, which in turn unlocks the first locking assembly 51 and the second locking assembly 52. Accordingly, the push rod assembly 3 rotates relative to the connecting base 2 and folds towards the rear leg 12, and when the push rod assembly 3 rotates to a preset angle, the front leg 11 is then folded towards the rear leg 12. Only when the seat assembly 4 is folded towards the rear, the seat assembly 4 can be folded relative to the connecting base 2.

[0053] When the stroller needs to be folded, the seat assembly 4 is adjusted to the rearward mode, and the fourth locking assembly 56 is then unlocked by the backrest unlocking piece 564, and the backrest 43 is pushed to rotate towards the seat 41. During the rotation of the backrest 43 towards the seat 41, the backrest 43 unlocks the fifth locking assembly 57, and at this time the armrest 42 rotates towards the seat 41 under its own weight. During the rotation of the armrest 42 towards the seat 41, the armrest 42 unlocks the sixth locking assembly 58, and at this time the seat 41 can rotate relative to the connecting base 2 and rotate towards the rear leg 12. When the seat assembly 4 rotates towards the rear leg 12, the seat 41 pushes the unlocking assembly 53 to unlock the second locking assembly 52 and the first locking assembly 51. At this time, the push rod assembly 3 rotates relative to the connecting base 2 and folds towards the rear leg 12, and at this time the front leg 11 also rotates towards the rear leg 12. The present application only needs to adjust the seat assembly 4 to the rearward mode and push the backrest 43 to fold when folding, and the entire folding and unlocking process is very smooth and the operation is very convenient. During the folding process of the present application, when the seat assembly 4 is folded towards the rear leg 12, the push rod assembly 3 is also folded towards the rear leg 12 at the same time. At this time, the weight of the entire stroller is close to the rear leg 12, and the rear leg 12 is used as a fulcrum. When the push rod assembly 3 and the rear leg 12 are in contact with the ground at the same time, the entire stroller can stand by itself when folding through the push rod assembly 3 and the rear leg 12, and the front leg 11 can rotate relative to the rear leg 12 and automatically fold towards the rear leg 12. The present application can complete automatic folding of the stroller, and the entire folding operation is very simple.

[0054] The linkage assembly 6 is arranged between the push rod assembly 3 and the front leg 11, and is capable of synchronously folding the push rod assembly 3 and the front leg 11 to the rear leg 12 when the push rod assembly 3 is rotated to a preset angle relative to the connecting base 2. The linkage assembly 6 is capable of simultaneously rotating the front leg 11 and the push rod assembly 3 relative to the rear leg 12 when the push rod assembly 3 is rotated to a certain angle. At this time, the whole stroller can be folded without holding the stroller, and the rear leg 12 and the push rod assembly 3 can make the stroller stand, and the adult only needs to operate the backrest 43 to rotate and fold the seat 41 to complete the folding of the whole stroller.

[0055] The push rod assembly 3 is provided with a second unlocking assembly 54 capable of unlocking the second locking assembly 52, and the third locking assembly 55 capable of relative locking of the connecting base 2 and the seat assembly 4 is arranged between the bottom support frame 1 and the connecting base 2 to prevent the connecting base 2 and the seat assembly 4 from rotating relative to the bottom support frame 1. When the second locking assembly 52 is unlocked, the push rod assembly 3 can be rotated upward relative to the connecting base 2 to a preset angle to unlock the third locking assembly 55. The present application can change the front and rear directions of the seat assembly 4, and when the second unlocking assembly 54 unlocks the second locking assembly 52, the push rod assembly 3 can be rotated relative to the connecting base 2. At this time, the push rod assembly 3 can be moved from the unfolded position to the vertical position, and the third locking assembly 55 is unlocked during the movement of the push rod assembly 3 from the unfolded position to the vertical position. At this time, the connecting base 2 and the seat assembly 4 can be rotated relative to the bottom support frame 1.

[0056] The rear leg 12 comprises a mounting base 122 and a rear leg rod 123 connected to the mounting base 122, and the rear wheel 121 is connected to the rear leg rod 123. The front leg 11 is rotatably connected to the mounting base 122 about the first axis A, and the connecting base 2 is rotatably connected to the mounting base 122. The mounting base 122 is arranged to connect the connecting base 2 and the front leg 11.

[0057] The linkage assembly 6 comprises a sliding piece 61 slidably connected to the mounting base 122 and rotatably connected to the upper end of the front leg 11, and a plurality of driven tooth portions 611 are arranged on the rear end of the sliding piece 61. A linkage piece 62 capable of rotating relative to the sliding piece 61 and the front leg 11 is connected between the front end of the sliding piece 61 and the upper end of the front leg 11. A plurality of rotating pieces 63 capable of rotating relative to the connecting base 2 are connected to the push rod assembly 3 in the connecting base 2. A plurality of driving tooth portions 64 capable of meshing and transmitting with the driven tooth portions 611 when the rotating pieces 63 are rotated to a preset position are arranged on the rotating pieces 63. When the push rod assembly 3 is unlocked and rotated to a preset position relative to the mounting base 122 by its own gravity, the driving tooth portions 64 on the rotating pieces 63 mesh with the driven tooth portions 611 on the sliding piece 61. At this time, the sliding piece 61 and the linkage piece 62 are pushed forward, the linkage piece 62 rotates relative to the front end of the sliding piece 61 and the upper end of the front leg 11, and the front leg 11 and the push rod assembly 3 are simultaneously rotated to the rear leg 12.

[0058] The push rod assembly 3 includes a rotating seat 31 rotatably connected to the connecting seat 2. A rotating rod 32, which passes laterally through the connecting seat 2, is connected to the rotating seat 31. A support rod 33 is also connected to the rotating seat 31. A push rod 34, which can slide and extend relative to the support rod 33, is connected to the support rod 33. The second locking assembly 52 includes a left connecting shell 521 disposed on the connecting seat 2 and a right connecting shell 522 disposed on the rotating seat 31. A sealed space is formed between the left connecting shell 521 and the right connecting shell 522. A spline 524, which can move laterally within the sealed space and can simultaneously engage with the spline grooves 523 on the left connecting shell 521 and the right connecting shell 522, is provided between the spline 524 and the right connecting shell 522. The key reset component 525, the first unlocking component 53 includes a sliding block 531 slidably connected in the connecting seat 2, the sliding block 531 is provided with a protruding protrusion 5311, the spline 524 is provided with a groove 5241 that can accommodate it, the protrusion 5311 is provided with a first inclined sliding surface 5312, the groove 5241 is provided with a second inclined sliding surface 5242 that can cooperate with the first inclined sliding surface 5312 to push the spline 524 out of the spline groove 523 on the left connecting shell 521, the seat part 41 is provided with a pushing surface 532 that can push the sliding block 531 to slide when it rotates relative to the connecting seat 2, and a pushing block elastic element 533 that can push the sliding block 531 to reset is provided between the sliding block 531 and the connecting seat 2. When the seat part 41 rotates relative to the connecting seat 2, the pushing surface 532 on the seat part 41 presses against the sliding block 531, and the first inclined sliding surface 5312 on the protrusion 5311 of the sliding block 531 pushes against the second inclined sliding surface 5242 on the spline groove 523, thereby pushing the spline 524 from the left connecting shell 521 into the right connecting shell 522. At this time, the second locking component 52 is unlocked, and the push rod component 3 can rotate relative to the connecting seat 2 and rotate towards the rear leg 12.

[0059] The first locking assembly 51 comprises a locking pin 511 arranged on the upper portion of the front leg 11 and a clamping hook 512 rotatably arranged on the mounting base 122 for clamping cooperation with the locking pin 511, and a clamping hook elastic member 513 arranged between the clamping hook 512 and the mounting base 122 for pushing the clamping hook 512 back to position so that the clamping hook 512 is clamped on the locking pin 511. The first unlocking assembly 53 further comprises a pushing block 534 slidingly connected in the mounting base 122 and pushing the clamping hook 512 to rotate to disengage from the locking pin 511 when the sliding block 531 slides downward. When the sliding block 531 is pushed downward relative to the connecting base 2 by the pushing surface 532, the sliding block 531 pushes the pushing block 534 to move downward, and in the process of moving downward, the pushing block 534 pushes the rear end of the clamping hook 512, and the front end of the clamping hook 512 rotates relative to the mounting base 122. At this time, the clamping hook 512 is separated from the locking pin 511 on the front leg 11, and the top end of the front leg 11 is pushed by the sliding member 61 to rotate the front leg 11 relative to the mounting base 122 around the first axis A and move towards the rear leg 123.

[0060] The third locking assembly 55 comprises a sleeve 554, a rotating shaft sleeve 555 and a locking member 553. The sleeve 554 is arranged on the mounting base 122 in a relative fixed manner, the rotating shaft sleeve 555 is rotatably connected with the sleeve 554, and the connecting base 2 is rotatably connected with the mounting base 122 through the rotating shaft sleeve 555. The front side of the sleeve 554 is axially provided with a first clamping groove 551, the locking member 553 is arranged in the rotating shaft sleeve 555 and connected with the rotating rod 32 in a same motion manner, the front and rear sides of the rotating shaft sleeve 555 are axially provided with avoiding through grooves 556, and the rear side of the sleeve 554 forms a limiting stop wall 557 so that the locking member 553 can only be rotated and inclined towards the rear leg 12. When the push rod assembly 3 is turned upward to a preset angle, the locking member 553 is rotated with the rotating rod 32 to disengage from the first clamping groove 551, the connecting base 2 is released from the mounting base 122, and the seat assembly 4 can be rotated and reversed with the connecting base 2.

[0061] The rear side of the sleeve 554 is axially provided with a second clamping groove 552, the depth of the second clamping groove 552 is smaller than that of the first clamping groove 551, and the limiting stop wall 557 is formed at the bottom of the second clamping groove 552 to limit the lower portion of the locking member 553 to extend out of the rear side of the sleeve 554, so that the locking member 553 can only be rotated and inclined towards the rear leg 12.

[0062] The locking piece 553 includes a locking piece 5531 capable of being clamped into the first clamping slot 551, and the locking piece 5531 is connected with a clamping protrusion 5532 capable of being clamped into the second clamping slot 552, the depth of the second clamping slot 552 is less than the depth of the first clamping slot 551, so that the bottom of the locking piece 553 abuts against the limiting stop wall 557 on the mounting seat 122 and on the same side of the second clamping slot 552 when the push rod assembly 3 is rotated from the unfolded position to the vertical position. When the push rod assembly 4 is in the unfolded state, the locking piece 5531 and the clamping protrusion 5532 are clamped in the first clamping slot 551 and the second clamping slot 552 respectively, at this time the connecting seat 2 cannot be rotated relative to the mounting seat 122. When the push rod assembly 4 is rotated upward from the rotated state to the vertical state, the locking piece 5531 and the clamping protrusion 5532 are separated from the first clamping slot 551 and the second clamping slot 552 respectively, due to the limiting stop wall 557, the push rod assembly 4 is stopped at the vertical position or close to the vertical position, and the push rod assembly 4 can only be rotated back and forth in one direction, and the push rod assembly 4 is prevented from continuing to rotate forward after reaching the vertical position.

[0063] The second unlocking assembly 54 includes a first unlocking piece 541 provided on the hand push rod 34, and the second unlocking assembly 54 further includes a plurality of pull rods 542 connected to the spline 524 and capable of pulling the spline 524 away from the spline groove 523 on the left connecting shell 521 when pulled, the ends of the plurality of pull rods 542 are connected with a pulling piece 543 capable of sliding the spline 524 when sliding, and the pulling piece 543 and the first unlocking piece 541 are provided with a push rod unlocking linkage 544. When only the rotation of the seat assembly 4 and the mounting seat 2 is needed, the first unlocking piece 541 is operated, and after the first unlocking piece 541 is operated, the push rod unlocking linkage 544 is pulled, the push rod unlocking linkage 544 drives the pulling piece 543 to slide horizontally, and the pulling piece 543 drives the pull rod 542 to slide and drives the spline 524 to slide and separate from the spline groove 523 on the left connecting shell 521 when the pulling piece 543 slides horizontally, at this time the push rod assembly 3 can be moved from the unfolded position to the vertical position.

[0064] The fourth locking assembly 56 comprises an adjusting locking block 561 arranged on the seat part 41, a locking piece 562 movably inserted into the adjusting locking block 561 arranged on the backrest part 43, a backrest adjusting locking elastic piece 563 arranged on the backrest part 43 and elastically pushing the locking piece 562 to be locked into the corresponding adjusting locking block 561, and a backrest unlocking linkage 565 arranged between the locking piece 562 and the backrest unlocking piece 564 and capable of driving the locking piece 562 to slide. When it is needed to adjust the position of the backrest part 43 relative to the seat part 41, the backrest unlocking piece 564 is operated, and the backrest unlocking piece 564 is operated to drive the backrest unlocking linkage 565 to move, and the backrest unlocking linkage 565 is moved to drive the locking piece 562 to slide and be separated from the adjusting locking block 561, so that the backrest part 43 can be adjusted by being rotated. When the backrest part 43 is adjusted to the position relative to the seat part 41, the backrest unlocking piece 564 is released, and the backrest adjusting locking elastic piece 563 pushes the locking piece 562 to be locked into the adjusting locking block 561 again, so that the seat part 41 and the backrest part 43 are locked. When it is needed to fold the seat assembly 4, the fourth locking assembly 56 is unlocked first, and then the backrest part 43 is pushed to be rotated towards the seat part 41.

[0065] The fifth locking assembly 57 comprises an armrest locking hole 571 arranged on the armrest part 42, an armrest locking piece 572 movably inserted into the armrest locking hole 571 arranged on the seat part 41, a top abutting part 573 arranged at one end of the armrest locking piece 572 and capable of being extended into the backrest part 43, an armrest linkage unlocking part 574 arranged on the backrest part 43, the armrest linkage unlocking part 574 pushing the top abutting part 573 to drive the armrest locking piece 572 to be separated from the armrest locking hole 571 to be unlocked when the backrest part 43 is rotated to a preset angle relative to the seat part 41, and an armrest locking elastic piece 575 arranged between the armrest locking piece 572 and the seat part 41 and capable of keeping the armrest locking piece 572 locked into the armrest locking hole 571. The armrest linkage unlocking part 574 is a pushing surface arranged on the backrest part 43, and the pushing surface on the backrest part 43 pushes the armrest linkage unlocking part 574 when the backrest part 43 is rotated, and the armrest linkage unlocking part 574 drives the armrest locking piece 572 to slide relative to the seat part 41 to drive the armrest locking piece 572 to be separated from the armrest locking hole 571, so that the armrest part 42 is unlocked, and the armrest part 42 is rotated towards the seat part 41 under the action of the gravity of the armrest part 42.

[0066] The sixth locking assembly 58 comprises a seat locking hole 581 arranged on the connecting base 2, the bottom of the seat part 41 is provided with a seat lock pin 582 which can be movably inserted into the seat locking hole 581, and the seat lock pin 582 and the armrest locking part 572 are provided with a seat unlocking linkage 583 which can drive the seat lock pin 582 to move away from the seat locking hole 581 when the armrest locking part 572 moves away from the armrest locking hole 571, and the seat lock pin 582 and the seat part 41 are provided with a seat locking elastic part 584 which can elastically push the seat lock pin 582 to keep it extended. When the backrest part 43 pushes the armrest locking part 572 to slide, the armrest locking part 572 pulls the seat unlocking linkage 583 to move, and the seat unlocking linkage 583 drives the seat lock pin 582 to slide upward relative to the connecting base 2 to move away from the seat locking hole 581, so that the seat part 41 can rotate relative to the connecting base 2 to rotate close to the leg 12.

[0067] The torsion spring 7 is arranged between the front leg 11 and the mounting base 122 to help the front leg 11 to automatically rotate close to the leg 12 when the front leg 11 is unlocked. When the front leg 11 is in the unfolded state, the torsion spring 7 is in the compressed state, and when the front leg 11 is folded, the torsion spring 7 moves from the compressed state to the normal state, at this time the torsion spring 7 exerts a pushing force on the front leg 11, so that the front leg 11 automatically rotates close to the leg 12.

[0068] The mounting base 122 and the rotating base 31 are directly provided with a seventh locking structure 59, the seventh locking structure 59 comprises a vertical locking position 591 arranged on the rotating base 31 and corresponding to the vertical position, the mounting base 122 is provided with a clamping block 592 which can slide relative to the mounting base 122 to clamp into or move away from the vertical locking position 591, the clamping block 592 is provided with an arc surface 5921 which can abut against the wall surface of the vertical locking position 591 to make the clamping block 592 slide, and the clamping block 592 and the mounting base 122 are provided with a spring 593 which can reset the clamping block 592. The vertical locking position 591 is a groove. When the push rod assembly 3 rotates relative to the connecting base 2 to the vertical state, the clamping block 592 is aligned with the vertical locking position 591, the spring 593 pushes the clamping block 592 to reset, at this time the clamping block 592 clamps into the vertical locking position 591.

[0069] The mounting base 2 is provided with a positioning pin 21, and the seat part 41 is provided with an accommodating groove 411 which can accommodate the positioning pin 21 when the seat part 41 is unfolded, and the accommodating groove 411 is provided with an abutting surface 412 which can abut against the positioning pin 21, so that the support between the seat part 41 and the mounting base 2 is more stable and the safety is better.

Claims

1. A child's pushchair having a collapsible base support frame (1) characterised in that The bottom support frame (1) comprises a front leg (11) with a front wheel (111) and a rear leg (12) with a rear wheel (121), the front leg (11) is rotatably connected with the rear leg (12), an upper part of the bottom support frame (1) is rotatably connected with a connecting seat (2), and the connecting seat (2) is rotatably connected with a push rod assembly (3); A first locking assembly (51) capable of locking the front leg (11) and the rear leg (12) relative to each other is arranged between the upper ends of the front leg (11) and the rear leg (12), a second locking assembly (52) capable of locking the push rod assembly (3) and the connecting seat (2) relative to each other is arranged between the push rod assembly (3) and the connecting seat (2), and a first unlocking assembly (53) for unlocking the first locking assembly (51) and the second locking assembly (52) is arranged on the connecting seat (2); A foldable seat assembly (4) capable of rotating relative to the bottom support frame (1) along with the connecting seat (2) to switch between a forward mode and a backward mode is further connected to the connecting seat (2), the seat assembly (4) comprises a seat part (41), an armrest part (42) and a backrest part (43), a fourth locking assembly (56) for locking the backrest part (43) relative to the seat part (41) is arranged between the backrest part (43) and the seat part (41), a backrest unlocking piece (564) for unlocking the fourth locking assembly (56) is arranged on the backrest part (43), a fifth locking assembly (57) for locking the armrest part (42) relative to the seat part (41) is arranged between the armrest part (42) and the seat part (41), and a sixth locking assembly (58) for locking the seat part (41) relative to the connecting seat (2) is arranged between the seat part (41) and the connecting seat (2); When the child stroller needs to be folded, the seat assembly (4) is adjusted to the backward mode, the fourth locking assembly (56) is first unlocked to make the backrest part (43) close to the seat part (41), and when the backrest part (43) is folded to a preset angle, the fifth locking assembly (57) is unlocked to make the armrest part (42) rotate and close to the seat part (41), the armrest part (42) is rotated and closed to a preset angle, and then the sixth locking assembly (58) is unlocked to make the seat part (41) rotate and close to the rear leg (12) relative to the connecting seat (2); when the seat part (41) rotates and closes to the rear leg (12) relative to the connecting seat (2), the seat part (41) unlocks the first unlocking assembly (53) to make the first locking assembly (51) and the second locking assembly (52) be unlocked correspondingly, and correspondingly, the push rod assembly (3) rotates relative to the connecting seat (2) to close to the rear leg (12), and when the push rod assembly (3) rotates to a preset angle, the front leg (11) is unlocked to make the push rod assembly (3) and the front leg (11) close to the rear leg (12). In the folding process, when the seat assembly (4) is closed to the rear leg (12), the push rod assembly (3) is also closed to the rear leg (12), at this time the weight of the entire stroller is close to the rear leg (12), and the rear leg (12) is used as a fulcrum, when the push rod assembly (3) and the rear leg (12) are in contact with the ground at the same time, the entire stroller can stand by itself through the push rod assembly (3) and the rear leg (12) when folding, and then the front leg (11) can rotate relative to the rear leg (12) and automatically close to the rear leg (12).

2. The stroller of claim 1, wherein The push rod assembly (3) and the front leg (11) are provided with a linkage assembly (6) that rotates the push rod assembly (3) relative to the connecting seat (2) to the rear leg (12) to a preset angle to make the push rod assembly (3) and the front leg (11) synchronously close to the rear leg (12).

3. The stroller of claim 1, wherein The push rod assembly (3) is provided with a second unlocking assembly (54) capable of unlocking the second locking assembly (52), and the bottom support frame (1) and the connecting seat (2) are provided with a third locking assembly (55) capable of relative locking to prevent the connecting seat (2) and the seat assembly (4) from rotating relative to the bottom support frame (1), and when the second locking assembly (52) is unlocked, the push rod assembly (3) can be rotated upward relative to the connecting seat (2) to a preset angle to unlock the third locking assembly (55).

4. The stroller of claim 2, wherein The rear leg (12) includes a mounting seat (122) and a rear leg rod (123) connected to the mounting seat (122), and the rear wheel (121) is connected to the rear leg rod (123), and the front leg (11) is rotatably connected to the mounting seat (122), and the connecting seat (2) is rotatably connected to the mounting seat (122), and the linkage assembly (6) includes a sliding piece (61) slidably connected in the mounting seat (122), and the rear end of the sliding piece (61) is provided with a driven gear portion (611), and the front end of the sliding piece (61) and the front leg (11) are pivotally connected with a linkage piece (62) capable of rotating relative to the two, and the push rod assembly (3) is connected with a rotating piece (63) in the connecting seat (2) and is connected with the rotating piece (63) synchronously, and the rotating piece (63) is provided with a driving gear portion (64) capable of meshing and transmitting with the driven gear portion (611) when the rotating piece (63) is rotated to a preset angle to make the push rod assembly (3) and the front leg (11) synchronously close to the rear leg (12).

5. The stroller of claim 3, wherein The push rod assembly (3) comprises rotatable seats (31) rotatably connected to the connecting seat (2), rotatable rods (32) connected in unison between the two rotatable seats (31), supporting rods (33) connected to the rotatable seats (31), and hand push rods (34) connected to the supporting rods (33). The second locking assembly (52) comprises left and right connecting shells (521 and 522) respectively arranged on the connecting seat (2). The left and right connecting shells (521 and 522) and the rotatable seats (31) are both provided with accommodation spaces and spline grooves (523). The accommodation spaces are movably provided with splines (524) for clamping the spline grooves (523). The splines (524) and the rotatable seats (31) are further provided with spline reset members (525). The first unlocking assembly (53) comprises a sliding block (531) slidingly connected in the connecting seat (2). The sliding block (531) is provided with a protruding lug (5311) on the side surface. The spline (524) is correspondingly provided with a groove (5241) matched with the lug (5311) on the side surface. The lug (5311) is provided with a first inclined sliding surface (5312). The groove (5241) is provided with a second inclined sliding surface (5242) matched with the first inclined sliding surface (5312) to make the lug (5311) push the spline (524) to correspondingly disengage from the spline grooves (523) on the left and right connecting shells (521 and 522). The seat part (41) is provided with a pushing surface (532) capable of pushing the sliding block (531) to slide when the seat part (41) rotates relative to the connecting seat (2). The sliding block (531) and the connecting seat (2) are provided with a pushing block elastic member (533) for resetting the pushing block (531).

6. The stroller of claim 1, wherein The rear leg (12) comprises a mounting seat (122) and a rear leg rod (123) connected to the mounting seat (122). The upper part of the front leg (11) is rotatably connected to the mounting seat (122). The connecting seat (2) is rotatably connected to the mounting seat (122). The first locking assembly (51) comprises a locking pin (511) arranged on the upper part of the front leg (11) and a clamping hook (512) rotatably arranged on the mounting seat (122) for clamping locking with the locking pin (511). The clamping hook (512) and the mounting seat (122) are provided with a clamping hook elastic member (513) capable of pushing the clamping hook (512) to reset so as to keep the clamping hook (512) clamped on the locking pin (511). The first unlocking assembly (53) further comprises a pushing block (534) slidingly connected in the mounting seat (122) and pushing the clamping hook (512) to rotate to disengage from the locking pin (511) when the sliding block (531) slides downward.

7. The stroller of claim 3, wherein The rear leg (12) comprises a mounting seat (122) and a rear leg rod (123) connected to the mounting seat (122), the upper portion of the front leg (11) is rotatably connected to the mounting seat (122), the connecting seat (2) is rotatably connected to the mounting seat (122), the push rod assembly (3) comprises a rotating rod (32) which is relatively rotatable and transversely penetrates the rotating shaft sleeve (555), the third locking assembly (55) comprises a sleeve (554), a rotating shaft sleeve (555) and a locking piece (553), the sleeve (554) is relatively fixedly arranged on the mounting seat (122), the rotating shaft sleeve (555) is rotatably connected with the sleeve (554), the connecting seat (2) is rotatably connected to the mounting seat (122) through the rotating shaft sleeve (555), the front side of the sleeve (554) is axially provided with a first clamping groove (551), the locking piece (553) is arranged in the rotating shaft sleeve (555) and is connected with the rotating rod (32) in a same-motion manner, the front and back sides of the rotating shaft sleeve (555) are axially provided with avoiding through grooves (556), the rear side of the sleeve (554) forms a limiting stop wall (557) so that the locking piece (553) can only be rotated and inclined in the direction of the rear leg (12); when the push rod assembly (3) is upwardly turned to a preset angle, the locking piece (553) is rotated with the rotating rod (32) to be separated from the first clamping groove (551), the connecting seat (2) is released from the mounting seat (122), and the seat assembly (4) can be rotated and changed direction with the connecting seat (2).

8. The stroller of claim 7, wherein The rear side of the sleeve (554) is axially provided with a second clamping groove (552), the depth of the second clamping groove (552) is smaller than that of the first clamping groove (551), and the limiting stop wall (557) is formed at the bottom of the second clamping groove (552) to limit the lower portion of the locking piece (553) to extend out of the rear side of the sleeve (554), so that the locking piece (553) can only be rotated and inclined in the direction of the rear leg (12).

9. The stroller of claim 5, wherein The second unlocking assembly (54) comprises a first unlocking piece (541) arranged on the hand push rod (34), further comprises a pull rod (542) connected to the spline (524) for driving the spline (524) to be separated from the spline groove (523) on the left connecting shell (521) and the right connecting shell (522), the end of the pull rod (542) is connected with a pulling piece (543), and the pushing rod unlocking linkage (544) is arranged between the pulling piece (543) and the first unlocking piece (541).

10. The stroller of claim 1, wherein The fourth locking assembly (56) comprises an adjusting clamping position (561) arranged on the seat portion (41), the backrest portion (43) is provided with a clamping piece (562) which can be movably inserted into the adjusting clamping position (561), the backrest portion (43) is provided with a backrest adjusting locking elastic piece (563) for elastically pushing the clamping piece (562) to be clamped into the corresponding adjusting clamping position (561), and the backrest unlocking linkage (565) which can drive the clamping piece (562) to slide is arranged between the backrest unlocking piece (564) and the clamping piece (562).

11. The stroller of claim 1, wherein The fifth locking assembly (57) comprises an armrest locking hole (571) arranged on the armrest (42), the seat (41) is provided with an armrest locking piece (572) which is movably inserted into the armrest locking hole (571), one end of the armrest locking piece (572) is provided with a top abutting part (573) which can extend into the backrest (43), the backrest (43) is further provided with an armrest linkage unlocking part (574), when the backrest (43) rotates relative to the seat (41) to a preset angle, the armrest linkage unlocking part (574) pushes the top abutting part (573) to make the armrest locking piece (572) disengage from the armrest locking hole (571) to release the lock, the armrest locking piece (572) and the seat (41) are provided with an armrest locking elastic piece (575) which makes the armrest locking piece (572) keep clamped into the armrest locking hole (571).

12. The stroller of claim 11, wherein The sixth locking assembly (58) comprises a seat locking hole (581) arranged on the connecting base (2), the bottom of the seat (41) is provided with a seat locking pin (582) which is movably inserted into the seat locking hole (581), the seat locking pin (582) and the armrest locking piece (572) are provided with a seat unlocking linkage (583) which links the armrest locking piece (572) and the seat locking pin (582) to make the seat locking pin (582) move to disengage from the seat locking hole (581) when the armrest locking piece (572) moves to disengage from the armrest locking hole (571), the seat locking pin (582) and the seat (41) are provided with a seat locking elastic piece (584) which elastically pushes the seat locking pin (582) to keep it extended.

13. The stroller of claim 1, wherein The rear leg (12) comprises a mounting base (122) and a rear leg rod (123) connected to the mounting base (122), the front leg (11) is rotatably connected to the mounting base (122), the connecting base (2) is rotatably connected to the mounting base (122), the front leg (11) and the mounting base (122) are provided with a torsion spring (7) which helps the front leg (11) automatically close to the rear leg (12) after the front leg (11) is released.

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