CN110712672A - Child's seat subassembly - Google Patents

Abstract

The invention discloses a child car seat assembly, comprising: a seat plate, a backrest and an armrest tube; a first joint and a pivot shaft are arranged on the seat plate, and a first elastic member, a first A clutch member, a first unlocking mechanism, a second joint, a linkage unlocking mechanism, a second clutch member, a second elastic member and a third joint. The stroller seat assembly with the above structure uses the first unlocking mechanism to drive the first clutch member to separate from the first joint or the second joint when it is folded and stored, and then rotates the backrest toward the seat plate. During this process, the second joint and the first joint The linkage unlocking mechanism between the two clutch members promotes the separation of the second clutch member from the first joint so that the armrest tube can rotate relative to the seat plate, thereby realizing the linkage unlocking of the armrest tube and the backrest, and improving the efficiency and convenience of folding and storage of the stroller seat assembly sex.

Description

A child car seat assembly

technical field

The present invention relates to a child car seat assembly.

Background technique

A typical stroller seat assembly includes a seat panel, a backrest, and an armrest tube rotatably disposed on the seat panel and located between the seat panel and the backrest. When the seat assembly is folded and stored, the armrest tube needs to be folded to the vicinity of the seat plate separately, and then the backrest is folded to the vicinity of the seat plate, resulting in very inconvenient folding.

Secondly, the angle adjustment mechanism of the backrest and the armrest tube of the current child car seat assembly is complicated, and it is impossible to easily realize multi-angle gear adjustment.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a child car seat assembly that facilitates the folding of the backrest and the armrest tube.

The technical scheme adopted by the present invention to solve its technical problems is:

A child car seat assembly, comprising: a seat plate, a first joint is arranged on the seat plate, and a pivot is arranged on the first joint;

The backrest is provided with a second joint, and the second joint is rotatably arranged on the first joint through the pivot;

a first clutch, movably arranged on the pivot shaft, located between the first joint and the second joint, and used for connecting or separating the second joint and the first joint;

a first elastic piece, connected with the first clutch piece, for driving the first clutch piece to connect the second joint with the first joint;

a first unlocking mechanism, movably arranged on the pivot shaft, capable of driving the first clutch member to separate from the first joint or the second joint so that the backrest can rotate relative to the seat plate;

a handrail pipe, the handrail pipe is provided with a third joint, and the third joint is rotatably arranged on the pivot shaft and is located on one side of the second joint;

The second clutch is movably arranged on the pivot, and is used to connect or separate the third joint from the first joint;

a second elastic member, connected with the second clutch member, for driving the second clutch member to connect the third joint with the first joint;

The linkage unlocking mechanism is arranged between the second clutch piece and the second joint, and can drive the second clutch piece to separate from the first joint so that the handrail tube can rotate relative to the seat plate.

Preferably, in some embodiments of the present invention, the first unlocking mechanism includes a first unlocking member rotatably disposed on the pivot shaft and a rotation driving mechanism connected with the first unlocking member, the rotation driving mechanism uses When the first unlocking member is driven to rotate around the pivot, the first unlocking member is located between the first clutch member and the second joint, and the end face of the first unlocking member facing the first clutch member abuts against the first clutch member In connection, a first wedge-shaped mechanism capable of driving the first clutch member to approach or move away from the first joint is provided between the end face of the first unlocking member facing the second joint and the second joint.

Preferably, in some embodiments of the present invention, the first wedge-shaped mechanism includes at least one first arc-shaped groove opened on the end surface of the first unlocking member facing the second joint, and one end of the first arc-shaped groove A first stop plane is provided, the other end of the first arc-shaped groove is provided with a first inclined surface, and the end surface of the second joint facing the first clutch member is provided with a first driving block matched with the first arc-shaped groove , the two ends of the first drive block are respectively provided with a second stop plane matched with the first stop plane and a second inclined plane matched with the first inclined plane, and the rotational drive mechanism is used to drive the first stop plane. The moving plane abuts against the second stop plane or drives the first inclined plane and the second inclined plane to move relatively.

Preferably, in some embodiments of the present invention, a plurality of first meshing teeth are distributed on the first clutch member around the circumference of the pivot shaft, and a plurality of first meshing teeth are arranged on the first joint. The first tooth slot, the second joint is provided with a plurality of second tooth slots matched with the first meshing teeth, one side of the first meshing tooth is provided with a first locking plane, and the other side of the first meshing tooth is provided with a first locking plane. One side is provided with a first guiding inclined surface, the second tooth slot is provided with a second locking plane matching with the first locking plane and a second guiding inclined surface matching with the first guiding inclined surface, and the backrest is away from When the seat plate rotates, the second locking plane abuts against the first locking plane, and when the backrest rotates close to the seat plate, the second guide slope can move relative to the first guide slope to make the second tooth The slot engages with another first meshing tooth.

Preferably, in some embodiments of the present invention, the first clutch member is provided with a first arc-shaped limiting groove whose center is located on the axis of the pivot shaft, and the second joint is provided with a A first arc-shaped limit block matched with an arc-shaped limit groove.

Preferably, in some embodiments of the present invention, a plurality of second meshing teeth are distributed on the pivot shaft around its axis, and a plurality of third teeth matching the second meshing teeth are arranged on the second clutch member the second elastic member drives the third tooth groove to engage with the second meshing teeth; the interlocking unlocking mechanism includes a first unlocking slope disposed on the end face of the second joint facing the second clutch member; the The second clutch member is provided with a second unlocking slope which is matched with the first unlocking slope. When the second joint rotates relative to the second clutch member, the first unlocking slope moves upward along the second unlocking slope to make the third tooth slot and the second unlocking slope move upward. The second meshing teeth are separated.

Preferably, in some embodiments of the present invention, one side of the second meshing tooth is provided with a third locking plane, the other side of the second meshing tooth is provided with a third guiding inclined surface, and the third tooth slot There is a fourth locking plane matching the third locking plane and a fourth guiding inclined plane matching the third guiding inclined plane. When the handrail tube is rotated towards the seat plate, the fourth locking plane and the third locking plane The stop planes are in contact with each other, and when the handrail tube is rotated away from the seat plate, the fourth guide inclined surface can move upward along the third guide inclined surface and make the third tooth slot and another second meshing tooth combined.

Preferably, in some embodiments of the present invention, the second clutch member is provided with a second arc-shaped limiting groove whose center is located on the axis of the pivot, and the pivot is provided with the first The second arc-shaped limit block is matched with the two arc-shaped limit grooves.

Preferably, in some embodiments of the present invention, the contour of the second clutch member is provided with a plurality of third meshing teeth, and the third joint is provided with a fourth tooth slot matched with the third meshing teeth, The third meshing teeth can reciprocate along the depth direction of the fourth tooth slots and keep the third meshing teeth coupled with the fourth tooth slots.

Preferably, in some embodiments of the present invention, a foot tube is connected to the seat plate through a joint device.

The beneficial effects of the present invention are: when the baby carriage seat assembly of the above structure is folded and stored, the first unlocking mechanism is used to drive the first clutch member to separate from the first joint or the second joint, and then the backrest is rotated toward the seat plate. During this process In the middle, the linkage unlocking mechanism between the second joint and the second clutch member promotes the separation of the second clutch member and the first joint so that the armrest tube can rotate relative to the seat plate, so as to realize the linkage unlocking of the armrest tube and the backrest, and improve the baby carriage seat. The convenience of component folding and storage.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

FIG. 1 is a schematic view of the appearance of an embodiment of the baby carriage seat assembly of the present invention;

2 is a schematic structural diagram of the first clutch member, the pivot, the first unlocking member, the second joint, the second clutch member and the third joint of FIG. 1 in an exploded state;

Fig. 3 is the partial enlarged schematic diagram of A part of Fig. 2;

FIG. 4 is a schematic diagram of another perspective of the overall structure of FIG. 3;

5 is a schematic diagram of the internal structure of the pivot joint of the seat plate, the backrest and the armrest tube of FIG. 1;

Fig. 6 is the structural representation of pivot;

Fig. 7 is the structural representation of the second joint;

FIG. 8 is a schematic structural diagram of the first unlocking member.

Detailed ways

This part will describe the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. Each technical feature and overall technical solution of the invention should not be construed as limiting the protection scope of the invention.

1 to 4, a child car seat assembly includes: a seat plate 10, a first joint 11 is provided on the seat plate 10, a pivot 8 is provided on the first joint 11, and the pivot 8 can be connected with the first joint 11 is fixedly connected, and can also be used as a part that can be detachably installed on the first joint 11; the backrest 20 is provided with a second joint 21 on the backrest 20, and the second joint 21 is rotatably arranged on the first joint 11 through the pivot 8 The first clutch member 4 is movably arranged on the pivot shaft 8 and is located between the first joint 11 and the second joint 21, and is used to connect or separate the second joint 21 and the first joint 11; An elastic member (not shown in the figure) is connected to the first clutch member 4 for driving the first clutch member 4 to connect the second joint 21 with the first joint 11. In this embodiment, the first The elastic member is a compression spring, which can drive the first clutch member 4 to move toward the second joint 21 and make the second joint 21 combine with the first joint 11 ; the first unlocking mechanism is movably arranged on the pivot 8 , the first clutch member 4 can be driven to separate from the first joint 11 or the second joint 21 so that the backrest 20 can rotate relative to the seat plate 10; the armrest tube 30, the armrest tube 30 is provided with a third joint 31, the third joint 31 is rotatably arranged on the pivot shaft 8 and is located on one side of the second joint 21; the second clutch member 5 is movably arranged on the pivot shaft 8 for connecting the third joint 31 with the first joint 11 connected or separated; a second elastic member (not shown in the figure), connected with the second clutch member 5, used to drive the second clutch member 5 to connect the third joint 31 with the first joint 11, In this embodiment, the second elastic member is a compression spring, which can drive the second clutch member 5 to move toward the third joint 31 and make the third joint 31 combine with the pivot 8 on the first joint 11; The unlocking mechanism is provided between the second clutch member 5 and the second joint 21 , and can drive the second clutch member 5 to separate from the first joint 11 so that the armrest tube 30 can rotate relative to the seat plate 10 . The stroller seat assembly with the above structure uses the first unlocking mechanism to drive the first clutch 4 to separate from the first joint 11 or the second joint 21 when it is folded and stored, and then rotates the backrest 20 toward the seat plate 10. During this process, The linkage unlocking mechanism between the second joint 21 and the second clutch member 5 promotes the separation of the second clutch member 5 from the first joint 11 so that the armrest tube 30 can rotate relative to the seat plate 10 , thereby realizing the linkage between the armrest tube 30 and the backrest 20 Unlock to improve the convenience of folding and storage of the stroller seat assembly.

Referring to FIGS. 3 and 4 , the first unlocking mechanism includes a first unlocking member 61 rotatably disposed on the pivot shaft 8 and a rotation driving mechanism connected with the first unlocking member 61 . The rotation driving mechanism uses In order to drive the first unlocking member 61 to rotate around the pivot shaft 8 , the first unlocking member 61 is located between the first clutch member 4 and the second joint 21 , and the first unlocking member 61 faces the position of the first clutch member 4 . The end face is in contact with the first clutch member 4 , and the end face of the first unlocking member 61 facing the second joint 21 and the second joint 21 are provided with a first wedge mechanism capable of driving the first clutch member 4 towards or away from the first joint 11 . . The rotational drive mechanism includes a wire rope connected to the first unlocking member 61, and a rotating member connected to the other end of the wire rope is provided on the backrest 20. The rotating member is provided with a torsion spring for resetting. When the rotating member is rotated, the wire rope pulls the first The unlocking member 61 rotates relative to the second joint 21 , and the first wedge-shaped mechanism forces the first unlocking member 61 to push the first clutch member 4 to move in the direction of the first joint 11 , thereby realizing the unlocking between the backrest 20 and the seat plate 10 . The rotation driving mechanism is a common technical means for those skilled in the art, and will not be described in detail here.

3, 4, 7, and 8, preferably, the first wedge-shaped mechanism includes at least one first arc-shaped groove 621 opened on the end surface of the first unlocking member 61 toward the second joint 21, One end of the first arc-shaped groove 621 is provided with a first stop plane 6211, the other end of the first arc-shaped groove 621 is provided with a first inclined plane 6212, and the end surface of the second joint 21 facing the first clutch member 4 is provided with The first drive block 622 matched with the first arc-shaped groove 621, the two ends of the first drive block 622 are respectively provided with a second stop plane 6221 matched with the first stop plane 6211 and a first inclined plane 6221 The second inclined surface 6222 matched with the 6212 is used for driving the first stop plane 6211 to abut against the second stop plane 6221 or to drive the first inclined plane 6212 and the second inclined plane 6222 to move relatively.

Preferably, a plurality of first meshing teeth 41 are distributed around the circumference of the pivot shaft 8 on the first clutch member 4 , and a plurality of first tooth slots that match the first meshing teeth 41 are arranged on the first joint 11 . 111. The second joint 21 is provided with a plurality of second tooth slots 211 which are matched with the first meshing teeth 41. In the working state, the first meshing teeth 41 on the first clutch member 4 are in the position of the first elastic member. Under the action, it engages with the first tooth slot 111 and the second tooth slot 211 at the same time, and when the first unlocking member 61 rotates, the first unlocking member 61 can push the first clutch member 4 to move inward to the first joint 11, the first engagement The tooth 41 is separated from the second tooth slot 211 and only combined with the first tooth slot 111 . One side of the first meshing tooth 41 is provided with a first locking plane 411 , and the other side of the first meshing tooth 41 is provided with a first locking plane 411 . The first guide slope 412, the second tooth slot 211 is provided with a second lock plane 2111 matching the first locking plane 411 and a second guide slope 2112 matching the first guide slope 412, the When the backrest 20 rotates away from the seat plate 10, the second locking plane 2111 abuts against the first locking plane 411, so that the backrest 20 is fixed relative to the seat plate 10, and when the backrest 20 is close to the seat plate When the 10 rotates, the second guide slope 2112 can move relative to the first guide slope 412 so that the second tooth slot 211 is combined with another first meshing tooth 41, thereby adjusting the angle between the backrest 20 and the seat plate 10. When the first unlocking mechanism does not work, the backrest 20 can only be rotated in a direction close to the seat plate 10 to adjust the angle between the backrest 20 and the seat plate 10 , but cannot be rotated in a direction away from the seat plate 10 to adjust the backrest 20 The angle with the seat plate 10.

Referring to FIGS. 3 and 4 , preferably, the first clutch member 4 is provided with a first arc-shaped limiting groove 42 whose center is located on the axis of the pivot shaft 8 , and the second joint 21 is provided with a The first arc-shaped limiting slot 42 is matched with the first arc-shaped limiting block 212 , and the cooperation between the first arc-shaped limiting slot 42 and the first arc-shaped limiting block 212 is used to limit the backrest 20 in the use state. The range of the included angle with the seat plate 10 .

Referring to FIG. 6 , preferably, a plurality of second meshing teeth 81 are distributed around the axis of the pivot shaft 8 , and a plurality of third tooth slots matching the second meshing teeth 81 are arranged on the second clutch member 5 51, the second elastic member drives the third tooth slot 51 to engage with the second meshing tooth 81, see FIG. 3 and FIG. 4, the linkage unlocking mechanism includes a set on the second joint 21 toward the second clutch member 5 The first unlocking slope 71 on the end face of the second clutch member 5 is provided with a second unlocking slope 72 that cooperates with the first unlocking slope 71. When the second joint 21 rotates relative to the second clutch member 5, the first unlocking slope 72 is An unlocking slope 71 moves upward along the second unlocking slope 72 to separate the third tooth slot 51 from the second engaging tooth 81 . Referring to FIGS. 3 and 4 , a plurality of third meshing teeth 53 are provided on the contour of the second clutch member 5 , and fourth tooth slots matching the third meshing teeth 53 are provided on the third joint 31 311, the third meshing tooth 53 can reciprocate along the depth direction of the fourth tooth slot 311 and keep the third meshing tooth 53 connected with the fourth tooth slot 311. When the linkage unlocking mechanism is not working, the second clutch member 5 Under the action of the second elastic member, the third joint 31 is connected to the pivot shaft 8 through the second clutch member 5 through the cooperation of the third tooth slot 51 and the second meshing teeth 81 , and when the second joint 21 When the third joint 31 is rotated toward the seat plate 10 , the first unlocking slope 71 can be linked with the second unlocking slope 72 to make the second clutch 5 move toward the third joint 31 , thereby causing the third joint 31 to disengage from the pivot. 8 connections.

Referring to FIG. 4 and FIG. 6 , preferably, a third locking plane 811 is provided on one side of the second meshing teeth 81 , and a third guiding inclined surface 812 is provided on the other side of the second meshing teeth 81 . The groove 51 is provided with a fourth locking plane 511 matching with the third locking plane 811 and a fourth guiding inclined plane 512 matching with the third guiding inclined plane 812. When the handrail tube 30 rotates toward the seat plate 10, the The fourth locking plane 511 abuts against the third locking plane 811 , when the armrest tube 30 rotates away from the seat plate 10 , the fourth guiding inclined plane 512 can move upward along the third guiding inclined plane 812 and make the third tooth slot 51 and the Another second meshing tooth 81 is engaged. Further, the angle between the armrest tube 30 and the seat plate 10 is adjusted. When the interlocking unlocking mechanism does not work, the armrest tube 30 can only be moved away from the seat because the force on the armrest tube 30 is pushed forward during use. The direction of the plate 10 is rotated to adjust the angle between the armrest tube 30 and the seat plate 10 , and the angle between the armrest tube 30 and the seat plate 10 cannot be adjusted by rotating in the direction close to the seat plate 10 .

Referring to FIGS. 4 and 6 , preferably, the second clutch member 5 is provided with a second arc-shaped limiting groove 52 whose center is located on the axis of the pivot shaft 8 , and the pivot shaft 8 is provided with a The second arc-shaped limit slot 52 is matched with the second arc-shaped limit block 82 , and the cooperation of the second arc-shaped limit slot 52 and the second arc-shaped limit block 82 is used to limit the handrail tube in the use state The range of the included angle between 30 and the seat plate 10.

Preferably, a foot tube 9 is connected to the seat plate 10 through a joint device, and the foot tube 9 is used to support the legs of the child and improve the riding comfort of the stroller seat assembly.

The above embodiments are only preferred solutions of the present invention, and the present invention may also have other embodiments, such as reasonable combinations of the technical solutions described in the multiple embodiments. Those skilled in the art can also make equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope set by the claims of the present application.

Claims (10)

1. A child car seat assembly, characterized in that, comprising: a seat plate (10), a first joint (11) is arranged on the seat plate (10), and a pivot (8) is arranged on the first joint (11); a backrest (20), the backrest (20) is provided with a second joint (21), and the second joint (21) is rotatably arranged on the first joint (11) through the pivot shaft (8); The first clutch member (4) is movably arranged on the pivot shaft (8), is located between the first joint (11) and the second joint (21), and is used for connecting the second joint (21) with the first joint (11) connected or separated; a first elastic member, connected with the first clutch member (4), for driving the first clutch member (4) to connect the second joint (21) with the first joint (11); A first unlocking mechanism, movably arranged on the pivot shaft (8), capable of driving the first clutch member (4) to separate from the first joint (11) or the first clutch member (4) and the second joint (21) so that the backrest (20) can be rotated relative to the seat plate (10); The handrail pipe (30) is provided with a third joint (31) on the handrail pipe (30), and the third joint (31) is rotatably arranged on the pivot shaft (8) and is located on one side of the second joint (21) ; The second clutch member (5) is movably arranged on the pivot shaft (8), and is used for connecting or separating the third joint (31) and the first joint (11); a second elastic member, connected with the second clutch member (5), for driving the second clutch member (5) to connect the third joint (31) with the first joint (11); The linkage unlocking mechanism is arranged between the second clutch member (5) and the second joint (21), and can drive the second clutch member (5) to separate from the first joint (11) so that the handrail tube (30) can be seated relative to each other The plate (10) rotates. 2. A child car seat assembly according to claim 1, wherein: The first unlocking mechanism includes a first unlocking member (61) rotatably arranged on the pivot shaft (8) and a rotation driving mechanism connected with the first unlocking member (61), and the rotation driving mechanism is used for driving all the The first unlocking member (61) rotates around the pivot (8), the first unlocking member (61) is located between the first clutch member (4) and the second joint (21), and the first unlocking member ( 61) The end face of the first clutch member (4) is in contact with the first clutch member (4), and the end face of the first unlocking member (61) towards the second joint (21) and the second joint (21) are provided with The first wedge-shaped mechanism capable of driving the first clutch member (4) close to or away from the first joint (11). 3. A stroller seat assembly according to claim 2, wherein: The first wedge-shaped mechanism includes at least one first arc-shaped groove (621) formed on the end surface of the first unlocking member (61) facing the second joint (21), and one end of the first arc-shaped groove (621) A first stop plane (6211) is provided, the other end of the first arc-shaped groove (621) is provided with a first inclined plane (6212), and the end surface of the second joint (21) facing the first clutch member (4) A first drive block (622) matched with the first arc-shaped groove (621) is provided, and two ends of the first drive block (622) are respectively provided with a first stop plane (6211) matched with the first drive block (6211). Two stop planes (6221) and a second slope (6222) matched with the first slope (6212), the rotational driving mechanism is used to drive the first stop plane (6211) and the second stop plane (6221) The first inclined surface (6212) and the second inclined surface (6222) are abutted or driven to move relatively. 4. A child car seat assembly according to claim 1 or 2 or 3, wherein: A plurality of first meshing teeth (41) are distributed around the circumference of the pivot shaft (8) on the first clutch member (4), and a plurality of first meshing teeth (41) are arranged on the first joint (11) The first tooth slot (111) is matched, the second joint (21) is provided with a plurality of second tooth slots (211) matched with the first meshing teeth (41), the first meshing teeth (41) ) is provided with a first locking plane (411) on one side, a first guide slope (412) is provided on the other side of the first meshing tooth (41), and the second tooth slot (211) is provided with a A second locking plane (2111) matching the locking plane (411) and a second guiding inclined plane (2112) matching with the first guiding inclined plane (412), the backrest (20) facing away from the seat plate ( 10) When rotating, the second locking plane (2111) abuts against the first locking plane (411), and when the backrest (20) rotates close to the seat plate (10), the second guiding slope (2112) ) can move relative to the first guide slope (412) so that the second tooth slot (211) is combined with another first meshing tooth (41). 5. The child car seat assembly of claim 4, wherein: The first clutch member (4) is provided with a first arc-shaped limiting groove (42) whose center is located on the axis of the pivot shaft (8), and the second joint (21) is provided with the An arc-shaped limiting groove (42) is matched with a first arc-shaped limiting block (212). 6. A child car seat assembly according to claim 1 or 2 or 3, wherein: A plurality of second meshing teeth (81) are distributed around the axis of the pivot shaft (8), and a plurality of third teeth matching the second meshing teeth (81) are arranged on the second clutch member (5). a slot (51), the second elastic member drives the third tooth slot (51) to engage with the second meshing tooth (81), and the interlocking unlocking mechanism comprises a second clutch disposed on the second joint (21) toward the second clutch The first unlocking slope (71) on the end face of the member (5), the second clutch member (5) is provided with a second unlocking slope (72) matched with the first unlocking slope (71), the second unlocking slope (72) When the joint (21) rotates relative to the second clutch member (5), the first unlocking slope (71) moves upward along the second unlocking slope (72) to make the third tooth slot (51) engage with the second meshing tooth (81) separation. 7. The child car seat assembly of claim 6, wherein: One side of the second meshing tooth (81) is provided with a third locking plane (811), and the other side of the second meshing tooth (81) is provided with a third guiding inclined surface (812). (51) is provided with a fourth locking plane (511) matching the third locking plane (811) and a fourth guiding slope (512) matching with the third guiding slope (812), the handrail tube (30) When rotating toward the seat plate (10), the fourth locking plane (511) abuts against the third locking plane (811), and when the handrail pipe (30) rotates away from the seat plate (10), the fourth locking plane (511) The guide slope (512) can move upward along the third guide slope (812) and make the third tooth slot (51) engage with another second meshing tooth (81). 8. The child car seat assembly of claim 7, wherein: The second clutch member (5) is provided with a second arc-shaped limiting groove (52) whose center is located on the axis of the pivot shaft (8), and the pivot shaft (8) is provided with the The second arc-shaped limiting block (82) is matched with the two arc-shaped limiting grooves (52). 9. The child car seat assembly of claim 1, wherein: The contour of the second clutch member (5) is provided with a plurality of third meshing teeth (53), and the third joint (31) is provided with fourth tooth slots (53) matching the third meshing teeth (53). 311), the third meshing teeth (53) can reciprocate along the depth direction of the fourth tooth slot (311) and keep the third meshing tooth (53) coupled with the fourth tooth slot (311). 10. A child car seat assembly according to claim 1, 2 or 3, wherein: A foot tube (9) is connected to the seat plate (10) through a joint device.

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