Child safety seat

Abstract

The present application relates to a child safety seat, comprising a first body, a second body, and a limiting mechanism. The first body comprises a base and an extension seat extending upward from the base. The second body is rotatably arranged on the base and is capable of facing a preset direction relative to the first body. The limiting mechanism is arranged between the first body and the second body. When the second body faces the preset direction relative to the first body, the extension seat and the second body are adapted to cooperate via the limiting mechanism so as to prevent the second body from tipping forward relative to the first body. In the child safety seat, the limiting mechanism is arranged between the extension seat of the first body and the second body, such that when the second body is arranged in a forward-facing position relative to the first body, cooperation between the extension seat and the second body is achieved via the limiting mechanism, thereby effectively preventing the second body from tipping forward relative to the first body. The limiting mechanism has a simple structure and is convenient for production, processing, and assembly.

Description

Child safety seat TECHNICAL FIELD

[0001] The present application relates to the technical field of child carriers, and particularly to a child safety seat. BACKGROUND

[0002] The child safety seats on the market generally include a first body and a second body mounted on the first body. The second body is generally arranged on the first body in a rotatable manner, so that the second body has different orientation directions relative to the first body, for example, the second body has two use modes of forward orientation and rearward orientation. When a car is subjected to external impact, the child's body is more likely to be pushed forward, and the second body has a risk of tipping over. Especially when used by older children, the second body is usually in the forward mode, and the greater the weight of the child, the greater the inertial force, and the greater the risk of the second body tipping forward. It is necessary to improve the child safety seat to reduce the risk of tipping over of the second body. SUMMARY

[0003] Therefore, it is necessary to provide a child safety seat that can effectively prevent the second body from tipping over to solve the above problems.

[0004] A child safety seat comprises:

[0005] A first body comprising a base and an extension seat extending upwardly from the base;

[0006] A second body rotatably arranged on the base and having a forward position and a rearward position relative to the first body;

[0007] A limiting mechanism arranged between the first body and the second body;

[0008] Wherein, when the second body is oriented towards the preset direction relative to the first body, the extension seat and the second body are adapted to cooperate through the limiting mechanism to prevent the second body from tipping forward relative to the first body.

[0009] In the child safety seat described above, the limiting mechanism is arranged between the extension seat of the first body and the second body, so that when the second body is arranged in the forward position relative to the first body, the extension seat and the second body are cooperated through the limiting mechanism, thereby effectively preventing the second body from tipping forward relative to the first body.

[0010] In one embodiment, the limiting mechanism comprises:

[0011] A limiting pin comprising a rod portion and a limiting portion connected to each other, one end of the rod portion away from the limiting portion being connected to the first connecting point with the second body or the extension seat; and

[0012] The limiting hole is arranged on the extension seat or the second body;

[0013] When the second body rotates relative to the first body to the preset direction, the rod portion is adapted to be clamped into the limiting hole, and the limiting portion is limited on the side of the limiting hole away from the first connecting point.

[0014] In one embodiment, the limiting mechanism further comprises:

[0015] The first limiting gear and the second limiting gear are rotatably arranged on the extension seat or the second body, and the first limiting gear and the second limiting gear partially overlap and form the limiting hole;

[0016] When the second body rotates relative to the first body to the preset direction, the rod portion is adapted to push the first limiting gear and the second limiting gear to rotate to clamp into the limiting hole formed between the first limiting gear and the second limiting gear.

[0017] In one embodiment, the first limiting gear is located above and behind the second limiting gear, and the first limiting gear and the second limiting gear partially overlap in the front-rear direction to form the limiting hole.

[0018] In one embodiment, the extension seat comprises an extension housing having a mounting cavity and an open slot in communication with the mounting cavity, the first limiting gear and the second limiting gear are located in the mounting cavity and are respectively pivoted to the first pivot point and the second pivot point of the extension housing, the rod portion is connected to the first connecting point of the second body, the first pivot point and the second pivot point are respectively located on both sides of the open slot, and during the rotation of the second body relative to the first body to the preset direction, the limiting portion extends into the mounting cavity through the open slot.

[0019] In one embodiment, the open slot extends in the left-right direction of the extension seat, the open slot comprises a first slot portion and two second slot portions located at both ends of the first slot portion, the width of the two second slot portions is greater than the width of the first slot portion, and the width of the second slot portion is greater than the maximum width of the limiting portion.

[0020] In one embodiment, the limiting portion is semispherical, comprising a semispherical surface and a circular surface connected to each other, and the circular surface is connected to the rod portion.

[0021] In one of the embodiments, the limiting mechanism comprises a limiting pin, the limiting pin comprises a rod portion and a limiting portion connected to each other, the rod portion is connected between the second body and the limiting portion;

[0022] The extension seat comprises an extension housing, the extension housing has a mounting cavity and an open slot in communication with the mounting cavity, when the second body rotates relative to the first body to the preset direction, the rod portion passes through the open slot, and the inner side edge of the open slot limits the limiting portion from escaping in the direction away from the first body.

[0023] In one of the embodiments, the limiting mechanism comprises:

[0024] a first clamping member arranged on the second body; and

[0025] a second clamping member arranged on the extension seat;

[0026] When the second body rotates to the preset direction, the first clamping member and the second clamping member are clamped.

[0027] In one of the embodiments, the extension seat is provided with a receiving slot, the second clamping member is arranged in the receiving slot, and the limiting mechanism further comprises a shielding assembly, the shielding assembly is used for selectively shielding the receiving slot.

[0028] In one of the embodiments, the shielding assembly comprises:

[0029] a shielding body movably arranged on the extension seat and switchable between a first position and a second position; and

[0030] a first reset member abutting between the extension seat and the shielding body, respectively;

[0031] When the shielding body is in the first position, the shielding body shields the receiving slot, and when the shielding body is in the second position, the receiving slot is at least partially exposed; the first clamping member is suitable for pushing the shielding body to move to the second position, and the first reset member applies force to the shielding body to move to the first position.

[0032] In one of the embodiments, the shielding body has an avoiding slot, the avoiding slot is shaped to be matched with the first clamping member, and when the shielding body is in the first position, the shielding body avoids the first clamping member through the avoiding slot.

[0033] In one of the embodiments, the extension seat or the second body further comprises a guide assembly, at least part of the avoiding slot is sleeved outside the guide assembly, and the shielding body moves along the guide assembly between the first position and the second position.

[0034] In one of the embodiments, the second engaging members are three, and the three second engaging members are arranged on the front face of the extension seat, and the geometric centers of the three second engaging members form three vertices of a virtual triangle.

[0035] In one of the embodiments, the virtual triangle is an isosceles triangle, and the vertex angle of the isosceles triangle is above or below the two base angles; and / or, at least one of the three second engaging members is located at the top of the front face of the extension seat.

[0036] In one of the embodiments, the preset direction is forward, the first engaging members are three, and the three first engaging members are arranged on the back face of the second body, and when the second body is rotated relative to the first body to face forward, the three second engaging members are connected and matched with the three first engaging members, respectively.

[0037] In one of the embodiments, the virtual triangle is an isosceles triangle, one of the second engaging members is above the other two second engaging members, and the vertex angle of the virtual triangle is above the two base angles, wherein the angle of the vertex angle of the virtual triangle is less than or equal to the angle of the base angle.

[0038] In one of the embodiments, the three second engaging members are distributed at a first height position and a second height position of the extension seat, and the first height position is above the second height position, and two of the second engaging members are at the same height in the up-down direction of the extension seat.

[0039] The preset direction is forward and backward, when the second body is rotated relative to the first body to face forward, the second engaging members distributed at the first height position are connected and matched with the first engaging members of the second body, and when the second body is rotated relative to the first body to face backward, the second engaging members distributed at the second height position are connected and matched with the first engaging members of the second body.

[0040] In one of the embodiments, the virtual triangle is an isosceles triangle, one of the second engaging members is distributed at a first height position of the extension seat, and the other two second engaging members are distributed at a second height position of the extension seat, and the vertex angle of the virtual triangle is above the two base angles.

[0041] In one of the embodiments, the angle of the vertex angle of the virtual triangle is greater than or equal to the angle of the base angle.

[0042] In one of the embodiments, the second engaging member is at least three and is arranged on the front surface of the extension seat, and the at least three second engaging members are distributed in at least two heights in the up-down direction of the extension seat.

[0043] In one of the embodiments, the extension seat is recessed to form an engaging groove, the engaging groove is arranged in the left-right direction of the extension seat, and one side groove wall of the engaging groove extends upward or downward to form the second engaging member.

[0044] In one of the embodiments, the engaging groove penetrates through the left and right sides of the extension seat, and the engaging groove has an avoiding groove part on both sides of the second engaging member.

[0045] In one of the embodiments, the limiting mechanism further comprises a limiting member, the limiting member is connected with the second body, the limiting member and the second body form a limiting groove, and when the second body rotates to face the preset direction, the limiting groove is engaged with the top of the extension seat; or

[0046] The limiting mechanism further comprises a limiting member, the limiting member is connected with the extension seat, the limiting member and the second body form a limiting groove, and when the second body rotates to face the preset direction, the limiting groove is engaged with the top of the second body.

[0047] In one of the embodiments, the limiting mechanism comprises:

[0048] a first engaging member arranged on one of the second body and the extension seat; and

[0049] a second engaging member rotatably arranged on the other one of the extension seat and the second body and switchable between an engaging position and a disengaging position, the second engaging member is engaged with the first engaging member when the second engaging member is in the engaging position, and the second engaging member is disengaged from the first engaging member when the second engaging member is in the disengaging position;

[0050] wherein, when the second body rotates to face the preset direction, the second engaging member is in the engaging position.

[0051] In one of the embodiments, the limiting mechanism further comprises:

[0052] a pushing rib arranged on one of the second body and the extension seat;

[0053] a linkage member movably arranged on the other one of the second body and the extension seat, the linkage member is drivingly connected with the second engaging member; and

[0054] A second reset member is arranged between the other one of the second body and the extension seat and the linkage member;

[0055] Wherein, when the second body rotates to the preset direction, the pushing rib pushes the linkage member to move, so that the linkage member drives the second clamping member to rotate to the clamping position; the second reset member is adapted to push the linkage member, so that the linkage member drives the second clamping member to rotate to the separation position.

[0056] In one of the embodiments, the limiting mechanism further comprises:

[0057] A linkage rod, one end of the linkage rod is connected with the linkage member, and the other end of the linkage rod is connected with the second clamping member;

[0058] Wherein, when the linkage member moves, the linkage member drives the second clamping member to rotate between the clamping position and the separation position through the linkage rod.

[0059] In one of the embodiments, the extension seat comprises:

[0060] An extension housing, having a mounting cavity, and a first communication slot and a second communication slot in communication with the mounting cavity;

[0061] Wherein, the pushing rib is arranged on the second body, at least part of the second clamping member, the linkage member and the second reset member are arranged in the mounting cavity, the first clamping member is arranged on the second body, in the process that the second body rotates to the preset direction, the pushing rib extends into the first communication slot to push the linkage member, or the pushing rib pushes the linkage member which at least part of the linkage member protrudes out of the first communication slot, and the linkage member drives the second clamping member to rotate to the clamping position, so that the second clamping member extends out through the second communication slot to be clamped with the first clamping member.

[0062] In one of the embodiments, the first communication slot is arranged along the left-right direction of the extension seat, the pushing rib is arranged along the left-right direction of the second body, and both ends of the pushing rib are provided with avoiding inclined surfaces.

[0063] In one of the embodiments, the first clamping member and the second clamping member are both hook-shaped structures; or, the first clamping member is a hook-shaped structure, and the second clamping member is a groove-shaped structure.

[0064] In one of the embodiments, the engaging member is in an "L" shape structure, comprising a first fixed part and a first inserting part connected with each other, the first fixed part is arranged on the back of the second body away from the first inserting part, the first inserting part extends downward from the end of the first fixed part away from the second body, the second engaging member is arranged on the top end of the extending seat and penetrates through the left and right sides of the extending seat, when the second body is turned to face the preset direction, the first inserting part is inserted into the first fixed part. BRIEF DESCRIPTION OF DRAWINGS

[0065] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are incorporated herein for a purpose of explanations of the present application and are not intended as an undue limitation to the present application.

[0066] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative work.

[0067] In addition, the drawings are not drawn in a 1:1 ratio, and the relative sizes of the various elements are only exemplarily drawn in the drawings, but not necessarily drawn in true proportions. In the drawings:

[0068] Fig. 1 is a structural schematic view of a child safety seat according to a first embodiment of the present application;

[0069] Fig. 2 is a structural schematic view of the child safety seat shown in Fig. 1 from another perspective;

[0070] Fig. 3 is a sectional view of Fig. 1 along line A-A;

[0071] Fig. 4 is a structural schematic view of a second body and part of a limiting mechanism in the child safety seat shown in Fig. 1;

[0072] Fig. 5 is a structural schematic view of the child safety seat shown in Fig. 1 with a first shell removed;

[0073] Fig. 6 is a structural schematic view of a first body in the child safety seat shown in Fig. 1;

[0074] Fig. 7 is a structural schematic view of the first body shown in Fig. 6 with a first shell removed;

[0075] Fig. 8 is a structural schematic view of a child safety seat according to a second embodiment of the present application;

[0076] Fig. 9 is a structural schematic view of the child safety seat shown in Fig. 8 from another perspective;

[0077] Fig. 10 is a structural schematic view of the second body and part of the limiting mechanism in the child safety seat shown in Fig. 8;

[0078] Fig. 11 is a structural schematic view of the first body and part of the limiting mechanism in the child safety seat shown in Fig. 8;

[0079] Fig. 12 is a structural schematic view of the first body and part of the limiting mechanism shown in Fig. 11 from another perspective, with the shielding body in the second position;

[0080] Fig. 13 is a structural schematic view of the first body and part of the limiting mechanism shown in Fig. 11 from another perspective, with the shielding body in the first position;

[0081] Fig. 14 is a structural schematic view of the first body and part of the limiting mechanism shown in Fig. 11, with the second shell and the shielding body removed;

[0082] Fig. 15 is a structural schematic view of the first body and part of the limiting mechanism shown in Fig. 11, with the second cover removed;

[0083] Fig. 16 is a structural schematic view of the first body and part of the limiting mechanism shown in Fig. 11, with the first shell removed;

[0084] Fig. 17 is a structural schematic view of the shielding body shown in Fig. 16;

[0085] Fig. 18 is a structural schematic view of a child safety seat according to a third embodiment of the present application;

[0086] Fig. 19 is a structural schematic view of the child safety seat shown in Fig. 18 from another perspective;

[0087] Fig. 20 is a structural schematic view of a child safety seat according to a fourth embodiment of the present application;

[0088] Fig. 21 is a structural schematic view of the second body in the child safety seat shown in Fig. 20;

[0089] Fig. 22 is a structural schematic view of the second body shown in Fig. 21, with the fourth shell removed;

[0090] Fig. 23 is a structural schematic view of the first body in the child safety seat shown in Fig. 20, with the second engaging member in the engaged position;

[0091] Fig. 24 is a structural schematic view of the first body in the child safety seat shown in Fig. 20, with the second engaging member in the disengaged position;

[0092] Fig. 25 is a structural schematic view of the first body shown in Fig. 23, with the first shell removed, and with the second engaging member in the engaged position;

[0093] Figure 26 is a schematic diagram of the structure of the first body shown in Figure 24 after the first shell is omitted. At this time, the second engaging component is in the engaging position.

[0094] Figure 27 is a structural schematic diagram of a child safety seat according to the fifth embodiment of this application, in which the second body faces forward relative to the first body;

[0095] Figure 28 is another structural schematic diagram of the child safety seat shown in Figure 27, in which the second body is oriented to the side relative to the first body;

[0096] Figure 29 is a side view of the child safety seat shown in Figure 27;

[0097] Figure 30 is a side view of the child safety seat shown in Figure 28;

[0098] Figure 31 is a top view of the child safety seat shown in Figure 27;

[0099] Figure 32 is a cross-sectional view along line GG in Figure 31;

[0100] Figure 33 is a cross-sectional view along line CC of Figure 31;

[0101] Figure 34 is a structural schematic diagram of the first body and part of the limiting mechanism in the child safety seat shown in Figure 27;

[0102] Figure 35 is a structural schematic diagram of the first body and part of the limiting mechanism shown in Figure 34 from another perspective;

[0103] Figure 36 is a schematic diagram of the structure in Figure 34 from the perspective of V1;

[0104] Figure 37 is a structural schematic diagram of a child safety seat according to the sixth embodiment of this application, in which the second body faces forward relative to the first body;

[0105] Figure 38 is another structural schematic diagram of the child safety seat shown in Figure 37, in which the second body is oriented to the side relative to the first body;

[0106] Figure 39 is a top view of the child safety seat shown in Figure 37;

[0107] Figure 40 is a cross-sectional view along line II in Figure 39;

[0108] Figure 41 is a structural schematic diagram of the first body and part of the limiting mechanism in the child safety seat shown in Figure 37;

[0109] Figure 42 is a structural schematic diagram of the first body and part of the limiting mechanism shown in Figure 41 from another perspective;

[0110] Figure 43 is a structural schematic diagram of the first body and part of the limiting mechanism shown in Figure 41 from the V2 perspective;

[0111] Fig. 44 is a side view of the child safety seat of the seventh embodiment of the present application, when the second body is oriented forwardly relative to the first body;

[0112] Fig. 45 is a structural schematic view of the child safety seat of Fig. 44, when the second body is oriented sidewardly relative to the first body;

[0113] Fig. 46 is a structural schematic view of the child safety seat of Fig. 45, from a bottom view perspective;

[0114] Fig. 47 is a side view of the child safety seat of Fig. 45;

[0115] Fig. 48 is a top view of the child safety seat of Fig. 44;

[0116] Fig. 49 is a sectional view of Fig. 48 along line E-E;

[0117] Fig. 50 is a structural schematic view of the first body and part of the limiting mechanism of the child safety seat of Fig. 44;

[0118] Fig. 51 is a top view of the first body and part of the limiting mechanism of Fig. 50, from a V3 perspective;

[0119] Fig. 52 is a front view of the first body and part of the limiting mechanism of Fig. 51;

[0120] Fig. 53 is a structural schematic view of the child safety seat of the eighth embodiment of the present application, when the second body is oriented sidewardly relative to the first body;

[0121] Fig. 54 is a structural schematic view of the child safety seat of Fig. 53, from a bottom view perspective;

[0122] Fig. 55 is a top view of the child safety seat of Fig. 53, when the second body is oriented forwardly relative to the first body;

[0123] Fig. 56 is a sectional view of Fig. 55 along line J-J;

[0124] Fig. 57 is a side view of the child safety seat of Fig. 53;

[0125] Fig. 58 is a side view of the child safety seat of Fig. 55;

[0126] Fig. 59 is a structural schematic view of the first body of the child safety seat of Fig. 53;

[0127] Fig. 60 is a top view of the first body of Fig. 59;

[0128] Fig. 61 is a structural schematic view of the first body of Fig. 59, from a V4 perspective;

[0129] Figure 62 is an elevational view of the first body of Figure 59.

[0130] 100, first body; 110, base; 111, mounting groove; 112, base upper cover; 113, base lower cover; 120, extension seat; 121, extension housing; 1211, extension front cover; 1211a, clamping groove; 1211b, main cover body; 1211c, edge cover body; 1201, opening groove; 1201a, first groove portion; 1201b, second groove portion; 1211d, arc cover; 1202, first communication groove; 1203, second communication groove; 1204, clamping groove; 1204a, avoiding groove portion; 1205, insertion groove; 1212, extension rear cover; 1212a, mounting seat; 1212b, first containing groove; 1210, mounting cavity; 1213, containing groove; 122, support assembly; 1221, first reinforcing piece; 1221a, reinforcing rib; 1222, second reinforcing piece; 1222a, reinforcing rib; 1223, fixed tube; 1224, reinforcing rod; 1225, abutting plate; 1226, limiting piece; 1226a, fixed plate; 1226b, limiting plate; 1227, guide assembly; 1228, guide rib; 1220, groove; 200, second body; 201, rotating base plate; 2011, outer cover; 202, seat body; 210, seat part; 211, seat upper cover; 212, seat bottom cover; 220, backrest part; 221, backrest housing; 2211, backrest front cover; 2212, backrest rear cover; 2212a, clamping opening; 2210, second containing cavity; 222, support frame body; 2221, mounting tube; 230, headrest part; 300, limiting mechanism; 310, limiting pin; 311, rod part; 312, limiting part; 3121, hemispherical surface; 3122, circular surface; 320, first limiting gear; 330, second limiting gear; 301, limiting hole; 340, first clamping piece; 341, hook part; 342, first fixed part; 343, first insertion part; 344, first insertion groove; 350, second clamping piece, insertion groove; 351, clamping rod; 352, U-shaped rod; 353, side rod; 354, connecting rod; 355, second fixed part; 356, second insertion part; 357, second insertion groove; 360, shielding assembly; 361, shielding body; 3611, avoiding groove; 3611a, first avoiding groove; 3611b, second avoiding groove; 3611c, third avoiding groove; 3612, abutting groove; 3613, arc surface; 362, first reset piece; 370, shielding piece; 380, limiting piece; 302, limiting groove; 391, pushing rib; 3911, avoiding inclined surface; 3912, pushing half rib; 392, linkage piece; 3920, second containing groove; 393, second reset piece; 394, linkage rod; 420, screw; 500, safety belt fixing mechanism; 510, clamping assembly; 511, clamping piece; 512, pivoting rod; 513, locking rod; 514, operating piece; 520, penetrating piece; M, first pivoting point; N, second pivoting point;P, first connection point; 101, first housing; 102, second housing; 103, first accommodating cavity; 203, third housing; 204, fourth housing; 205, fastening hole. DETAILED DESCRIPTION

[0131] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in many different ways from those described herein without departing from the scope of the present application, and it is understood that similar improvements can be made by those skilled in the art without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0132] The present application provides a child safety seat, comprising a first body 100, a second body 200 and a limiting mechanism 300. The first body 100 is adapted to be mounted on a car seat, and the second body 200 is adapted to carry and protect a child. The second body 200 is mountable on the first body 100, such that the second body 200 is connected to the car seat through the first body 100. The limiting mechanism 300 is disposed between the first body 100 and the second body 200, and is used to connect the first body 100 and the second body 200, and limit the second body 200 from tipping over relative to the first body 100. For the convenience of description, the present application takes the forward direction of the car as the forward direction, and takes the orientation of the child when the child is carried on the second body 200 as the orientation of the second body 200. The second body 200 can be rotated to different directions relative to the first body 100, so as to make the second body 200 be in different positions relative to the first body 100. For example, the second body 200 can be rotated to the forward direction or the rearward direction relative to the first body 100, or even to the lateral direction of the leftward or rightward direction. When the second body 200 is in one or more preset directions relative to the first body 100, the limiting mechanism 300 can further limit the first body 100 and the second body 200, so as to avoid the second body 200 from tipping over, for example, tipping over towards the front of the car. For example, the preset direction is the forward direction, when the second body 200 is rotated to the forward direction relative to the first body 100, the limiting mechanism 300 further connects and limits the second body 200 and the first body 100, so as to avoid the second body 200 from tipping over forward when the car suddenly stops; when the second body 200 is rotated to the lateral direction relative to the first body 100, the second body 200 and the first body 100 are separated at the limiting mechanism 300, and the limiting mechanism 300 does not further limit the second body 200 and the first body 100. For another example, the preset direction is the rearward direction, when the second body 200 is rotated to the rearward direction relative to the first body 100, the limiting mechanism 300 further connects and limits the second body 200 and the first body 100, so as to avoid the second body 200 from tipping over forward when the car suddenly stops. Alternatively, the preset direction can be multiple, for example, the forward direction and the rearward direction, when the second body 200 is rotated to any one of the forward direction and the rearward direction relative to the first body 100, the limiting mechanism 300 can further connect and limit the second body 200 and the first body 100, so as to avoid the second body 200 from tipping over forward when the car suddenly stops. The preset direction can also be the lateral direction and the like.

[0133] It should be noted that the second body 200 and the first body 100 have a locking structure (not shown) which can be operated to switch between a locked state and an unlocked state. When the locking structure is in the locked state, the mutual rotation between the first body 100 and the second body 200 is limited, and when the locking structure is in the unlocked state, the mutual rotation between the first body 100 and the second body 200 is allowed, so as to adjust the orientation of the second body 200.

[0134] In the following described embodiments and the child safety seat shown in the drawings, the preset direction will be mainly described as the front direction. For the embodiments with the preset direction being other directions, which are not shown in the drawings, will be briefly described. In addition, it should be noted that the terms representing directions such as "front", "back", "left", "right", "up", "down" described herein are consistent with the front, back, left, right, up, down directions of the baby seated in the second body 200 when the first body 100 is oriented in the front direction, unless otherwise specified. If it is specified as the "front", "back", "left", "right", "up", "down" directions of the second body 200, it is consistent with the front, back, left, right, up, down directions of the baby seated in the second body 200, and has nothing to do with the orientation of the second body 200. The "front", "back", "left", "right", "up", "down" directions are schematically shown by arrows F, B, L, R, U, D in the drawings, respectively.

[0135] First embodiment

[0136] As shown in FIG. 1 and FIG. 2, the first embodiment of the present application proposes a child safety seat. The child safety seat comprises a first body 100, a second body 200 and a limiting mechanism 300. The first body 100 comprises a base 110 and an extension seat 120 extending upwardly from the base 110. The second body 200 is rotatably connected to the base 110 and has a preset direction relative to the first body 100. The second body 200 can comprise a rotating base 201 and a seat body 202 above the rotating base 201, the seat body 202 comprising a seat part 210 mounted on the rotating base 201, a backrest part 220 extending upwardly from the seat part 210 and a headrest part 230 connected to the upper side of the backrest part 220. The seat body 202 is rotatably connected to the base 110 through the rotating base 201. Specifically, referring to FIG. 4 and FIG. 6, the base 110 is provided with a substantially circular mounting groove 111, and the rotating base 201 is at least partially mounted in the mounting groove 111 and rotatable in the mounting groove 111. The limiting mechanism 300 is arranged between the first body 100 and the second body 200. When the second body 200 is in the preset direction relative to the first body 100, the extension seat 120 and the second body 200 are adapted to cooperate through the limiting mechanism 300 to prevent the second body 200 from tilting relative to the first body 100. When the first body 100 is mounted on a car seat (not shown in the drawings), the back of the extension seat 120 is adapted to abut against the backrest of the car seat to make the installation of the child safety seat on the car seat more stable. In the embodiment, the second body 200 can rotate 360 degrees relative to the first body 100. When the child safety seat is installed on the car seat for use, the second body 200 can be rotated to face forward (as shown in FIG. 1) and backward (not shown in the drawings) relative to the first body 100, and the child sitting in the second body 200 can face forward or backward. In the embodiment, the aforementioned preset direction is forward, i.e. when the second body 200 is rotated to face forward relative to the first body 100, the extension seat 120 and the second body 200 are adapted to cooperate through the limiting mechanism 300 to prevent the second body 200 from tilting forward relative to the first body 100. At the same time, when the car is subjected to external impact, the child's head is prevented from displacing too far forward. When the second body 200 is rotated to face backward relative to the first body 100, the extension seat 120 and the second body 200 are not limited by the limiting mechanism 300, and the second body 200 remains connected to the base 110, so that when the car is subjected to external impact, the backrest part 220 of the second body 200 prevents the child from displacing forward to a certain extent. Of course, the second body 200 can also be temporarily rotated to face sideways, for example, left side, relative to the first body 100 for the convenience of the child getting in and out of the car through the side door.

[0137] Specifically, as shown in FIG. 2 and FIG. 3, the limiting mechanism 300 comprises a limiting pin 310. In the present embodiment, please refer to FIG. 4, the limiting pin 310 comprises a rod portion 311 and a limiting portion 312 connected with each other, and the maximum width of the limiting portion 312 is greater than that of the rod portion 311. The rod portion 311 is connected between the second body 200 and the limiting portion 312. In the present embodiment, the radial dimension of the limiting portion 312 is greater than that of the rod portion 311. Specifically, the limiting portion 312 is in a semi-spherical shape, comprising a semi-spherical surface 3121 and a circular surface 3122 connected with each other, and the circular surface 3122 is connected with one end of the rod portion 311. The limiting pin 310 of the present embodiment is roughly in a mushroom shape. The other end of the rod portion 311, i.e. the end away from the limiting portion 312, is connected with the first connecting point P of the second body 200. In the present embodiment, the other end of the rod portion 311 is fixed to the upper middle part of the backrest portion 220 of the second body 200 by means of a fastener such as a nut. The limiting mechanism 300 further comprises a limiting hole 301 in the extension seat 120. When the second body 200 is rotated relative to the first body 100 to face forward, the rod portion 311 is adapted to be clamped into the limiting hole 301, and the limiting portion 312 is limited to the side of the limiting hole 301 away from the first connecting point P.

[0138] As shown in FIG. 5 and FIG. 7, the limiting mechanism 300 can further comprise a first limiting gear 320 and a second limiting gear 330. The first limiting gear 320 and the second limiting gear 330 are both rotatably arranged in the extension seat 120, and the first limiting gear 320 and the second limiting gear 330 partially overlap and form the above-mentioned limiting hole 301. The hole diameter of the limiting hole 301 is smaller than the maximum width of the limiting portion 312. In the present embodiment, the first limiting gear 320 is located above and behind the second limiting gear 330. The first limiting gear 320 and the second limiting gear 330 partially overlap along the front-rear direction to form the above-mentioned limiting hole 301. In other embodiments, the front-rear positional relationship of the first limiting gear 320 and the second limiting gear 330 can be reversed, i.e. the first limiting gear 320 can be located above and in front of the second limiting gear 330.

[0139] Further, in the process of rotating the second body 200 relative to the first body 100 to the preset direction (i.e. to the front direction), the rod portion 311 is adapted to push the first limiting gear 320 and the second limiting gear 330 to rotate to be clamped in the limiting hole 301 formed between the first limiting gear 320 and the second limiting gear 330, and the limiting portion 312 is limited on the side of the first limiting gear 320 and the second limiting gear 330 away from the first connecting point P, i.e. the limiting portion 312 of the limiting pin 310 is formed with an undercut with the first limiting gear 320 and the second limiting gear 330, so as to prevent the second body 200 from falling forward relative to the first body 100 when a sudden impact is received. It should be noted that in some embodiments, the first limiting gear 320 and the second limiting gear 330 can be omitted, for example, in the process of rotating the second body 200 relative to the first body 100 to the preset direction (front direction), the rod portion 311 passes through the opening slot 1201 (for example, the first slot portion 1201a of the opening slot 1201), and the inner side edge of the opening slot 1201 limits the limiting portion 312 from escaping in the direction away from the first body 100. More specifically, the width of the first slot portion 1201a is smaller than the maximum width of the limiting portion 312, and the inner side edge of the first slot portion 1201a limits the limiting portion 312 from escaping forward. Here, no limitation is made as long as the limiting portion 312 can be limited to escape from the opening slot 1201 when the second body 200 is directed to the preset direction.

[0140] In some embodiments, the limiting portion 312 can also only include a hemispherical surface, and one end of the rod portion 311 is connected with the inner wall of the hemispherical surface. In other embodiments, the limiting portion 312 can have other shapes, such as a cube, a cone, etc., which are not limited in the present application.

[0141] Specifically, as shown in FIGS. 5-7, the extension seat 120 includes an extension shell 121 and a support assembly 122. The extension shell 121 includes an extension front cover 1211 and an extension rear cover 1212 that are buckled to each other and enclose a hollow mounting cavity 1210. The extension front cover 1211 is located in front of the extension rear cover 1212, i.e. the extension front cover 1211 faces the second body 200, and the extension rear cover 1212 faces away from the second body 200.

[0142] Specifically, as shown in FIGS. 5-7, the first body 100 comprises a first housing assembly (not numbered). In the present embodiment, the first housing assembly comprises a first housing 101 and a second housing 102 that are coupled to each other. The first housing 101 and the second housing 102 are coupled to each other to form a hollow first accommodating cavity 103. A portion of the first housing 101 forms an extension front cover 1211 of the extension seat 120, and another portion of the first housing 101 forms a base upper cover 112 of the base 110. A portion of the second housing 102 forms an extension rear cover 1212 of the extension seat 120, and another portion of the second housing 102 forms a base lower cover 113 of the base 110. That is, the extension seat 120 and the base 110 are in communication through the first accommodating cavity 103. In the present embodiment, the first housing 101 and the second housing 102 are integrally formed. In other embodiments, the first housing 101 and the second housing 102 can also be formed by different parts that are independent of each other and are connected by clamping, welding, or soldering, etc.

[0143] Further, as shown in FIGS. 5-7, the extension front cover 1211 is provided with an opening slot 1201 that is in communication with the mounting cavity 1210. The opening slot 1201 is arranged along the left-right direction of the extension seat 120. The opening slot 1201 comprises a first slot portion 1201a and two second slot portions 1201b at both ends of the first slot portion 1201a. The width of the two second slot portions 1201b is greater than the width of the first slot portion 1201a, and the width of the second slot portion 1201b is greater than the maximum width of the limiting portion 312, so as to support the limiting portion 312 to be screwed into the opening slot 1201. When the second body 200 is rotated relative to the first body 100 to face forward, the rod portion 311 is located in the first slot portion 1201a. The width of the first slot portion 1201a is less than the maximum width of the limiting portion 312, for example, the size of the first slot portion 1201a in the up-down direction is greater than the maximum width of the limiting portion 312 in the up-down direction, which can further avoid the limiting portion 312 from being detached from the opening slot 1201 forwardly from the first slot portion 1201a. In the present embodiment, the width of the second slot portion 1201b is greater than the maximum width of the limiting portion 312 in the same direction, for example, the size of the second slot portion 1201b in the up-down direction is greater than the maximum width of the limiting portion 312 in the up-down direction, as long as the edge of the second slot portion 1201b can avoid interfering with the limiting portion 312 to be detached from the opening slot 1201.

[0144] In this embodiment, as shown in FIG. 6, the extension front cover 1211 can include a main cover body 1211b and an edge cover body 1211c connected to the edge of the main cover body 1211b. The edge cover body 1211c is inclined relative to the main cover body 1211b, and specifically can be gradually inclined backward along a direction away from the main cover body 1211b. The left and right ends of the opening slot 1201 (i.e., the two second slot portions 1201b) also respectively extend from the main cover body 1211b to the left and right edge cover bodies 1211c. Such a setting is equivalent to the left and right ends of the opening slot 1201 penetrating through the left and right sides of the main cover body 1211b, i.e., so that the opening slot 1201 forms a through hole between the left and right sides of the main cover body 1211b and the edge cover body 1211c. Such a setting can make the push rib 391 more smoothly turn into the opening slot 1201.

[0145] As shown in Figures 5 and 7, the support assembly 122 is disposed within the mounting cavity 1210 and connected to the extension housing 121. Specifically, the support assembly 122 includes a first reinforcing member 1221. There are two first reinforcing members 1221, both disposed inside the extension front cover 1211, and respectively disposed on the upper and lower sides of the opening slot 1201. The first limiting gear 320 and the second limiting gear 330 are both located within the mounting cavity 1210 and are respectively pivotally connected to the extension front cover 1211 via fasteners (e.g., screws 420) through the two first reinforcing members 1221 at the first pivot point M and the second pivot point N. Of course, in other embodiments, the first limiting gear 320 and the second limiting gear 330 can also be directly pivotally connected to the extension front cover 1211 at the first pivot point M and the second pivot point N. The first reinforcing member 1221 includes a plurality of reinforcing ribs 1221a arranged in a crisscross pattern, which can enhance the connection strength between the first limiting gear 320 and the second limiting gear 330 and the extension front cover 1211. The limiting hole 301 formed between the first limiting gear 320 and the second limiting gear 330 is disposed opposite to the opening groove 1201. The support assembly 122 also includes a second reinforcing member 1222, which includes a plurality of reinforcing ribs 1222a arranged in a crisscross pattern. The second reinforcing member 1222 is disposed on the lower side opposite to the first reinforcing member 1221 and is disposed on the inner side of the extended front cover 1211 to enhance the support strength of the extended front cover 1211. The support assembly 122 also includes two fixing tubes 1223, both of which extend along the vertical direction of the extension seat 120. The two fixing tubes 1223 are spaced apart. In this embodiment, a second reinforcing member 1222 is provided between the two fixing tubes 1223. A second reinforcing member 1222 is provided between each fixing tube 1223 and the side wall of the extension housing 121. For example, the two fixing tubes 1223 are respectively provided with second reinforcing members 1222 between the left side wall and the right side wall of the extension housing 121. As shown in Figure 7, the support assembly 122 also includes two reinforcing rods 1224, which are spaced apart along the vertical direction of the extension seat 120. Both ends of the two reinforcing rods 1224 are connected to two fixing tubes 1223, respectively. In this embodiment, both reinforcing rods 1224 are located opposite each other above the mounting cavity 1210, approximately at the positions where the first limiting gear 320 and the second limiting gear 330 are located. The reinforcing rods 1224 help to strengthen the structural strength of the entire support assembly 122.

[0146] Please refer to Figures 4 to 7. During the process of the second body 200 gradually rotating relative to the first body 100 from, for example, rearward to forward, the limiting portion 312 of the limiting pin 310 on the second body 200 first enters the mounting cavity 1210 through one of the second groove portions 1201b of the opening groove 1201. As the second body 200 continues to rotate, the rod portion 311 of the limiting pin 310 simultaneously pushes against the first limiting gear 320 and the second limiting gear 330, causing the first limiting gear 320 and the second limiting gear 330 to rotate simultaneously (in this embodiment, the rotation directions of the first limiting gear 320 and the second limiting gear 330 are opposite). While pushing against the first limiting gear 320 and the second limiting gear 330, the rod portion 311 of the limiting pin 310 gradually engages with the limiting hole 301 formed between the first limiting gear 320 and the second limiting gear 330. After the rod portion 311 of the limiting pin 310 is inserted into the limiting hole 301, since the diameter of the limiting hole 301 is smaller than the radial dimension of the limiting portion 312, the limiting portion 312 is limited to the side of the first limiting gear 320 and the second limiting gear 330 facing away from the first connection point P. The limiting portion 312 is restricted from moving forward and disengaging from the opening slot 1201. That is, the limiting portion 312 of the limiting pin 310 forms an overlock with the first limiting gear 320 and the second limiting gear 330, thereby preventing the second body 200 from tilting forward relative to the first body 100 when subjected to a sudden impact. When the second body 200 needs to continue rotating relative to the first body 100 or rotate in the opposite direction, for example, to the rearward direction, the limiting portion 312 of the limiting pin 310 can continue to push against the first limiting gear 320 and the second limiting gear 330 in the original direction, or push against the first limiting gear 320 and the second limiting gear 330 in the opposite direction, so as to gradually move out of the limiting hole 301. After the rod portion 311 of the limiting pin 310 moves out of the limiting hole 301, the second body 200 continues to rotate, so that the rod portion 311 of the limiting pin 310 moves along the opening groove 1201 and so that the limiting portion 312 of the limiting pin 310 finally rotates out from the second groove portion 1201b on the other side or the same second groove portion 1201b that it originally entered.

[0147] Of course, in other embodiments, the positions of the limiting pin 310, the first limiting gear 320, and the second limiting gear 330 can be adjusted as needed. For example, the limiting pin 310 can be located on the front of the extension seat 120 (which can be understood as extending the front cover 1211), while the first limiting gear 320 and the second limiting gear 330 can be located on the back of the backrest 220 (which can be understood as backresting the rear cover 2212), etc. This application does not impose any limitations on this.

[0148] Furthermore, as shown in Figures 6 and 16, the extension seat 120 is also provided with a seat belt fixing mechanism 500, so that the car seat belt (not shown in the figures) can be wrapped and fixed to the extension seat 120, thereby fixing the child safety seat to the car seat. In this embodiment, the seat belt fixing mechanism 500 may include a clamping assembly 510. The clamping assembly 510 may include a clamping member 511. The clamping member 511 is rotatably disposed on the extension seat 120 and can be switched between a retracted position and an open position. In this embodiment, a clamping groove 1211a is provided approximately in the middle of the extension front cover 1211, and a pivot rod 512 is provided at a lower position of the clamping groove 1211a. One end of the clamping member 511 is pivotally connected to the pivot rod 512. A locking rod 513 may also be provided at a higher position of the clamping groove 1211a. When the clamping member 511 is in the retracted position, it can be locked with the locking rod 513, and when the clamping member 511 is in the open position, it can be disengaged from the locking rod 513. The clamping assembly 510 may include an operating member 514, which can be operated to disengage the clamping member 511 from the locking lever 513, allowing it to rotate between a retracted position and an open position. The seatbelt securing mechanism 500 also includes at least two through-hole members 520, both of which are located on the extended front cover 1211. In this embodiment, there are two through-hole members 520, located on the left and right sides of the clamping assembly 510, respectively. When it is necessary to wrap and secure the car seat belt to the extension seat 120, the car seat belt can first pass through the through member 520 on one side, and then the operating member 514 is operated to release the locking engagement between the clamping member 511 and the locking lever 513. At this time, the clamping member 511 can be rotated from the closed position to the open position, and the car seat belt can be passed between the extension front cover 1211 and the clamping member 511. Then the car seat belt passes through the through member 520 on the other side to secure the car seat belt to the extension seat 120. Then the clamping member 511 is rotated from the open position to the closed position to clamp the car seat belt to the first body 100.

[0149] Second Embodiment

[0150] As shown in Figures 8 and 9, a second embodiment of this application proposes a child safety seat. This child safety seat includes a first body 100, a second body 200, and a limiting mechanism 300. The structure and connection relationship of the first body 100 and the second body 200 in this embodiment are largely the same as those in the first embodiment, and will not be repeated here. The main difference between the child safety seat in this embodiment and the child safety seat in the first embodiment lies in the limiting mechanism 300.

[0151] As shown in Figures 8 and 9, the limiting mechanism 300 in this embodiment includes a first engaging member 340 and a second engaging member 350. The first engaging member 340 is disposed on the second body 200, and the second engaging member 350 is disposed on the extension seat 120. When the second body 200 rotates to face forward, the first engaging member 340 and the second engaging member 350 engage. In this embodiment, both the first engaging member 340 and the second engaging member 350 are hook-shaped structures, and can be referred to as the first engaging hook and the second engaging hook, respectively. Of course, in other embodiments, the first engaging member 340 and the second engaging member 350 can also be a recess and a protrusion that can cooperate with each other.

[0152] Specifically, as shown in Figure 10, the first latching member 340 is generally sheet-like, forming an angle with the back of the backrest 220. One side of the first latching member 340 is disposed on the backrest 220 of the second body 200, and the other side extends downward and then bends towards the backrest 220 to form a hook 341. The limiting mechanism 300 in this embodiment also includes a blocking member 370, which is generally sheet-like. One side of the blocking member 370 is disposed on the top of the backrest 220, and its position is higher than that of the first latching member 340. The blocking member 370 completely covers the side of the first latching member 340 facing away from the backrest 220 to block at least a portion of the first latching member 340, thereby making the appearance of the second body 200 look neater.

[0153] As shown in Figures 11 and 12, the top of the extension base 120, specifically the top of the extension housing 121, has a rearward-facing receiving groove 1213 that extends through both sides of the extension housing 121 in a left-right direction. This receiving groove 1213 communicates with the mounting cavity 1210 of the extension base 120. A second engaging member 350 is disposed within the receiving groove 1213. Specifically, as shown in Figures 14 and 16, the second engaging member 350 is a rod-shaped structure, including an engaging rod 351, two U-shaped rods 352, two side rods 353, and two connecting rods 354. Specifically, the engaging rod 351 extends approximately along the left-right direction of the extension seat 120. Both ends of the engaging rod 351 are connected to one end of each of the two side rods 353 via two U-shaped rods 352. Both side rods 353 extend approximately along the up-down direction of the extension seat 120. One end of each of the two connecting rods 354 is connected to the other end of each of the two side rods 353. Both connecting rods 354 extend approximately along the left-right direction of the extension seat 120. The other ends of each connecting rod 354 are connected to two fixing tubes 1223. In this embodiment, the engaging rod 351 is located above the connecting rods 354. Referring also to Figure 12 in this embodiment, the top of the front extension cover 1211 forms an arc-shaped cover 1211d that matches the curvature of the two U-shaped rods 352. The aforementioned receiving groove 1213 is formed between the arc-shaped cover 1211d and the top of the rear extension cover 1212 at an interval. The two U-shaped rods 352 and the engaging rod 351 of the second engaging member 350 are located below the arc-shaped cover 1211d. When the second body 200 rotates to the forward position relative to the first body 100, the engaging rod 351 is adapted to engage with the hook portion 341 of the first engaging member 340, and the engaging rod 351 is located above the hook portion 341 when engaged, as shown in Figure 9.

[0154] Further, as shown in Figures 15 to 17, the limiting mechanism 300 in this embodiment also includes a shielding component 360, which selectively shields the receiving groove 1213. The shielding component 360 includes a shielding body 361 and a first reset member 362. The shielding body 361 is movably disposed within the receiving groove 1213 and can switch between a first position and a second position. The first reset member 362 abuts against the extension seat 120 and the shielding body 361 respectively. As shown in Figure 13, when the shielding body 361 is in the first position, the shielding body 361 shields the receiving groove 1213 to avoid accidental clamping or allowing dirt to fall into the receiving groove 1213 or the mounting cavity 1210. As shown in Figure 12, when the shielding body 361 is in the second position, the receiving groove 1213 is at least partially exposed. In this embodiment, at least a portion of the shielding body 361 is retracted into the mounting cavity 1210, thereby exposing at least a portion of the receiving groove 1213 to facilitate engagement between the first engaging member 340 and the second engaging member 350. The first engaging member 340 is adapted to push the shielding body 361 to move to a second position, and the first resetting member 362 applies force to the shielding body 361 to move it to a first position.

[0155] In embodiments not shown, the shielding body 361 may not be disposed within the receiving groove 1213. The shielding body 361 may be configured to selectively cover the receiving groove 1213, thereby achieving the purpose of shielding the receiving groove 1213 or making the receiving groove 1213 at least partially exposed.

[0156] Please refer to Figure 17. The shielding body 361 has a relief groove 3611. The shape of the relief groove 3611 is adapted to the first engaging member 340. When the shielding body 361 is in the first position, the shielding body 361 avoids the first engaging member 340 through the relief groove 3611, so as to avoid hard collision interference with the second engaging member 350 when the shielding body 361 is reset under the elastic restoring force of the first reset member 362. Specifically, the relief groove 3611 includes two first relief grooves 3611a that penetrate the shielding body 361 in the vertical direction and a second relief groove 3611b that is arranged in the horizontal direction. The two first relief grooves 3611a and the second relief groove 3611b are connected. The two first clearance grooves 3611a are mainly used to avoid the two side rods 353, and the second clearance groove 3611b is mainly used to avoid the locking rod 351. The connection between the two first clearance grooves 3611a and the second clearance groove 3611b is mainly used to avoid the two U-shaped rods 352. The upper surface of the shielding body 361 is also provided with a third clearance groove 3611c, and the second clearance groove 3611b is opened at the bottom of the third clearance groove 3611c. The third clearance groove 3611c is used to avoid the arc-shaped cover 1211d. Both ends of the shielding body 361 are also provided with arc-shaped surfaces 3613 that slope downwards along the direction near the edge. These two arc-shaped surfaces 3613 can be adapted to the first locking member 340 to facilitate mutual sliding and pushing between the first locking member 340 and the shielding body 361.

[0157] Further, as shown in Figure 14, the support assembly 122 also includes a guide assembly 1227. In this embodiment, there are two guide assemblies 1227, spaced apart on the inner side of the extended front cover 1211. Taking one of the guide assemblies 1227 as an example, the guide assembly 1227 includes two guide ribs 1228, which are arranged opposite to each other and extend approximately in the vertical direction. A groove 1220 extending in the vertical direction is formed between the two guide ribs 1228. Two side rods 353 are respectively disposed in the two grooves 1220. Thus, the guide assembly 1227 can position the two side rods 353. Further, the two guide assemblies 1227 are also respectively located in the two first clearance grooves 3611a of the shielding body 361, and the shielding body 361 can slide relative to the two guide assemblies 1227 respectively. Thus, the guide assembly 1227 can also guide and limit the shielding body 361, thereby guiding the sliding path of the shielding body 361.

[0158] Please refer to Figure 15. The support assembly 122 also includes an abutment plate 1225, which is generally rectangular in shape. The abutment plate 1225 extends approximately along the left-right direction of the extension seat 120 and is laterally fixed to the two fixing tubes 1223. One side of the two abutment plates 1225 can be disposed on the inner side of the extension front cover 1211. The shielding body 361 is located above the abutment plate 1225 and has an abutment groove 3612 facing the opening of the abutment plate 1225. In this embodiment, there are two first reset members 362, which are located on the left and right sides of the two fixing tubes 1223, respectively. One end of each of the two first reset members 362 abuts against the abutment plate 1225, and the other end extends into the abutment groove 3612 and abuts against the bottom of the abutment groove 3612 or a positioning post inside the abutment groove 3612. In this embodiment, the first reset member 362 is a spring. The support assembly 122 may further include a limiting member 1226 disposed within the mounting cavity 1210. The limiting member 1226 restricts the movement of the shielding body 361 along the left-right direction of the extension seat 120, preventing unintended movement of the shielding body 361 during switching between the first and second positions. Specifically, the first engaging member 340 first pushes against the shielding body 361 from one side, and the limiting member 1226 prevents the shielding body 361 from being pushed and displaced in the left-right direction. Specifically, the limiting member 1226 has a generally U-shaped plate structure, including a fixing plate 1226a and limiting plates 1226b connected to both sides of the fixing plate 1226a. The fixing plate 1226a is disposed on the inner side of the extension front cover 1211, and the two limiting plates 1226b are respectively disposed adjacent to the left and right sides of the shielding body 361.

[0159] Please refer to Figures 9 and 14 to 16. During the rotation of the second body 200 relative to the first body 100 to a forward-facing position, the hook 341 of the first engaging member 340 gradually rotates into the receiving groove 1213 from the through-hole on one side, while simultaneously pressing downwards against the shielding body 361. This causes the shielding body 361 to gradually move from a first position covering the receiving groove 1213 to a second position, i.e., the shielding body 361 gradually retracts into the mounting cavity 1210 without covering or avoiding the receiving groove 1213. This allows the hook 341 of the first engaging member 340 to engage with the engaging rod 351 of the first engaging member 350. At this time, the first resetting member 362 is compressed and deformed. This prevents the second body 200 from tilting forward relative to the first body 100 when the child safety seat is subjected to a sudden impact. When the second body 200 needs to continue rotating relative to the first body 100 or rotate back to, for example, a rearward position, the hook 341 of the first engaging member 340 can gradually rotate out of the receiving groove 1213 from the through-hole on the opposite side or the through-hole on the same side. The first engaging member 340 and the second engaging member 350 are released from engagement, and the second body 200 and the first body 100 are released from their limiting positions. At this time, the shielding body 361 is no longer pressed by the hook 341 of the first engaging member 340, and under the action of the elastic restoring force of the first restoring member 362, it moves from the second position back to the first position, thereby restoring the shielding of the receiving groove 1213.

[0160] Of course, in other embodiments, the positions of the first card holder 340, the second card holder 350, the shielding component 360, and the blocking component 370 can be adjusted as needed. For example, the first card holder 340 and the blocking component 370 can be positioned on the front of the extension base 120 (which can also be understood as extending the front cover 1211), while the second card holder 350 and the shielding component 360 can be positioned on the back (which can also be understood as backing against the rear cover 2212), etc. This application does not impose any limitations on this.

[0161] Third Embodiment

[0162] As shown in Figures 18 and 19, a third embodiment of this application proposes a child safety seat. This child safety seat includes a first body 100, a second body 200, and a limiting mechanism 300. The structure and connection relationship of the first body 100 and the second body 200 in this embodiment are largely the same as those in the first embodiment, and will not be repeated here. The main difference between the child safety seat in this embodiment and the child safety seat in the first embodiment lies in the limiting mechanism 300.

[0163] Specifically, as shown in Figures 18 and 19, the limiting mechanism 300 in this embodiment includes a limiting member 380. The limiting member 380 is generally rectangular in shape. One side of the limiting member 380 is connected to the top of the backrest portion 220 of the second body 200, and the other side of the limiting member 380 extends away from the backrest portion 220 so that the backrest portion 220 and the backrest portion 220 are angled to form a limiting groove 302, through which the top of the extension seat 120 can pass. In this embodiment, the limiting member 380 is integrally formed with the top structure of the backrest portion 220 of the second body 200 to achieve connection; of course, in other embodiments, one side of the limiting member 380 may also be a component independent of the backrest portion 220, and the limiting member 380 may be connected to the backrest portion 220 by means of welding or fastener connection, for example. When the second body 200 rotates to face forward, the limiting groove 302 engages with the top of the extension seat 120. That is, the back of the limiting member 380 and the backrest 220 cover and limit at least a portion of the top of the extension seat 120, thereby preventing the second body 200 from tilting forward relative to the first body 100 when the child safety seat is subjected to a sudden impact while the second body 200 is facing forward relative to the first body 100.

[0164] Please refer to Figures 18 and 19 together. When the second body 200 rotates relative to the first body 100 to face forward, the limiting member 380 gradually rotates to the rear side of the extension seat 120, that is, the top of the extension seat 120 gradually enters the limiting groove 302, so that the limiting member 380 and the back of the backrest 220 cover and limit at least a portion of the top of the extension seat 120. In this way, the second body 200 can be prevented from tilting forward relative to the first body 100 when the child safety seat is subjected to a sudden impact. When it is necessary for the second body 200 to continue rotating relative to the first body 100 or to rotate in the opposite direction to, for example, the rearward position, the limiting member 380 gradually separates from the rear side of the extension seat 120, that is, the top of the extension seat 120 can gradually rotate out of the limiting groove 302 to release the limitation between the extension seat 120 and the backrest 220.

[0165] In this embodiment, the top of the backrest 220 is higher than the top of the extension seat 120. Therefore, a limiting member 380 can be provided on the top of the backrest 220 to cover and limit the top of the extension seat 120. In other embodiments, the top of the extension seat 120 can also be set higher than the top of the backrest 220. In this case, the limiting member 380 can be provided on the top of the extension seat 120, so that the limiting member 380 and the front of the extension seat 120 cover and limit the top of the backrest 220.

[0166] Fourth embodiment

[0167] As shown in Figure 20, the fourth embodiment of this application proposes a child safety seat. The child safety seat includes a first body 100, a second body 200, and a limiting mechanism 300. The structure and connection relationship of the first body 100 and the second body 200 in this embodiment are largely the same as those in the first embodiment, and will not be repeated here. The main difference between the child safety seat in this embodiment and the child safety seat in the first embodiment lies in the limiting mechanism 300.

[0168] As shown in Figure 20, the limiting mechanism 300 in this embodiment includes a first engaging member 340, a second engaging member 350, a pushing rib 391, and a linkage member 392. The first engaging member 340 is connected to the backrest portion 220 of the second body 200. The second engaging member 350 is rotatably disposed on the extension seat 120 and can switch between an engaged position and a disengaged position. When the second engaging member 350 is in the engaged position, it engages with the first engaging member 340; when the second engaging member 350 is in the disengaged position, it disengages from the first engaging member 340. When the second body 200 rotates to face forward, the second engaging member 350 is in the engaged position. Referring also to Figure 21, the pushing rib 391 is connected to the backrest portion 220 of the second body 200 and is located above the first engaging member 340. Referring also to Figure 26, the linkage member 392 is movably disposed on the extension seat 120. Furthermore, the limiting mechanism 300 may also include a linkage rod 394, and the linkage member 392 is drivenly connected to the second engaging member 350 through the linkage rod 394. Furthermore, the limiting mechanism 300 may also include a second resetting member 393. The second resetting member 393 abuts against the linkage member 392 and the extension seat 120. When the second body 200 rotates to a forward orientation, the pushing rib 391 pushes the linkage member 392 to move, causing the linkage member 392 to drive the second engaging member 350 to rotate to the engaged position; the second resetting member 393 is adapted to push the linkage member 392, causing the linkage member 392 to drive the second engaging member 350 to rotate to the disengaged position.

[0169] Specifically, as shown in Figures 21 and 22, the second body 200 includes a second housing assembly (not labeled). In this embodiment, the second housing assembly includes a third housing 203 and a fourth housing 204 that are interlocked. The third housing 203 and the fourth housing 204 are interlocked to enclose and form a hollow second receiving cavity 2210. A portion of the third housing 203 forms the front back cover 2211 of the backrest portion 220, and another portion of the third housing 203 forms the upper seat cover 211 of the seat portion 210 (see Figure 1). A portion of the fourth housing 204 forms the rear back cover 2212 of the backrest portion 220, a portion of the fourth housing 204 forms the outer cover 2011 of the rotating chassis 201, and another portion of the fourth housing 204 forms the bottom seat cover 212 of the seat portion 210. That is, the interiors of the backrest portion 220, the seat portion 210, and the rotating chassis 201 are connected through the second receiving cavity 2210. In this embodiment, the third housing 203 and the fourth housing 204 are each integrally formed structures. In other embodiments, the third housing 203 and the fourth housing 204 may also be formed by connecting different independent parts through snap-fitting, fusion welding or welding.

[0170] The portion of the housing assembly forming the backrest 220 will be described in detail below with reference to Figures 21 and 22. The backrest cover 2212 has a locking opening 2212a communicating with the receiving cavity 2210. The backrest 220 includes a support frame 222. The support frame 222 includes a mounting tube 2221, which is disposed within the receiving cavity 2210 along the left-right direction of the backrest 220. For example, the mounting tube 2221 can be fixed to the front backrest cover 2211 by fasteners such as screws at approximately the middle of its left-right direction. A first locking member 340 is at least partially located outside the receiving cavity 1210. One end of the first locking member 340 extends into the receiving cavity 2210 through the locking opening 2212a and connects to the mounting tube 2221. The other end of the first locking member 340 is located outside the receiving cavity 1210 and extends obliquely relative to the backrest cover 2212, bending upwards away from the backrest cover 2212 to form a hook 341. The pushing rib 391 extends approximately along the left-right direction of the backrest portion 220 and is located above the first engaging member 340. In this embodiment, the pushing rib 391 includes two pushing half-ribs 3912, which are spaced apart along the left-right direction of the backrest cover 2212. A fastening hole 205 for assembling and disassembling the backrest cover 2212 is provided in the middle of the two pushing ribs 391. Alternating inclined surfaces 3911 are also formed at the mutually distant ends of the two pushing ribs 391. In other embodiments, the pushing rib 391 can also be a single-piece, complete rib structure, in which case the two alternating inclined surfaces 3911 are respectively provided at the left and right ends of the pushing rib 391. Specifically, as shown in Figures 23 and 24, the extension front cover 1211 of the extension seat 120 is provided with a first connecting groove 1202 and a second connecting groove 1203. The first connecting groove 1202 is located above the second connecting groove 1203. The first connecting groove 1202 is used to expose the linkage 392, and the first connecting groove 1202 is a strip-shaped groove arranged approximately along the left and right direction of the extension seat 120. The second connecting groove 1203 is used to allow the second engaging member 350 to extend, and the second connecting groove 1203 is a "U"-shaped groove arranged approximately along the left and right direction of the extension seat 120. Specifically, as shown in Figures 25 and 26, at least part of the second engaging member 350, the linkage 392, the second resetting member 393, and the linkage rod 394 are all disposed in the mounting cavity 1210 of the extension seat 120. The second engaging member 350 includes an engaging rod 351, two U-shaped rods 352, two side rods 353, and two connecting rods 354. In this embodiment, the two connecting rods 354 of the second engaging member 350 are pivotally connected to two fixed tubes 1223 so that the second engaging member 350 can rotate between the engaging position and the disengaged position. Furthermore, in this embodiment, the engaging rod 351 of the second engaging member 350 is located below the two connecting rods 354, so that when the first engaging member 340 and the second engaging member 350 are engaged, the relative positions of the hook portion 341 and the connecting rod 354 are corresponding. Specifically, in this embodiment, when the first engaging member 340 and the second engaging member 350 are engaged, the connecting rod 354 is located above the hook portion 341.In other embodiments, the engaging rod 351 may be located above the two connecting rods 354 or at other positions, and / or the linkage 392 may be located below the second engaging member 350 or at other positions. Correspondingly, the first connecting groove 1202 may be located below the second connecting groove 1203 or at other positions.

[0171] Specifically, as shown in Figures 25 and 26, the linkage 392 is movably disposed within the mounting cavity 1210. In this embodiment, the position of the linkage 392 corresponds to the position of the first connecting groove 1202. When the linkage 392 is not pushed, it is approximately flush with the opening of the first connecting groove 1202. The pushing rib 391 extends into the mounting cavity 1210 through the first connecting groove 1202 to push the linkage 392. In this embodiment, the linkage 392 is approximately elongated. Furthermore, there are two linkage rods 394, which are respectively connected to the left and right sides of the second engaging member 350. One end of each linkage rod 394 is connected to both ends of the linkage 392, and the other end of each linkage rod 394 is connected to the two connecting rods 354 of the second engaging member 350. Thus, when the linkage 392 is pushed and moved by the push rib 391, the linkage 392 drives the second engaging member 350 to rotate between the engaging position (see Figure 25) and the disengaged position (see Figure 26) via the linkage rod 394. In an embodiment not shown, the linkage 392 may also be configured to at least partially protrude from the first communicating groove 1202, the push rib 391 being adapted to push against the linkage 392, and the linkage 392 being retractable within the first communicating groove 1202.

[0172] Specifically, as shown in Figure 26, there are two second reset members 393 arranged at intervals, and the two second reset members 393 are used to push against the left and right sides of the linkage member 392, respectively. In this embodiment, both second reset members 393 are springs. Taking one of the second reset members 393 as an example, the inner side of the extended rear cover 1212 is provided with a roughly annular mounting seat 1212a. The mounting seat 1212a has a first receiving groove 1212b, and the linkage member 392 is provided with a second receiving groove 3920 at a position opposite to the first receiving groove 1212b. One end of the second reset member 393 is disposed in the first receiving groove 1212b and abuts against the bottom of the first receiving groove 1212b, and the other end of the second reset member 393 is disposed in the second receiving groove 3920 and abuts against the bottom of the second receiving groove 3920. This arrangement can prevent the second reset member 393 from shifting during deformation.

[0173] Please refer to Figures 20 and 24 to 26. As the second body 200 rotates relative to the first body 100 to face forward, the pushing rib 391 on the backrest 220 gradually rotates into the first connecting groove 1202. The avoidance slopes 3911 at both ends of the pushing rib 391 help guide the pushing rib 391 to gradually abut against the linkage 392 as the second body 200 rotates. During the process of the pushing rib 391 rotating into the first connecting groove 1202, it will continuously push against the linkage 392 in the mounting cavity 1210, causing the linkage 392 to move towards the extended rear cover 1212 (i.e., the rear in Figure 26). The linkage 392 then drives the second engaging member 350 to rotate clockwise (i.e., the D1 direction in Figure 26) around the connecting rods 354 on both sides via two linkage rods 394. At this time, the two second reset members 393 are compressed and deformed. The setting position of the second engaging member 350 corresponds to the setting position of the second connecting groove 1203. When the second engaging member 350 rotates from the disengaged position to the engaged position, the engaging rod 351 of the second engaging member 350 extends out of the mounting cavity 1210 through the second connecting groove 1203 and engages with the hook 341 of the first engaging member 340. This prevents the second body 200 from tilting forward relative to the first body 100 in the event of a sudden impact to the child safety seat. As the second body 200 continues to rotate relative to the first body 100 or rotates in the opposite direction, it rotates relative to the first body 100 to, for example, a rearward orientation. During the process of the pushing rib 391 rotating out of the first connecting groove 1202, the pushing force of the pushing rib 391 on the linkage member 392 gradually decreases, causing the linkage member 392 to gradually return to its forward position as shown in Figure 26 under the elastic restoring force of the second reset member 393. This causes the linkage member 392 to drive the second engaging member 350 to rotate in the opposite direction along the D1 direction around the connecting rods 354 on both sides via the two linkage rods 394. When the pushing rib 391 is completely removed from the first connecting groove 1202, the pushing rib 391 does not push against the linkage 392, the second engaging member 350 returns to the separated position, and the engaging rod 351 of the second engaging member 350 retracts into the mounting cavity 1210 through the second connecting groove 1203 to separate from the hook 341 of the first engaging member 340.

[0174] In this embodiment, as shown in Figures 23 and 24, the extended front cover 1211 may include a main cover 1211b and an edge cover 1211c connected to the edge of the main cover 1211b. The edge cover 1211c is inclined relative to the main cover 1211b, specifically, the edge cover 1211c can be gradually inclined backward in a direction away from the main cover 1211b. The left and right ends of the first connecting groove 1202 also extend from the main cover 1211b to the left and right edge covers 1211c on the left and right sides, respectively. This arrangement is equivalent to the left and right ends of the first connecting groove 1202 penetrating through the left and right sides of the main cover 1211b, thus forming a through opening between the left and right sides of the main cover 1211b and the edge cover 1211c. This arrangement allows the pushing rib 391 to rotate more smoothly into the first connecting groove 1202.

[0175] Of course, in other embodiments, the positions of the first engaging member 340, the second engaging member 350, the pushing rib 391, the linkage member 392, the second resetting member 393, and the linkage rod 394 can also be adjusted as needed. For example, the first engaging member 340 and the pushing rib 391 can be disposed on the front of the extension seat 120 (which can also be understood as extending the front cover 1211), while the second engaging member 350, the linkage member 392, the second resetting member 393, and the linkage rod 394 can be disposed within the receiving cavity 2210 of the backrest portion 220, etc. This application does not impose any limitations on this.

[0176] Fifth embodiment

[0177] As shown in Figures 27 to 30, the fifth embodiment of this application proposes a child safety seat. This child safety seat includes a first body 100, a second body 200, and a limiting mechanism 300. The structure and connection relationship of the first body 100 and the second body 200 in this embodiment are largely the same as those in the first embodiment, and will not be repeated here. The main difference between the child safety seat in this embodiment and the child safety seat in the first embodiment lies in the limiting mechanism 300.

[0178] As shown in Figures 27 to 30, the limiting mechanism 300 in this embodiment includes a first locking member 340 and a second locking member 350. Optionally, there are at least two second locking members 350, and at least two first locking members 340, each corresponding to one of the at least two second locking members 350. Optionally, there are at least three second locking members 350, and at least three first locking members 340, each corresponding to one of the at least three second locking members 350. The at least three second locking members 350 are distributed at at least two heights in the vertical direction of the extension seat 120. In this embodiment, there are three second locking members 350, and three first locking members 340, each corresponding to one of the three second locking members 350. Three second locking components 350 are all located on the front of the extension base 120, and three first locking components 340 are all located on the back of the second body 200. When the second body 200 rotates relative to the first body 100 to face forward, the three second locking components 350 connect and engage with the three first locking components 340 respectively. One of the first locking components 340 is located above the other two first locking components 340. Specifically, the upper first locking component 340 is located on the opposite upper side of the back of the backrest 220, and the two lower first locking components 340 are located on the back of the rotating base 201. The two lower first locking components 340 are inclined relative to the upper first locking component 340.

[0179] The three first latching components 340 have roughly the same structure. Taking the upper first latching component 340 as an example, the first latching component 340 is roughly L-shaped and includes a first fixing part 342 and a first inserting part 343 connected to each other. The end of the first fixing part 342 away from the first inserting part 343 is connected to the back of the backing part 220. The first inserting part 343 extends upward from the other end of the first fixing part 342, and the first inserting part 343 and the back of the backing part 220 form a first slot 344. Of course, in other embodiments, the first inserting part 343 may also extend downward from the other end of the first fixing part 342.

[0180] As shown in Figures 34 to 36, all three second latching members 350 are disposed on the front side of the extension base 120. In this embodiment, the three second latching members 350 are respectively distributed at a first height position and a second height position of the extension base 120, with the first height position located above the second height position. Two of the second latching members 350 are located at the same height in the vertical direction of the extension base 120. Further, in this embodiment, one second latching member 350 is located at the first height position of the extension base 120, and the other two second latching members 350 are located at the second height position of the extension base 120. That is, one second latching member 350 is located above the other two second latching members 350. More specifically, the first height position is the top of the front side of the extension base 120, so that one of the three second latching members 350 is located at the top of the front side of the extension base 120, which can more effectively prevent the second body 200 from tipping forward; of course, the first height position can also be any other position below the top of the front side of the extension base. Specifically, the upper second engaging member 350 is connected to the upper side of the front of the extension seat 120 (which can also be understood as connected to the extension front cover 1211), and the two lower second engaging members 350 are connected to the lower side of the front of the extension seat 120 (which can also be understood as connected to the extension front cover 1211), for example, specifically located at the edge of the mounting groove 111 for mounting the rotating chassis 201. In this embodiment, the two lower second engaging members 350 partially extend into the mounting groove 111, thereby adapting to the two first engaging members 340 provided on the back of the rotating chassis 201. In this embodiment, since the extension front cover 1211 located on the front of the extension seat 120 is inclined relative to the bottom surface of the seat portion 210, the mounting groove 111 provided on the base 110 also has its groove wall inclined upward according to the shape of the extension front cover 1211 near the extension seat 120. The depth of the mounting groove 111 gradually changes from deeper at the back to shallower at the front, and the edges of the mounting groove 111 also gradually change from lower at the front to higher at the back. The two lower second latching pieces 350 are also inclined relative to the upper second latching piece 350, and correspondingly, the two lower first latching pieces 340 are inclined relative to the upper first latching piece 340. As shown in the top view of Figure 36, due to the inclination of the extended front cover 1222, the upper second latching piece 350 is located behind the two lower second latching pieces 350.

[0181] As shown in Figures 34 to 36, the geometric centers of the three second snap-fit ​​components 350 are arranged to form the three vertices of a virtual triangle. That is, the virtual lines connecting the geometric centers of the three second snap-fit ​​components 350 roughly form a virtual triangle, and the three vertices of the virtual triangle are denoted as X1, Y1, and Z1 as shown in Figure 36. In this embodiment, the virtual triangle is an isosceles triangle, with its vertex located above its two base angles. Specifically, the geometric centers of the two lower second snap-fit ​​components 350 are located at the two base angles of the virtual triangle, while the geometric center of the upper second snap-fit ​​component 350 is located at the vertex angle of the triangle. The two lower second snap-fit ​​components 350 are symmetrically arranged about the line containing the height H1 of the isosceles triangle, and the upper second snap-fit ​​component 350 is positioned on the line containing the height H1 of the isosceles triangle, with the vertex of the isosceles triangle based on the geometric center of the upper second snap-fit ​​component 350. In this embodiment, the median Q1 of the isosceles triangle (in this embodiment, the median Q1 coincides with the height H1) and the center O1 of the mounting groove 111 lie in the same vertical plane S1, and the entire housing assembly is symmetrical with respect to this vertical plane S1. Correspondingly, the three first engaging members 340 also have such a positional relationship.

[0182] Furthermore, as shown in Figures 35 and 36, the angle of the vertex angle of the virtual triangle (i.e., θ2) can be greater than, less than, or equal to the angle of its base angle (i.e., θ1). Preferably, the angle of the vertex angle of the virtual triangle (i.e., θ2) is less than or equal to the angle of its base angle (i.e., θ1). With this setting, the distance between the two height positions of the three second locking members 350 can be greater, that is, the distance between the first height position and the second height position is greater. The second body 200 is, for example, a non-carrying child safety seat (as shown in Figures 27 to 33). When the second body 200 is rotated relative to the first body 100 to face forward, the three second locking members 350 can connect and cooperate with the first locking member 340 of the second body 200 over a larger distance range, more effectively restricting the second body 200 from tipping forward.

[0183] Optionally, in some unillustrated embodiments, the angle of the vertex angle (i.e., θ2) of the virtual triangle is greater than the angle of its base angle (i.e., θ1). With this configuration, the spacing between the two height positions of the three second latching members 350 can be smaller, that is, the spacing between the first height position and the second height position is smaller. For example, the second latching member 350 located at the first height position is positioned at the top of the front of the extension base 120, and the two second latching members 350 located at the second height position are positioned approximately at the middle height of the front of the extension base 120. In some embodiments, all three first latching members 340 of the second body 200 may be located on the back of the second body 200. When the second body 200 is facing forward relative to the first body 100, the three second latching members 350 engage with the three first latching members 340 to prevent the second body 200 from tipping forward. In other embodiments, the preset direction includes forward and backward directions. One of the first engaging members 340 of the second body 200 may be located on the back of the second body 200, while the other two first engaging members 340 are located at the front of the seat portion 210 of the second body 200. When the second body 200 is facing forward relative to the first body 100, the second engaging member 350 at a first height position engages with one of the first engaging members 340 to prevent the second body 200 from tipping forward. When the second body 200 is facing backward relative to the first body 100, the two second engaging members 350 at a second height position engage with the two first engaging members 340 to prevent the second body 200 from tipping forward.

[0184] In some other embodiments, the first body 100 can be adapted to different types of second bodies, such as a first type of second body and a second type of second body. For example, the first type of second body is a non-carrier type second body (e.g., the second body of a Harness child safety seat), and the second type of second body is a carrier type second body (which may be called an infant carrier, not shown in the figures). When the first body 100 is adapted to the first type of second body, the first engaging member 340 of the first type of second body is located on the back of the first type of second body. When the first type of second body is rotated relative to the first body to face forward, the second engaging member 350 located at a first height position engages with the first engaging member 340 to prevent the first type of second body from tipping forward. When the first body 100 is adapted to the second type of second body, the first engaging member 340 of the second type of second body is located in the front position of the seat part of the second type of second body. When the first type of second body is rotated relative to the first body to face backward, the first engaging member 340 of the second type of second body is close to the front of the first body. The second engaging member 350 located at the second height position is connected and engaged with the first engaging member 340 of the second type of second body to prevent the second type of second body from tipping forward.

[0185] Please refer to Figures 31 to 33. The three second latching components 350 have roughly the same structure. Taking the upper second latching component 350 as an example, the second latching component 350 is roughly L-shaped, including a second fixing part 355 and a second insertion part 356 connected to each other. The end of the second fixing part 355 away from the second insertion part 356 is connected to the back of the backing part 220. The second insertion part 356 extends downward from the other end of the second fixing part 355, and the second insertion part 356 and the extended front cover 1211 form a second slot 357. Of course, in other embodiments, the second insertion part 356 may also extend upward from the other end of the second fixing part 355.

[0186] As shown in Figures 32 and 33, when the second body 200 rotates relative to the first body 100 to face forward, the three first engaging members 340 rotate to engage with the corresponding three second engaging members 350. Specifically, the first insertion portion 343 of each first engaging member 340 is inserted into the second slot 357 of the corresponding second engaging member 350, and the second insertion portion 356 of each second engaging member 350 is inserted into the first slot 344 of the corresponding first engaging member 340. This prevents the second body 200 from tilting forward relative to the first body 100 in the event of a sudden impact to the child safety seat. When the second body 200 needs to continue rotating relative to the first body 100 or rotate in the opposite direction, for example, to a rearward position, the three first locking members 340 rotate to disengage from the three second locking members 350. That is, the first insertion part 343 of each first locking member 340 rotates out of the second slot 357 of the corresponding second locking member 350, and the second insertion part 356 of each second locking member 350 rotates out of the first slot 344 of the corresponding first locking member 340, thereby releasing the restriction between the extension seat 120 and the backrest 220.

[0187] In other embodiments, the two lower second latching members 350 may also be disposed on the lower side of the extension seat 120 but not in the mounting groove 111. In this case, the two lower second latching members 350 may be disposed on the opposite lower side of the backrest 220 instead of on the rotating chassis 201.

[0188] Sixth Embodiment

[0189] As shown in Figures 38 and 39, the sixth embodiment of this application proposes a child safety seat. This child safety seat includes a first body 100, a second body 200, and a limiting mechanism 300. The structure and connection relationship of the first body 100 and the second body 200 in this embodiment are largely the same as those in the fifth embodiment, and will not be repeated here. The main difference between the child safety seat in this embodiment and the child safety seat in the fifth embodiment lies in the limiting mechanism 300.

[0190] As shown in FIGS. 40 to 43, similar to the fifth embodiment, the limiting mechanism 300 in this embodiment also includes a first engaging member 340 and a second engaging member 350. There are also three first engaging members 340, and all three first engaging members 340 are provided on the back surface of the second body 200 (which can also be understood as facing the rear cover 2212). Correspondingly, there are also three second engaging members 350, and all three second engaging members 350 are provided on the front surface of the extension base 120 (which can also be understood as the front extension cover 1211). The structures of the first engaging member 340 and the second engaging member 350 in this embodiment are the same as those in the fifth embodiment. The difference between this embodiment and the fifth embodiment is that two of the three first engaging members 340 in this embodiment are located above the other first engaging member 340. Specifically, the two upper first engaging members 340 are spaced apart and disposed on the relatively upper side of the back surface of the backrest portion 220, and the lower first engaging member 340 is disposed on the back surface of the rotary chassis 201. As shown in FIG. 38, the two upper first engaging members 340 are substantially parallel to the lower first engaging member 340. Two of the second engaging members 350 are at the same height in the up and down direction of the extension base 120. Further, in this embodiment, two of the second engaging members 350 are distributed at the first height position of the extension base 120, and the other second engaging member 350 is distributed at the second height position of the extension base 120. That is, two of the second engaging members 350 are located above the other second engaging member 350. Specifically, the two upper second engaging members 350 are disposed on the relatively upper side of the front surface of the extension base 120, and the lower second engaging member 350 is disposed on the relatively lower side of the front surface of the extension base 120. In this embodiment, the lower second engaging member 350 (i.e., the second engaging member 350 at the second height position) is specifically located at the highest point of the edge of the groove wall of the installation groove 111 for installing the rotary chassis 201. The lower second engaging member 350 is substantially parallel to the two upper second engaging members 350.

[0191] As shown in Figures 42 and 43, the geometric centers of the three second snap-fit ​​components 350 are arranged to form the three vertices of a virtual triangle. That is, the virtual lines connecting the geometric centers of the three second snap-fit ​​components 350 roughly form a virtual triangle, and the three vertices of the virtual triangle are denoted as X2, Y2, and Z2 as shown in Figure 43. In this embodiment, the virtual triangle is an inverted isosceles triangle. Specifically, the geometric centers of the two second snap-fit ​​components 350 located at the first height are located at the two base angles of the triangle (denoted as X2 and Y2 in Figure 43), and the geometric center of the second snap-fit ​​component 350 located at the second height is located at the apex angle of the triangle (denoted as Z2 in Figure 43). The two lower second snap-fit ​​components 350 are symmetrically arranged about the line containing the height H2 of the isosceles triangle. The lower second snap-fit ​​component 350 is positioned on the line containing the height H2 of the isosceles triangle, and the vertices of the isosceles triangle are referenced to the geometric centers of the lower second snap-fit ​​components 350. In this embodiment, the median Q2 of the isosceles triangle (in this embodiment, the median Q2 coincides with the height H2) and the center O2 of the mounting groove 111 lie in the same vertical plane S2, and the entire housing assembly is symmetrical with respect to this vertical plane S2. Correspondingly, the three first engaging members 340 also have such a positional relationship.

[0192] Furthermore, as shown in Figures 42 and 43, the angle of the vertex angle of the virtual triangle (i.e., θ4) can be greater than, less than, or equal to the angle of its base angle (i.e., θ3). Preferably, the angle of the vertex angle of the virtual triangle (i.e., θ4) is less than or equal to the angle of its base angle (i.e., θ3). With this setting, the distance between the two height positions of the three second locking members 350 can be greater, that is, the distance between the first height position and the second height position is greater. The second body 200 is, for example, a non-carrying child safety seat (as shown in Figures 38 to 40). When the second body 200 is rotated relative to the first body 100 to face forward, the three second locking members 350 can connect and cooperate with the first locking member 340 of the second body 200 over a larger distance range, more effectively restricting the second body 200 from tipping forward.

[0193] Optionally, in some unillustrated embodiments, the angle of the vertex angle (i.e., θ4) of the virtual triangle is greater than the angle of its base angle (i.e., θ3). With this configuration, the spacing between the two height positions of the three second latching members 350 can be smaller, that is, the spacing between the first height position and the second height position is smaller. For example, the two second latching members 350 located at the first height position are positioned near the top of the front surface of the extension base 120, and the second latching member 350 located at the second height position is positioned approximately at the middle height of the front surface of the extension base 120. In some embodiments, all three first latching members 340 of the second body 200 may be located on the back surface of the second body 200. When the second body 200 is facing forward relative to the first body 100, the three second latching members 350 engage with the three first latching members 340 to prevent the second body 200 from tipping forward. In other embodiments, the preset direction includes forward and backward directions. Two of the first engaging members 340 of the second body 200 may be located on the back of the second body 200, and the other first engaging member 340 may be located at the front of the seat portion 210 of the second body 200. When the second body 200 is facing forward relative to the first body 100, the two second engaging members 350 at a first height position are connected and engaged with the two first engaging members 340 to prevent the second body 200 from tipping forward. When the second body 200 is facing backward relative to the first body 100, the second engaging member 350 at a second height position is connected and engaged with one first engaging member 340 to prevent the second body 200 from tipping forward.

[0194] In some other embodiments, the first body 100 can be adapted to different types of second bodies, such as a first type of second body and a second type of second body. For example, the first type of second body is a non-carrier type second body (e.g., the second body of a Harness child safety seat), and the second type of second body is a carrier type second body (which may be called an infant carrier, not shown in the figures). When the first body 100 is adapted to the first type of second body, both first latching pieces 340 of the first type of second body are located on the back of the first type of second body. When the first type of second body is rotated relative to the first body to face forward, the two second latching pieces 350 located at a first height position are connected and engaged with the two first latching pieces 340 of the first type of second body to prevent the first type of second body from tipping forward. When the first body 100 is adapted to the second type of second body, another first engagement piece 340 of the second type of second body is located in the front position of the seat part of the second type of second body. When the first type of second body is rotated relative to the first body to face backward, the first engagement piece 340 of the second type of second body is close to the front of the first body. The second engagement piece 350 located at the second height position is connected and engaged with the first engagement piece 340 of the second type of second body to prevent the second type of second body from tipping forward.

[0195] It should be noted that the engagement and disengagement processes of the first engaging component 340 and the second engaging component 350 in this embodiment are similar to those in the fifth embodiment, and will not be repeated here.

[0196] Seventh Embodiment

[0197] As shown in Figures 44 to 47, the seventh embodiment of this application proposes a child safety seat. This child safety seat includes a first body 100, a second body 200, and a limiting mechanism 300. The structure and connection relationship of the first body 100 and the second body 200 in this embodiment are largely the same as those in the fifth embodiment, and will not be repeated here. The main difference between the child safety seat in this embodiment and the child safety seat in the fifth embodiment lies in the limiting mechanism 300.

[0198] As shown in Figures 48 and 49, similar to the fifth embodiment, the limiting mechanism 300 in this embodiment also includes a first engaging member 340 and a second engaging member 350. There is one of each of the first engaging member 340 and the second engaging member 350; in other embodiments, there may be two or more of the first engaging member 340 and the second engaging member 350. The first engaging member 340 is disposed approximately in the middle of the back of the backrest portion 220. The structure of the first engaging member 340 in this embodiment is similar to that in the fifth embodiment, also being an "L"-shaped structure, including a first fixing part 342 and a first inserting part 343 connected to each other. One end of the first fixing part 342 away from the first inserting part 343 is disposed on the back of the backrest portion 220. The first inserting part 343 extends upward from the other end of the first fixing part 342, forming a first slot 344 with the back of the backrest portion 220. Of course, in other embodiments, the first inserting part 343 may also extend downward from the other end of the first fixing part 342.

[0199] The difference between the limiting mechanism 300 in this embodiment and the limiting mechanism 300 in the fifth embodiment lies in the structure of the second engaging member 350. In this embodiment, as shown in Figures 50 to 52, the front of the extension seat 120, or the extension front cover 1211 of the extension seat 120, can be recessed rearward to form an engaging groove 1204, which extends along the left-right direction of the extension seat 120. A second engaging member 350 protrudes from one side of the groove wall of the engaging groove 1204, forming a second slot 357 between the second engaging member 350 and the bottom of the engaging groove 1204. It can be understood that the second slot 357 is part of the engaging groove 1204. In this embodiment, the second engaging member 350 protrudes downward from the upper side groove wall of the engaging groove 1204. In other embodiments, the second engaging member 350 protrudes upward from the lower side groove wall at the bottom of the engaging groove 1204, or protrudes from a side groove wall in other directions. In this embodiment, the second engaging member 350 is located approximately in the middle of the engaging groove 1204. The engaging groove 1204 extends through the left and right sides of the extension seat 120, and the engaging groove 1204 also forms clearance grooves 1204a on both sides of the second engaging member 350. The width of the clearance grooves 1204a is greater than the protruding length of the second engaging member 350. That is, in this embodiment, the second engaging member 350 extends downward from the upper side wall of the engaging groove 1204, and the width of the clearance grooves 1204a is greater than the distance from the extension end (i.e., the lower end) of the second engaging member 350 to the lower side wall of the engaging groove 1204. Alternatively, the second engaging member 350 extends upward from the lower side wall of the engaging groove 1204, and the width of the clearance grooves 1204a is greater than the distance from the extension end (i.e., the upper end) of the second engaging member 350 to the upper side wall of the engaging groove 1204. In this embodiment, the first engaging member 340 engages with the second engaging member 350 formed by extending from one side of the engaging groove 1204 of the extension seat 120, and the engaging groove 1204 is formed by the extension front cover 1211 itself being recessed backward, making the connection structure between the first body 100 and the second body 200 more compact.

[0200] Please refer to Figures 44 to 47. During the process of the second body 200 rotating relative to the first body 100 to face forward, the first engaging member 340 first rotates from one side of the engaging groove 1204 into the corresponding side of the clearance groove 1204a. Then, when the second body 200 rotates relative to the first body 100 to face forward, the first inserting part 343 of the first engaging member 340 is inserted into the second slot 357. At this time, the second engaging member 350 is inserted into the first slot 344, that is, the first engaging member 340 and the second engaging member 350 engage with each other to form a limit. In this way, the second body 200 can be prevented from tilting forward relative to the first body 100 when the child safety seat is subjected to a sudden impact. When the second body 200 needs to continue rotating relative to the first body 100 or rotate back to, for example, a rearward position, the first engaging member 340 rotates to the clearance groove 1204a on the other side or the clearance groove 1204a on one side and rotates out from the corresponding side of the engaging groove 1204. The first engaging member 340 and the second engaging member 350 are disengaged, thereby releasing the restriction between the extension seat 120 and the backrest 220.

[0201] Of course, in other embodiments, the positions of the first latching member 340, the second latching member 350, and the latching groove 1204 can be adjusted as needed. For example, the first latching member 340 can be disposed on the front side of the extension base 120 (which can be understood as extending the front cover 1211), while the second latching member 350 and the latching groove 1204 can be disposed on the back side of the backrest 220 (which can be understood as backresting the rear cover 2212), etc. This application does not limit this.

[0202] Eighth embodiment

[0203] As shown in Figures 53 to 56, the eighth embodiment of this application proposes a child safety seat. This child safety seat includes a first body 100, a second body 200, and a limiting mechanism 300. The structure and connection relationship of the first body 100 and the second body 200 in this embodiment are largely the same as those in the first embodiment, and will not be repeated here. The main difference between the child safety seat in this embodiment and the child safety seat in the fifth embodiment lies in the limiting mechanism 300.

[0204] As shown in Figures 57 to 59, the limiting mechanism 300 in this embodiment includes a first engaging member 340 disposed on the backrest portion 220 of the second body 200 and a second engaging member 350 disposed on the extension seat 120 of the first body 100. In this embodiment, the first engaging member 340 has a hook-shaped structure, and the second engaging member 350 has a groove-shaped structure. The second engaging member 350, which can be referred to as the insertion groove 350, is disposed on the extension seat 120. When the second body 200 rotates to face forward, the first engaging member 340 engages with the insertion groove 350. Specifically, as shown in Figure 58, the first engaging member 340 has an "L"-shaped structure, including a first fixing portion 342 and a first insertion portion 343 connected to each other. The end of the first fixing portion 342 away from the first insertion portion 343 is disposed on the opposite upper side of the back of the backrest portion 220, and the first insertion portion 343 extends downward from the end of the first fixing portion 342 away from the second body 200. As shown in Figures 59 to 62, the insertion slot 350 is formed at the top of the extension base 120 and extends through the left and right sides of the extension base 120. When the second body 200 rotates relative to the first body 100 to face forward, the first insertion part 343 is inserted into the insertion slot 350. In this embodiment, the first insertion part 343 is inserted into the insertion slot 350 directly formed at the top of the extension base 120, without the need for additional components to extend outward from the extension base 120 to engage with the first engaging member 340, making the connection structure between the first body 100 and the second body 200 more compact.

[0205] Please refer to Figures 57 and 58. During the rotation of the second body 200 relative to the first body 100 to a forward-facing position, the first insertion portion 343 of the first engaging member 340 enters the insertion groove 350 through a through-hole on one side and forms a limit with the front wall of the insertion groove 350. This prevents the second body 200 from tilting forward relative to the first body 100 in the event of a sudden impact to the child safety seat. When it is necessary for the second body 200 to continue rotating relative to the first body 100 or to rotate back to, for example, a rearward position, the first insertion portion 343 of the first engaging member 340 exits the insertion groove 350 through a through-hole on the other side or the same side. The first insertion portion 343 of the first engaging member 340 is released from the limit with the front wall of the insertion groove 350, thereby releasing the limit between the extension seat 120 and the backrest 220.

[0206] In this embodiment, the top of the backrest 220 is higher than the top of the extension base 120. Therefore, a first engaging member 340 is provided on the upper side of the backrest 220 to engage and limit the insertion slot 350 at the top of the extension base 120. In other embodiments, the top of the extension base 120 may be higher than the top of the backrest 220 or the top of the extension base 120 may be at the same height as the top of the backrest 220. In this case, the first engaging member 340 may be provided on the upper side of the extension base 120, and the insertion slot 350 may be provided on the top of the backrest 220. Thus, the first insertion portion 343 of the first engaging member 340 may be inserted into the insertion slot 350 to form a limit.

[0207] The child safety seat proposed in this application has at least the following technical effects:

[0208] In the aforementioned child safety seat, a limiting mechanism 300 is provided between the extension seat 120 of the first body 100 and the second body 200. This allows the extension seat 120 and the second body 200 to engage when the second body 200 is facing a preset direction relative to the first body 100, effectively preventing the second body 200 from tipping over relative to the first body 100. The limiting mechanism 300 has a simple structure and is easy to manufacture, process, and assemble.

[0209] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0210] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

A child safety seat, characterized in that, include: The first body includes a base and an extension extending upward from the base; The second body is rotatably disposed on the base and can be oriented in a preset direction relative to the first body; and A limiting mechanism is provided between the first body and the second body; When the second body is oriented toward the preset direction relative to the first body, the extension seat and the second body are adapted to cooperate through the limiting mechanism to prevent the second body from tipping over relative to the first body. The child safety seat according to claim 1 is characterized in that, The limiting mechanism includes: A limiting pin includes a rod portion and a limiting portion connected to each other, wherein one end of the rod portion away from the limiting portion is connected to the second body or the extension seat at a first connection point; and A limiting hole is provided on the extension seat or the second body; When the second body rotates relative to the first body to face the preset direction, the rod portion is adapted to be engaged in the limiting hole, and the limiting portion is limited to the side of the limiting hole facing away from the first connection point. The child safety seat according to claim 2 is characterized in that, The limiting mechanism further includes: The first limiting gear and the second limiting gear are rotatably disposed on the extension seat or the second body, and the first limiting gear and the second limiting gear partially overlap to form the limiting hole; During the process of the second body rotating relative to the first body to face the preset direction, the rod is adapted to push the first limiting gear and the second limiting gear to rotate so as to engage with the limiting hole formed between the first limiting gear and the second limiting gear. The child safety seat according to claim 3 is characterized in that, The first limiting gear is located above and behind the second limiting gear, and the first limiting gear and the second limiting gear partially overlap in the front-back direction to form the limiting hole. The child safety seat according to claim 3 is characterized in that, The extension seat includes an extension housing, which has a mounting cavity and an opening slot communicating with the mounting cavity. The first limiting gear and the second limiting gear are both located in the mounting cavity and are pivotally connected to the extension housing at a first pivot point and a second pivot point, respectively. The rod is connected to the second body at a first connection point. The first pivot point and the second pivot point are located on both sides of the opening slot. During the process of the second body rotating relative to the first body to face the preset direction, the limiting part extends into the mounting cavity through the opening slot. The child safety seat according to claim 5 is characterized in that, The opening groove extends in the left-right direction of the extension seat. The opening groove includes a first groove portion and two second groove portions located at both ends of the first groove portion. The width of the two second groove portions is greater than the width of the first groove portion, and the width of the second groove portion is greater than the maximum width of the limiting portion. The child safety seat according to claim 3 is characterized in that, The limiting part is hemispherical, including a hemispherical surface and a circular surface that are connected to each other, and the circular surface is connected to the rod part. The child safety seat according to claim 1 is characterized in that, The limiting mechanism includes a limiting pin, which includes a rod and a limiting part connected to each other, and the rod is connected between the second body and the limiting part; The extension seat includes an extension housing with a mounting cavity and an opening slot communicating with the mounting cavity. When the second body rotates relative to the first body to face the preset direction, the rod passes through the opening slot, and the inner edge of the opening slot restricts the limiting part from disengaging in a direction away from the first body. The child safety seat according to claim 1 is characterized in that, The limiting mechanism includes: The first card assembly is disposed on the second body; and The second fastener is disposed on the extension seat; When the second body rotates to face the preset direction, the first engaging member engages with the second engaging member. The child safety seat according to claim 9 is characterized in that, The extension seat is provided with a receiving groove, the second engaging member is disposed in the receiving groove, and the limiting mechanism further includes a shielding component, which is used to selectively shield the receiving groove. The child safety seat according to claim 10 is characterized in that, The shielding component includes: The shielding body is movably disposed on the extension base and can be switched between a first position and a second position; and The first reset member abuts between the extension seat and the shielding body respectively; When the shielding body is in the first position, the shielding body shields the receiving groove; when the shielding body is in the second position, the receiving groove is at least partially exposed; the first engaging member is adapted to push the shielding body to move to the second position, and the first resetting member applies force to the shielding body to move it to the first position. The child safety seat according to claim 11 is characterized in that, The shielding body has a clearance groove, the shape of which is adapted to the first engaging member. When the shielding body is in the first position, the shielding body avoids the first engaging member through the clearance groove. The child safety seat according to claim 12 is characterized in that, The extension seat or the second body also includes a guide assembly, at least a portion of the clearance slot is fitted outside the guide assembly, and the shielding body moves along the guide assembly between the first position and the second position. The child safety seat according to claim 9 is characterized in that, There are three second engaging components, all of which are located on the front side of the extension seat. The geometric centers of the three second engaging components are arranged to form the three vertices of a virtual triangle. The child safety seat according to claim 14 is characterized in that, The virtual triangle is an isosceles triangle, and the vertex angle of the isosceles triangle is located above or below its two base angles; and / or, at least one of the three second engaging members is located on top of the front of the extension seat. The child safety seat according to claim 14 is characterized in that, The preset direction is forward. There are three first engaging components, all of which are located on the back of the second body. When the second body rotates relative to the first body to face forward, the three second engaging components are respectively connected and engaged with the three first engaging components. The child safety seat according to claim 16 is characterized in that, The virtual triangle is an isosceles triangle, with one of the second locking components located above the other two second locking components. The vertex angle of the virtual triangle is located above its two base angles, wherein the angle of the vertex angle of the virtual triangle is less than or equal to the angle of its base angles. The child safety seat according to claim 14 is characterized in that, The three second engaging members are respectively distributed at a first height position and a second height position of the extension seat, the first height position being above the second height position, wherein two of the second engaging members are located at the same height of the extension seat in the vertical direction; The preset directions are forward and backward. When the second body rotates relative to the first body to face forward, the second engaging member distributed at the first height position is engaged with the first engaging member of the second body. When the second body rotates relative to the first body to face backward, the second engaging member distributed at the second height position is engaged with the first engaging member of the second body. The child safety seat according to claim 18 is characterized in that, The virtual triangle is an isosceles triangle, with one of the second engagement pieces distributed at a first height position on the extension seat, and the other two second engagement pieces distributed at a second height position on the extension seat. The vertex of the virtual triangle is located above its two base angles. The child safety seat according to claim 19 is characterized in that, The angle of the vertex angle of the virtual triangle is greater than or equal to the angle of its base angle. The child safety seat according to claim 9 is characterized in that, There are at least three second engaging members, all of which are located on the front side of the extension seat. The at least three second engaging members are distributed at at least two heights in the vertical direction of the extension seat. The child safety seat according to claim 9 is characterized in that, The extension seat is recessed to form a locking groove, which is arranged along the left and right direction of the extension seat, and one side wall of the locking groove extends upward or downward to form the second locking member. The child safety seat according to claim 22 is characterized in that, The engaging groove extends through the left and right sides of the extension seat, and the engaging groove has clearance grooves located on both sides of the second engaging member. The child safety seat according to claim 1 is characterized in that, The limiting mechanism further includes a limiting member connected to the second body, the limiting member forming a limiting groove with the second body. When the second body rotates to face the preset direction, the limiting groove engages with the top of the extension seat; or The limiting mechanism further includes a limiting member, which is connected to the extension seat. The limiting member and the second body form a limiting groove. When the second body rotates to face the preset direction, the limiting groove engages with the top of the second body. The child safety seat according to claim 1 is characterized in that, The limiting mechanism includes: A first locking component is disposed in one of the second body and the extension seat; and The second engaging member is rotatably disposed in the other of the extension seat and the second body, and can be switched between an engaging position and a disengaged position. When the second engaging member is in the engaging position, the second engaging member engages with the first engaging member. When the second engaging member is in the disengaged position, the second engaging member disengages from the first engaging member. When the second body rotates to face the preset direction, the second engaging member is in the engaging position. The child safety seat according to claim 25 is characterized in that, The limiting mechanism further includes: A push rib is provided in one of the second body and the extension seat; A linkage component, movably disposed in the other of the second body and the extension seat, the linkage component being drivenly connected to the second engaging component; and The second reset member abuts against the other of the second body and the extension seat and the linkage member; When the second body rotates to face the preset direction, the pushing rib pushes the linkage member to move, so that the linkage member drives the second engaging member to rotate to the engaging position; the second resetting member is adapted to push the linkage member, so that the linkage member drives the second engaging member to rotate to the disengaged position. The child safety seat according to claim 26 is characterized in that, The limiting mechanism further includes: A linkage rod, one end of which is connected to the linkage component, and the other end of which is connected to the second engaging component; When the linkage moves, it drives the second engaging member to rotate between the engaging position and the disengaged position via the linkage rod. The child safety seat according to claim 27 is characterized in that, The extension seat includes: The extended housing has a mounting cavity and a first communicating groove and a second communicating groove communicating with the mounting cavity; The pushing rib is disposed on the second body, and at least a portion of the second engaging member, the linkage member, and the second resetting member are disposed in the mounting cavity. The first engaging member is disposed on the second body. During the process of the second body rotating to face the preset direction, the pushing rib extends into the first connecting groove to push the linkage member or the pushing rib pushes the linkage member that at least partially protrudes from the first connecting groove. The linkage member drives the second engaging member to rotate to the engaging position, so that the second engaging member extends through the second connecting groove to engage with the first engaging member. The child safety seat according to claim 28 is characterized in that, The first connecting groove is arranged along the left and right direction of the extension seat, the pushing rib is arranged along the left and right direction of the second body, and both ends of the pushing rib are provided with avoidance slopes. The child safety seat according to claim 9 is characterized in that, Both the first engaging component and the second engaging component are hook-shaped structures; or, the first engaging component is a hook-shaped structure and the second engaging component is a groove-shaped structure. The child safety seat according to claim 30 is characterized in that, The engaging component has an "L" shaped structure and includes a first fixing part and a first inserting part that are connected to each other. The end of the first fixing part away from the first inserting part is disposed on the back of the second body. The first inserting part extends downward from the end of the first fixing part away from the second body. The second engaging component is opened at the top of the extension seat and passes through the left and right sides of the extension seat. When the second body is rotated to face the preset direction, the first inserting part is inserted into the first fixing part.

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