Child safety seat

Abstract

A child safety seat, comprising a seat shell and a crotch strap assembly. The seat shell comprises a seat portion, wherein the seat portion is provided with a crotch strap adjustment area, the crotch strap adjustment area comprising at least two slot structures spaced apart in the left-right direction. Each of the slot structures comprises at least two crotch strap holes arranged in sequence in the front-back direction, and a communication hole extending in the front-back direction and in communication with the at least two crotch strap holes. The crotch strap assembly comprises a crotch strap buckle and at least two crotch straps. A first end of each crotch strap is fixed below the crotch strap adjustment area, a middle portion of each crotch strap selectively enters any one of the crotch strap holes via the communication hole of the corresponding slot structure, and a second end of each crotch strap is connected to the crotch strap buckle above the crotch strap adjustment area. The seat shell further comprises at least one positioning column located below the crotch strap adjustment area, the positioning column being located on the front side of the crotch strap adjustment area, and the first end of each crotch strap being sleeved on the at least one positioning column.

Description

[0001] The technical field of the child safety seat The present disclosure relates to a child safety seat. BACKGROUND Child safety seats provide convenience and safety for children traveling by car. The child safety seat is provided with a safety belt system, which includes a shoulder belt and a crotch belt matched with each other, and can safely bind the child in the child safety seat. In order to meet the use requirements of children of different sizes, the front and rear positions of the crotch belt can be adjusted. An adjuster can also be provided on the crotch belt, so that the length of the crotch belt can also be adjusted. However, the existing crotch belt adjustment structure is relatively complex and the cost is relatively high. In addition, some child safety seats on the market include a base and a seat capable of adjusting the inclination angle relative to the base, and the inclination angle adjustment mechanism between the seat and the base is relatively complex. CONTENT The first aspect of the present disclosure provides a child safety seat, which comprises a seat shell and a crotch belt assembly. The seat shell comprises a seat part, and the seat part is provided with a crotch belt adjustment area, and the crotch belt adjustment area comprises at least two groove structures arranged in a left-right interval. Each of the groove structures comprises at least two crotch belt holes arranged in a front-rear direction in sequence, and a communication hole extending in the front-rear direction and communicating with the at least two crotch belt holes. The crotch belt assembly comprises a crotch belt buckle and at least two crotch belts. The first end of each crotch belt is fixed below the crotch belt adjustment area, the middle part of each crotch belt selectively enters any of the crotch belt holes through the communication hole of the corresponding groove structure, and the second end of each crotch belt is connected above the crotch belt adjustment area and the crotch belt buckle. The seat shell further comprises at least one positioning column located below the crotch belt adjustment area, the positioning column is located on the front side of the crotch belt adjustment area, and the first end of each crotch belt is sleeved on the at least one positioning column. In the above first aspect, the crotch belt adjustment area is integrally formed with the seat shell. The crotch belt adjustment area is further provided with a reinforcing sheet made of metal and fixed to the seat shell, and the reinforcing sheet has grooves corresponding to the crotch belt holes and the communication hole. In the above first aspect, the lower end of the positioning column is configured to be inclined to the rear side of the crotch belt adjustment area. The seat shell further comprises a seat lower limiting piece fixed to the at least one positioning column, which prevents the first end of the at least two crotch belts from falling off the at least one positioning column. In the above first aspect, the first end of the seat lower limiting piece is fixed to the at least one positioning column, the second end forms an engagement hook which extends outward from the inside of the seat shell; the child safety seat further comprises a base, and the seat shell is pivotally mounted on the base; the base has a base lower limiting piece, and when the seat shell is in the rear position, the base lower limiting piece cooperates with the seat lower limiting piece. In the above first aspect, the seat part is covered with a fabric layer, and the fabric layer is provided with an opening corresponding to the position of the crotch belt adjustment area, and the opening can be covered by a flap.When the cover covers the opening, a gap is formed between the edge of the cover and the fabric layer or the cover itself for the at least two crotch belts to pass through, and the inside of the cover is provided with a hard plate. In the above first aspect, the child safety seat further comprises a base, and the base comprises: a base shell; a support frame accommodated in the base shell, the support frame being in sliding fit with the base shell to change the inclination angle of the seat shell; and a mounting seat fixed to the support frame; the seat shell is rotatably mounted to the mounting seat to be switched to a forward position or a rearward position. The support frame is provided with a base upper limiting piece and a base lower limiting piece, and the seat shell comprises a seat upper limiting piece and a seat lower limiting piece. When the seat shell is in the forward position, the base upper limiting piece cooperates with the seat upper limiting piece of the seat shell. When the seat shell is in the rearward position, the base lower limiting piece cooperates with the seat lower limiting piece of the seat shell. The inside of the base shell is provided with at least two attachment pieces, and the at least two attachment pieces are arranged at intervals in the sliding direction of the support frame. Each of the attachment pieces is provided with an elongated hole, and the support frame is provided with at least two pins, each of the pins being in sliding fit with the corresponding elongated hole. At least one of the attachment pieces is provided with at least two lock holes, the at least two lock holes being arranged at intervals in the sliding direction of the support frame, and the axis of each of the lock holes is parallel to the axis of the pin. The mounting seat is provided with a locking piece, and the locking piece selectively cooperates with the at least two lock holes to lock the inclination angle of the seat shell. The second aspect of the present disclosure provides a child safety seat, comprising: a seat shell; a base comprising a base shell and a mounting seat, the seat shell being rotatably mounted to the mounting seat, the mounting seat being slidably mounted to the base shell in the forward and rearward directions, and the base shell being provided with a plurality of locking portions; a first locking mechanism comprising: a release piece provided on the seat shell; and a driving pin provided on the seat shell;and a locking assembly arranged on the mounting base, the locking assembly comprising a locking member selectively engaged with the plurality of locking portions to lock the sliding of the seat shell. The release member is operatively connected with the driving pin, and the driving pin is operatively connected with the locking assembly to drive the locking member to disengage from the corresponding locking portion. In the second aspect, the seat shell is provided with a third hole, and the driving pin is slidingly fitted in the third hole. The locking assembly comprises a driving block operatively connected with the locking member. The mounting base is provided with a fourth hole, and the driving block is slidingly fitted in the fourth hole. When the seat shell is in the forward position or the rearward position, the third hole is aligned with the fourth hole, and the driving pin is driven to push the driving block to move downward when the release member is subjected to an external release force, and the driving block drives the locking member to disengage from the corresponding locking portion. In the second aspect, the upper end of the driving pin is fixed with a connecting base, and the lower end of the driving pin is used to push the driving block, and the connecting base extends transversely at the upper end of the driving pin. The seat shell can also be provided with a steering wheel below the connecting base. The first locking mechanism further comprises a traction rope, and the first end of the traction rope is operatively connected with the release member, and the second end of the traction rope extends upward after being wound around the steering wheel to be connected with the connecting base. In the second aspect, one of the locking member and the driving block is provided with an inclined hole, and the other of the locking member and the driving block is provided with a connecting pin, and the connecting pin is slidingly fitted in the inclined hole to enable the locking member to engage with or disengage from the locking portion. In the second aspect, the first locking mechanism further comprises at least one of the following: a first reset spring for driving the driving pin to reset; and a second reset spring for driving the locking member to engage with the locking portion. The third aspect of the present disclosure provides a child safety seat, comprising: a seat shell; a base comprising a base shell and a mounting base, the seat shell being rotatably mounted to the mounting base, and the mounting base being slidably mounted to the base shell in a forward and rearward direction; a first locking mechanism for operatively locking the sliding between the mounting base and the base shell; and a second locking mechanism for operatively locking the rotation between the seat shell and the mounting base; wherein the first locking mechanism comprises: a plurality of locking portions arranged on the base shell; and a locking member movably arranged on the mounting base and selectively engaged with the plurality of locking portions to lock the sliding of the seat shell. The second locking mechanism comprises: an engaging portion arranged on the seat shell; and a driving block movably arranged on the mounting base and operatively engaged with the engaging portion.When the driving block is engaged with the engaging portion, the first locking mechanism locks the rotation between the seat shell and the mounting base. The driving block cooperates with the locking member, and when the driving block is disengaged from the engaging portion, the driving block drives the locking member to unlock the locking between the locking member and the locking portion. In the third aspect, the engaging portion is a hole. The second locking mechanism further comprises a driving pin movably arranged in the engaging portion, and a release member arranged on the seat shell and capable of driving the driving pin to move so as to push the driving block to disengage from the engaging portion. In the third aspect, the release member has a first stroke and a second stroke. When the release member moves the first stroke, the driving block disengages from the engaging portion to unlock the rotation between the seat shell and the mounting base. When the release member moves the second stroke, the driving pin extends into the mounting base to lock the sliding between the seat shell and the mounting base, and the driving block drives the locking member to disengage from the locking portion to unlock the sliding between the mounting base and the base shell. The fourth aspect of the present disclosure provides a child safety seat, comprising: a seat shell; a base comprising a base shell and a mounting base, the seat shell being rotatably mounted to the mounting base, and the mounting base being slidably mounted to the base shell; a driving block movably arranged at the mounting base and having a first position and a second position; and a release member arranged at the seat shell and capable of driving the driving block to move between the first position and the second position. When the driving block moves to the first position in a first direction, the rotation between the seat shell and the mounting base is locked, and the sliding between the mounting base and the base shell is locked. When the driving block moves to the second position in a second direction, the sliding between the mounting base and the base shell is unlocked, and the rotation between the seat shell and the mounting base is unlocked. The accompanying drawings, which form a part of the disclosure, are included to provide a further understanding of the disclosure, and are incorporated herein for purposes of illustrating the disclosure. The exemplary embodiments of the present disclosure and their description serve the purpose of explanations and are not intended to limit the disclosure. FIGS. 1-4 show different perspective views of a child safety seat according to a first embodiment of the present disclosure; FIGS. 5 and 6 show exploded views of a base shell and a support frame of the child safety seat shown in FIG. 1; FIG. 7 shows a perspective view of the support frame in FIGS. 5 and 6; FIG. 8 shows a perspective view of the mounting base and the support frame of the child safety seat shown in FIG. 1 assembled together; FIG. 9 shows a perspective view of the base shell of the child safety seat shown in FIG. 1; and FIG. 10 shows a bottom view of the child safety seat shown in FIG. 1 with part of the base shell omitted.Fig. 11 and Fig. 12 show different perspective views of the child safety seat shown in Fig. 1 omitting the base shell; Fig. 13 shows a schematic view of a cross section along the section U2-U2 of Fig. 8; Fig. 14 shows a partial schematic view of a cross section along the section U1-U1 of Fig. 4; Fig. 15 shows a perspective view of the child safety seat in Fig. 1 omitting the crotch belt assembly; Fig. 16 shows an enlarged view of the slot structure at N of the child safety seat shown in Fig. 1 with the crotch belt in the rear crotch belt hole; Fig. 17 and Fig. 18 show bottom views of the seat shell of the child safety seat shown in Fig. 1 from different perspectives, in order to facilitate the illustration of the internal structure of the seat shell, parts of the shell structure of the seat shell are omitted in Fig. 17 and Fig. 18, respectively; Fig. 19 and Fig. 20 show partial structures of the seat shell of the child safety seat shown in Fig. 1, in Fig. 19 the opening in the flap closing fabric layer is closed, in Fig. 20 the opening in the flap closing fabric layer is open; Fig. 21 to Fig. 24 show different variants of the slot structure shown in Fig. 15; Fig. 25 shows a variant of the child safety seat shown in Fig. 19; Fig. 26 to Fig. 28 show side views of a child safety seat according to a second embodiment of the present disclosure in different operating states; Fig. 29 shows a perspective view of the child safety seat shown in Fig. 26 omitting the base shell; Fig. 30 shows a bottom view of the seat shell of the child safety seat shown in Fig. 26; Fig. 31 shows a top view of the mounting base of the child safety seat shown in Fig. 26; Fig. 32 shows a schematic view of a cross section along the section U5-U5 of Fig. 30; Fig. 33 shows a not completely exploded view of the mounting base shown in Fig. 31; Fig. 34 shows a schematic view of a cross section along the section U4-U4 of Fig. 29, Fig. 35 and Fig. 36 show schematic views of a cross section along the section U3-U3 of Fig. 29, Fig. 34 to Fig. 36 show an embodiment of the first locking mechanism; Fig. 37 to Fig. 39 show partial schematic views of a cross section along the section U3-U3 of Fig. 29, Fig. 40 shows a partial schematic view of a cross section along the section U4-U4 of Fig. 29, Fig. 37 to Fig. 40 show a variant embodiment of the first locking mechanism; and Fig. 41 and Fig. 42 show partial schematic views of a cross section along the section U3-U3 of Fig. 29, Fig. 41 and Fig. 42 show another variant embodiment of the first locking mechanism. List of reference signs:

[0002] 1000 child safety seat

[0003] I base

[0004] 10, base housing; 101, upper housing; 1013, attachment; 1013a, first attachment; 1013b, second attachment;

[0005] 1013c, third attachment; 10131, elongated hole; 110, opening; 102, lower housing;

[0006] II, base;

[0007] 12, abutting portion; 1203, opening;

[0008] 13, mounting seat; 1301, upper housing; 1302, lower housing; 1303, hole; 1304, wall body; 13015, fastener; 1300, accommodating cavity; 13010, bottom wall; 13012, bottom wall; 13013, fourth hole; 13021, annular protrusion; 130210, central hole; 13022, bottom wall; 13023, peripheral wall; 13026, slot; 13027, hole; 131a, mounting hole;

[0009] 131, first locking mechanism; 13A, locking assembly; 1310, locking portion; 13109, damping spring; 1311, locking piece; 1312, releasing piece; 1313, traction rope; 13131, first end; 13132, second end; 13133, steering wheel; 1314, return spring; 1315, driving pin; 13151, base; 13152, fixing seat; 1316, return spring; 1317, driving block; 13170, accommodating slot; 13171, inclined hole; 13172, elongated hole; 1318, connecting pin; 1319, return spring;

[0010] 136, handle;

[0011] 139, fastener;

[0012] 19, support frame; 191, longitudinal rod; 1910, sheet material; 19101, first hole; 19102, second hole; 1916, pin; 192, first transverse rod; 192a, mounting hole; 193, second transverse rod; 195, decorative shell; 196, fixing seat; 1961, plate body; 1962, arm body; 19620, hole; 1968, fastener;

[0013] 2, seat housing;

[0014] 21、 seat; 2101, third hole; 21011, L-shaped; 211, crotch adjustment area; 2110, installation groove; 212, slot structure; 2121, crotch hole; 2122, communication hole; 21221, first section; 21222, second section; 2123, protruding part; 213, second locking mechanism; 2131, locking piece; 218, positioning column; 2181, fastener;

[0015] 22、 backrest;

[0016] 23、 headrest;

[0017] 26、 rotation mechanism;

[0018] 275、 reinforcing sheet; 2751, groove;

[0019] 28、 fabric layer; 280, opening; 281, flap; 2811, rear edge; 2810, slot structure; 282, first positioning piece; 283, second positioning piece; 284, hard plate;

[0020] 29、 side impact protection block;

[0021] 311、 base upper limiting piece; 312, seat upper limiting piece; 315, support ring; 321, base lower limiting piece; 322, seat lower limiting piece;

[0022] 4、 top strap; 43, anchor; 45, adjuster;

[0023] 6、 axial limiting piece; 61, disc;

[0024] 7、 safety belt system; 70, crotch belt assembly; 71, crotch belt; 711, first end; 72, crotch belt buckle; 720, L-shaped; 75, shoulder belt buckle; 76, shoulder belt;

[0025] L1, first stroke; L2, second stroke;

[0026] P, direction;

[0027] T1, first distance; T2, second distance; T3, third distance;

[0028] D, thickness; W, width;

[0029] X-X, axis line. Specifically, FIGS. 1 to 4 of the first embodiment show views of the child safety seat 1000 from different perspectives, which is provided according to the first embodiment of the present disclosure. The child safety seat 1000 includes a base 1 for mounting on a vehicle seat and a seat shell 2 mounted to the base 1. The seat shell 2 is pivotable relative to the base 1 so as to have at least a forward position (as shown in FIGS. 1 to 3) and a rearward position (as shown in FIG. 4). When the seat shell 2 is in the forward position, a child seated in the seat shell 2 faces forward of the vehicle. Referring to FIG. 4, when the seat shell 2 is in the rearward position, the child seated in the seat shell 2 faces rearward of the vehicle. At least a portion of the seat shell 2 can be covered with a fabric layer 28 (see FIG. 19) to provide comfort and safety for the child. The seat shell 2 is further provided with a top harness 4 and a harness system 7 (see FIG. 19). The top harness 4 is used to prevent the seat shell 2 from tipping forward in case of sudden stop. The harness system 7 includes a crotch belt assembly 70 and shoulder belts 76, and is used to securely restrain the child in the seat shell 2. It should be noted that in the present embodiment, the orientation terms of “front”, “rear”, “left” and “right” of the seat shell 2 are based on the “front”, “rear”, “left” and “right” of the child seated in the seat shell 2, and the orientation terms of “front”, “rear”, “left” and “right” of the base 1 refer to the “front”, “rear”, “left” and “right” of the vehicle when the base 1 is mounted to the vehicle seat. These orientation terms are only used to make the description of the present embodiment clearer, and do not serve to improperly limit the protection scope of the present disclosure. Specifically, the seat shell 2 in FIG. 1 is in the forward position, at which time the front-to-rear and left-to-right orientations of the seat shell 2 are consistent with those of the base 1. In FIG. 1, the “front” and “rear” directions of the base 1 are schematically shown by arrows F and B, and the “left” and “right” directions of the base 1 are schematically shown by arrows L and R. The seat shell 2 in FIG. 4 is in the rearward position, at which time the front-to-rear and left-to-right orientations of the seat shell 2 are opposite to those of the base 1. The base 1 includes a base shell 10, a support frame 19 (see FIG. 5) and a mounting seat 13. The base shell 10 can include a base portion 11 and an abutting portion 12 extending upwardly from the base portion 11. The base portion 11 is used to be placed on a seat surface of the vehicle seat, and the abutting portion 12 is used to abut against a backrest of the vehicle seat. The support frame 19 is mounted in the base shell 10 and is slidable relative to the base shell 10.Referring to the exploded view of the base shell 10 and the support frame 19 shown in FIG. 5 and FIG. 6, the base shell 10 can include a plurality of rigid shells enclosing the outer shape of the base shell 10, which define an inner space of the base shell 10. In some embodiments, the plurality of rigid shells include, for example, an upper shell 101 corresponding to the front face of the base shell 10 and a lower shell 102 corresponding to the back face of the base shell 10. Of course, the base shell 10 can have other implementations in other embodiments. Most of the structure of the support frame 19 is located in the inner space of the base shell 10, i.e., the support frame 19 is accommodated within the base shell 10. The support frame 19 is in sliding fit with the base shell 10. In some embodiments, the support frame 19 is mainly composed of a plurality of metal tubes connected by welding, screwing, etc., so that the support frame 19 has sufficient structural strength. Referring to FIG. 2, FIG. 5 and FIG. 6, the support frame 19 extends in the base portion 11 and the abutting portion 12. Referring to FIG. 3, the top of the abutting portion 12 of the base shell 10 has an opening 1203, and the upper end of the support frame 19 can extend out of the opening 1203 and be exposed outside the base shell 10. Referring to FIG. 7, the upper end of the support frame 19 is installed with a base upper limiting piece 311, the structure of which will be described in detail below. In some embodiments, the upper end of the support frame 19 can also be installed with a decorative shell 195, which is in sliding fit with the opening 1203 and serves to close the opening 1203. In addition, the decorative shell 195 can shield unnecessary exposed structures of the upper end of the support frame 19. FIG. 7 shows an exemplary structure of the support frame 19. The support frame 19 includes two longitudinal rods 191 and a plurality of cross rods (including but not limited to a second cross rod 193 and two first cross rods 192) connected between the two longitudinal rods 191. The support frame 19 is mainly in sliding fit with the base shell 10 through the two longitudinal rods 191. Each longitudinal rod 191 can be a one-piece structure or composed of a plurality of separate rod segments. Each longitudinal rod 191 can have a meandering shape so that the distance between the lower ends of the two longitudinal rods 191 is larger and the distance between the upper ends of the two longitudinal rods 191 is smaller. Referring to FIG. 6, the decorative shell 195 is specifically installed at the upper ends of the two longitudinal rods 191. FIG. 8 shows a perspective view of the assembly of the mounting seat 13 and the support frame 19. FIG. 9 shows a perspective view of the base shell 10. FIG. 10 shows a bottom view of the child safety seat 1000 omitting the lower shell 102. FIG. 11 and FIG. 12 show views of the child safety seat 1000 omitting the base shell 10 from different perspectives.FIG. 13 shows a schematic view of a section along the section plane U2-U2 of FIG. 8. FIG. 14 shows a partial schematic view of a section along the section plane U1-U1 of FIG. 4. Referring to FIGS. 9 and 10, the upper shell 101 is provided with an opening 110 corresponding to a portion of the base 11, and a mount 13 is arranged on the opening 110. The mount 13 is fixedly connected with the support frame 19, and the seat shell 2 is rotatably mounted on the mount 13. Referring to FIGS. 7, 8 and 10, the mount 13 is provided with a plurality of mounting holes 131a, the two first cross bars 192 between the two longitudinal bars 191 are provided with a plurality of mounting holes 192a, and a plurality of fasteners (e.g., bolts) 139 pass through the plurality of mounting holes 131a and the plurality of mounting holes 192a, respectively, so as to fix the mount 13 on the support frame 19. That is, the movement and rotation of the mount 13 relative to the support frame 19 are limited. Thus, when the support frame 19 slides relative to the base shell 10, the mount 13 and the seat shell 2 slide relative to the base shell 10 along with the support frame 19, so as to adjust the inclination angle of the seat shell 2. It can be understood that when the support frame 19 slides relative to the base shell 10, the support frame 19 moves forward and backward relative to the base shell 10, thereby changing the inclination angle of the seat shell 2. The size of the mount 13 is preferably designed such that when the mount 13 slides along with the support frame 19 relative to the base shell 10, the mount 13 remains covering the periphery of the opening 110, so as to minimize the exposure of the opening 110. Of course, the manner of fixing the mount 13 to the support frame 19 is not limited to the above example. Referring again to FIGS. 7 and 8, the support frame 19 can also be connected with the mount 13 through a fixing seat 196. The fixing seat 196 can include a plate body 1961 and at least two arm bodies 1962 extending from the plate body 1961. The plate body 1961 abuts against the mount 13. The plate body 1961 is provided with a hole 19610, and a fastener 1968 passes through the hole 19610 and is connected with the mount 13. The arm body 1962 has a hole 19620, and the hole 19620 is sleeved on the second cross bar 193 between the two longitudinal bars 191. The second cross bar 193 is closer to the backrest 12 relative to the first cross bar 192. In some embodiments, the hole 19620 is a non-circular hole, so that the arm body 1962 is non-rotatably sleeved on the second cross bar 193.Referring to FIG. 9, in some embodiments, the upper shell 101 can be further provided with a guide slot 106 communicated with the opening 110 and slidably fitted with the arm body 1962. The fixed seat 196 of the base 1 is provided with a lower limit piece 321 of the base, which is more specifically provided on the plate body 1961. The structure of the lower limit piece 321 will be described below. Referring to FIG. 8, in some embodiments, the front side of the mounting seat 13 can be provided with a handle 136. By operating the handle 136, the support frame 19 can be easily pushed to slide relative to the base shell 10. In some embodiments, the handle 136 protrudes outward from the front side of the mounting seat 13. Referring to FIGS. 5-7 and 9, two or more attachment pieces 1013 are provided inside the base shell 10. The attachment pieces 1013 can be fixed to the upper shell 101 and / or the lower shell 102, for example, by fasteners. The attachment pieces 1013 are spaced apart along the sliding direction of the support frame 19. Each attachment piece 1013 can be made of, but not limited to, a metal material. Each attachment piece 1013 can be provided with an elongated hole 10131 extending along an arc shape. At least one longitudinal rod 191 can be provided with a pin 1916. Each pin 1916 is slidably fitted with the elongated hole 10131 of the corresponding attachment piece 1013, so that the support frame 19 can slide relative to the base shell 10. In some embodiments, the base shell 10 can be further provided with a sliding rail slidably fitted with the support frame 19. Referring to FIGS. 5 and 6, the attachment pieces 1013 can include a first attachment piece 1013a provided near the lower end of the longitudinal rod 191, a second attachment piece 1013b in the middle, and a third attachment piece 1013c provided near the upper end of the longitudinal rod 191. It should be noted that although only one longitudinal rod 191 is provided with the first attachment piece 1013a and the third attachment piece 1013c in FIGS. 5 and 6, it can be understood that in other embodiments, the other longitudinal rod 191 can also be provided with the first attachment piece 1013a and the third attachment piece 1013c. The second attachment piece 1013b in the middle spans the two longitudinal rods 191, and the second attachment piece 1013b is formed with two sliding grooves (not labeled in the figure), and the two longitudinal rods 191 are slidably fitted with the two sliding grooves of the second attachment piece 1013b. Referring to FIGS. 11-14, the sliding position of the support frame 19 relative to the base shell 10 can be locked by the first locking mechanism 131, thereby locking the inclination angle of the seat shell 2. An example structure of the first locking mechanism 131 is shown in this embodiment. The first locking mechanism 131 is mounted to the mounting seat 13.The first locking mechanism 131 comprises a movable locking piece (also referred to as a gear pin) 1311. The base shell 10 is provided with a plurality of locking portions (for example, locking holes) 1310, which are arranged at intervals in the sliding direction of the support frame 19. The locking piece 1311 is selectively connected with the plurality of locking portions 1310, thereby positioning the support frame 19 at different sliding positions, and positioning the seat shell 2 at different reclining angles. Referring to FIG. 11, the plurality of locking portions 1310 can be arranged on the appropriate attachment piece 1013. More specifically, the plurality of locking portions 1310 are arranged on the first attachment piece 1013a. The axis of each locking portion 1310 is parallel to the axis of the pin 1916. Referring to FIG. 9, the first attachment piece 1013a can be clamped between the upper shell 101 and the lower shell 102, and the fastener 1019 is connected in turn through the upper shell 101, the first attachment piece 1013a, and the lower shell 102. The first attachment piece 1013a is made of a metal material, for example, which has high structural strength, and is not easily damaged even if the locking piece 1311 is frequently inserted into or pulled out of the locking portion 1310 during the back-and-forth sliding of the support frame 19. In addition, the first attachment piece 1013a can also be made of a non-metal material with high strength, such as high-strength polyester vinyl. Furthermore, arranging the locking portion 1310 and the elongated hole 10131 on the first attachment piece 1013a also helps to simplify the structural complexity of the base shell 10 and reduce the cost of the base shell 10. Referring to FIGS. 7 and 13 in combination, the longitudinal rod 191 is attached with a sheet 1910 having a first hole 19101 and a second hole 19102, the pin 1916 is arranged in the first hole 19101, and the locking piece 1311 is retained in and slidingly fitted with the second hole 19102. Referring to FIGS. 12 and 13 in combination, the first locking mechanism 131 further comprises a release piece 1312 and a reset spring (also referred to as a second reset spring) 1314. The release piece 1312 can be installed on the front side of the mounting seat 13, and more specifically, the release piece 1312 can be installed on the handle 136. The release piece 1312 is operatively connected with the locking piece 1311 through a traction rope 1313 (shown in dashed lines in FIG. 13). One end of the locking piece 1311 is inside the mounting seat 13 and abuts against the reset spring 1314, which is used to push the locking piece 1311 so that the other end of the locking piece 1311 is clamped with the corresponding locking portion 1310.When the locking member 1311 is engaged with the corresponding locking portion 1310, the first locking mechanism 131 is in a locked state. When it is necessary to adjust the sliding position of the support frame 19, the release member 1312 is pressed while the handle 136 is held, the release member 1312 pulls the locking member 1311 through the traction rope 1313, and the other end of the locking member 1311 is disengaged from the locking portion 1310. When the locking member 1311 is completely disengaged from the corresponding locking portion 1310, the first locking mechanism 131 is in a released state. Then, the handle 136 is pulled or pushed, and after the seat shell 2 is adjusted to a suitable reclining angle, the release member 1312 is released, and the locking member 1311 is engaged with the corresponding locking portion 1310 under the push of the return spring 1314, thereby positioning the seat shell 2 at the adjusted reclining angle. Referring to FIG. 11, the seat shell 2 includes a seat portion 21 and a backrest portion 22 extending upward from the rear end of the seat portion 21, and a headrest 23 can be installed on the backrest portion 22. The backrest portion 22 is detachably provided with side impact protection blocks 29 on both sides (see FIG. 1). The seat portion 21 is rotatably mounted to the mounting base 13, and the relative rotation axis XX of the seat shell 2 and the mounting base 13 is shown in FIG. 14, so that the seat shell 2 can be switched to a forward position or a rearward position, that is, the rotation of the seat shell 2 relative to the mounting base 13 can adjust the orientation of the seat shell 2. Referring to FIGS. 10 and 14, the bottom of the seat portion 21 can be provided with a swivel mechanism 26, and the seat portion 21 is rotatably connected to the mounting base 13 through the swivel mechanism 26. The bottom of the swivel mechanism 26 can be provided with an axial limiting member 6, and the mounting base 13 and the support frame 19 fixedly connected together are clamped between the seat portion 21 and the axial limiting member 6. In some embodiments, the axial limiting member 6, for example, includes a disc coaxial with the rotation axis XX, and the disc abuts the two first cross bars 192 below the two first cross bars 192, thereby clamping the mounting base 13 and the support frame 19 between the seat portion 21 and the disc 61. Referring again to FIG. 2, the upper part of the back of the backrest portion 22 is provided with a seat upper limiting member 312. When the seat shell 2 is in the forward position, the base upper limiting member 311 and the seat upper limiting member 312 cooperate, for example, in a clearance fit. It should be noted that when the seat shell 2 is in the forward position, the base upper limiting member 311 and the seat upper limiting member 312 can not always maintain a connected state of contacting each other, as long as the base upper limiting member 311 and the seat upper limiting member 312 contact each other when the seat shell 2 is forward inclined relative to the base 1, a rearward pulling force is applied to the backrest portion 22 of the seat shell 2.This can prevent the seat shell 2 from tilting forward relative to the base 1 when the vehicle is braked unexpectedly, which can harm the child. In some embodiments, the upper base limiter 311 and the upper seat limiter 312 can have hook-shaped cross sections, and the two are hooked to each other. Of course, the embodiments of the upper base limiter 311 and the upper seat limiter 312 are not limited to this. Referring to FIG. 4, the front side of the back of the seat portion 21 is provided with a lower seat limiter 322. When the seat shell 2 is in the rearward position, the seat shell 2 is rotated relative to the base 1, so that the lower seat limiter 322 is opposite to the lower base limiter 321. At this time, the lower base limiter 321 and the lower seat limiter 322 are engaged, for example, clearance fit. It should be noted that the lower base limiter 321 and the lower seat limiter 322 can not always be in a connected state of being in contact with each other when the seat shell 2 is in the rearward position, as long as the lower base limiter 321 and the lower seat limiter 322 are in contact with each other when the seat shell 2 tilts forward relative to the base 1, so as to exert a rearward pulling force on the seat portion 21 of the seat shell 2, thereby preventing the seat shell 2 from tilting forward relative to the base 1. In some embodiments, the lower base limiter 321 and the lower seat limiter 322 can have hook-shaped cross sections, and the two are hooked to each other. More specifically, the first end of the lower seat limiter 322 is located in the interior of the seat shell 2, and the second end of the lower seat limiter 322 is formed with an engaging hook that extends outward from the interior of the seat shell 2 to be hooked with the lower base limiter 321. Of course, the embodiments of the lower base limiter 321 and the lower seat limiter 322 are not limited to this. Referring to FIG. 14, the rotational position of the seat shell 2 relative to the mounting base 13 can be locked by a second locking mechanism 213. The second locking mechanism 213 includes a movable locking member 2131, and the mounting base 13 is circumferentially provided with at least two lock holes (not shown in the figure) that are located on the rotational track of the locking member 2131. The locking member 2131 cooperates with one of the at least two lock holes, thereby positioning the seat shell 2 in the forward position or the rearward position. The structure of the second locking mechanism 213 will not be described here. Referring to FIG. 2, the first end of the top strap 4 can extend into the interior of the base 1 and be fixed, and the second end of the top strap 4 can be provided with an anchor 43, for example, for connecting with an anchor point on the back of the vehicle seat. The top strap 4 can also be provided with an adjuster 45 for adjusting the length of the top strap 4. Referring to FIG. 7, in some embodiments, the upper base limiter 311 is provided with a support ring 315, and the second end of the top strap 4 extends upward through the support ring 315. That is, the middle portion of the top strap 4 is arranged around the support ring 315.When the vehicle is suddenly braked, the base upper limiting member 311 is pulled by the top strap 4 while being pulled by the seat upper limiting member 312. In this way, the force of the seat shell 2 tilting forward can be transmitted to the vehicle seat through the seat upper limiting member 312, the base upper limiting member 311, and the top strap 4. In addition, the base upper limiting member 311 is simultaneously subjected to two opposite directions of tension, which can offset each other and effectively prevent the base upper limiting member 311 from being damaged. FIG. 15 shows a perspective view of the child safety seat 1000 omitting the crotch belt assembly 70. The seat portion 21 is provided with a crotch belt adjustment area 211, which is, for example, integrally formed with the seat shell 2. In some alternative embodiments, the crotch belt adjustment area 211 can be a separate structure from the seat shell 2 and attached to the seat shell 2. Referring to FIG. 1, the crotch belt assembly 70 in this embodiment is a double-crotch belt structure, including two crotch belts 71 and a crotch belt buckle 72 connected to the two crotch belts 71. The crotch belt adjustment area 211 includes two slot-shaped structures 212 arranged left and right and symmetrical about a vertical plane. The two slot-shaped structures 212 correspond one-to-one to the two crotch belts 71. Each slot-shaped structure 212 includes two crotch belt holes 2121 arranged in sequence in the front-rear direction, and a communication hole 2122 extending in the front-rear direction and communicating with the two crotch belt holes 2121. The crotch belt holes 2121 of the two slot-shaped structures 212 are adjacent to each other, and the communication holes 2122 of the two slot-shaped structures 212 are far away from each other. FIG. 16 shows an enlarged view of one of the slot-shaped structures 212. The crotch belt hole 2121 is generally rectangular, and a first distance T1 of the crotch belt hole 2121 in the front-rear direction corresponds to the width W of the crotch belt 71, and a second distance T2 of the crotch belt hole 2121 in the left-right direction corresponds to the thickness D of the crotch belt 71. The first distance T1 is greater than the second distance T2. The communication hole 2122 is generally C-shaped, and includes a first segment 21221 extending in the front-rear direction and two second segments 21222 extending transversely from the first segment 21221, each second segment 21222 communicating with the corresponding crotch belt hole 2121. A third distance T3 of each second segment 21222 in the front-rear direction corresponds to the thickness D of the crotch belt 71. FIG. 17 shows a bottom view of the seat shell 2.For the convenience of showing the internal structure of the seat shell 2, part of the shell structure of the seat shell 2 and the swivel mechanism 26 for connecting with the mounting seat 13 are omitted in FIG. 17. Referring to FIGS. 1 and 17, the first end 711 of each crotch belt 71 is fixed below the crotch belt adjustment area 211, the middle part of each crotch belt 71 selectively enters any crotch belt hole 2121 through the communication hole 2122 as needed, and the second end of each crotch belt 71 is connected with the crotch belt buckle 72 above the crotch belt adjustment area 211. The crotch belt buckle 72 can be detachably buckled with the shoulder belt buckle 75 (see FIG. 19), which is connected with the shoulder belt 76. Referring to FIG. 1 again, in some embodiments, the second ends of the two crotch belts 71 are connected as a whole and connected with the crotch belt buckle 72, that is, the two crotch belts 71 are formed by different parts of the same webbing. More specifically, the crotch belt buckle 72 has a hole 720, the same webbing is bent after being threaded through the hole 720, the webbing located on one side of the hole 720 forms one crotch belt 71, and the webbing located on the other side of the hole 720 forms the other crotch belt 71. In some alternative embodiments, the two crotch belts 71 can be a split structure, and the second ends of the two crotch belts 71 are respectively connected with different connection holes of the crotch belt buckle 72. The two crotch belts 71 in FIG. 1 are respectively threaded in the front crotch belt holes 2121, at this time the distance between the crotch belts 71 and the backrest part 22 is larger, which allows children with a larger body size to sit on the seat part 21. When it is needed to adjust the position of each crotch belt 71, each crotch belt 71 can be twisted and then entered into the communication hole 2122, and then slid into the rear crotch belt hole 2121 along the communication hole 2122. When each crotch belt 71 is completely entered into the rear crotch belt hole 2121, the position of the crotch belt 71 in the crotch belt hole 2121 is adjusted, so that the width direction of the crotch belt 71 adapts to the front-rear direction of the crotch belt hole. When the two crotch belts 71 are respectively threaded in the rear crotch belt holes 2121, the distance between the crotch belts 71 and the backrest part 22 is smaller, which allows children with a smaller body size to sit on the seat part 21. Referring to FIG. 17 again, in some embodiments, the crotch belt adjustment area 211 is further provided with a reinforcing sheet 275, which can be fixed to the seat shell 2 by screws or other fasteners. More specifically, the reinforcing sheet 275 can be located on the back of the crotch belt adjustment area 211, and the reinforcing sheet 275 has a groove 2751 matched with the groove-shaped structure 212. By providing the reinforcing sheet 275, the structural strength of the crotch belt adjustment area 211 can be enhanced. In some embodiments, the seat shell 2 includes two positioning columns 218 below the crotch belt adjustment area 211, which are, for example but not limited to, integrally formed with the seat shell 2.The first end 711 of the two crotch belts 71 can be formed into a loop by means of sewing, which can be sleeved on the corresponding positioning column 218, so as to realize the positioning of the first end 711 of each crotch belt 71. Of course, in some alternative embodiments, the first end of the crotch belt 71 can also be fixed by any suitable means. In some embodiments, the seat shell 2 can also be provided with a positioning column 218, and the lower end of each crotch belt 71 is connected with the same positioning column 218. In some embodiments, the lower end of the positioning column 218 is inclined to the rear side, which can reduce the position of each crotch belt between the positioning column 218 and the crotch belt hole.

[0030] 2121. Referring back to FIG. 17, the fixing position of the first end 711 of the crotch belt 71, i.e., the position at which the crotch belt 71 is connected to the positioning column 218, is closer to the frontmost crotch belt hole 2121 and farther away from the rearmost crotch belt hole 2121. In this way, when the crotch belt 71 passes through the crotch belt holes 2121 at different positions, the length of the crotch belt 71 exposed from the seat shell 2 is also adjusted, so that an adjuster for adjusting the length of the crotch belt 71 can be omitted. More specifically, when the crotch belt 71 passes through the frontmost crotch belt hole 2121, the exposed length of the crotch belt 71 is the longest, meeting the needs of children of a larger size. When the crotch belt 71 passes through the rearmost crotch belt hole 2121, the exposed length of the crotch belt 71 is the shortest, meeting the needs of children of a smaller size. The scheme provided by the embodiment of the disclosure for adjusting the front and rear positions and the exposed length of the crotch belt 71 has the advantages of simple structure, fewer parts, and convenient use. FIG. 18 shows another bottom view of the seat shell 2. For the convenience of showing the internal structure of the seat shell 2, part of the shell structure of the seat shell 2 and the swivel mechanism for connecting the seat pan 13 are omitted in FIG. 18. The seat lower limit piece 322 can be fixed to the positioning column 218 by the fastener 2181, and the seat lower limit piece 322 can prevent the first end 711 of the crotch belt 71 from accidentally falling off the positioning column 218. More specifically, the first end of the seat lower limit piece 322 is fixed to the positioning column 218. By fixing the first end 711 of the crotch belt 71 and the seat lower limit piece 322 to the positioning column 218, the structure is simplified. Of course, in other embodiments, the first end 711 of the crotch belt 71 can also be limited in movement along the positioning column 218 by other structures. FIGS. 19 and 20 show partial structures of the seat shell 2. The front of the seat shell 2 can be covered with a fabric layer 28, and the fabric layer 28 is provided with an opening 280 at a position corresponding to the crotch belt adjustment area 211, and the opening 280 can be covered by a flap 281. The flap 281 is generally rectangular, and the rear edge 2811 of the flap 281 is sewn to the fabric layer 28, for example, and the front edge of the flap 281 and the fabric layer 28 can be detachably connected by a fixing mechanism. The fixing mechanism includes a first positioning piece 282 fixed to the flap 281 and a second positioning piece 283 fixed to the fabric layer 28, for example. The first positioning piece 282 and the second positioning piece 283 can be magic tapes, snaps, or other components that cooperate with each other. The flap 281 can pass between the two crotch belts 71, so that the first positioning piece 282 and the second positioning piece 283 are connected, thereby covering the opening 280.When the flap 281 covers the opening 280, the left and right edges of the flap 281 and the fabric layer 28 form gaps for the respective crotch belts 71 to pass through. In some embodiments, the flap 281 itself forms the gaps for the respective crotch belts 71 to pass through. In some embodiments, the interior of the flap 281 can be provided with a hard plate 284, which can be but is not limited to a plastic plate. In some alternative embodiments, each slot structure 212 can have other implementations. For example, each slot structure 212 can include three or more crotch belt holes 2121. The communication hole 2122 accordingly includes three or more second sections 21222, and the first section 21221 is in communication with the plurality of crotch belt holes 2121 through the plurality of second sections 21222, allowing the respective crotch belt 71 to enter any of the crotch belt holes 2121 as needed. FIG. 21 shows an alternative implementation of the slot structure 212, which is different from the slot structure 212 shown in FIG. 15 in that the communication holes 2122 of the two slot structures 212 are adjacent to each other, and the crotch belt holes 2121 of the two slot structures 212 are away from each other. When the two crotch belts 71 are moved into the appropriate crotch belt holes 2121, the flap 281 and the hard plate 284 inside the flap 281 can help prevent the respective crotch belt 71 from accidentally moving from the crotch belt hole 2121 to the communication hole 2122. Referring back to FIG. 21, in some embodiments, a protrusion 2123 is provided at the junction of the crotch belt hole 2121 and the communication hole 2122, which can reduce the aperture at the junction of the crotch belt hole 2121 and the communication hole 2122, and also prevent the respective crotch belt 71 from accidentally moving from the crotch belt hole 2121 to the communication hole 2122. FIG. 22 shows yet another alternative implementation of the slot structure 212, which is a variation of the slot structure 212 shown in FIG. 21. More specifically, the first sections 21221 of the communication holes 2122 of the two slot structures 212 are shared, which further simplifies the structure of the slot structure 212. FIG. 23 shows yet another alternative implementation of the slot structure 212. Unlike the slot structure shown in FIG. 16, the three crotch belt holes 2121 are arranged in the front-to-back direction. The first distance T1 of the crotch belt holes 2121 in the front-to-back direction corresponds to the thickness D of the crotch belt 71, and the second distance T2 of the crotch belt holes 2121 in the left-to-right direction corresponds to the width W of the crotch belt 71. The first distance T1 is smaller than the second distance T2. The communication hole 2122 is located at one end of each crotch belt hole 2121.The communication hole 2122 includes a first section 21221 extending in the front-rear direction and three second sections 21222 extending transversely from the first section, each second section 21222 being in communication with a corresponding crotch belt hole 2121. The third distance T3 of each second section 21222 in the front-rear direction corresponds to the thickness D of the crotch belt 71. The crotch belt hole 2121 is provided with a protrusion 2123 at the junction with the communication hole 2122. Figure 24 shows another alternative embodiment of the slot structure 212. The slot structure 212 shown in Figure 24 is a variant of the slot structure 212 shown in Figure 23. More specifically, the communication hole 2122 is located in the middle of each crotch belt hole 2121 and extends in the front-rear direction, thereby connecting each crotch belt hole 2121. The above description of the crotch belt assembly 70 takes the double-crotch belt structure as an example, and it should be noted that the slot structure 212 provided by the embodiments of the present disclosure is also applicable to the crotch belt assembly 70 of the single-crotch belt structure. Figure 25 shows a crotch belt assembly 70 having a single-crotch belt structure. Specifically, the crotch belt assembly 70 includes a single crotch belt 71 arranged centrally, and the slot structure 212 shown in the above embodiments can be provided on the crotch belt adjustment area 211 of the seat shell 2 to adjust the position of the crotch belt 71. The flap 281 can be formed with a slot structure 2810 matching the slot structure 212, and the slot structure 212 in Figure 25 specifically takes the slot structure 212 shown in Figure 24 as an example. Figures 26 to 28 of the second embodiment show different perspective views of the child safety seat 1000 according to the second embodiment of the present disclosure. The child safety seat 1000 of the present embodiment is a variant of the child safety seat 1000 of the above first embodiment, and the structure of the child safety seat 1000 of the present embodiment can refer to the description in the above first embodiment without conflict. It should be particularly pointed out that in the second embodiment and the variants of the second embodiment below, the base shell 10 can include a plurality of hard shells enclosing the outer shape of the base shell 10, or can include a metal connecting piece mounted in the hard shell, which is not particularly limited here. The seat shell 2 in Figures 26 and 27 is in a forward position, and the inclination angle of the seat shell 2 relative to the base 1 is different. The seat shell 2 in Figure 28 is in a rearward position. According to the description in the above first embodiment, when the seat shell 2 is in the rearward position, the inclination angle of the seat shell 2 relative to the base 1 can also be adjusted. Figure 29 shows a perspective view of the child safety seat 1000 omitting the base shell 10, and Figure 30 shows a bottom view of the seat shell 2. Figure 31 shows a top view of the mounting base 13.A top view of the base shell 10 of the present embodiment can be seen in FIGS. 9-32, which show schematic views of cross sections taken along U5-U5 of FIG. 30. FIG. 33 shows a partially exploded view of the mounting seat 13. FIG. 34 shows a schematic view of a cross section taken along U4-U4 of FIG. 29. FIGS. 35 and 36 show schematic views of cross sections taken along U3-U3 of FIG. 29, where the first locking mechanism 131 in FIG. 35 is in a locked state, and the first locking mechanism 131 in FIG. 36 is in an unlocked state. The present embodiment mainly modifies the structure of the first locking mechanism 131 in the first embodiment described above. Specifically, the first locking mechanism 131 includes a locking assembly 13A, an unlocking piece 1312, a traction rope 1313, a return spring 1314, a drive pin 1315, a return spring 1316, and a return spring 1319. Referring to FIGS. 31 and 33, the locking assembly 13A includes a locking piece 1311, a drive block 1317, and a connecting pin 1318, and the locking assembly 13A and the return spring 1314 are mounted to the mounting seat 13. Referring to FIGS. 30, 32, and 34, the unlocking piece 1312, the traction rope 1313, the drive pin 1315, the return spring (which can also be referred to as a first return spring) 1316, and the return spring 1319 are mounted to the seat shell 2, and more specifically, to the seat portion 21 of the seat shell 2. Referring to FIGS. 31 and 33, in some embodiments, the mounting seat 13 includes an upper shell 1301 and a lower shell 1302, and the periphery of the upper shell 1301 and the periphery of the lower shell 1302 can be connected, for example, by fasteners 13015, to form a receiving cavity 1300 between the upper shell 1301 and the lower shell 1302. The upper shell 1301 defines a stepped hole 13010, and the swivel structure 26 of the seat portion 21 is pivotally connected to the hole 13010. The hole 13010 has a bottom wall 13012, and the bottom wall 13012 is provided with a fourth hole 13013, and the drive block 1317 is slidingly fitted in the fourth hole 13013. The sliding direction of the drive block 1317 is parallel to the axis X X, i.e., the drive block 1317 can slide in the axial direction. The rear portion of the lower shell 1302 has a groove 13026 that cooperates with the arm body 1962 of the fixing seat 196 (see FIG. 7), and a hole 13027 for the fastener 1968 (see FIG. 8) to pass through. The bottom of the lower shell 1302 has an annular protrusion 13021, and the annular protrusion 13021 has a central hole 130210 that pivotally cooperates with the swivel structure 26.The annular protrusion 13021 has a bottom wall 13022 and a peripheral wall 13023, the bottom wall 13022 is located below the bottom wall 13012, and a plurality of fasteners are connected with the first horizontal rod 192 of the support frame 19 through the mounting holes 131a of the bottom wall 13012 and the bottom wall 13022. The peripheral wall 13023 is provided with a hole 1303, and the locking piece 1311 is in sliding fit with the hole 1303. The sliding direction of the locking piece 1311 is perpendicular to the axis X X, that is, the locking piece 1311 can slide in the radial direction. Similarly to the first embodiment, on the one hand, the locking piece 1311 can be extended outside the accommodation cavity 1300 through the hole 1303 to be clamped with the corresponding locking portion 1310 (see FIG. 9), so that the first locking mechanism 131 is in the locked state. On the other hand, the locking piece 1311 can be retracted into the accommodation cavity 1300 through the hole 1303 to exit from the locking portion 1310, so that the first locking mechanism 131 is in the unlocked state. The driving block 1317 is operatively connected with the locking piece 1311, so that the axial movement of the driving block 1317 can drive the radial movement of the locking piece 1311. In some embodiments, the driving block 1317 can be provided with an elongated hole 13172, and the locking piece 1311 is in sliding fit with the elongated hole 13172. A inclined hole 13171 is arranged on the hole wall of the elongated hole 13172, a connecting pin 1318 is arranged on the locking piece 1311, and the connecting pin 1318 is in sliding fit with the inclined hole 13171. When the driving block 1317 slides up and down in the axial direction, the wall of the inclined hole 13171 pushes the connecting pin 1318 to slide out or retract in the radial direction. Of course, in some alternative embodiments, the driving block 1317 can also drive the locking piece 1311 to move through other structures. Of course, in some embodiments, the inclined hole and the connecting pin can be interchanged in the positions of the locking piece 1311 and the driving block 1317. The reset spring 1314 is used to apply a force to the locking piece 1311, so that the locking piece 1311 moves to the locking portion 1310 to be clamped with the locking portion 1310. In this embodiment, the bottom of the driving block 1317 has an accommodation groove 13170, one end of the reset spring 1314 extends into the accommodation groove 13170 to abut against the driving block 1317, and the other end of the reset spring 1314 abuts against the wall 1304 below the driving block 1317. The reset spring 1314 applies an upward axial force to the driving block 1317, and drives the locking piece 1311 to move to the locking portion 1310 through the movement of the driving block 1317. Referring to FIGS. 30, 32 and 34, the unlocking piece 1312 can be installed at the front of the seat shell 2, more specifically, the back front of the seat portion 21.For example, a mounting groove 2110 is arranged at the front of the back of the seat portion 21, and the release member 1312 is slidably mounted in the mounting groove 2110. The back of the seat portion 21 is further provided with a third hole 2101, which is located above and opposite to the fourth hole 13013 when the seat shell 2 is in the forward position or the rearward position. A driving pin 1315 is slidably fitted with the third hole 2101, and the sliding direction of the driving pin 1315 is parallel to the axis X X, that is, the driving pin 1315 can slide in the axial direction. The release member 1312 is operatively connected with the driving pin 1315 through a traction rope 1313. Referring to FIGS. 32 and 34, the traction rope 1313 extends inside the seat shell 2, the first end 13131 of the traction rope 1313 is operatively connected with the release member 1312, and the second end 13132 of the traction rope 1313 is connected with the driving pin 1315. When the seat shell 2 is in the forward position or the rearward position, and the release member 1312 is pressed, the second end 13132 of the traction rope 1313 can pull the driving pin 1315 to move downward, and the lower end of the driving pin 1315 in turn pushes the driving block 1317 to move downward. When the pressing force applied to the release member 1312 is removed, the return spring 1316 is used to apply an upward moving force to the driving pin 1315, and the return spring 1319 is used to apply a return force to the release member 1312. Referring to FIG. 32, the second end 13132 of the traction rope 1313 extends upward and is connected with the driving pin 1315, so that when the traction rope 1313 is under stress, the driving pin 1315 is driven to move downward. In order to facilitate the connection of the traction rope 1313 and the driving pin 1315, the upper end of the driving pin 1315 can be fixed with a connecting seat 13151, which extends transversely from the driving pin 1315 and is connected with the second end 13132 of the traction rope 1313. The connecting seat 13151 and the driving pin 1315 can be a separate structure or an integral structure. In addition, the seat shell 2 can also be provided with a steering wheel 13133, which is located below the connecting seat 13151, and the second end 13132 of the traction rope 1313 extends upward to be connected with the connecting seat 13151 after being wound around the steering wheel 13133. In some embodiments, the connecting seat 13151 is slidably fitted with a fixing seat 13152, which is mounted at the bottom of the seat portion 21 of the seat shell 2. The process of adjusting the inclination angle of the child safety seat provided by the present embodiment will be described below in combination with FIGS. 34 to 36. When it is necessary to adjust the inclination angle of the seat shell 2, the hand is inserted into the mounting groove 2110 and presses the release member 1312.Referring to FIG. 36, the release 1312 pulls the driving pin 1315 downward via the pulling rope 1313, the driving pin 1315 pushes the driving block 1317 downward, under the action of the inclined hole 13171 and the connecting pin 1318, the locking piece 1311 retracts from the locking portion 1310. At this time, the hand holds the wall of the mounting groove 2110 and pulls or pushes the seat shell 2, that is, the inclination angle of the seat shell 2 can be adjusted. When the seat shell 2 is adjusted to a suitable inclination angle, the release 1312 is released, and the release 1312 is reset under the push of the reset spring 1319. Referring to FIG. 35, the driving pin 1315 moves upward under the push of the reset spring 1316, the driving block 1317 moves upward under the push of the reset spring 1314, under the action of the inclined hole 13171 and the connecting pin 1318, the locking piece 1311 extends to be clamped with the corresponding locking portion 1310, so as to position the seat shell 2 at the adjusted inclination angle. The mounting seat 13 in the embodiment can omit the handle 136 in the first embodiment. In addition, as can be seen from FIG. 35, when the inclination angle of the seat shell 2 does not need to be adjusted, that is, when the release 1312 is not pressed, the driving pin 1315 is accommodated in the third hole 2101 of the seat shell 2 without extending into the fourth hole 13013, and the driving block 1317 also does not extend into the third hole 2101. Therefore, the driving pin 1315 and the driving block 1317 will not interfere with the rotation of the seat shell 2 relative to the mounting seat 13. In some embodiments, the seat shell 2 can be locked in the forward position or the rearward position by means of the second locking mechanism 213 in the first embodiment. According to the first locking mechanism 131 shown in FIG. 35 and FIG. 36, when the seat shell 2 is in the forward position or the rearward position, the driving pin 1315 is opposite to the fourth hole 13013, allowing the driving pin 1315 to move axially to push the locking piece 1311 out of the locking portion 1310 by the driving block 1317, thereby allowing the inclination angle of the seat shell 2 to be adjusted. When the seat shell 2 is in other positions (for example, the lateral position), the inclination angle of the seat shell 2 cannot be adjusted due to the misalignment of the driving pin 1315 and the driving block 1317. This effectively prevents the inclination angle from being adjusted when the seat shell 2 is in the lateral position, but the problem that the adjusted inclination angle is not comfortable for the child to ride when the seat shell 2 is rotated to the forward position or the rearward position. FIGS. 37-40 show a variant embodiment of the first locking mechanism 131 provided in the second embodiment of the disclosure.As shown in FIG. 37, the third hole 2101 has a stepped hole (also referred to as a stepped portion, or a clamping portion) 21011 for accommodating the upper end of the driving block 1317. When the seat shell 2 is in the forward position or the rearward position, and the release lock 1312 is not pressed, the upper end of the driving block 1317 extends into the hole 21011 and clamps with the hole 21011. At this time, the driving block 1317 locks the rotation of the seat shell 2 relative to the mounting base 13. In addition, the locking member 1311 extends and clamps with the corresponding locking portion 1310, and the inclination angle of the seat shell 2 is also locked. Referring to FIGS. 38 and 40, when the seat shell 2 is in the forward position or the rearward position, the release lock 1312 is pressed along the direction P to move a first stroke L1. At this time, the release lock 1312 drives the driving pin 1315 to move downward through the traction rope 1313, and the driving pin 1315 is not inserted into the fourth hole 13013. The driving block 1317 is pushed downward by the driving pin 1315 and exits the hole 21011. At this time, the driving block 1317 no longer locks the rotation of the seat shell 2 relative to the mounting base 13, and the orientation of the seat shell 2 can be adjusted as needed. When the seat shell 2 is rotated so that the driving pin 1315 and the driving block 1317 are misaligned, the driving block 1317 is pressed by the wall of the seat shell 2 and remains in the fourth hole 13013, and does not extend relative to the fourth hole 13013; and the driving pin 1315 is pressed by the wall of the mounting base 13 and remains in the third hole 2101, and does not extend relative to the hole 21011, so as not to interfere with the rotation of the seat shell 2. In addition, although the locking member 1311 is retracted under the drive of the driving block 1317, a portion of the locking member 1311 still clamps with the corresponding locking portion 1310, and the inclination angle of the seat shell 2 is still locked. Optionally, the lower edge of the hole 21011 is provided with a guide slope (in the direction away from the paper in FIG. 41), so that when the driving block 1317 is not completely pushed out of the hole 21011, the driving block 1317 can be pushed out of the hole 21011 by rotating the seat shell 2, relying on the guide slope, to improve the fault tolerance space of the release lock operation of the release lock 1312. Referring to FIGS. 39 and 40, when the seat shell 2 is in the forward position or the rearward position, the release lock 1312 is pressed along the direction P to move a second stroke L2, which is greater than the first stroke L1. At this time, the release lock 1312 drives the driving pin 1315 to move downward through the traction rope 1313, and the driving pin 1315 is inserted into the fourth hole 13013 of the mounting base 13.The driving block 1317 is pushed down by the driving pin 1315 to move out of the holding hole 21011. At this time, the cooperation between the driving pin 1315 and the fourth hole 13013 can limit the rotation of the seat shell 2 relative to the mounting base 13, and the orientation of the seat shell 2 cannot be adjusted. The locking piece 1311 is completely out of the corresponding locking portion 1310 under the driving of the driving block 1317, and at this time the inclination angle of the seat shell 2 can be adjusted. Referring to FIG. 40, in some embodiments, a reset spring 1319 is installed in the mounting groove 2110, and the reset spring 1319 is kept in abutment with the release piece 1312 for driving the release piece 1312 to reset. In addition, a damping spring 13109 can also be installed in the mounting groove 2110, and when the release piece 1312 moves within the first stroke L1, the damping spring 13109 can hardly exert a damping force on the release piece 1312. When the moving stroke of the release piece 1312 exceeds the first stroke L1, the damping spring 13109 exerts a damping force on the release piece 1312. This helps the user to judge whether the release piece 1312 has moved to the first stroke L1 by the difference in the felt resistance. Of course, there are many ways to judge whether the release piece 1312 has moved to the first stroke L1. In some alternative embodiments, a boss (not shown in the figure) corresponding to the position of the first stroke L1 can be arranged on the groove wall of the mounting groove 2110, and when the release piece 1312 moves to the boss, the user can judge that the release piece 1312 has moved the first stroke L1 by the suddenly increased resistance. When it is necessary to continue to move the release piece 1312, the user can exert a force to make the release piece 1312 pass over the boss. It can be understood that the design of the boss should not affect the reset spring 1319 to push the release piece 1312 to reset. FIGS. 41 and 42 show another variant embodiment of the first locking mechanism 131 provided in the second embodiment of the present disclosure. As shown in FIG. 41, the third hole 2101 has a hole 210110 for accommodating the driving block 1317. When the seat shell 2 is in the forward position or the rearward position, and the release piece 1312 is not pressed, the upper end of the driving block 1317 extends into the hole 210110, and at this time the driving block 1317 is in the first position. At this time, the driving block 1317 locks the rotation of the seat shell 2 relative to the mounting base 13. In addition, the locking piece 1311 extends to be clamped with the corresponding locking portion 1310, and the inclination angle of the seat shell 2 is also locked. Referring to FIG. 42, when the seat shell 2 is in the forward position or the rearward position, the release piece 1312 is pressed. The release piece 1312 drives the driving pin 1315 to move down through the traction rope 1313, and the driving pin 1315 is not inserted into the fourth hole 13013.The driving block 1317 is pushed downward by the driving pin 1315 to exit the hole 2101, and at this time, the driving block 1317 no longer locks the rotation of the seat shell 2 relative to the mounting seat 13, and the orientation of the seat shell 2 can be adjusted as needed. At the same time, the locking piece 1311 is completely withdrawn from the corresponding locking portion 1310 under the drive of the driving block 1317, and at this time the driving block 1317 is located at the second position, and the user can adjust the inclination angle of the seat shell 2 and the orientation of the seat shell 2 at the same time. When the first locking mechanism 131 is implemented in the manner shown in FIGS. 37-42, the second locking mechanism 213 shown in FIG. 14 for positioning the orientation of the seat shell 2 can be omitted. Alternatively, in the embodiment shown in FIGS. 37-42, the locking piece 1311 can be referred to as part of the first locking mechanism, and the driving block 1317, the driving pin 1315, and the release piece 1312 can be referred to as part of the second locking mechanism. The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict each other, they should be considered within the scope of the present disclosure. The above-described embodiments only express several implementations of the present disclosure, which are described in a specific and detailed manner, but should not be construed as limiting the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present disclosure, a number of modifications and improvements can be made, which are within the scope of the present disclosure. Therefore, the scope of protection of the present disclosure should be subject to the appended claims.

Claims

CLAIM 1. A child safety seat comprising: A seat shell; A base including a base shell and a mounting seat, the seat shell being rotatably mounted to the mounting seat, the mounting seat being slidably mounted to the base shell in a forward and backward direction, the base shell being provided with a plurality of locking portions; A first locking mechanism including a driving pin provided on the seat shell, a release member provided on the seat shell and operatively connected with the driving pin, and a locking assembly provided on the mounting seat and including a locking member selectively engaged with the locking portions to lock the seat shell from sliding, wherein the driving pin is operatively connected with the locking assembly to drive the locking member out of the corresponding locking portion.

2. A child safety seat according to claim 1, characterised in that: The seat shell is provided with a third hole, the driving pin being slidably fitted in the third hole; the locking assembly includes a driving block operatively connected with the locking member; The mounting seat is provided with a fourth hole, the driving block being slidably fitted in the fourth hole; When the seat shell is in a forward position or a backward position, the third hole is aligned with the fourth hole, and the driving pin is driven to push the driving block downward when the release member is subjected to an external release force, so that the driving block drives the locking member out of the corresponding locking portion.

3. The child safety seat of claim 2, wherein: An upper end of the driving pin is fixed with a connecting seat, a lower end of the driving pin is used to push the driving block, the connecting seat extends transversely at the upper end of the driving pin; the seat shell can also be provided with a steering wheel below the connecting seat; the first locking mechanism further includes a traction rope, a first end of the traction rope being operatively connected with the release member, a second end of the traction rope extending upward after being wound around the steering wheel to be connected with the connecting seat.

4. The child safety seat of claim 2, wherein, One of the locking member and the driving block is provided with an inclined hole, the other one of the locking member and the driving block is provided with a connecting pin slidably fitted in the inclined hole to engage or disengage the locking member with the locking portion.

5. The child safety seat of claim 1, wherein: The first locking mechanism further includes a first reset spring for driving the driving pin to reset; when the pressing force applied to the release member is removed, the first reset spring applies an upward moving force to the driving pin.

6. A child safety seat, characterised in that, The seat shell; The base including a base shell and a mounting seat, the seat shell being rotatably mounted to the mounting seat, the mounting seat being slidably mounted to the base shell in a forward and backward direction; The first locking mechanism for operatively locking the sliding between the mounting seat and the base shell; ​ and a second locking mechanism for operatively locking rotation between the seat shell and the mounting base; wherein the first locking mechanism comprises: a plurality of locking portions provided on the base shell; and a locking member movably provided on the mounting base and selectively engaged with the plurality of locking portions to lock sliding of the seat shell; wherein the second locking mechanism comprises:

7. A child safety seat according to claim 6, characterised in that: an engaging portion provided on the seat shell; and a driving block movably provided on the mounting base and operatively engaged with the engaging portion; when the driving block is engaged with the hole portion, the first locking mechanism locks rotation between the seat shell and the mounting base; wherein the driving block cooperates with the locking member, when the driving block is disengaged from the engaging portion, the driving block drives the locking member to unlock the locking portions.

8. A child safety seat according to claim 7, characterised in that: The second locking mechanism further comprises: a driving pin movably provided in the engaging portion; and a release member provided on the seat shell and capable of driving the driving pin to move so as to push the driving block away from the engaging portion via the driving pin.

9. The child safety seat of claim 7, wherein: The release member has a first stroke and a second stroke; when the release member moves the first stroke, the driving block is disengaged from the engaging portion to unlock rotation between the seat shell and the mounting base; when the release member moves the second stroke, the driving pin extends into the mounting base to lock sliding between the seat shell and the mounting base, and the driving block drives the locking member to disengage from the locking portions to unlock sliding between the mounting base and the base shell.

10. A child safety seat, characterised in that, The driving block is movably provided on the mounting base and has a first position and a second position; and the release member is capable of driving the driving block to move between the first position and the second position, wherein when the driving block moves to the first position in a first direction, rotation between the seat shell and the mounting base is locked, and sliding between the mounting base and the base shell is locked by the locking member; wherein when the driving block moves to the second position in a second direction, rotation between the seat shell and the mounting base is unlocked, and sliding between the mounting base and the base shell is unlocked by the locking member. comprising: a seat shell; a base comprising a base shell and a mounting base, the seat shell being rotatably mounted to the mounting base, the mounting base being slidably mounted to the base shell in a front-rear direction; a driving block movably provided on the mounting base and having a first position and a second position; a locking member driven by the driving block to move between a locking position and an unlocking position; and a release element disposed at the seat shell and capable of driving the driving block to move between the first position and the second position, wherein when the driving block moves in a first direction to the first position, the rotation between the seat shell and the mounting seat is locked, and the sliding between the mounting seat and the base shell is locked by the locking element; wherein when the driving block moves in a second direction to the second position, the rotation between the seat shell and the mounting seat is released, and the sliding between the mounting seat and the base shell is released by the locking element.

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