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] This disclosure relates to the field of child safety seats. Background Art: Child safety seats provide convenience and safety for children traveling in vehicles. Child safety seats are equipped with a seatbelt system, which includes cooperating shoulder straps and crotch straps, allowing the child to be safely and unsecured in the child safety seat. To accommodate children of different sizes, the fore-and-aft position of the crotch strap is generally adjustable. An adjuster can also be provided on the crotch strap, allowing for length adjustment as well. However, existing crotch strap adjustment structures are relatively complex and costly. Furthermore, some commercially available child safety seats include a base and a seat with an adjustable tilt angle relative to the base; the tilt angle adjustment mechanism between the seat and the base is relatively complex. Summary of the Invention: A first aspect of this disclosure provides a child safety seat, including a seat housing and a crotch strap assembly. The seat housing includes a seat portion, which has a crotch strap adjustment area. The crotch strap adjustment area includes at least two groove-shaped structures arranged spaced apart laterally. Each of the groove-shaped structures includes at least two crotch strap holes arranged sequentially in the fore-and-aft direction, and a connecting hole extending in the fore-and-aft direction and communicating with the at least two crotch strap holes. The crotch strap assembly includes 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. The middle portion of each crotch strap selectively enters either of the crotch strap holes via the corresponding connecting holes of the grooved structure. A second end of each crotch strap is connected to the crotch strap buckle above the crotch strap adjustment area. The seat housing also includes at least one positioning post located to the front of the crotch strap adjustment area. The first end of each crotch strap is fitted onto the at least one positioning post. In the first aspect described above, the crotch strap adjustment area is integrally formed with the seat housing. The crotch strap adjustment area also includes a reinforcing plate made of metal and fixed to the seat housing. The reinforcing plate has grooves corresponding to the crotch strap holes and the connecting holes. In the first aspect described above, the lower end of the positioning post is configured to tilt towards the rear of the crotch strap adjustment area. The seat housing further includes a lower seat limiting member, which is fixed to the at least one positioning post to prevent the first ends of the at least two crotch straps from detaching from the at least one positioning post. In the first aspect described above, the first end of the lower seat limiting member is fixed to the at least one positioning post, and the second end forms an engaging hook that extends outward from the interior of the seat housing; the child safety seat further includes a base, and the seat housing is pivotally mounted on the base; the base has a lower base limiting member that engages with the lower seat limiting member when the seat housing is in the rearward position.In the first aspect described above, the seat is covered with a fabric layer, and the fabric layer has an opening corresponding to the position of the crotch strap adjustment area. The opening can be covered by a flap. When the flap covers the opening, a gap is formed between the edge of the flap and the fabric layer, or between the flap itself, for the at least two crotch straps to pass through. A rigid plate is provided inside the flap. In the second aspect described above, the child safety seat further includes a base, the base comprising: a base housing; a support frame housed within the base housing, the support frame slidingly engaging with the base housing to change the tilt angle of the seat housing; and a mounting seat fixed to the support frame. The seat housing is rotatably mounted on the mounting seat to switch between a forward and a rearward position. The support frame is provided with a base upper limit member and a base lower limit member, and the seat housing includes a seat upper limit member and a seat lower limit member. When the seat housing is in the forward position, the base upper limit member engages with the seat upper limit member of the seat housing. When the seat housing is in the rearward position, the lower limit member of the base engages with the lower limit member of the seat housing. The base housing has at least two attachments arranged at intervals along the sliding direction of the support frame. Each attachment has an elongated hole, and the support frame has at least two pins that slidably engage with their corresponding elongated holes. At least one attachment has at least two locking holes spaced apart along the sliding direction of the support frame, with the axis of each locking hole parallel to the axis of the pin. The mounting base has a locking member that selectively engages with the at least two locking holes to lock the tilt angle of the seat housing. The first aspect of this disclosure provides a child safety seat, comprising: a seat housing; a base, including a base housing and a mounting seat, wherein the seat housing is rotatably mounted to the mounting seat, and the mounting seat is slidably mounted to the base housing, the seat housing having a plurality of locking portions; and a first locking mechanism, comprising: a release member disposed on the seat housing; a drive pin disposed on the seat housing; and a locking assembly disposed on the mounting seat, the locking assembly including a locking member selectively engaging with the plurality of locking portions to lock the sliding of the seat housing. The release member is operably connected to the drive pin, and the drive pin is operably connected to the locking assembly for driving the locking member to disengage from the corresponding locking portion. In the second aspect described above, the seat housing has a third hole, and the drive pin slidably engages with the third hole.The locking assembly includes a drive block operably connected to the locking member. The mounting base has a fourth hole, and the drive block slides into the fourth hole. When the seat housing is in a forward or rearward position, the second hole aligns with the fourth hole, and when the release member is subjected to an external release force, it drives the drive pin to push the drive block downwards, causing the drive block to drive the locking member out of the corresponding locking portion. In the second aspect described above, the upper end of the drive pin is fixed with a connecting pin, the lower end of the drive pin is used to push against the drive block, and the connecting seat extends laterally from the upper end of the drive pin. The seat housing may also be equipped with a steering wheel, located below the connecting seat. The first locking mechanism further includes a traction rope, the first end of which is operably connected to the release member, and the second end of which wraps around the steering wheel and extends upwards to connect with the connecting seat. In the second aspect described above, one of the locking member and the driving block is provided with an oblique hole, and the other of the locking member and the driving block is provided with a connecting pin. The connecting pin slides with the oblique hole to engage or disengage the locking member from the locking part. In the second aspect described above, the first locking mechanism further includes at least one of the following: a first return spring for driving the driving pin to reset; and a second return spring for driving the locking member to engage with the locking part. A second aspect of this disclosure provides a child safety seat, comprising: a seat housing; a base, including a base housing and a mounting seat, wherein the seat housing is rotatably mounted to the mounting seat, and the mounting seat is slidably mounted to the base housing; a first locking mechanism for operably locking the sliding between the mounting seat and the base housing; and a second locking mechanism for operably locking the rotation between the seat housing and the mounting seat; wherein the first locking mechanism comprises: a plurality of locking portions disposed on the base housing; and a locking member movably disposed on the mounting seat and selectively engaging with the plurality of locking portions to lock the sliding of the seat housing. The second locking mechanism comprises: an engaging portion disposed on the seat housing; and a drive block movably disposed at the mounting seat and operably engaging the engaging portion; when the drive block engages the engaging portion, the first locking mechanism locks the rotation between the seat housing and the mounting seat. The driving block cooperates with the locking member. When the driving block disengages from the engaging portion, the driving block drives the locking member to release the lock between itself and the locking portion. In the third aspect described above, the engaging portion is a hole.The second locking mechanism further includes: a drive pin movably disposed within the engaging portion; and a release member disposed on the seat housing, capable of driving the drive pin to move, thereby pushing the drive block away from the engaging portion via the drive pin. In the second aspect described above, the release member has a first stroke and a second stroke. When the release member moves through the first stroke, the drive block disengages from the engaging portion to unlock rotation between the seat housing and the mounting base. When the release member moves through the first stroke, the drive pin extends into the mounting base to lock sliding between the seat housing and the mounting base, and the drive block drives the locking member to disengage from the locking portion to unlock sliding between the mounting base and the base housing. The fourth aspect of the present disclosure provides a child safety seat, comprising: a seat housing; a base, including a base housing and a mounting seat, the seat housing being rotatably mounted to the mounting seat, and the mounting seat being slidably mounted to the base housing; a drive block movably disposed at the mounting seat and having a first position and a second position; and a release member disposed at the seat housing and capable of driving the drive block to move between the first position and the second position. When the drive block moves along a first direction to the first position, rotation between the seat housing and the mounting seat is locked, and sliding between the mounting seat and the base housing is locked. When the drive block moves along a second direction to the second position, sliding between the mounting seat and the base housing is released, and rotation between the seat housing and the mounting seat is released. The accompanying drawings, which constitute a part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.Figures 1 to 4 show views of the child safety seat provided according to the first embodiment of the present disclosure from different perspectives; Figures 5 and 6 show exploded views of the base housing and support frame of the child safety seat shown in Figure 1; Figure 7 shows a perspective view of the support frame in Figures 5 and 6; Figure 8 shows a perspective view of the mounting base and support frame of the child safety seat shown in Figure 1 assembled together; Figure 9 shows a perspective view of the base housing of the child safety seat shown in Figure 1; Figure 10 shows a bottom view of the child safety seat shown in Figure 1 with part of the base housing omitted; Figures 11 and 12 show views of the child safety seat shown in Figure 1 with the base housing omitted from different perspectives; Figure 13 shows a schematic diagram of a cross-section along U2-U2 in Figure 8; Figure 14 shows a partial schematic diagram of a cross-section along U1-U1 in Figure 4; Figure 15 shows a perspective view of the child safety seat in Figure 1 with the crotch strap assembly omitted; Figure 16 shows an enlarged view of the groove structure at point N of the child safety seat shown in Figure 1, wherein the crotch strap is located in the rear crotch strap hole. Figures 17 and 18 show bottom views of the seat shell of the child safety seat shown in Figure 1 from different perspectives. To better illustrate the internal structure of the seat shell, parts of the seat shell structure are omitted in Figures 17 and 18. Figures 19 and 20 show partial structures of the seat shell of the child safety seat shown in Figure 1. In Figure 19, the flap closes the opening in the fabric layer, and in Figure 20, the flap opens the opening in the fabric layer. Figures 21 to 24 show different variations of the groove structure shown in Figure 15. Figures 34 to 36 show a schematic cross-sectional view of the first locking mechanism; Figures 37 to 39 show partial schematic cross-sectional views along U3-U3 of Figure 29; Figure 40 shows a partial schematic cross-sectional view along U4-U4 of Figure 29; Figures 37 to 40 show a variant embodiment of the first locking mechanism; and Figures 41 and 42 show partial schematic cross-sectional views along U3-U3 of Figure 29; Figures 41 and 42 show another variant embodiment of the first locking mechanism. (Note: The reference numerals are not included in the provided text.)

[0002] 1000. Child safety seats;

[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. Abutment; 1203. Opening;

[0008] 13. Mounting base; 1301. Upper housing; 1302. Lower housing; 1303. Hole; 1304. Wall; 13015. Fastener; 1300. Receiving cavity; 13010. Hole; 13012. Bottom wall; 13013. Fourth hole; 1302k. Annular protrusion; 130210. Center hole; 13022. Bottom wall; 13023. Peripheral wall; 13026. Groove; 13027. Hole; 131a. Mounting hole;

[0009] 131. First locking mechanism; 13A. Locking assembly; 1310. Locking part; 13109. Damping spring; 1311. Locking element; 1312. Releasing element; 1313. Traction rope; 13131. First end; 13132. Second end; 13133. Steering wheel; 1314. Return spring; 1315. Drive pin; 13151. Base; 13152. Fixing seat; 1316. Return spring; 1317. Drive block; 13170. Receiving groove; 13171. Slanted hole; 13172. Elongated hole; 1318. Connecting pin; 1319. Return spring;

[0010] 136. Handle;

[0011] 139. Fasteners;

[0012] 19. Support frame; 191. Longitudinal bar; 1910. Sheet; 19101. First hole; 19102. Second hole; 1916. Pin; 192. First crossbar; 192a. Mounting hole; 193. Second crossbar; 195. Decorative shell; 196. Fixture; 1961. Plate; 1962. Arm; 19620. Hole; 1968. Fastener;

[0013] 2. Seat shell;

[0014] 21. Seat; 2101. Third hole; 21011. Hole; 211. Crotch belt adjustment area; 2110. Mounting groove; 212. Groove structure; 2121. Crotch belt hole; 2122. Connecting hole; 21221. First section; 21222. Second section; 2123. Protrusion; 213. Second locking mechanism; 2131. Locking element; 218. Positioning pin; 2181. Fastener;

[0015] 22. Backrest section;

[0016] 23. Headrest;

[0017] 26. Rotary mechanism;

[0018] 275. Reinforcing plate; 2751. Groove;

[0019] 28. Fabric layer; 280. Opening; 281. Flip-top; 2811. Rear edge; 2810. Channel structure; 282. First positioning element; 283. Second positioning element; 284. Rigid plate;

[0020] 29. Side impact protection block;

[0021] 311. Base upper limit component; 312. Seat upper limit component; 315. Support ring; 321. Base lower limit component; 322. Seat lower limit component;

[0022] 4. Top tie; 43. Anchor; 45. Adjuster;

[0023] 6. Axial limiting component; 61. Disc;

[0024] 7. Seat belt system; 70. Crotch strap assembly; 71. Crotch strap; 711. First end; 72. Crotch strap buckle; 720. Hole; 75. Shoulder strap buckle; 76. Shoulder strap;

[0025] L1, First leg of the journey; L2, First leg of the journey;

[0026] P, direction;

[0027] T1, First distance; T2, Second distance; T3, Third distance;

[0028] D. Thickness; W. Width;

[0029] XX, Axis. Detailed Description First Embodiment Figures 1 to 4 show views of a child safety seat 1000 provided according to a first embodiment of this disclosure from different perspectives. The child safety seat 1000 includes a base 1 and a seat housing 2. The base 1 is for mounting on a vehicle seat, and the seat housing 2 is mounted to the base 1. The base housing 2 is pivotable relative to the base 1 so that the seat housing 2 has at least a forward position (as shown in Figures 1 to 3) and a rearward position (as shown in Figure 4). When the seat housing 2 is in the forward position, the child sitting in the seat housing 2 faces forward of the vehicle. Referring to Figure 4, when the seat housing 2 is in the rearward position, the child sitting in the seat housing 2 faces rearward of the vehicle. At least a portion of the seat housing 2 may be covered with a fabric layer 28 (see Figure 19) to provide comfort and safety for the child. The seat housing 2 is also equipped with a top strap 4 and a seat belt system 7 (see Figure 19). The top strap 4 is used to prevent the seat housing 2 from tipping forward during sudden stopping. The seat belt system 7 includes a crotch strap assembly 70 and a shoulder strap 76. The seat belt system 7 is used to reliably restrain a child within the seat housing 2. It should be noted that, in this embodiment, the directional terms such as "front," "rear," "left," and "right" for the seat housing 2 are based on the "front," "rear," "left," and "right" orientations of the child sitting in the seat housing 2, while the directional terms such as "front," "rear," "left," and "right" for the base 1 refer to the "front," "rear," "left," and "right" orientations of the vehicle when the base 1 is installed on the vehicle seat. These directional terms are used only to make the description of the embodiments of this disclosure clearer and are not intended to unduly limit the scope of protection of this disclosure. Specifically, in Figure 1, the seat housing 2 is in the forward position, where its front-back and left-right orientations are the same as those of the base 1. Arrows F and B in Figure 1 schematically indicate the "front" and "rear" directions of the base 1, and arrows L and R schematically indicate the "left" and "right" directions. In Figure 4, the seat housing 2 is in the rear position, where its front-back and left-right orientations are opposite to those of the base 1. The base 1 includes a base housing 10, a support frame 19 (see Figure 5), and a mounting base 13. The base housing 10 may include a base 11 and an abutment portion 12 extending upward from the base 11. The base 11 is used to rest on the seat surface of the vehicle seat, and the abutment portion 12 is used to abut against the backrest of the vehicle seat. The support frame 19 is installed within the base housing 10 and can slide relative to the base housing 10.Referring to the exploded views of the base housing 10 and support frame 19 shown in Figures 5 and 6, the base housing 10 may include a plurality of rigid shells that define the shape of the base housing 10, and the plurality of rigid shells define the internal space of the base housing 10. In some embodiments, the plurality of rigid shells include, for example, an upper shell 101 and a lower shell 102, where the upper shell 101 corresponds to the stop surface of the base housing 10 and the lower shell 102 corresponds to the back surface of the base housing 10. Of course, in other embodiments, the base housing 10 may have other implementations. Most of the structure of the support frame 19 is located in the internal space of the base housing 10, that is, the support frame 19 is housed within the base housing 10. The support frame 19 slides with the base housing 10. In some embodiments, the support frame 19 is formed, for example, mainly by connecting a plurality of metal tubes by welding, screwing, etc., so that the support frame 19 has sufficient structural strength. Referring to Figures 2, 5, and 6, the support frame 19 extends in the base 11 and the abutment portion 12. Referring to Figure 3, the top of the abutment portion 12 of the base housing 10 has an opening 1203, through which the upper end of the support frame 19 can extend and be exposed outside the base housing 10. Referring to Figure 7, a base upper limit member 311 is installed at the upper end of the support frame 19, the structure of which will be described in detail below. In one embodiment, a decorative shell 195 may also be installed at the upper end of the support frame 19, which slides with the opening 1203 to close it. Additionally, the decorative shell 195 conceals unnecessary exposed structures at the upper end of the support frame 19. Figure 7 shows an exemplary structure of the support frame 19. The support frame 19 includes two longitudinal bars 191 and a plurality of crossbars (including but not limited to a second crossbar 193 and two first crossbars 192) connected between the two longitudinal bars 191. The support frame 19 is primarily slidably engaged with the base housing 10 via the two longitudinal bars 191. The longitudinal bar 191 can be a single piece or composed of multiple individual segments connected together. Each longitudinal bar 191 can have a zigzag shape, such that the distance between the lower ends of two longitudinal bars 191 is larger, and the distance between the upper ends of two longitudinal bars 191 is smaller. Referring to Figure 6, the decorative shell 195 is specifically mounted on the upper ends of two longitudinal bars 191. Figure 8 shows a perspective view of the mounting base 13 and support frame 19 assembled together. Figure 9 shows a perspective view of the base housing 10. Figure 10 shows a bottom view of the child safety seat 1000, omitting the lower housing 102.Figures 11 and 12 show different perspective views of the child safety seat 1000, omitting the base housing 10. Figure 13 shows a schematic diagram of a cross-section along U2-U2 in Figure 8. Figure 14 shows a partial schematic diagram of a cross-section along U1-U1 in Figure 4. Referring to Figures 9 and 10, the upper housing 101 has an opening H 110 corresponding to the base 11, and the mounting seat 13 covers the opening 110. The mounting seat 13 is fixedly connected to the support frame 19, and the seat housing 2 is rotatably mounted on the mounting seat 13. Referring to Figures 7, 8, and 10, the mounting seat 13 has multiple mounting holes 131a, and the two first crossbars 192 located between the two longitudinal bars 191 have multiple mounting holes 192a. Multiple fasteners (e.g., bolts) 139 pass through the multiple mounting holes 131a and the multiple mounting holes 192a, respectively, thereby fixing the mounting seat 13 to the support frame 19. That is, the movement and rotation of the mounting base 13 relative to the support frame 19 are restricted. Therefore, when the support frame 19 slides relative to the base housing 10, the mounting base 13 and the seat housing 2 slide together with the support frame 19 relative to the base housing 10, thereby adjusting the tilt angle of the seat housing 2. It can be understood that when the support frame 19 slides relative to the base housing 10, the support frame 19 moves back and forth relative to the base housing 10, thereby changing the tilt angle of the seat housing 2. The dimensions of the mounting base 13 are preferably designed such that when the mounting base 13 slides with the support frame 19 relative to the base housing 10, the mounting base 13 remains covering the periphery of the opening 110, so as to minimize the exposure of the opening 110. Of course, the method of fixing the mounting base 13 to the support frame 19 is not limited to the above examples. Referring again to Figures 7 and 8, the support frame 19 can also be connected to the mounting base 13 via a fixing seat 196. The fixing seat 196 may include a plate 1961 and at least two arms 1962 extending from the plate 1961. The plate 1961 abuts against the mounting base 13. A hole 19610 is provided on the plate 1961, through which a fastener 1968 passes and connects to the mounting base 13. The arm 1962 has a hole 19620, which is fitted onto a second crossbar 193 located between two longitudinal bars 191. The second crossbar 193 is closer to the backrest 12 relative to the first crossbar 192. In some embodiments, the hole 19620 is a non-circular hole, so that the arm 1962 is fitted onto the second crossbar 193 without relative rotation.Referring to Figure 9, in some embodiments, the upper housing 101 may also be provided with a guide groove 106 communicating with the opening 110 and slidingly engaging with the arm 1962. A lower base limiting member 321 is provided on the fixing seat 196 of the base 1. More specifically, the lower base limiting member 321 is provided on the plate 1961, and its structure will be described in detail below. Referring to Figure 8, in some embodiments, a handle 136 may be provided on the front side of the mounting base 13. By operating the handle 136, the support frame 19 can be easily pushed to slide relative to the base housing 10. In some embodiments, the handle 136 protrudes outward from the front side of the mounting base 13. Referring to Figures 5 to 7 and Figure 9, two or more attachments 1013 are provided inside the base housing 10. These attachments 1013 can be fixed to the upper housing 101 and / or the lower housing 102, for example, by fasteners. The attachments 1013 are spaced apart along the sliding direction of the support frame 19. Each attachment 1013 can be made of, but is not limited to, a metallic material. Each attachment 1013 may have an elongated hole 10131 extending in an arc shape. At least one longitudinal rod 191 may be fitted with a pin 1916, which slidably engages with the elongated hole 10131 of the corresponding attachment 1013, allowing the support frame 19 to slide relative to the base housing 10. In some embodiments, the base housing 10 may also have a sliding track that slidably engages with the support frame 19. Referring to Figures 5 and 6, the plurality of attachments 1013 may include a first attachment 1013a disposed near the lower end of the longitudinal rod 191, a second attachment 1013b disposed in the center, and a second attachment 1013c disposed near the upper end of the longitudinal rod 191. It should be noted that although only one longitudinal rod 191 is shown in Figures 5 and 6 with a first attachment 1013a and a third attachment 1013c, it can be understood that in other embodiments, another longitudinal rod 191 may also be disposed with a first attachment 1013a and a second attachment 1013c. The centrally located second attachment 1013b spans two longitudinal rods 191 and forms two sliding grooves (not labeled in the figures), with the two longitudinal rods 191 slidingly engaging with the two sliding grooves of the second attachment 1013b. Referring to Figures 11 to 14, the sliding position of the support frame 19 relative to the base housing 10 can be locked by the first locking mechanism 131, thereby locking the tilt angle of the seat housing 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 base 13.The first locking mechanism 131 includes a movable locking element (also referred to as a shift pin) 1311. The base housing 10 is provided with a plurality of locking portions (e.g., lock holes) 1310, which are spaced apart in the sliding direction of the support frame 19. The locking element 1311 is selectively connected to the plurality of locking portions 1310, thereby positioning the support frame 19 in different sliding positions, and consequently positioning the seat housing 2 at different tilt angles. Referring to FIG. 11, the plurality of locking portions 1310 may be provided on a suitable attachment 1013. More specifically, the plurality of locking portions 1310 are provided on the first attachment 1013a. The axis of each locking portion 1310 is parallel to the axis of the pin 1916. Referring to Figure 9, the first attachment 1013a can be clamped between the upper housing 101 and the lower housing 102. The fastener 1019 passes sequentially through the upper housing 101 and the first attachment 1013a before connecting to the lower housing 102. The first attachment 1013a can be made of, for example, metal. Metal attachments have high structural strength, and even if the locking member 1311 is frequently inserted into or removed from the locking part 1310 during the back-and-forth sliding of the support frame 19, the first attachment 1013a is not easily damaged. Alternatively, the first attachment 1013a can also be made of a non-metallic material with good strength, such as high-strength polyester. Furthermore, providing the locking part 1310 and the elongated hole 10131 on the first attachment 1013a also helps to simplify the structural complexity of the base housing 10 and reduce the cost of the base housing 10. Referring to Figures 7 and 13, a sheet 1910 is attached to the longitudinal rod 191. The sheet 1910 has a first hole 19101 and a second hole 19102. A pin 1916 passes through the first hole 19101, and a locking member 1311 remains in the second hole 19102 and slides in engagement with it. Referring to Figures 12 and 13, the first locking mechanism 131 also includes a release member 1312 and a return spring (also referred to as a second return spring) 1314. The release member 1312 can be mounted on the front side of the mounting base 13. More specifically, the release member 1312 can be mounted on the handle 136. The release member 1312 is operably connected to the locking member 1311 via a traction rope 1313 (shown in dashed lines in Figure 13). One end of the locking member 1311 is inside the mounting base 13 and abuts against the return spring 1314. The return spring 1314 is used to push the locking member 1311 so that the other end of the locking member 1311 is connected to the corresponding locking part 1310.When the locking member 1311 engages with the corresponding locking part 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, press the release member 1312 while holding the handle 136. The release member 1312 pulls the locking member 1311 through the traction rope 1313, and the other end of the locking member 1311 disengages from the locking part 1310. When the locking member 1311 has completely disengaged from the corresponding locking part 1310, the first locking mechanism 131 is in an unlocked state. Then, pull or push the handle 136 to adjust the seat housing 2 to a suitable tilt angle, and then release the release member 1312. The locking member 1311 then engages with the corresponding locking part 1310 under the push of the return spring 1314, positioning the seat housing 2 at the adjusted tilt angle. Referring to Figure 11, the seat housing 2 includes a seat portion 21 and a backrest portion 22 extending upward from the rear end of the seat portion 21. A headrest 23 can be installed on the backrest portion 22. Side impact protection blocks 29 are detachably installed on both sides of the backrest portion 22 (see Figure 1). The seat portion 21 is rotatably mounted to the mounting base 13. Figure 14 shows the axis XX of relative rotation between the seat housing 2 and the mounting base 13, thereby allowing the seat housing 2 to switch to a forward or rearward position. That is, the rotation of the seat housing 2 relative to the mounting base 13 can adjust the orientation of the seat housing 2. Referring to Figures 10 and 14, a rotating mechanism 26 can be installed at the bottom of the seat portion 21, and the seat portion 21 is rotatably connected to the mounting base 13 via the rotating mechanism 26. An axial limiting member 6 can be installed at the bottom of the rotating mechanism 26, and the mounting base 13 and the support frame 19, which are fixed together, are clamped between the seat portion 21 and the axial limiting member 6. In some embodiments, the axial limiting member 6 includes, for example, a disk coaxial with the rotation axis XX, which abuts against the two first crossbars 192 below them, thereby clamping the mounting base 13 and the support frame 19 between the seat portion 21 and the disk 61. Referring again to FIG2, a seat upper limit member 312 is provided on the upper part of the backrest portion 22. When the seat housing 2 is in the forward position, the base upper limit member 311 and the seat upper limit member 312 are engaged, for example, with a clearance fit. It should be noted that when the seat housing 2 is in the forward position, the base upper limit member 311 and the seat upper limit member 312 do not necessarily need to maintain a constant contact with each other. The base upper limit member 311 and the seat upper limit member 312 only need to contact each other when the seat housing 2 is tilted forward relative to the base 1, applying a backward pulling force to the backrest portion 22 of the seat housing 2.This prevents the seat shell 2 from tipping forward relative to the base 1 and potentially injuring a child when the vehicle brakes unexpectedly. In some embodiments, the base upper limit member 311 and the seat upper limit member 312 may have a hook-shaped cross-section and hook together. Of course, the implementation of the base upper limit member 311 and the seat upper limit member 312 is not limited to this. Referring to FIG4, a seat lower limit member 322 is provided on the front side of the back of the rhinoceros portion 21. When the seat shell 2 is in the rearward position, the seat shell 2 rotates relative to the base 1, so that the seat lower limit member 322 is opposite to the base lower limit member 321. At this time, the base lower limit member 321 and the seat lower limit member 322 are engaged, for example, with a clearance fit. It should be noted that when the seat housing 2 is in the rearward position, the lower base limiter 321 and the lower seat limiter 322 do not necessarily need to maintain a constant contact with each other. The lower base limiter 321 and the lower seat limiter 322 only need to contact each other when the seat housing 2 is tilted forward relative to the base 1, applying a rearward pulling force to the lower part 21 of the seat housing 2, thereby preventing the seat housing 2 from tipping forward relative to the base 1. In some embodiments, the lower base limiter 321 and the lower seat limiter 322 may have a hook-shaped cross-section, or hook with each other. More specifically, the first end of the lower seat limiter 322 is located inside the seat housing 2, and the second end of the lower seat limiter 322 forms an engaging hook that extends outward from the inside of the seat housing 2 to engage with the lower base limiter 321. Of course, the implementation of the lower base limiter 321 and the lower seat limiter 322 is not limited to this. Referring to Figure 14, the rotational position of the seat housing 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. The mounting base 13 has at least two locking holes (not shown in the figure) spaced apart in the circumferential direction, and these at least two locking holes are located on the rotational trajectory of the locking member 2131. The locking member 2131 engages with one of the at least two locking holes, thereby positioning the seat housing 2 in a forward or rearward position. The structure of the second locking mechanism 213 will not be described in detail here. Referring to Figure 2, the first end of the top strap 4 can extend into the interior of the base 1 and be fixed. The second end of the top strap 4 can be provided with an anchor 43, which is used, for example, for connecting to 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 Figure 7, in some embodiments, the upper limit member 311 of the base is provided with a support ring 315, and the second end of the top strap 4 passes through the support ring 315 when it extends upward.That is, the support ring 315 is wrapped around the middle of the top strap 4. When the vehicle brakes suddenly, the seat upper limit member 311 tightens the seat upper limit member 312, and the base upper limit member 311 is also tightened by the top strap 4. In this way, the forward tilting force of the seat shell 2 can be transmitted to the vehicle seat through the seat upper limit member 312, the base upper limit member 311, and the top strap 4. In addition, the base upper limit member 311 is simultaneously subjected to two opposite pulling forces, which can cancel each other out and effectively prevent damage to the base upper limit member 311. Figure 15 shows a perspective view of the child safety seat 1000 without the crotch strap assembly 70. The seat 21 is provided with a crotch strap adjustment area 211, which is integrally formed with the seat shell 2, for example. In some alternative embodiments, the crotch strap adjustment area 211 can be a separate structure from the seat shell 2, and the crotch strap adjustment area 211 is attached to the seat shell 2. Referring to Figure 1, in this embodiment, the crotch strap assembly 70 is a double crotch strap structure, including two crotch straps 71 and crotch strap buckles 72 connected to the two crotch straps 71. The crotch strap adjustment area 211 includes two groove-shaped structures 212 spaced apart from each other, and the two groove-shaped structures 212 are symmetrical from left to right. The two groove-shaped structures 212 correspond one-to-one with the two crotch straps 71. Each groove-shaped structure 212 includes two crotch strap holes 2121 arranged sequentially in the front-back direction, and a connecting hole 2122 extending in the front-back direction and communicating with the two crotch strap holes 2121. The crotch strap holes 2121 of the two groove-shaped structures 212 are adjacent to each other, and the connecting holes 2122 of the two groove-shaped structures 212 are far apart from each other. Figure 16 shows an enlarged view of one of the groove-shaped structures 212. The crotch strap hole 2121 is generally rectangular. A first distance T1 in the front-to-back direction corresponds to the width W of the crotch strap 71, and a second distance T2 in the left-to-right direction corresponds to the thickness D of the crotch strap 71. The first distance T1 is greater than the second distance T2. The connecting hole 2122 is generally C-shaped. The connecting hole 2122 includes a first segment 21221 extending in the front-to-back direction and two second segments 21222 extending laterally from the first segment 21221. Each first segment 21222 communicates with the corresponding crotch strap hole 2121. A third distance T3 in the front-to-back direction corresponds to the thickness D of the crotch strap 71. Figure 17 shows a bottom view of the seat housing 2. To avoid showing the internal structure of the seat housing 2, some parts of the housing structure of the seat housing 2 and the rotating mechanism 26 for connection with the mounting base 13 are omitted in Figure 17.Referring to Figures 1 and 17, the first end 711 of each crotch strap 71 is fixed below the crotch strap adjustment area 211. The middle portion of each crotch strap 71 selectively enters either crotch strap hole 2121 via the connecting hole 2122 as needed. The second end of each crotch strap 71 is connected to the crotch strap buckle 72 above the crotch strap adjustment area 211. The crotch strap buckle 72 can be detachably fastened to the shoulder strap buckle 75 (see Figure 19), which is connected to the shoulder strap 76. Referring again to Figure 1, in some embodiments, the second ends of two crotch straps 71 are connected as one unit and connected to the crotch strap buckle 72; that is, the two crotch straps 71 are formed from different parts of the same webbing. More specifically, the crotch strap buckle 72 has a hole 720. The same webbing passes through the hole 720 and is bent. The webbing on one side of the hole 720 forms a crotch strap 71, and the webbing on the other side of the hole 720 forms another crotch strap 71. In some alternative embodiments, the two crotch straps 71 can be a separate structure, with the second ends of the two crotch straps 71 respectively connected to different connecting holes of the crotch strap buckle 72. In Figure 1, the two crotch straps 71 are respectively passed through the forward crotch strap hole 2121. At this time, the distance between the crotch strap 71 and the backrest 22 is larger, which allows larger children to sit in the seat 2L. When it is necessary to adjust the position of each crotch strap 71, each crotch strap 71 can be twisted and inserted into the connecting hole 2122, and then slid along the connecting hole 2122 into the rear crotch strap hole 2121. After each crotch strap 71 is fully inserted into the rear crotch strap hole 2121, adjust the position of the crotch strap 71 in the crotch strap hole 2121 so that the width direction of the crotch strap 71 adapts to the front-back direction of the crotch strap hole. When the two crotch straps 71 are respectively inserted into the rear crotch strap hole 2121, the distance between the crotch strap 71 and the backrest 22 is smaller, which allows smaller children to sit in the seat 21. Referring again to Figure 17, in some embodiments, the crotch strap adjustment area 211 is also provided with a reinforcing plate 275, which can be fixed to the seat housing 2 by fasteners such as screws. More specifically, the reinforcing plate 275 can be located on the back of the crotch strap adjustment area 211, and the reinforcing plate 275 has a groove 2751 that matches the groove structure 212. By providing the reinforcing plate 275, the structural strength of the crotch strap adjustment area 211 can be enhanced. In some embodiments, the seat housing 2 includes two foot posts 218 located below the crotch belt adjustment area 211, the foot posts 218 being integrally formed with the seat housing 2, for example, but not limited to.The first ends 711 of the two crotch straps 71 can be sewn together to form loops, which can be fitted onto the corresponding positioning posts 218 to position the first ends 711 of each crotch strap 71. Of course, in some alternative embodiments, the first ends of the crotch straps 71 can also be fixed by any suitable method. In some embodiments, the seat housing 2 can also be provided with a positioning post 218, with the lower ends of each crotch strap 71 connected to the same positioning post 218. In some embodiments, the lower ends of the positioning post 218 are tilted rearward to reduce the turning angle of the portion of each crotch strap located between the positioning post 218 and the crotch strap hole 2121. Continuing to refer to Figure 17, the fixed position of the first ends 711 of the crotch strap 71 (i.e., the position where the crotch strap 71 is connected to the positioning post 218) is closer to the foremost crotch strap hole 2121 and farther away from the rearmost crotch strap hole 2121. Thus, when the crotch strap 71 passes through the crotch strap holes 2121 at different positions, the length of the crotch strap 71 exposed from the seat housing 2 can be adjusted, eliminating the need for an adjuster to adjust the length of the crotch strap 71. More specifically, when the crotch strap 71 passes through the foremost crotch strap hole 2121, the exposed length of the crotch strap 71 is the longest, meeting the needs of larger children. When the crotch strap 71 passes through the rearmost crotch strap hole 2121, the exposed length of the crotch strap 71 is the shortest, meeting the needs of smaller children. The scheme for adjusting the fore-and-aft position and exposed length of the crotch strap 71 provided by the embodiments of this disclosure has the advantages of simple structure, few parts, and ease of use. Figure 18 shows another bottom view of the seat housing 2. To facilitate showing the internal structure of the seat housing 2, some shell structures of the seat housing 2 and the rotating mechanism for connecting to the mounting base 13 are omitted in Figure 18. The lower seat limiter 322 can be fixed to the positioning post 218 by fastener 2181, which can prevent the first end 711 of the crotch strap 71 from accidentally falling off the positioning post 218. More specifically, the first end of the lower seat limiter 322 is fixed to the positioning post 218. By fixing both the first end 711 of the crotch strap 71 and the lower seat limiter 322 to the positioning post 218, the structure is simplified. Of course, in other embodiments, the crotch strap 71 can also restrict the movement of its first end 711 along the positioning post 218 by other structures. Figures 19 and 20 show a partial structure of the seat housing 2. The stop surface of the seat housing 2 can be covered with a fabric layer 28, and the fabric layer 28 has an opening 280 at the position corresponding to the crotch strap adjustment area 211. The opening 280 can be covered by a flap 281.The flap 281 is generally rectangular. The rear edge 2811 of the flap 281 is sewn to the fabric layer 28, for example. The front edge of the flap 281 and the fabric layer 28 are detachably connected by a fastening mechanism. The fastening mechanism includes, for example, a first positioning member 282 fixed to the flap 281 and a second positioning member 283 fixed to the fabric layer 28. The first positioning member 282 and the second positioning member 283 can be mutually engaging components such as Velcro or snaps. The flap 281 can pass between the two hip straps 71, connecting the first positioning member 282 and the second positioning member 283, thereby covering the opening 280. When the flap 281 covers the opening 280, gaps are formed between the left and right side edges of the flap 281 and the fabric layer 28 for the hip straps 71 to pass through. In some embodiments, the flap 281 itself forms the gaps for the hip straps 71 to pass through. In some embodiments, the interior of the flip cover 281 may be provided with a rigid plate 284, which may be, but is not limited to, a plastic plate. In some alternative embodiments, the various groove structures 212 may also have other implementations. For example, each slotted structure 212 may include two or more strap holes 212" and the connecting hole 2122 correspondingly includes one or more second segments 21222. The first segment 21221 communicates with multiple strap holes 2121 through multiple second segments 21222, allowing each strap 71 to enter any strap hole 2121 as needed. Figure 21 shows an alternative embodiment of the slotted structure 212. Unlike the slotted structure 212 shown in Figure 15, the connecting holes 2122 of the two slotted structures 212 are adjacent to each other, and the strap holes 2121 of the two slotted structures 212 are far apart from each other. After the two straps 71 have moved into the appropriate strap holes 2121, the flip cover 281 is closed. The flip cover 281 and its internal rigid plate 284 can help prevent the straps 71 from accidentally moving from the strap holes 2121 into the connecting holes 2122. Referring again to Figure 21, in some embodiments, A protrusion 2123 is provided at the junction of the crotch strap hole 2121 and the connecting hole 2122. This protrusion 2123 can reduce the diameter of the hole at the junction of the crotch strap hole 2121 and the connecting hole 2122, and can also prevent the crotch straps 71 from accidentally moving from the crotch strap hole 2121 into the connecting hole 2122. Figure 22 shows another alternative embodiment of the groove structure 212, which is a variation of the groove structure 212 shown in Figure 21. More specifically, the first segment 21221 of the connecting hole 2122 of the two groove structures 212 is shared, which further simplifies the structure of the groove structure 212.Figure 23 illustrates another alternative embodiment of the groove structure 212. Unlike the groove structure shown in Figure 16, the three belt holes 2121 are arranged at intervals in the front-back direction. The first distance T1 of the belt holes 2121 in the front-back direction corresponds to the thickness D of the belt 71, and the second distance T2 of the belt holes 2121 in the left-right direction corresponds to the width W of the belt 71. The first distance T1 is less than the second distance T2. A connecting hole 2122 is located at one end of each belt hole 2121. The connecting hole 2122 includes a first segment 21221 extending in the front-back direction and two second segments 21222 extending laterally from the first segment, each second segment 21222 communicating with the corresponding belt hole 2121. The second distance T3 in the front-to-back direction corresponds to the thickness D of the crotch strap 71. A protrusion 2123 is provided at the junction of the crotch strap hole 2121 and the connecting hole 2122. Figure 24 shows another alternative embodiment of the groove structure 212. The groove structure 212 shown in Figure 24 is a variation of the groove structure 212 shown in Figure 23. More specifically, the connecting hole 2122 is located in the middle of each crotch strap hole 2121 and extends in the front-to-back direction, connecting each crotch strap hole 2121. The crotch strap assembly 70 described above is an example of a double crotch strap structure. It should be noted that the groove structure 212 provided in the embodiments of this disclosure is also applicable to the crotch strap assembly 70 with a single crotch strap structure. Figure 25 shows the crotch strap assembly 70 with a single crotch strap structure. Specifically, the crotch strap assembly 70 includes a single centrally located crotch strap 71. The groove structure 212 shown in the above embodiments can be provided on the crotch strap adjustment area 211 of the seat housing 2. The position of the crotch strap 71 is adjusted. The flip cover 281 can be formed with a groove structure 2810 that matches the groove structure 212. The groove structure 212 in FIG25 is specifically exemplified by the groove structure 212 shown in FIG24. Second Embodiment FIG26 to FIG28 show views of the child safety seat 1000 provided according to the second embodiment of the present disclosure from different perspectives. The child safety seat 1000 of this embodiment is a variant embodiment of the child safety seat 1000 of the first embodiment described above. Unless otherwise specified, the structure of the child safety seat 1000 of this embodiment can refer to the description in the first embodiment described above. It should be particularly noted that in the second embodiment and the variants of the second embodiment below, the base housing 10 may include a plurality of rigid housings that surround the outer shape of the base housing 10, and may also include metal connectors installed in the rigid housings, which are not particularly limited here.In Figures 26 and 27, the seat housing 2 is in a forward-facing position, and the tilt angle of the seat housing 2 relative to the base 1 is different. In Figure 28, the seat housing 2 is in a rearward-facing position. As described in the aforementioned embodiment, when the seat housing 2 is in the rearward-facing position, the tilt angle of the seat housing 2 relative to the base 1 can also be adjusted. Figure 29 shows a perspective view of the child safety seat 1000 without the base housing 10, and Figure 30 shows a bottom view of the seat housing 2. Figure 31 shows a top view of the mounting base 13. The top view of the base housing 10 in this embodiment can be referred to Figure 9. Figure 32 shows a schematic diagram of a cross-section along U5-U5 in Figure 30. Figure 33 shows an incomplete exploded view of the mounting base 13. Figure 34 shows a schematic diagram of a cross-section along U4-U4 in Figure 29. Figures 35 and 36 show schematic diagrams of the cross-section along U3-U3 of Figure 29, where the first locking mechanism 131 in Figure 35 is in a locked state and the first locking mechanism 131 in Figure 36 is in an unlocked state. This 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 component 13A, an unlocking component 1312, a traction rope 1313, a return spring 1314, a drive pin 1315, a return spring 1316, and a return spring 1319. Referring to Figures 31 and 33, the locking component 13A includes a locking component 1311, a drive block 1317, and a connecting pin 1318. The locking component 13A and the return spring 1314 are mounted on the mounting base 13. Referring to Figures 30, 32, and 34, the release element 1312, the traction rope 1313, the drive pin 1315, the return spring (also referred to as the first return spring) 1316, and the return spring 1319 are mounted on the seat housing 2, and more specifically, on the seat portion 21 of the seat housing 2. Referring to Figures 31 and 33, in some embodiments, the mounting base 13 includes an upper housing 1301 and a lower housing 1302. The periphery of the upper housing 1301 and the periphery of the lower housing 1302 can be connected, for example, by a fastener 13015. A receiving cavity 1300 is formed between the upper housing 1301 and the lower housing 1302. The upper housing 1301 defines a stepped hole 13010, and the rotating structure 26 of the seat portion 21 is pivotally connected to the hole 13010. Hole 13010 has a bottom wall 13012, and a fourth hole 13013 is provided on the bottom wall 13012. The driving block 1317 is slidably engaged with the fourth hole 13013.The sliding direction of the drive block 1317 is parallel to the axis XX, that is, the drive block 1317 can slide axially. The rear of the lower housing 1302 has a groove 13026 that mates with the arm 1962 of the fixed seat 196 (see FIG. 7), and a hole 13027 for fasteners 1968 (see FIG. 8) to pass through. The bottom of the lower housing 1302 has an annular protrusion 13021, which has a central hole 130210 that pivotally engages with the rotary structure 26. The annular protrusion 13021 has a bottom wall 13022 and a peripheral wall 13023. The bottom wall 13022 is located to the left of the bottom wall 13012, and multiple fasteners pass through the mounting holes 131a of the bottom wall 13012 and the bottom wall 13022 to connect to the first crossbar 192 of the support frame 19. A hole 1303 is provided on the peripheral wall 13023, and the locking member 1311 slides in the hole 1303. The sliding direction of the locking member 1311 is perpendicular to the axis XX, that is, the locking member 1311 can slide radially. Similar to the first embodiment, on the one hand, the locking foot member 1311 can extend out of the receiving cavity 1300 through the hole 1303 to engage with the corresponding locking part 1310 (see Figure 9), so that the first locking mechanism 131 is in a locked state. On the other hand, the locking member 1311 can retract into the receiving cavity 1300 through the hole 1303 to exit from the locking part 1310, so that the first locking mechanism 131 is in an unlocked state. The driving block 1317 is operably connected to the locking member 1311, so that the axial movement of the driving block 1317 can drive the locking member 1311 to move radially. In some embodiments, the drive block 1317 may be provided with an elongated hole 13172, and the locking member 1311 is slidably engaged with the elongated hole 13172. An oblique hole 13171 is provided on the wall of the elongated hole 13172, and a connecting pin 1318 is disposed on the locking member 1311, and the connecting pin 1318 is slidably engaged with the oblique hole 13171. When the drive block 1317 slides axially upwards, the wall of the oblique hole 13171 pushes the connecting pin 1318 to extend or retract radially. Of course, in some alternative embodiments, the drive block 1317 may also push the locking member 1311 to move through other structures. Of course, in some embodiments, the positions of the oblique hole and the connecting pin on the locking member 1311 and the drive block 1317 may be interchanged. The return spring 1314 applies force to the locking member 1311, causing the locking member 1311 to move toward the locking part 1310 to engage with the locking part 1310.In this embodiment, the bottom of the drive block 1317 has a receiving groove 13170. One end of the return spring 1314 extends into the receiving groove 13170 to abut against the drive block 1317, and the other end of the return spring 1314 abuts against the wall 1304 located to the left of the drive block 1317. The return spring 1314 applies an upward axial force to the drive block 1317, and the movement of the drive block 1317 drives the locking member 1311 to move towards the locking part 1310. Referring to Figures 30, 32 and 34, the release member 1312 can be installed at the front of the seat housing 2, more specifically, at the front of the back of the seat part 21. For example, a mounting groove 2110 is provided at the front of the back of the seat part 21, and the release member 1312 is slidably installed in the mounting groove 2110. A second hole 2101 is also provided on the back of the seat 21. When the seat housing 2 is in the forward or rearward position, the second hole 2101 is located above and opposite to the fourth hole 13013. The drive pin 1315 is slidably engaged with the second hole 2101, and the sliding direction of the drive pin 1315 is parallel to the T-axis, that is, the drive pin 1315 can slide axially. The release element 1312 is operably connected to the drive pin 1315 via a traction rope 1313. Referring to Figures 32 and 34, the traction rope 1313 extends inside the seat housing 2. The first end 13131 of the traction rope 1313 is operably connected to the release element 1312, and the second end 13132 of the traction rope 1313 is connected to the drive pin 1315. When the seat housing 2 is in the forward or rearward position and the release element 1312 is pressed, the first end 13132 of the traction rope 1313 can pull the drive pin 1315 downward, and the lower end of the drive pin 1315 further pushes the drive block 1317 downward. When the pressing force applied to the release element 1312 is removed, the return spring 1316 applies an upward force to the drive pin 1315, and the return spring 1319 applies a reset force to the release element 1312. Referring to Figure 32, the second end 13132 of the traction rope 1313 extends upward and connects to the drive pin 1315, thus, when the traction rope 1313 is under force, it drives the drive pin 1315 downward. To facilitate the connection of the traction rope 1313 and the drive pin 1315, a connecting seat 13151 can be fixed to the upper end of the drive pin 1315. The connecting seat 13151 extends laterally from the drive pin 1315 and connects to the second end 13132 of the traction rope 1313. The connecting seat 13151 and the drive pin 1315 can be separate structures or integrated structures.Additionally, the seat housing 2 may also be equipped with a steering wheel 13133, which is located below the connecting seat 13151. The second end 13132 of the traction rope 1313 passes over the steering wheel 13133 and extends upward to connect with the connecting seat 13151. In some embodiments, the connecting seat 13151 and the fixing seat 13152 are slidably engaged, and the fixing seat 13152 is installed at the bottom of the seat portion 21 of the seat housing 2. The process of adjusting the tilt angle of the child safety seat housing 2 provided in this embodiment will be described below with reference to Figures 34 to 36. When it is necessary to adjust the tilt angle of the seat housing 2, insert your hand into the mounting groove 2110 and press the release member 1312. Referring to Figure 36, the release element 1312 pulls the drive pin 1315 downward via the traction rope 1313. The drive pin 1315 pushes the drive block 1317 downward. Under the action of the inclined hole 13171 and the connecting pin 1318, the locking element 1311 retracts and exits from the locking part 1310. At this time, by holding the wall of the mounting groove 2110 and pulling or pushing the seat shell 2, the tilt angle of the seat shell 2 can be adjusted. After the seat shell 2 is adjusted to a suitable tilt angle, the release element 1312 is released, and the release element 1312 is reset under the push of the return spring 1319. Referring to Figure 35, the drive pin 1315 moves upward under the push of the return spring 1316, and the drive block 1317 moves upward under the push of the return spring 1314. Under the action of the oblique hole 13171 and the connecting pin 1318, the locking member 1311 extends out and engages with the corresponding locking part 1310, thereby positioning the seat housing 2 at the adjusted tilt angle. In this embodiment, the mounting base 13 can omit the handle 136 of the first embodiment. In addition, as can be seen from Figure 35, when it is not necessary to adjust the tilt angle of the seat housing 2, that is, when the release member 1312 is not pressed, the drive pin 1315 is received in the second hole 2101 of the seat housing 2 and does not extend into the fourth hole 13013, and the drive block 1317 does not extend into the third hole 2101. Therefore, neither the drive pin 1315 nor the drive block 1317 will interfere with the rotation of the seat housing 2 relative to the mounting base 13. In some embodiments, the seat housing 2 can be locked in a forward or rearward position by means of the second locking mechanism 213 in the first embodiment.According to Figures 35 and 36, the first locking mechanism 131, when the seat housing 2 is in the forward or rearward position, the drive pin 1315 is opposite to the fourth hole 13013, allowing the drive pin 1315 to move axially to push the locking member 1311 out of the locking part 1310 via the drive block 1317, thereby allowing adjustment of the tilt angle of the seat housing 2. When the seat housing 2 is in other positions (e.g., the lateral position), the tilt angle of the seat housing 2 cannot be adjusted because the drive pin 1315 and the drive block 1317 are misaligned. This effectively avoids the problem that adjusting the tilt angle when the seat housing 2 is in the lateral position, but the adjusted tilt angle makes it uncomfortable for children to sit in when the seat housing 2 is rotated to the forward or rearward position. Figures 37 to 40 show a variant embodiment of the first locking mechanism 131 provided in the second embodiment of this disclosure. As shown in Figure 37, the third hole 2101 has a stepped hole (also called a stepped hole, or K-joint) 2101L. Hole 21011 is used to accommodate the upper end of the drive block 1317. When the seat housing 2 is in the forward or rearward position and the release member 1312 is not pressed, the upper end of the drive block 1317 extends into the hole 21011 and engages with the hole 21011. At this time, the drive block 1317 locks the rotation of the seat housing 2 relative to the mounting base 13. In addition, the locking member 1311 extends and engages with the corresponding locking part 1310, and the tilt angle of the seat housing 2 is also locked. Referring to Figures 38 and 40, when the seat housing 2 is in the forward or rearward position, the external release force presses the release member 1312 along direction P to move it a first stroke L1. At this time, the release element 1312 drives the drive pin 1315 downward via the traction rope 1313, and the drive pin 1315 is not inserted into the fourth hole 13013. The drive block 1317 is pushed downward by the drive pin 1315 and exits the hole 21011. At this time, the drive block 1317 cannot lock the rotation of the seat housing 2 relative to the mounting base 13, and the orientation of the seat housing 2 can be adjusted as needed. When the seat housing 2 rotates and the drive pin 1315 and the drive block 1317 are misaligned, the drive block 1317 is pressed against the wall of the seat housing 2 and is held in the fourth hole 13013, and will not protrude relative to the fourth hole 13013; and the drive pin 1315 is pressed against the wall of the mounting base 13 and is held in the second hole 2101, and will not protrude relative to the hole 21011, so as not to interfere with the rotation of the seat housing 2.Furthermore, although the locking member 1311 retracts under the drive of the drive block 1317, a portion of the locking member 1311 remains engaged with the corresponding locking part 1310, and the tilt angle of the seat housing 2 remains locked. Optionally, the lower edge of the hole 21011 is provided with a guide slope (as shown in Figure 41 in the direction away from the paper), so that when the drive pin 1315 has not completely pushed the drive block 1317 out of the hole 21011, the drive block 1317 can be pushed out of the hole 21011 by rotating the seat housing 2, thereby increasing the fault tolerance of the unlocking operation of the unlocking member 1312. Referring to Figures 39 and 40, when the seat housing 2 is in the forward or rearward position, the release lock 1312 moves a first stroke L2 along direction P, where the first stroke L2 is greater than the first stroke L". At this time, the release lock 1312 drives the drive pin 1315 downward via the traction rope 1313, and the drive pin 1315 inserts into the fourth hole 13013 of the mounting base 13. The drive block 1317 is pushed downward by the drive pin 1315 and holds the exit hole 21011. At this time, the cooperation between the drive pin 1315 and the fourth hole 13013 restricts the rotation of the seat housing 2 relative to the mounting base 13, preventing adjustment of the seat housing 2's orientation. The locking member 1311 completely exits the corresponding locking part 1310 under the drive of the drive block 1317, at which point the tilt angle of the seat housing 2 can be adjusted. Referring to Figure 40, in some embodiments, the return spring 1319 is installed in the mounting groove 2110. The return spring 1319 remains in contact with the release member 1312 to drive the release member 1312 to reset. Alternatively, a damping spring 13109 can be installed in the mounting groove 2110. When the release member 1312 moves within the first stroke L1 range, the damping spring 13109 can apply almost no damping force to the release member 1312. When the movement of the release member 1312 exceeds the first stroke L1, the damping spring 13109 applies a damping force to the release member 1312. This helps the user determine whether the release member 1312 has moved to the first stroke L1 by sensing the difference in resistance. Of course, there are many other ways to determine whether the release member 1312 has moved to the first stroke L1. In some alternative embodiments, a boss (not shown in the figure) can be provided on the groove wall of the mounting groove 2110 at a position corresponding to the first stroke L1. When the release member 1312 moves to the boss, The user can determine that the release element 1312 has moved the first stroke L by observing the sudden increase in resistance. When it is necessary to continue moving the release element 1312, the user can apply force to make the release element 1312 pass over the boss.It is understood that the design of the four units should not affect the reset spring 1319 pushing the release member 1312 to reset. Figures 41 and 42 show another variation of the first locking mechanism 131 provided in the second embodiment of this disclosure. As shown in Figure 41, the second hole 2101 has a hole 21011 for receiving the drive block 1317. When the seat housing 2 is in the forward or rearward position and the release member 1312 is pressed, the upper end of the drive block 1317 extends upward into the hole 21011, at which time the drive block 1317 is in the first position. At this time, the drive block 1317 locks the rotation of the seat housing 2 relative to the mounting base 13. In addition, the locking member 1311 extends and engages with the corresponding locking part 1310, and the tilt angle of the seat housing 2 is also locked. Referring to Figure 42, when the seat housing 2 is in the forward or rearward position, pressing the release member 1312 causes the release member 1312 to move the drive pin 1315 downward via the traction rope 1313, and the drive pin 1315 is not inserted into the fourth hole 13013. The drive block 1317 is pushed downward by the drive pin 1315 and exits the hole 21011. At this time, the drive block 1317 no longer locks the rotation of the seat housing 2 relative to the mounting base 13, and the orientation of the seat housing 2 can be adjusted as needed. At the same time, the locking member 1311 is completely disengaged from the corresponding locking part 1310 under the drive of the drive block 1317. At this time, the drive block 1317 is in the second position, and the user can simultaneously adjust the tilt angle and orientation of the seat housing 2. When the first locking mechanism 131 is implemented in the manner shown in Figures 37 to 42, the first locking mechanism 213 for positioning the orientation of the seat housing 2 shown in Figure 14 can be omitted. Alternatively, in the embodiments shown in Figures 37 to 42, the locking member 1311 can be referred to as part of the first locking mechanism, and the driving block 1317, driving pin 1315, and releasing member 1312 can be referred to as part of the second locking mechanism. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The above embodiments only illustrate several implementation methods of this disclosure, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure.Therefore, the scope of protection of this disclosed patent shall be determined by the appended claims.

Claims

Claims 1. A child safety seat, comprising: Seat shell; The base includes a base housing and a mounting base. The seat housing is rotatably mounted to the mounting base, and the mounting base is slidably mounted to the base housing. The base housing is provided with multiple locking parts. The first locking mechanism includes: a drive pin disposed on the seat housing; a release member disposed on the seat housing, the release member being operably connected to the drive pin; and a locking assembly disposed on the mounting base, the locking assembly including a locking member selectively engaging with the plurality of locking portions to lock the sliding of the seat housing; wherein the drive pin is operably connected to the locking assembly for driving the locking member to disengage from the corresponding locking portion.

2. The child safety seat according to claim 1, characterized in that: The seat housing is provided with a third hole, and the drive pin is slidably engaged with the third hole; the locking assembly includes a drive block, and the drive block is operably connected to the locking member; The mounting base is provided with a fourth hole, and the drive block is slidably engaged with the fourth hole; when the seat housing is in the forward or rearward position, the second hole is aligned with the fourth hole, and when the unlocking member is subjected to an external unlocking force, the drive pin is driven to push the drive block downward, so that the drive block drives the locking member to disengage from the corresponding locking part.

3. The child safety seat according to claim 2, characterized in that: The upper end of the drive pin is fixed with a connecting seat, the lower end of the drive pin is used to push against the drive block, and the connecting seat extends laterally from the upper end of the drive pin; the seat shell may also be equipped with a steering wheel, the steering wheel is located below the connecting seat; the first locking mechanism also includes a traction rope, the first end of the traction rope is operably connected to the release member, and the second end of the traction rope extends upward after passing over the steering wheel to connect with the connecting seat.

4. The child safety seat according to claim 2, characterized in that, One of the locking member and the driving block is provided with an oblique hole, and the other of the locking member and the driving block is provided with a connecting pin. The connecting pin slides with the oblique hole to allow the locking member to engage with or disengage from the locking part.

5. The child safety seat according to claim 1, characterized in that: The locking mechanism further includes a first return spring for driving the drive pin to reset; when the pressing force applied to the release member is removed, the first return spring applies an upward force to the drive pin.

6. A child safety seat, characterized in that, include: Seat shell; The base includes a base housing and a mounting base, wherein the seat housing is rotatably mounted to the mounting base, and the mounting base is slidably mounted to the base housing. A first locking mechanism is used to operably lock the sliding between the mounting base and the base housing; The first locking mechanism includes a second locking mechanism for operably locking rotation between the seat housing and the mounting base; wherein the first locking mechanism includes: a plurality of locking parts disposed on the base housing; and a locking member movably disposed on the mounting base, capable of selectively engaging with the plurality of locking parts to lock sliding of the seat housing; wherein the second locking mechanism includes: A locking portion is disposed on the seat housing; and a drive block is movably disposed at the mounting seat and operably locked onto the locking portion; when the drive block engages with the hole, the first locking mechanism locks the rotation between the seat housing and the mounting seat; wherein, the drive block cooperates with the locking member, and when the drive block disengages from the locking portion, the drive block drives the locking member to release the lock between itself and the locking portion.

7. The child safety seat according to claim 6, characterized in that: The first locking mechanism further includes: a drive pin movably disposed within the engaging portion; and a release member disposed in the seat housing, capable of driving the drive pin to move so as to push the drive block away from the engaging portion by the drive pin.

8. The child safety seat according to claim 7, characterized in that: The unlocking member has a first stroke and a second stroke; when the unlocking member moves the first stroke, the drive block disengages from the engaging part to unlock the rotation between the seat housing and the mounting base; When the unlocking member moves to the second stroke, the drive pin extends into the mounting base to lock the sliding between the seat housing and the mounting base, and the drive block drives the locking member to disengage from the locking part to unlock the sliding between the mounting base and the base housing.

9. The child safety seat according to claim 7, characterized in that: The drive block is movably disposed at the mounting base and has a first position and a second position; The locking member can drive the drive block to move between the first position and the first position, wherein when the drive block moves to the first position along the first direction, the rotation between the seat housing and the mounting base is locked, and the sliding between the mounting base and the base housing is locked by the locking member; wherein when the drive block moves to the second position along the second direction, the rotation between the seat housing and the mounting base is released, and the sliding between the mounting base and the base housing is released by the locking member.

10. A child safety seat, characterized in that, include: Seat shell; The base includes a base housing and a mounting base, wherein the seat housing is rotatably mounted to the mounting base, and the mounting base is slidably mounted to the base housing. A drive block, which is movably disposed at the mounting base, and has a first position and a second position; A locking element, which is driven by the drive block to move between a locked position and an unlocked position; And a locking element, disposed at the seat housing, capable of driving the drive block to move between the first position and the second position, wherein, when the drive block moves along the first direction to the first position, the rotation between the seat housing and the mounting base is locked, and the sliding between the mounting base and the base housing is locked by the locking element; wherein, when the drive block moves along the second direction to the second position, the rotation between the seat housing and the mounting base is released, and the sliding between the mounting base and the base housing is released by the locking element.

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