Child safety seat

Abstract

This invention relates to a seat adjustment system for a child safety seat, comprising: a seat plate having at least one first connecting portion; and a base having at least one second connecting portion cooperating with the at least one first connecting portion, the seat plate being slidably connected to the base via the cooperation of the first and second connecting portions. The seat plate has at least one first adjustment portion, and the base has at least one second adjustment portion and at least one third adjustment portion. The first and second adjustment portions cooperate to lock the seat plate in a first position; and the first and third adjustment portions cooperate to lock the seat plate in a second position. The seat plate is lockably slidable relative to the base between the first and second positions, and the seat length of the child safety seat is less when the seat plate is in the first position than the seat length of the child safety seat when the seat plate is in the second position.

Description

[Technical Field]

[0001] This invention relates to the field of child safety seat technology, and more particularly to a seat adjustment system, an ISOFIX safety release system, and a child safety seat. [Previous Technology]

[0002] To ensure ease of use and extend the lifespan of their use, child safety seats are typically designed to be suitable for children of a certain age. However, the vast majority of current child safety seats have a fixed seat length, which makes it difficult to accommodate children of various body types, thus reducing the comfort of the child safety seat.

[0003] In the event of a traffic accident, the backrest of a child safety seat may be pressed forward. At this time, the parts of the backrest that are in contact with the base (e.g., the armrests on the base) will deform outward in the lateral direction under pressure. That is, the two sides of the backrest will open outward, so that the base can no longer support the two sides of the backrest, causing the backrest to continue to be pressed forward.

[0004] The ISOFIX anchoring system is an internationally recognized connection system for child safety seats. Generally, the ISOFIX anchoring system includes an ISOFIX connector installed on the child safety seat and an ISOFIX interface installed on the vehicle seat. The connection and removal of the two are very convenient, bringing great convenience to the user.

[0005] However, due to the ease of disassembly of ISOFIX restraint systems, there is a safety hazard of accidental release. In particular, to facilitate user operation of the ISOFIX restraint system, the release mechanism is generally located in an easily accessible position on the child safety seat, which further increases the possibility of accidental release due to accidental activation. For example, the ISOFIX restraint system may be accidentally released due to accidental activation by a child in the child safety seat. [Summary of the Invention]

[0006] Based on this, it is necessary to address the above-mentioned technical problems by providing a seat adjustment system, an ISOFIX safety release system, and a child safety seat. The seat adjustment system and child safety seat allow for easy adjustment of the seat length to accommodate children of various sizes. The ISOFIX safety release system and child safety seat retain the ease of disassembly of the ISOFIX system while preventing accidental release due to accidental activation.

[0007] To achieve the above objectives, according to one aspect of the present invention, an embodiment of the present invention provides a seat adjustment system for a child safety seat, comprising: a seat plate having at least one first connecting portion; and a base having at least one second connecting portion cooperating with the at least one first connecting portion, wherein the seat plate is slidably connected to the base via the cooperation of the first and second connecting portions. The seat plate has at least one first adjustment portion, and the base has at least one second adjustment portion and at least one third adjustment portion. The first adjustment portion cooperates with the second adjustment portion to lock the seat plate in a first position; and the first adjustment portion cooperates with the third adjustment portion to lock the seat plate in a second position. The seat plate is lockably slidable relative to the base between the first and second positions, and the seat length of the child safety seat is less when the seat plate is in the first position than the seat length of the child safety seat when the seat plate is in the second position.

[0008] According to another aspect of the present invention, embodiments of the present invention also provide a seat adjustment system for a child safety seat. The seat adjustment system includes a seat and a base, the seat being movable relative to the base along a first direction between a first position and a second position. The seat further includes: an adjustment portion operably restricting movement of the seat relative to the base along the first direction; a connecting portion restricting movement of the seat relative to the base along a second direction perpendicular to the first direction; and a first through hole for threading a crotch strap. The base includes a second through hole for threading a crotch strap. Wherein, when the seat is in the first position, the projection of the second through hole in the vertical direction does not coincide with the projection of the first through hole in the vertical direction; when the seat is in the second position, at least a portion of the projection of the second through hole in the vertical direction coincides with the projection of the first through hole in the vertical direction.

[0009] According to another aspect of the present invention, an embodiment of the present invention provides a child safety seat comprising: a base having an armrest; and a backrest. The armrest has a first surface on the side facing the backrest, and the backrest has a second surface on the side facing the armrest. The first surface and the second surface are disposed opposite to each other. At least one of the first surface and the second surface is provided with a limiting mechanism, the limiting mechanism being configured to provide resistance preventing the second surface from sliding laterally relative to the first surface when the first surface contacts the second surface.

[0010] According to another aspect of the present invention, embodiments of the present invention also provide an ISOFIX safety release system for a child safety seat. The ISOFIX safety release system includes: an ISOFIX connector capable of switching between a locked state and an unlocked state; a first release device operably connected to the ISOFIX connector; the first release device includes a first release operating part slidable between a locked position and an unlocked position; when the first release operating part switches from the locked position to the unlocked position, the first release device switches the ISOFIX connector from the locked state to the unlocked state; and a second release device operably connected to the first release device; the second release device includes a second release operating part slidable between a secured position and a free position; when the second release operating part is in the secured position, the second release device locks the first release operating part in the locked position; wherein the sliding direction of the first release operating part is not parallel to the sliding direction of the second release operating part.

[0011] According to another aspect of the present invention, embodiments of the present invention also provide an ISOFIX safety release system for a child safety seat. The ISOFIX safety release system includes: an ISOFIX connector capable of switching between a locked state and an unlocked state; a first release device operably connected to the ISOFIX connector; the first release device includes a first release operating part slidable between a locked position and an unlocked position; when the first release operating part switches from the locked position to the unlocked position, the first release device switches the ISOFIX connector from the locked state to the unlocked state; and a second release device operably connected to the first release device; the second release device includes a second release operating part slidable between a secured position and a free position; when the second release operating part is in the secured position, the second release device locks the first release operating part in the locked position; wherein the unlocking sliding direction of the first release operating part and the unlocking sliding direction of the second release operating part are opposite to each other.

[0012] According to another aspect of the present invention, embodiments of the present invention also provide a child safety seat, including: the ISOFIX safety release system described in the above embodiments.

[0013] According to the ISOFIX safety release system described above, the second release operation part must be adjusted to the free position before the first release operation part can be slid to the release position to prevent accidental release caused by children touching the first release operation part at will.

Implementation Method

[0015] To facilitate understanding of the present invention, a more complete description of the invention will now be given with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0016] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used herein are for illustrative purposes only.

[0017] It should be noted that in the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "level", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] Referring to Figures 1 to 3, in one embodiment of the present invention, the child safety seat 1 includes a seat adjustment system 10, which includes a seat 100 and a base 110. The seat 100 is slidably connected to the upper surface of the base 110, and the seat 100 is slidable relative to the base 110 between a first position and a second position. Referring also to Figures 2 and 3, in the child safety seat 1 shown in Figure 2, the seat 100 is in the first position. At this time, the total seat cushion length of the child safety seat 1 is relatively short, suitable for children aged, for example, 3-5 years old. The seat 100 shown in Figure 2 slides forward along the D1 direction to enter the second position (as shown in Figure 3). At this time, the total seat cushion length of the child safety seat 1 is relatively long, suitable for children aged, for example, 6-12 years old. Similarly, the seat 100 shown in Figure 3 slides backward along the D2 direction, opposite to the D1 direction, to enter the first position (as shown in Figure 2). In this invention, direction D1 is defined as the "forward" direction, and direction D2 is defined as the "rear" direction. "Forward" as mentioned below refers to direction D1, and "rear" refers to direction D2. The direction perpendicular to both the sliding direction and the vertical direction is the lateral direction. In the first position, the front end of the seat 100 is approximately flush with the front end of the base. In the second position, the front end of the seat 100 extends beyond the front end of the base. Therefore, the length of the child safety seat 1 in the first position is less than the length of the child safety seat 1 in the second position.

[0020] Referring to Figures 4A and 5, Figure 4A is a structural schematic diagram of a seat plate according to an embodiment of the present invention, and Figure 5 is a perspective schematic diagram of a child safety seat according to an embodiment of the present invention, wherein the seat plate is in a first position. In the embodiment shown in Figure 4A, the seat plate 100 is provided with at least one first connecting portion 101. Specifically, in this embodiment, four first connecting portions 101 are provided. Optionally, more or fewer than four first connecting portions may be provided, such as three, six, etc. The number of first connecting portions can be reasonably selected according to actual needs, and the present invention does not limit this. Specifically, the first connecting portion 101 is a connecting post fixedly provided on the side of the seat plate 100 facing the base 110. In the embodiment shown in Figure 5, the base 110 is provided with at least one second connecting portion 111 that cooperates with the first connecting portion 101, and the seat plate 100 is slidably connected to the base 110 through the cooperation of the first connecting portion 101 and the second connecting portion 111. Specifically, in this embodiment, four second connecting portions 111 are provided. Optionally, more or fewer than four second connecting parts may be provided, such as three or six, with the number of second connecting parts matching the number of first connecting parts. Specifically, the second connecting part 111 is a first connecting groove provided on the side of the base 110 facing the seat plate 100. This first connecting groove extends in the front-rear direction of the seat. The connecting post inserted into the first connecting groove serves as a guide, allowing the seat plate 100 to slide back and forth along the length of the first connecting groove, while preventing the seat plate 100 from shifting laterally.

[0021] Referring again to Figures 4A and 5, in the embodiment shown in Figure 4A, the seat plate 100 is provided with at least one first adjustment part 102. Specifically, in this embodiment, two first adjustment parts 102 are provided. Optionally, more or fewer than two first adjustment parts may be provided, such as one, four, etc. The number of first adjustment parts can be reasonably selected according to actual needs, and the present invention does not limit this. Specifically, the first adjustment part 102 is an adjustment post fixedly provided on the side of the seat plate 100 facing the base 110. In the embodiment shown in Figure 5, the base 110 is provided with a second adjustment part 112 and a third adjustment part 113 that cooperate with the first adjustment part 102. Specifically, two second adjustment parts 112 and two third adjustment parts 113 are provided. Optionally, more or fewer second and third adjustment parts may be provided, and the number of second and third adjustment parts respectively matches the number of first connecting parts. Specifically, the second adjustment part 112 is a first adjustment hole provided on the side of the base 110 facing the seat plate 100, and the third adjustment part 113 is a second adjustment hole provided on the side of the base 110 facing the seat plate 100. The first adjustment hole is positioned such that when the seat plate 100 slides to the first position, the adjustment pin can be inserted into the first adjustment hole, thus fixing the seat plate 100 in the first position. To release the seat plate 100 from the first position, simply lift the seat plate 100 upwards, causing the adjustment pin to disengage from the first adjustment hole, thereby releasing the fixation of the seat plate. The second adjustment hole is positioned such that when the seat plate 100 slides to the second position, the adjustment pin can be inserted into the second adjustment hole, thus fixing the seat plate 100 in the second position. Similarly, to release the seat plate 100 from the second position, simply lift the seat plate 100 upwards, causing the adjustment pin to disengage from the second adjustment hole, thereby releasing the fixation of the seat plate. Those skilled in the art will understand that the provision of the first and second adjustment holes is merely exemplary. Additional adjustment holes, such as a third or fourth adjustment hole, can be provided according to usage requirements to allow the seat plate 100 to be fixed in more positions, such as a third or fourth position. This invention does not impose specific limitations in this regard. In the embodiments shown in Figures 4A and 5, the seat plate 100 can be released from its first or second position simply by lifting it, allowing the seat plate 100 to slide and change the seat length. This operation is convenient and easy to use. The length of the first adjustment part 102 is shorter than the length of the first connecting part 101. Lifting the seat plate 100 upwards until the first stop 1011 abuts against the lower surface of the upper plate of the base 110 completely disengages the first adjustment part 102 from the second adjustment part 112 or the third adjustment part 113. This allows the first connecting part 101 and the second connecting part 111 to move relative to each other in the vertical direction without disengaging, thus disengaging the first adjustment part 102 from the second adjustment part 112 or the third adjustment part 113.In some embodiments, the first adjustment part 102 may also be one or more sets of anti-slip ribs extending laterally, and the second adjustment part 112 may be an anti-slip groove that matches the shape of the anti-slip rib. The anti-slip groove is distributed along the front-rear direction on the upper surface of the base 110, and its number is greater than that of the anti-slip rib. The anti-slip rib and the anti-slip groove cooperate to prevent the seat 100 from moving relative to the base 110 in the front-rear direction. When the anti-slip rib cooperates with a portion of the anti-slip groove near the rear, the seat 100 is in a first position, at which time the child safety seat 1 is suitable for smaller children; when the anti-slip rib cooperates with a portion of the anti-slip groove near the front, the seat 100 is in a second position, at which time the child safety seat 1 is suitable for larger children.

[0022] Referring to Figures 7 and 8, the upper surface of the base 110 has a slope whose height gradually decreases from the front end of the base 110 toward the back. For example, the average slope of this slope relative to the horizontal plane is approximately 10 degrees. When the seat plate 100 is against the upper surface of the base 110, the front edge of the seat plate 100 is raised to facilitate the user lifting the seat plate 100 from the front edge. On the other hand, the slope of this upper surface is higher on the side closer to the front end of the base 110 and lower on the side closer to the front end of the base 110; in other words, the upper surface of the base 110 is slightly concave in the front-back direction. The second adjustment portion 112 is closer to the back in the front-back direction than the third adjustment portion 113. The second adjustment portion 112 and the third adjustment portion 113 extend vertically, thereby forming an angle of 5 to 15 degrees with the upper surface of the base 110. Correspondingly, the first connecting portion 101 and the first adjusting portion 102 also extend vertically and form a certain angle with the base plate 100. In some other embodiments, the second adjusting portion 112 and the third adjusting portion 113 form different angles with the upper surface of the base 110. For example, the second adjusting portion 112 forms an 85-degree angle with the upper surface of the base 110, and the third adjusting portion 113 forms an 80-degree angle with the upper surface of the base 110. Thus, when the first adjusting portion 102 located at the front edge of the base plate 100 is engaged with the third adjusting portion 113 (in the second position), the pressure exerted on the contact surface with the base 110 by the rear edge of the base plate 100 is greater, thereby preventing the rear edge of the base plate 100 from warping. The second adjustment part 112 and the third adjustment part 113 have different heights. Specifically, the bottom of the second adjustment part 112 is lower in the vertical direction than the third adjustment part 113, or the upper edge of the second adjustment part 112 is lower in the vertical direction than the third adjustment part 113. When the first adjustment part 102 of the seat plate 100 is inserted into the second adjustment part 112 (i.e., when the seat plate 100 is in the first position), the vertical height of the seat plate 100 is lower than the height of the seat plate 100 when the first adjustment part 102 is inserted into the third adjustment part 113 (i.e., when the seat plate 100 is in the second position). The first adjustment part 102 is located on the front side (e.g., at the front edge) of the seat plate 100 in the front-rear direction. The front and rear sides of the seat plate 100 are respectively provided with a first connecting part 101. For example, two first connecting parts 101 are located at the front edge of the seat plate 100 in the front-rear direction, and two first connecting parts 101 are located at the rear edge of the seat plate 100 in the front-rear direction, wherein the length of the first connecting part 101 located at the front edge is greater than the length of the first connecting part 101 located at the rear edge.For example, the first connecting portion 101 at the front edge can move both vertically and forward / backward relative to the second connecting portion 111; the first connecting portion 101 at the rear edge cannot move vertically relative to the second connecting portion 111, but can only move forward / backward. The seat plate 100 is made of elastic materials such as rubber or TPR (Thermoplastic Rubber). When the user lifts the seat plate 100 using the third recess 104 at the front edge of the seat plate 100, the seat plate 100 will deform. Specifically, referring to Figures 10 and 11, based on the child safety seat 1 shown in Figure 10, when the user lifts the seat 100 using the third recess 104 on the front edge of the seat 100, the front edge of the seat 100 disengages vertically from the base 110, causing the first adjustment part 102 to disengage from the third adjustment part 113; while the flat portion of the rear edge of the seat 100 remains attached to the base 110 under the fixing action of the first connecting part 101 located at the rear, thus causing the middle part of the seat 100 to undergo concave deformation towards the base 110. Therefore, the user can push the seat 100 to slide back and forth on the base 110 without lifting the entire seat 100 away from the base 110, ensuring the stability of the sliding motion. The user pushes the seat plate 100 along direction D2, causing it to slide against the base 110 in a back-facing direction. When the seat plate 100 slides to the position shown in Figure 11, the user stops applying force along D2 and the upward vertical force. At this point, the seat plate 100 returns to its state before deformation under the action of elastic potential energy. The first adjustment part 102 is vertically inserted into the second adjustment part 112, locking the base 110 in the first position. In some embodiments, the seat plate 100 can be made of a rigid material such as polyphenylene sulfide (PPS), and the length of the first connecting part 101 near the front end of the seat plate 100 is greater than the length of the first connecting part 101 near the rear end of the seat plate 100. When the user lifts the seat plate 100 using the third recess 104 on the front edge of the seat plate 100, the front edge of the seat plate 100 disengages from the base 110 in the vertical direction. Under the connection of multiple first connecting parts 101 of different lengths, the rear edge of the seat plate 100 pivots relative to the base 110.

[0023] Referring again to Figures 4A and 5, in this embodiment, the seat plate 100 further includes a first through hole 103 for threading the seat belt 500 (crotch strap), and the base 110 further includes a second through hole 114 for threading the crotch strap. The length of the first through hole 103 in the sliding direction is greater than the length of the second through hole 114 in the sliding direction, and during the sliding stroke of the seat plate 100 from the first position to the second position, the projection of the second through hole 114 in the vertical direction is always located within the projection of the first through hole 103 in the vertical direction (refer to Figure 6). Thus, during the sliding process of the seat plate 100 between the first position and the second position, the first through hole 103 and the second through hole 114 always have a partially overlapping area in the vertical direction, preventing the crotch strap from bending when passing through the first through hole 103 and the second through hole 114, thereby affecting the length of the crotch strap.

[0024] In other embodiments, referring to FIG4B, in the embodiment shown in FIG4B, the extension of the first through hole 103' in the front-rear direction is less than or equal to the extension of the first through hole 103 in the front-rear direction shown in FIG4A. When the seat plate 100 is in the first position, the projection of the second through hole 114 in the vertical direction does not coincide with the projection of the first through hole 103' in the vertical direction; when the seat plate 100 is in the second position, at least a portion of the projection of the second through hole 114 in the vertical direction coincides with the projection of the first through hole 103' in the vertical direction. A second receiving space (not shown) suitable for accommodating a seat belt is formed between the seat plate 100 and the base 110. Therefore, when the seat plate 100 is in the first position, the seat belt passing through the first through hole 103' and the second through hole 114 will fold, and a portion of the seat belt will be in the second receiving space, so the length of the seat belt passing through the first through hole 103' is less than the length of the seat belt passing through the first through hole 103. When the seat 100 is in the second position, the first through hole 103' and the second through hole 114 are aligned vertically, and the seat belt passing through the first through hole 103' and the second through hole 114 does not fold. Therefore, the length of the seat belt extending from the first through hole 103' in the second position is greater than the length of the seat belt extending from the first through hole 103 in the first position. When the seat 100 is in the first position, the seat length is shorter, suitable for smaller children, and the seat belt length is also shorter for smaller children. When the seat 100 is in the second position, the seat length is longer, suitable for larger children, and the seat belt length is also longer for larger children. Furthermore, when the seat 100 slides from the first position to the second position, the position of the first through hole 103' also moves forward, causing the seat belt to move forward, thereby providing more front-to-back legroom for larger children. Therefore, the first through-hole 103' shown in Figure 4B can reduce the workload of adjusting the seat belt and increase the ease of use of the child safety seat. This will be further explained later.

[0025] Referring to Figures 5 and 6, in one embodiment of the invention, the base 110 is further provided with a fourth recess 117. This fourth recess 117 is adapted to allow the seatbelt adjustment strap to pass through. A locking member 118 is also provided within this fourth recess 117. The locking member 118 is configured to allow only unidirectional sliding of the seatbelt adjustment strap. Specifically, the child safety seat's seatbelt (e.g., shoulder strap, crotch strap, or lap belt) includes a working portion and a free portion. The working portion is exposed outside the child safety seat, for example, outside the backrest 20 or seat plate 100. A buckle (e.g., a five-point buckle) is slidably disposed on the working portion. The child is secured to the child safety seat by the working portion of the seatbelt and the buckle. The free portion is disposed inside the child safety seat, for example, inside the backrest 20 or between the seat plate 100 and the base 110. The free portion of the seatbelt is connected to the seatbelt adjustment strap. By pulling the seatbelt adjustment strap, the user can reduce the length of the working portion of the seatbelt so that the seatbelt can fit children of different sizes. The locking element 118 can switch between a locked state and an unlocked state. The locking element 118 includes a reset element that constantly tends to return the locking element 118 to the locked state and keeps the locking element 118 in the locked state. In the locked state, the locking element 118 only allows the seat belt adjustment strap to slide in a direction that reduces the length of the usable portion. In the unlocked state, the locking element 118 does not restrict the sliding of the seat belt adjustment strap. The seat belt adjustment strap passes through the fourth recess 117, such that at least a portion of the seat belt adjustment strap extends from inside the child safety seat to the outside of the child safety seat interior. The user pulls the seat belt adjustment strap to reduce the length of the usable portion of the seat belt. In this embodiment, the seat belt adjustment strap is connected to the shoulder strap. Optionally, the seat belt adjustment strap can also be connected to other seat belts, such as a crotch strap, lap belt, etc. In one embodiment of the invention, the seat plate 100 is also provided with a fourth through hole 105. Optionally, during the sliding stroke of the seat plate 100 from the first position to the second position, the vertical projection of the fourth through hole 105 at least partially coincides with the vertical projection of the fourth recess 117. The seatbelt adjustment strap, after passing through the fourth recess 117, can continue through the fourth through hole 105 to be exposed outside the seat plate 100, facilitating user operation of the seatbelt adjustment strap. Optionally, the fourth through hole 105 allows the user to access and operate the locking member 118 to switch the locking member 118 from a locked state to an unlocked state.

[0026] Referring to Figures 6 to 8, Figure 6 is a top view of a child safety seat according to an embodiment of the present invention, wherein the seat plate 100 is in a second position; Figure 7 is a cross-sectional view along line BB in Figure 6; Figure 8 is a cross-sectional view along line AA in Figure 6. As shown in Figure 7, a first stop 1011 is provided at one end of the first connecting part 101, for example, a connecting post, away from the seat plate 100. The first stop 1011 is detachably fixed to the end of the connecting post away from the seat plate 100, and the size of the first stop 1011 is set so that it cannot pass through the first connecting groove. Specifically, in this embodiment, the first stop 1011 is a gasket, which is fixed to the end of the connecting post away from the seat plate 100 by screws 1013. The diameter of the gasket is larger than the horizontal width of the second connecting part 111, for example, the first connecting groove, therefore, the gasket cannot pass through the first connecting groove. When the seat plate 100 is lifted upwards, the seat plate will be restricted from further lifting when the shim abuts against the back of the side of the base 110 facing the seat plate 100. The shim allows the bottom surface of the seat plate to disengage from the top surface of the base while preventing the seat plate from completely detaching from the base during upward lifting. In this embodiment, the length of the connecting post extending out of the first connecting groove is greater than the depth of the adjusting post inserted into the first or second adjusting hole (refer to Figure 8). Thus, while preventing the seat plate from detaching from the base during upward lifting, the adjusting post is allowed to disengage from the first or second adjusting hole. Those skilled in the art should understand that the shim is merely exemplary, and the first stop 1011 can also be other suitable mechanisms, such as a large-head screw, etc., which are not limited by this invention.

[0027] Referring again to FIG. 7, in the embodiment shown in FIG. 7, a first elastic member 1012 is arranged around the connecting post. One end of the first elastic member 1012 abuts against the back side of the base 110 facing the seat plate 100, and the other end of the first elastic member 1012 abuts against the first stop member 1011. The first elastic member 1012 biases the connecting post away from the seat plate 100 through the first stop member 1011, that is, biases it towards engaging with the first adjustment hole and the second adjustment hole. Specifically, in this embodiment, the first elastic member 1012 is a helical spring. The helical spring is wrapped around the connecting post and abuts against both the back side of the base 110 facing the seat plate 100 and the first stop member 1011. The helical spring biases the connecting post away from the seat plate 100 through the first stop member 1011, thereby biasing the seat plate 100 towards the base 110. When raising the seat 100, the bias provided by the coil spring needs to be overcome to lift the seat 100. After the external force used to raise the seat 100 is removed, the seat 100 falls back towards the base 110 under the action of the coil spring. If the seat 100 is in the first or second position at this time, the adjusting post will insert into the first or second adjusting hole. The biasing of the seat 100 towards the base 110 by the first elastic element 1012 is very advantageous in the actual use of child safety seats. Users do not need to press the seat 100 against the base 110 while sliding the seat 100; instead, they only need to slide the seat 100. When the seat 100 reaches the first or second position, the adjusting post will automatically insert into the first or second adjusting hole under the action of the first elastic element 1012, and the seat 100 will automatically fall back to its initial height. The first elastic element 1012 simplifies the sliding and adjustment of the seat 100 in at least two ways:

[0028] a) Facilitates adjustment of the seat position. When the user slides the seat 100, the first adjustment part 102, the second adjustment part 112, and the third adjustment part 113 cannot be observed, and therefore it is impossible to visually determine whether the seat 100 has reached the first or second position. A first elastic element 1012 is provided so that when the seat 100 reaches the first or second position, the adjustment column automatically enters the first or second adjustment hole under the elastic force of the first elastic element 1012, thereby avoiding the user's workload in searching for the first or second position.

[0029] b) Automatic seat plate reset. A first elastic element 1012 is provided. When the seat plate 100 reaches the first position or the second position, the adjusting column will automatically insert into the first adjusting hole or the second adjusting hole, and the seat plate 100 will automatically fall back to the initial height, thereby saving the user the effort of pressing down the seat plate 100 to make the seat plate fall back to the initial height.

[0030] Optionally, a first elastic element 1012 is provided on each connecting post.

[0031] Referring again to FIG. 5, in the embodiment shown in FIG. 5, a storage groove 115 is provided on the side of the base 110 facing the seat plate 100. Compared with the second through hole 114, the storage groove 115 is located closer to the front end of the base 110. The storage groove 115 and the area of ​​the seat plate 100 corresponding to the storage groove 115 form a storage space for storing the crotch strap and crotch strap buckle. Those skilled in the art should understand that the size and position of the storage groove 115 can be reasonably selected according to actual needs, and the present invention does not limit this. Further, in the embodiment shown in FIG. 5, a first recess 116 is formed on the front end of the base 110 facing the seat plate 100. The first recess 116 is formed by the base 110 being recessed from the side facing the seat plate 100 in a direction away from the seat plate 100. The first recess 116 forms an operating space between the front end of the seat plate 100 and the front end of the base 110. In actual operation, after the user places their hand into the operating space, they push against the front end of the seat plate 100 facing the operating space to lift the seat plate 100. Further, referring to Figures 4A and 4B, a third recess 104 is provided on the front end of the seat plate 100 facing the operating space. The user places their hand into the operating space and then grasps the front edge of the third recess 104 to facilitate lifting and sliding the seat plate 100. Referring again to Figure 7, in the embodiment shown in Figure 7, a gap 120 is formed between the front end of the base 110 facing the seat plate 100 and the front end of the seat plate 100 facing the base 110, through which an adjustment strap for adjusting the length of the seat belt (shoulder strap) passes.

[0032] Referring to Figures 9 to 11, Figure 9 is a perspective view of a child safety seat 1 according to an embodiment of the present invention, wherein the seat 200 is in a second position; Figure 10 is a side view of a child safety seat 1 according to an embodiment of the present invention, wherein the seat 200 is in the second position, at which time the child safety seat 1 provides a longer seating length in the fore-and-aft direction, suitable for larger children; Figure 11 is a side view of a child safety seat 1 according to an embodiment of the present invention, wherein the seat 200 is in a first position, at which time the child safety seat 1 provides a shorter seating length in the fore-and-aft direction than when the seat 200 is in the second position, suitable for smaller children. In an embodiment of the present invention, the child safety seat 1 includes a seat adjustment system 10, the seat adjustment system 10 includes a seat 200 and a base 210, the seat 200 is slidably connected to the base 210, and the seat 200 can slide relative to the base between a first position and a second position. Referring also to Figures 10 and 11, in the child safety seat 1 shown in Figure 10, the seat 200 is in the second position. The seat plate 200 shown in Figure 10 slides along the D2 direction to enter a first position (as shown in Figure 11). Similarly, the seat plate 200 shown in Figure 11 slides along the D1 direction, which is opposite to the D2 direction, to enter a second position (as shown in Figure 10). The seat plate 200 has a first through hole 2001 for passing a crotch strap and a first recess 2102 for operating the seat plate 200. In this embodiment, the first through hole 2001 and the first recess 2102 are structurally and functionally similar to the first through hole 103' and the first recess 116 in the embodiments shown in Figures 4B and 5, and will not be described again here.

[0033] Referring to Figures 12 to 14, Figure 12 is a structural schematic diagram of a seat plate according to an embodiment of the present invention; Figure 13 is a perspective schematic diagram of a child safety seat according to an embodiment of the present invention, wherein the seat plate is in a concealed state; Figure 14 is a structural schematic diagram of a seat plate 200 according to an embodiment of the present invention, wherein the upper plate 250 on the side of the seat plate away from the base is removed. In the embodiments shown in Figures 12 to 14, the seat plate 200 includes an upper plate 250 and a lower plate 220, the upper plate 250 being connected to the lower plate 220, and a first receiving space 230 being formed between the upper plate 250 and the lower plate 220. The upper plate 250 and the lower plate 220 are fastened together to form a stepped structure. For example, the upper plate 250 is longer than the lower plate 220 in the front-to-back direction, so that when the upper plate 250 and the lower plate 220 are fastened together, the upper plate 250 has a flat section near the back that does not overlap with the lower plate 220, and the thickness of this flat section in the vertical direction is less than the thickness of the fastening portion of the upper plate 250 and the lower plate 220. The base 210 is formed with a stepped structure. When the seat plate 200 is in the first position, the flat section of the seat plate 200 overlaps with the upper part of the stepped structure of the base 210. When the seat plate 200 slides from the first position to the second position, the flat section of the upper plate 250 vertically blocks the cavity formed between the lower plate 220 and the lower part of the stepped structure of the base 210 to prevent the child's buttocks from being pinched, thus improving the riding experience. The first connecting part 201 is provided on the side of the lower plate 220 facing the base 210, the first adjusting part 202 is provided on the side of the lower plate 220 away from the base 210, and a portion of the first adjusting part 202 is located in the first receiving space 230.

[0034] In this embodiment, the first connecting portion 201 is a protruding strip, which is fixedly disposed on the side of the seat plate 200 facing the base 210, and extends in the front-rear direction of the seat plate 200. Specifically, two protruding strips are provided. Optionally, more or fewer than two first connecting portions may be provided, such as one, four, etc. The number of first connecting portions can be reasonably selected according to actual needs, and the present invention does not limit this. Preferably, two protruding strips are provided. The two protruding strips are symmetrically arranged on the seat plate 200 about the vertical direction.

[0035] In this embodiment, the second connecting portion 211 is a second connecting groove. The second connecting groove is disposed on the side of the base 210 facing the seat plate 200, and the second connecting groove is recessed in a direction away from the seat plate 200. The second connecting groove extends in the front-rear direction of the base 210. Specifically, two second connecting grooves are provided, and the second connecting grooves are symmetrically arranged on the base 210 about the vertical direction. The position of the second connecting groove is set such that two protrusions can be respectively embedded in the two second connecting grooves. The length of the second connecting groove in the front-rear direction is greater than the length of the protrusions. Therefore, the protrusions are slidable along the second connecting grooves. By sliding the protrusions in the second connecting grooves, the seat plate 200 slides in the front-rear direction of the base 210, while restricting the left-right sliding of the seat plate 200 in the lateral direction of the base 210.

[0036] In this embodiment, referring to FIG12, a second stop 2011 is provided on the side of the protrusion away from the seat plate 200, and the second stop 2011 is connected to the side of the protrusion away from the seat plate 200. Specifically, two second stop 2011s are provided on each protrusion, and the two second stop 2011s are respectively located at both ends of the protrusion. Optionally, other numbers of second stop 2011s may also be provided on each protrusion, such as 1, 4, etc. Optionally, the second stop 2011s can be set at any position on the protrusion. Those skilled in the art should understand that the number and position of the second stop 2011s can be selected according to actual needs, and the present invention does not limit this. A through groove 2111 is provided at the bottom of the second connecting groove, the through groove 2111 extends through the bottom of the second connecting groove, and the through groove 2111 extends in the front-rear direction of the base 210. The position and number of through grooves 2111 correspond to the number and position of the second stop 2011s. The second stop 2011 passes through the through groove 2111 from the back side of the second connecting groove and is detachably fixed to the side of the protrusion away from the seat plate 200. Optionally, a portion of the second stop 2011 is sized to prevent it from passing through the through groove 2111. The second stop 2011 can slide in the through groove 2111, thereby limiting the sliding stroke of the second stop 2011 in the through groove 2111, which in turn limits the sliding stroke of the protrusion in the second connecting groove, and also limits the sliding stroke of the seat plate 200 in the front-rear direction of the base 210.

[0037] Specifically, referring to FIG15, FIG15 is a cross-sectional schematic diagram along line CC in FIG13, in which the backing structure is partially omitted. In this embodiment, the second stop 2011 includes a second screw 20111 and a second washer 20112. The second screw 20111 passes through the through groove 2111 to fix the second washer 20112 to the side of the protrusion away from the seat plate 200, and presses the second washer 20112 against the back side of the bottom of the second connecting groove. The second washer 20112 is sized to not pass through the through groove 2111. By setting the second stop 2011, the degree of freedom of the seat plate 200 in the vertical direction is restricted. Therefore, the seat plate 200 cannot be raised or lowered in the vertical direction relative to the base 210. Those skilled in the art should understand that the washer is only exemplary, and the second stop 2011 can also be other suitable mechanisms, such as a thumb screw, etc. The present invention does not limit this. Similar to the embodiment shown in FIG7, in the embodiment shown in FIG15, a gap is formed between the front end of the base 210 facing the seat plate 200 and the front end of the seat plate 200 facing the base 210, through which a seat belt (e.g., a crotch strap) passes.

[0038] In one embodiment, a second elastic element (not shown) may be provided around the second screw 20111. One end of the second elastic element abuts against the back side of the bottom of the second connecting groove, and the other end of the second elastic element abuts against the second washer 20112. The second elastic element biases the second screw 20111 away from the seat plate 200 through the second washer 20112. Specifically, the second elastic element may be a coil spring. Providing the second elastic element can at least prevent the second screw 20111 from gradually loosening during use, thereby improving the service life of the seat plate adjustment system.

[0039] Referring to FIG14, the upper plate 250 and the lower plate 220 define a first receiving space 230 inside the seat plate 200. The first adjustment part 202 is at least partially disposed in the first receiving space 230. The first adjustment part 202 includes: an operating member 2021, which is fitted in a first groove of the lower plate 220 and is slidable between a locked position and an adjusted position; and a first engaging member 2023, which is operably connected to the operating member 2021 and is slidable between an extended position and a retracted position. The first engaging member 2023 is adapted to engage with the second adjustment part 212 and the third adjustment part 213. When the operating member 2021 moves to the locked position, the first engaging member 2023 moves to the extended position under the influence of the operating member 2021. At this time, the first engaging member engages with the second adjusting part 212 and the third adjusting part 213 to restrict the sliding of the seat plate 200 in the front-back direction, thereby locking the seat plate 200 in the first or second position. When the operating member 2021 moves to the adjusted position, the first engaging member 2023 moves to the retracted position under the influence of the operating member 2021. At this time, the first engaging member 2023 no longer engages with the second adjusting part 212 and the third adjusting part 213, and the seat plate 200 can slide freely in the front-back direction of the base 210 to adjust the position of the seat plate 200. In addition, the operating member 2021 slides in the front-back direction, and the first engaging member 2023 slides in the lateral direction, with the sliding directions of the two perpendicular to each other. Specifically, the first engaging member 2023 is a cylindrical pin, and the second adjusting part 212 and the third adjusting part 213 are insertion holes. Alternatively, the first snap-fit ​​component can also be configured as an element of other shapes, as long as it can meet the snap-fit ​​requirements with the second adjustment part 212 and the third adjustment part 213.

[0040] In this embodiment, since the first locking member 2023 is operably connected to the operating member 2021, the sliding of the operating member 2021 can change the position of the first locking member 2023. Specifically, when the seat plate 200 is in the first position, the operating member 2021 is slid to the locking position, causing the first engaging member 2023 to slide to the extended position, whereby the first engaging member 2023 engages with the second adjusting part 212, and the seat plate 200 is fixed to the first position; when the operating member 2021 is slid to the adjusting position, the first engaging member 2023 slides to the retracted position, whereby the first engaging member 2023 disengages from the second adjusting part 212, and the seat plate 200 is released from the first position; when the seat plate 200 is in the second position, the operating member 2021 is slid to the locking position, causing the first engaging member 2023 to slide to the extended position, whereby the first engaging member 2023 engages with the third adjusting part 213, and the seat plate 200 is fixed to the second position; when the operating member 2021 is slid to the adjusting position, the first engaging member 2023 slides to the retracted position, whereby the first engaging member 2023 disengages from the third adjusting part 213, and the seat plate 200 is released from the second position.

[0041] Referring again to FIG. 14, optionally, the first adjustment part 202 further includes a first connector 2022, one end of which is fixedly connected to the operating member 2021, and the other end of which is fixedly connected to the first engaging member 2023. Preferably, the first connector 2022 is a flexible connecting strip, disposed within the arc-shaped first groove of the lower plate 220. When the first connector 2022 slides within the first groove, it can adapt to the shape of the first groove and undergo corresponding deformation, converting the forward and backward movement of the operating member 2021 into the lateral movement of the first engaging member 2023. Optionally, the first connector 2022 and the operating member 2021 are integrated.

[0042] Referring to Figures 13 and 14, the second adjustment part 212 is the third adjustment hole, and the third adjustment part 213 is the fourth adjustment hole. The third and fourth adjustment holes are provided on the side of the base 210 facing the seat plate 200, and the third and fourth adjustment holes extend in the horizontal direction of the base 210. When the seat plate 200 slides to the first position, the operating member 2021 is slid to the locking position, causing the first engaging member 2023 to slide to the extended position. At this time, a portion of the first engaging member 2023 is inserted into and fixed in the third adjustment hole, thereby restricting the sliding of the seat plate 200 in the front-back direction, and the seat plate 200 is fixed in the first position; when the operating member 2021 is slid to the adjustment position, the first engaging member 2023 slides to the retracted position. At this time, the first engaging member 2023 disengages from the third adjustment hole, thereby releasing the restriction on the sliding of the seat plate 200 in the front-back direction, and the seat plate 200 is released from the first position. When the seat plate 200 slides to the second position, the operating member 2021 is slid to the locking position, causing the first engaging member 2023 to slide to the extended position. At this time, a portion of the first engaging member 2023 is inserted into and fixed in the fourth adjustment hole, thereby restricting the sliding of the seat plate 200 in the front-back direction, and the seat plate 200 is fixed in the second position. Sliding the operating member 2021 to the adjustment position causes the first engaging member 2023 to slide to the retracted position. At this time, the first engaging member disengages from the fourth adjustment hole, thereby releasing the restriction on the sliding of the seat plate 200 in the front-back direction, and the seat plate 200 is released from the second position.

[0043] Referring again to FIG14, in one embodiment, the first receiving space 230 is further provided with a first receiving groove 2204 and a second receiving groove 2205 that are interconnected. The first receiving groove 2204 is adapted to receive the first connector 2022, and the second receiving groove 2205 is adapted to receive the first engaging member 2023. The first receiving space 230 is also provided with a third through hole 2206 that communicates with the second receiving groove 2205, and the first engaging member 2023 can partially pass through the third through hole 2206. When the first engaging member 2023 slides to the extended position, a part of the first engaging member 2023 passes through the third through hole 2206 and enters the third adjustment hole or the fourth adjustment hole, while the other part of the first engaging member 2023 is located in the third through hole 2206.

[0044] In one embodiment, the seat plate 200 further includes a second recess 2201, which is formed by at least a portion of the front end of the seat plate 200 facing the base 210 being recessed in a direction away from the base 210. An opening 2202 is provided on the inner wall of the second recess 2201 away from the front end of the seat plate 200. The opening 2202 communicates with the first receiving space 230. The operating member 2021 is slidably disposed in the second recess 2201 and can at least partially pass through the opening 2202.

[0045] In one embodiment, the first adjustment part 202 further includes a third elastic element 2024. One end of the third elastic element 2024 is fixedly connected to the operating member 2021, and the other end of the third elastic element 2024 is fixedly connected to the seat plate 200. The third elastic element 2024 causes the operating member 2021 to have a tendency to slide toward the locked position. Preferably, the third elastic element 2024 is a tension spring. Those skilled in the art should understand that the tension spring in this embodiment is only exemplary, and the third elastic element 2024 can also be a torsion spring or other suitable element. The present invention does not limit this.

[0046] In one embodiment, the operating member 2021 is provided with a limiting groove 20211, and a limiting protrusion 2203 that cooperates with the limiting groove 20211 is provided in the first receiving space 230. The limiting protrusion 2203 is located on the side of the lower plate 220 away from the base 210. The limiting groove 20211 extends in the front-rear direction of the base 210. When the front end of the limiting groove 20211 abuts against the limiting protrusion 2203, the operating member 2021 reaches a first limit position. Optionally, the first limit position corresponds to the locking position of the operating member 2021. When the rear end of the limiting groove 20211 abuts against the limiting protrusion 2203, the operating member 2021 reaches a second limit position. Optionally, the second limit position corresponds to the adjustment position of the operating member 2021.

[0047] The effect of the sliding of the seat plate 100 between the first and second positions on the seat belt 500 (e.g., a crotch strap) will be further explained below with reference to Figures 16A, 16B, 17A, and 17B. In this embodiment, when the seat plate 100 is in the first position, the projection of the second through hole 2101 in the vertical direction does not coincide with the projection of the first through hole 2001 in the vertical direction (refer to Figure 16A); when the seat plate 100 is in the second position, at least a portion of the projection of the second through hole 2101 in the vertical direction coincides with the projection of the first through hole 2001 in the vertical direction (Figure 17A). A second receiving space 240 suitable for accommodating the seat belt 500 is formed between the seat plate 200 and the base 210. Therefore, when the seat plate 200 is in the first position, the seat belt 500 passing through the first through hole 2001 and the second through hole 2101 will fold, and the folded portion of the seat belt will be located in the second receiving space 240. Referring to Figures 16B and 17B, where L1 represents the height of the upper vertical edge of the second through hole 2101, L2 represents the height of the upper vertical edge of the first through hole 2001, and the dashed line represents the seat belt, the dashed portion above L2 indicates the length of the seat belt extending through the first through hole 2001. In Figure 16B, the seat plate 200 is in the first position, the seat belt is folded in the front-back direction, and the length of the folded portion of the seat belt is d2, while the length of the seat belt extending through the first through hole 2001 is d3. In Figure 17B, the seat plate 200 is in the second position, the seat belt is not folded, and the length of the seat belt extending through the first through hole 2001 is d1. Therefore, d1 = d2 + d3. That is, when the seat plate 200 is in the first position, the length of the seat belt entering and passing through the first through hole 2001 is less than the length of the seat belt entering and passing through the first through hole 2001 when the seat plate 200 is in the second position. When the seat 200 is in the first position, the seat length is shorter, making it suitable for smaller children. Furthermore, the seat belt length is also shorter for smaller children. Additionally, when the seat 200 slides from the first position to the second position, the position of the first through hole 2001 also moves forward by a distance d2, causing the crotch strap to move forward as well. That is, when the seat 200 slides from the first position to the second position, the distance between the crotch strap and the backrest increases by d2 compared to when the seat 200 is in the first position, thus providing more forward and backward legroom for larger children. Therefore, the seat adjustment system 10 according to an embodiment of the present invention can reduce the workload of shortening the seat belt when the seat 200 is in the first position, increasing the ease of use of the child safety seat.

[0048] Referring to Figures 18 to 20, an embodiment of the present invention also provides a child safety seat 1, including the seat adjustment system 10 in the foregoing embodiments; and a backrest 20, the backrest 20 being detachably connected to the base 110, 210.

[0049] Referring to FIG19, in one embodiment, the bases 110 and 210 include an engagement groove 300, and the backrest 20 includes an engagement portion 400, which engages in the engagement groove 300. Specifically, the engagement portion 400 includes a latch 401, which is slidable in a front-rear direction to switch between a locked position and an unlocked position. In the locked position, the latch slides into the engagement groove 300 to engage in the engagement groove 300; in the unlocked position, the latch 401 slides away from the engagement groove 300 to disengage from the engagement groove 300 and unlock from the engagement groove 300. Optionally, the engagement portion 400 further includes a fourth elastic element 4024, which causes the latch 401 to have a tendency to slide toward the engagement groove 300. Preferably, the fourth elastic element 4024 is a coil spring. Those skilled in the art should understand that the coil spring is merely exemplary, and the fourth elastic element 4024 can be any other suitable elastic element.

[0050] Referring to Figure 19, in one embodiment, the front end of the latch 401 is provided with a curved surface 4011. When pressure is applied to the curved surface 4011, the latch 401 slides toward the unlocking position. During installation, the curved surface 4011 is pressed against the edge of the engagement groove 300, and the latch 401 slides toward the unlocking position. When the latch 401 is fully engaged in the engagement groove 300, under the action of the fourth elastic member 4024, the latch 401 slides toward the engagement groove 300 to the locking position.

[0051] Referring to Figures 19 and 20, in one embodiment, the bases 110 and 210 include a connecting rod 310 disposed at the rear end of the bases 110 and 210. The backrest 20 includes a hook 410 that hooks onto the connecting rod 310 for engagement. The bases 110 and 210 also include a reinforcing tube 320 disposed within the connecting rod 310 to improve the structural strength of the connecting rod. Furthermore, the connection strength of the backrest 20 is improved because the reinforcing tube 320 is connected to the base support. In some embodiments, the reinforcing tube and the base support are made of steel and are welded or tightly fitted together.

[0052] The installation and disassembly process of the backrest 20 will be described below with reference to Figures 18 and 19.

[0053] Referring to Figure 18, the backrest 20 and the bases 110 and 210 are in a disassembled state. First, hook the hook 410 onto the connecting rod 310; then, rotate the backrest 20 around the connecting rod 310 as a pivot until the curved surface 4011 of the latch 401 contacts the edge of the engagement groove 300; press the latch 401 towards the engagement groove, causing the latch 401 to retract towards the unlocking position until the latch 401 enters the engagement groove 300; under the action of the fourth elastic element 4024, the latch 401 slides towards the engagement groove 300 to the locking position. At this point, the backrest 20 is installed.

[0054] Referring to Figure 19, the backrest 20 and the bases 110 and 210 are in the installed state. First, push the latch 401 to the unlock position; while keeping the latch 401 in the unlock position, rotate the backrest around the connecting rod 310 as a pivot; after the latch 401 leaves the engagement groove 300, release the latch 401; move the backrest in the opposite direction to the opening of the hook 410 to release the hook 410 from the connecting rod 310. At this point, the backrest 20 is completely disassembled.

[0055] In the child safety seat provided in the embodiment of the present invention, the backrest can be easily and quickly installed and disassembled by means of the engagement groove 300 and engagement part 400, and the hook part 410 and connecting rod 310 hooking and cooperating, and is highly easy to use.

[0056] Referring to Figures 9 to 17, the present invention also provides a seat adjustment system for a child safety seat 1, characterized in that it includes a seat 200 and a base 210, the seat 200 being movable relative to the base 210 along a first direction between a first position and a second position. The seat 200 further includes an adjustment part 202, a connecting part 201, and a first through hole 2001 for a crotch strap. The base 210 includes a second through hole 2101 for a crotch strap. The adjustment part 202 operably restricts the movement of the seat 200 relative to the base 210 along the first direction, i.e., the user can restrict and release the movement of the seat 200 in the front-rear direction by switching the operating member 2021 between a locked position and an adjustment position. The connecting part 201 restricts the movement of the seat 200 relative to the base 210 along a second direction. The first direction is the front-rear direction, the second direction is the lateral direction, and the second direction is perpendicular to the first direction. In the first position, the projection of the second through hole 2101 in the vertical direction does not coincide with the projection of the first through hole 2001 in the vertical direction. At this position, the exposed length of the crotch strap is shorter, and the exposed position is closer to the backrest, making it suitable for smaller children. In the second position, at least a portion of the projection of the second through hole 2101 in the vertical direction coincides with the projection of the first through hole 2001 in the vertical direction. At this position, the exposed length of the crotch strap is longer, and the exposed position is further away from the backrest, making it suitable for larger children. Therefore, the length and position of the crotch strap can be adjusted simultaneously with the length of the child safety seat 1.

[0057] Referring to Figures 21 and 22, embodiments of the present invention also provide a child safety seat 6, including: a base 61 and a backrest 62 connected to the base 61. An armrest 610 is provided on the base 61. Optionally, the base 61 and the armrest 610 are an integral piece. Wings 620 extending from the backrest 62 are respectively provided on both lateral sides of the backrest 62. In some embodiments, the backrest 62 is pivotally connected to the base 61 to adjust the angle of the backrest 62. When the backrest 62 pivots relative to the base 61, the distance between the armrest 610 and the wings 620 also changes accordingly. In still other embodiments, the backrest 62 is detachably connected to the base 61 by pivoting or inserting. The wings 620 and the armrest 610 are independent components, and a gap exists between the wings 620 and the armrest 610 in use. In the event of an emergency braking or a traffic accident such as a vehicle collision, the backrest 62, under the influence of inertia, pivots forward about the connection between the backrest 62 and the base 61 (i.e., in the D1 direction shown in Figures 2 and 11). The wings 620 press against the armrest 610, thereby supporting the backrest 62 and limiting its excessive forward pivoting. However, in actual use, if the user installs it improperly or the material of the backrest 62 is not sufficiently rigid, the wings 620 on both sides of the backrest 62 may deform under the combined effect of the inertia of the forward pivoting of the backrest 62 and the support provided by the armrest 610. Specifically, the wings 620 on both sides of the backrest 62 may deform outward in the lateral direction, for example, the wings 620 on both sides of the backrest 62 may open outward or misalign with the contact surface with the armrest 610 in the lateral direction. At this time, the backrest 62 will continue to pivot forward, causing the child sitting in the child safety seat 6 to excessively flex and extend their head and neck forward under the pressure of the backrest 62. In extreme conditions such as when the vehicle seat spacing is too narrow, a child's head may touch the back of the vehicle seat in front of them. The term "outward" in this invention refers to the direction away from the child safety seat 6 in the lateral direction.

[0058] Referring to Figures 22 and 23, in one embodiment of the present invention, a first surface 611 is provided on the side of the armrest 610 facing the wing 620, and a second surface 621 is provided on the edge of the wing 620 facing the armrest 610. The first surface 611 and the second surface 621 are disposed opposite to each other. That is, when the backrest 62 moves forward due to an accident (e.g., pivoting), the second surface 621 will press against the first surface 611 and come into contact with the first surface 611. A limiting mechanism 630 is provided on the first surface 611 and the second surface 621. The limiting mechanism 630 is configured to prevent the wing 620 from deforming in the lateral direction when the wing 620 presses against the armrest 610, thereby preventing the backrest 62 from moving forward continuously and ensuring the life safety of the child sitting in the child safety seat 6.

[0059] Referring to Figures 24 and 25, in one embodiment, the limiting mechanism 630 includes a positioning recess 631 disposed on a first surface 611 and a first positioning protrusion 632 disposed on a second surface 621. When the wing 620 presses against the armrest 610, the first positioning protrusion 632 can be inserted into the positioning recess 631 to limit the deformation of the wing 620 in the lateral direction, thereby preventing the backrest 62 from continuously moving forward and ensuring the life safety of the child sitting in the child safety seat 6. Optionally, in other embodiments, the positioning recess 631 and the first positioning protrusion 632 can also be disposed in opposite directions, that is, the positioning recess 631 is disposed on the second surface 621 and the first positioning protrusion 632 is disposed on the first surface 611. Optionally, the positioning recess 631 is configured as an elongated rectangular structure and is recessed away from the first surface 611 or the second surface 621 where the positioning recess 631 is located. Optionally, the first positioning protrusion 632 is configured as an elongated rectangular structure similar in shape to the positioning recess 631 but slightly smaller in size, and protrudes away from the second surface 621 or the first surface 611 where the positioning recess 631 is located. In such an embodiment, the first positioning protrusion 632 and the positioning recess 631 are in clearance fit. Optionally, the positioning recess 631 and the first positioning protrusion 632 can also be configured as other suitable shapes according to actual needs. For example, the positioning recess 631 can be a fan shape or an inverted trapezoid with its width gradually narrowing along the front-back direction. The present invention does not limit this.

[0060] Referring to Figures 26 and 27, in one embodiment, the limiting mechanism 630 includes a second positioning protrusion 633 disposed on the first surface 611 and a third positioning protrusion 634 disposed on the second surface 621. Specifically, the second positioning protrusion 633 is disposed on the outer side in the lateral direction relative to the third positioning protrusion 634. When the wing 620 presses against the armrest 610, the projections of the second positioning protrusion 633 and the third positioning protrusion 634 in the lateral direction at least partially overlap. Thus, the second positioning protrusion 633 can restrict the movement of the third positioning protrusion 634 outward in the lateral direction, thereby limiting the deformation of the wing 620 in the lateral direction to prevent the backrest 62 from continuously moving forward and ensuring the life safety of the child sitting in the child safety seat 6. Optionally, in other embodiments, two second positioning protrusions 633 may be provided on the first surface 611, and the third positioning protrusion 634 may be positioned such that when the wing 620 presses against the armrest 610, the third positioning protrusion 634 can enter the gap formed between the two second positioning protrusions 633, thereby limiting the deformation of the wing 620 in the lateral direction. Optionally, in other embodiments, two third positioning protrusions 634 may be provided on the second surface 621, and the second positioning protrusion 633 may be positioned such that when the wing 620 presses against the armrest 610, the second positioning protrusion 633 can enter the gap formed between the two third positioning protrusions 634, thereby limiting the deformation of the wing 620 in the lateral direction. Specifically, the second positioning protrusions 633 and the third positioning protrusions 634 are configured as elongated rectangular structures and protrude from the second surface 621 or the first surface 611 where the second positioning protrusions 633 and the third positioning protrusions 634 are located. Optionally, the second positioning protrusion 633 and the third positioning protrusion 634 can also be set to other suitable shapes according to actual needs, such as a fan shape or an inverted trapezoid with the width gradually narrowing along the front and rear directions. The present invention does not limit this.

[0061] Referring to Figures 28 and 29, in one embodiment, the limiting mechanism 630 includes a friction element 635. The friction element 635 is disposed on at least one of the first surface 611 and the second surface 621. When the wing 620 presses against the armrest 610, the friction element 635 provides a frictional force that restricts the lateral movement of the wing 620 relative to the armrest 610. This prevents the backrest 62 from continuously moving forward, ensuring the safety of the child seat 6. Optionally, the friction element 635 is a friction pad mounted on the first surface 611 and / or the second surface 621, or the friction element 635 may be a rough surface formed on the first surface 611 and / or the second surface 621. The friction element 635 can be implemented in a suitable manner according to actual needs, as long as it can provide a frictional force that restricts the lateral movement of the wing 620 relative to the armrest 610.

[0062] Referring to Figures 30 and 31, in one embodiment, the limiting mechanism 630 includes at least two limiting ribs 636. The at least two limiting ribs 636 are disposed on one of the first surface 611 and the second surface 621, and are located on either side of the lateral edge of the first surface 611 or the second surface 621, respectively. When the wing 620 presses against the armrest 610, causing the first surface 611 to contact the second surface 632, the at least two limiting ribs 636 clamp the other of the first surface 611 and the second surface 621 to limit the lateral movement of the wing 620 relative to the armrest 610. This prevents the backrest 62 from continuously moving forward, ensuring the safety of the child sitting in the child safety seat 6. Optionally, the at least two limiting ribs 636 are configured as ribs protruding towards both sides of the armrest 610 to form at least a partial V-shaped or U-shaped space between the at least two limiting ribs 636. Optionally, the limiting mechanism 630 may further include a protrusion (not shown) disposed on the other of the first surface 611 and the second surface 621, the protrusion having a shape that matches the space formed between at least two limiting ribs 636, such as at least a partial V-shape or U-shape. When the wing 620 presses against the armrest 610, the protrusion can enter the space formed between the at least two limiting ribs 636, that is, the at least two limiting ribs 636 clamp the protrusion to limit the lateral movement of the wing 620 relative to the armrest 610.

[0063] In a child safety seat with ISOFIX (International Standards Organization FIX, child safety seat restraint system) known to the inventors, the seat is provided with a release button for contacting the ISOFIX connector and a safety button for preventing accidental triggering of the release button. If the release button is pressed without pressing the safety button, the ISOFIX connector cannot be released, thus preventing accidental triggering; when both the safety button and the release button are pressed simultaneously, the ISOFIX connector unlocks, thereby separating the child safety seat from the car. The unlocking directions of the safety button and the release button are on the same straight line or two parallel straight lines, and their unlocking directions are close to each other. Furthermore, since the release button and the ISOFIX connector are mostly rigidly connected, the fore-and-aft position of the ISOFIX connector relative to the backrest of the child safety seat is adjustable. Therefore, in the child safety seats known to the inventors, the release button is usually located on the housing of the ISOFIX connector and moves back and forth with the ISOFIX connector relative to the backrest.

[0064] Referring to FIG32, a child safety seat 7 according to an embodiment of the present invention includes an ISOFIX safety release system 700. The ISOFIX safety release system 700 can be detachably connected to the vehicle's ISOFIX interface (not shown).

[0065] Referring to Figures 33-34, the ISOFIX safety release system 700 includes an ISOFIX connector 720, a first release device 710, and a second release device 730. The ISOFIX connector 720 is switchable between a locked state and an unlocked state. When the ISOFIX connector 720 is in the locked state, it is locked to the vehicle's ISOFIX interface; when it is in the unlocked state, it is detached from the vehicle's ISOFIX interface. The first release device 710 is operably directly or indirectly connected to the ISOFIX connector 720 to release the ISOFIX connector 720. The first release device 710 includes a first release operating part 712. The first release operating part 712 is slidable between a locked position and an unlocked position. When the first release operating part 712 switches from the locked position to the unlocked position, the first release device 710 can switch the ISOFIX connector 720 from the locked state to the unlocked state. The second release device 730 is operatively connected to the first release device 710. The second release device 730 includes a second release operating part 7311. The second release operating part 7311 is slidable between a secured position and a free position. When the second release operating part 7311 is in the secured position, the second release device 730 locks the first release operating part 712 in the locked position. The sliding direction of the first release operating part 712 is not parallel to the sliding direction of the second release operating part 7311. In this embodiment, the sliding direction of the first release operating part 712 is perpendicular to the sliding direction of the second release operating part 7311. Specifically, the first release operating part 712 slides along the longitudinal direction of the child safety seat 7, and the second release operating part 7311 moves along the lateral direction of the child safety seat 7, where the longitudinal direction refers to the direction the child faces when riding in the child safety seat 7, and the lateral direction is the direction perpendicular to the longitudinal direction. For example, in some embodiments, the sliding direction of the first unlocking operation unit 712 intersects the sliding direction of the second unlocking operation unit 7311. For instance, the sliding direction of the first unlocking operation unit 712 from the locked state to the unlocked state forms an angle of less than 45 degrees with the sliding direction of the second unlocking operation unit 7311 from the locked state to the unlocked state. In other embodiments, the sliding direction of the first unlocking operation unit 712 is parallel to and far from the sliding direction of the second unlocking operation unit 7311. For instance, the sliding direction of the first unlocking operation unit 712 from the locked state to the unlocked state is exactly opposite to the sliding direction of the second unlocking operation unit 7311 from the locked state to the unlocked state.

[0066] Specifically, as shown in FIG35, the first release device 710 includes a first engagement portion 7120 and a second engagement portion 7125 connected to the first release operation portion 712. In FIG35, the first release operation portion 712 is in the locked position, and the second release device 730 is in the safe position. The second release device 730 has a third engagement portion 7310. When the first release operation portion 712 is in the locked position and the second release operation portion 7311 is in the safe position, the third engagement portion 7310 cooperates with the first engagement portion 7120 to lock the first release operation portion 712 in the locked position. In this embodiment, the first engagement portion 7120 is a slot, and the third engagement portion 7310 is a hook. As shown in FIG43, when the first release operation portion 712 is in the release position and the second release device 730 is in the free position, the third engagement portion 7310 cooperates with the second engagement portion 7125 to lock the first release operation portion 712 in the release position.

[0067] As shown in Figures 33 and 37, the first release operation part 712 includes a first pressing part 7121 for the user to push the first release operation part 712 to slide. The first pressing part 7121 is a pressing surface that is generally perpendicular to the sliding direction of the first release operation part 712. When the second release operation part 7311 is in the locked position, the side wall of the second release operation part 7311 blocks at least a portion of the first pressing part 7121 to prevent the user from accidentally operating the first release operation part 712 before operating the second release operation part 7311. When the second release operation part 7311 is in the free position, the side wall of the second release operation part 7311 disengages from the first pressing part 7121, so that the first pressing part 7121 is exposed, so that the user can push the first pressing part 7121 by hand to slide the first release operation part 712.

[0068] As shown in FIG33, the first release device 710 includes a fixing base 711. The fixing base 711 is fixedly mounted on the child safety seat 7. When the ISOFIX connector 720 slides back and forth in the longitudinal direction, the position of the fixing base 711 does not change accordingly, so as to facilitate user operation. The fixing base 711 defines a third receiving space 7110, and the first release operation part 712 is slidably disposed in the third receiving space 7110 and can slide from the locked position to the released position in a direction away from the second release operation part 7311. When the user attempts to unlock the ISOFIX connector 720 with one hand, the user first presses the second release operation part 7311 with his thumb toward the child safety seat, pressing the second release operation part 7311 from the locked position to the free position; then he pushes the first release operation part 712 away from the second release operation part 7311 (thumb) with his index finger. Because the force a human hand's muscles can provide to push the index finger away from the thumb is much less than the force they can provide to pull the index finger closer to the thumb, it is difficult for a user to unlock the ISOFIX connector 720 with one hand, or to accidentally lock it by simultaneously activating the first release operation 712 and the second release operation 7311 while adjusting the fore-and-aft distance of the ISOFIX connector 720 relative to the backrest. Therefore, this effectively prevents accidental unlocking by children while riding in a child safety seat. In other embodiments, the first release operation 712 can also slide from the locked position to the unlocked position along the direction closer to the second release operation 7311.

[0069] As shown in FIG33, an observation window 7111 is provided on the side of the mounting base 711 away from the child safety seat 7. A first pressing part 7121 is located inside the observation window 7111. The first release operation part 712 also includes a color indicator 7122 connected to the first pressing part 7121. The color indicator 7122 may be marked as green, for example. When the first release operation part 712 is in the locked position, the color indicator 7122 is exposed inside the observation window 7111 and can be observed by the user, indicating to the user that the ISOFIX connector 720 has been locked. By applying a pushing force to the first pressing part 7121, the first release operation part 712 slides from the locked position to the unlocked position. As shown in FIG41, when the first release operation part 712 is in the unlocked position, the color indicator 7122 is obscured by the mounting base 711 and cannot be observed by the user, indicating to the user that the ISOFIX connector 720 is in an unlocked state.

[0070] As shown in Figures 35, 39, and 43, the first unlocking device 710 further includes a first guide 7124 located at the end of the first unlocking operation portion 712 away from the second unlocking device 730. A second guide 7112 is provided on the fixing base 711 at a position corresponding to the first guide 7124. The first guide 7124 cooperates with the second guide 7112 to guide the sliding of the first unlocking operation portion 712. In this embodiment, the first guide 7124 is a second slide groove, and the second guide 7112 is a pin that can slide within the second slide groove, but is not limited thereto.

[0071] As shown in Figures 35, 39, and 43, the second release device 730 includes a main body 731. The main body 731 has a limiting space 7312, which is disposed between the third engagement portion 7310 and the second release operation portion 7311. When the second release operation portion 7311 is in the locked position, a portion of the first release operation portion 712 enters the limiting space 7312, so that the third engagement portion 7310 engages with the first engagement portion 7120. When the second release operation portion 7311 is in the free position, this portion of the first release operation portion 712 disengages from the limiting space 7312, thereby facilitating the user to slide the first release operation portion 712.

[0072] As shown in Figures 35, 39, and 43, the second release device 730 further includes a fifth elastic member 732 connected to the second release operation part 7311. The fifth elastic member 732 has a tendency to slide the second release operation part 7311 from the free position toward the locked position. In this embodiment, the fifth elastic member 732 is a spring. The third engagement part 7310 has a first surface and a second surface relative to the first surface, wherein the first surface of the third engagement part 7310 is a plane located in a direction away from the first release device 710, and the second surface of the third engagement part 7310 is a miter surface 73101 located in a direction close to the first release device 710. The second engagement part 7125 is provided with a stepped surface 71251. Referring to Figure 35, when the second release device 730 is in the safety position and the first release operation part 712 is in the locked position, the third engagement part 7310 contacts the first surface of the first release device 710 through its first surface, locking the first release device 710 in the locked position. Referring to Figure 43, when the second release device 730 is in the free position and the first release operation part 712 is in the release position, the inclined surface 73101 abuts against the stepped surface 71251 (i.e., the second surface of the first release device 710). Under the action of the fifth elastic member 732, the third engagement part 7310 restricts the movement of the first release operation part 712 toward the second release device 730, thereby locking the first release operation part 712 in the release position. Referring to Figure 47, the first release operation part 712 is in the release position. When the ISOFOX connector 720 abuts against the ISOFIX interface of the vehicle seat, the ISOFOX connector 720 switches to the locked state. The second connector 740 (described later) pulls the first drive member 713 (described later) to rotate counterclockwise, thereby causing the first release operation part 712 to slide to the left. Referring to Figure 43, the stepped surface 71251 presses against the inclined surface 73101 to the left, causing relative sliding at the contact surface of the two, thereby releasing the lock between the stepped surface 71251 and the inclined surface 73101. As a result, the first release operation part 712 slides from the unlocked position to the locked position, and the second release operation part 7311 slides from the free position to the locked position. The length of the first surface of the first release device 710 perpendicular to its sliding direction is greater than the length of the second surface perpendicular to its sliding direction, or the contact area between the first surface of the third joint 7310 and the first surface of the first release device 710 is greater than the contact area between the second surface of the third joint 7310 and the second surface of the first release device 710, so that when the first release device 710 is locked in the unlocked state, it can be easily driven by the ISOFOX connector 720 to switch to a multi-locked state. In this embodiment, the first release device 710 does not have an elastic member for resetting the first release operation part 712 from the unlocked position to the locked position. The first release operation part 712 is reset by pulling a steel wire, thereby simplifying the structure of the first release device 710.In other embodiments, an elastic element may be provided on the first release device 710, which biases the first release operation part 712 from the unlocked position toward the locked position, thereby making it easier for the first release device 710 to be reset to the locked position.

[0073] Referring to Figures 44-47, the first release device 710 also includes a first drive member 713. The first drive member 713 is pivotally mounted on the child safety seat 7. The ISOFIX connector 720 is operably connected to the first release operation unit 712 via the first drive member 713.

[0074] Specifically, as shown in FIG47, the first drive member 713 includes a pivot shaft 7133 disposed on the child safety seat 7 and a first arm 7131 and a second arm 7132 located on both sides of the pivot shaft 7133. The first arm 7131 is operably connected to a first release operation part 712, and the second arm 7132 is operably connected to an ISOFIX connector 720. The length of the first arm 7131 is greater than the length of the second arm 7132, thereby reducing the force required to unlock the ISOFIX connector 720 through the first release operation part 712.

[0075] As shown in Figures 47 and 49, the first release operation unit 712 further includes a pivot space 7123. The first arm 7131 is rotatably disposed within the pivot space 7123. Sliding of the first release operation unit 712 can drive the first arm 7131 to rotate about the pivot axis 7133.

[0076] As shown in Figures 47-50, the ISOFIX safety release system 700 also includes a second connector 740. One end of the second connector 740 is fixedly connected to the second arm 7132, and the other end is fixedly connected to the ISOFIX connector 720. The second arm 7132 is operably connected to the ISOFIX connector 720 via the second connector 740. In this embodiment, the second connector 740 is a steel wire, but it is not limited to this and can also be a connecting rod, etc. When the ISOFIX connector 720 switches from the release state to the lock state, the second connector 740 can also drive the first release operation part 712 to slide from the release position to the lock position. In addition, the first drive member 713 also acts as a steering mechanism. As shown in Figure 47, when the first release operation part 712 moves from the locked position to the release position, that is, slides from the left side to the right side of the figure, it drives the first drive member 713 to rotate clockwise. At this time, the second arm 7132 pulls the steel wire 740 from right to left, thereby changing the direction of motion transmission and making the user's release sliding direction more natural. Through the pivoting structure of the first drive member 713 and the transmission method of the steel wire, the first release operation part 712 can be positioned away from the ISOFIX connector 720, thus facilitating user operation.

[0077] As shown in Figures 45, 48, and 50, the ISOFIX connector 720 includes a housing 7201, a bracket 7202, a second drive member 7203, a second engaging member 7204, a hook 7205, a limiting element 7206, a sixth elastic member 7207, and a seventh elastic member 7208. The housing 7201 is generally elongated, and the bracket 7202 is disposed inside the housing 7201. A second groove 72021 is defined inside the bracket 7202. The second drive member 7203 is slidably disposed in the second groove 72021. The second drive member 7203 is also operably connected to a first release operation part 712 via a second connector 740 and a first drive member 713. The second engaging member 7204 is fixedly connected to the second drive member 7203. The hook 7205 is pivotally fixed to the bracket 7202 via a pin 72054 and is disposed in the second groove 72021. The hook 7205 is pivotable between a connected position and a released position. A limiting member 7206 is fixedly connected to the bracket 7202. One end of a sixth elastic member 7207 is connected to the limiting member 7206, and the other end is connected to the second drive member 7203. The sixth elastic member 7207 is used to give the second drive member 7203 a tendency to slide away from the child safety seat 7. A seventh elastic member 7208 is provided on the pin 72054 and is used to give the hook 7205 a tendency to rotate from the connected position to the released position. In this embodiment, the seventh elastic member 7208 is a torsion spring. The hook 7205 has a boss 72051. The boss 72051 has a first surface 72052 abutting against the second engaging member 7204, and the boss 72051 also has a second surface 72053 adjacent to the first surface 72052. The second surface 72053 is used to contact the second drive member 7203. The second driving member 7203 is provided with a third surface 72032 for contacting the second surface 72053. The second surface 72053 and the third surface 72032 have approximately the same curvature. When the second surface 72053 contacts the third surface 72032, the second surface 72053 is able to slide relative to the third surface 72032.

[0078] The working process of the ISOFIX safety release system 700 described above is briefly described below.

[0079] As shown in Figures 47 and 48, when the ISOFIX connector 720 is in the locked state, it can lock with the vehicle's ISOFIX interface. At this time, the first release operation part 712 is in the locked position, and the second release operation part 7311 is in the safe position. The side wall of the second release operation part 7311 blocks at least a portion of the first press part 7121, making it difficult for a child to operate the first press part 7121. As shown in Figure 35, when the second release operation part 7311 is in the safe position, a portion of the first release operation part 712 enters the limiting space 7312, so that the third engagement part 7310 cooperates with the first engagement part 7120 to lock the first release operation part 712 in the locked position, preventing a child from operating the first release operation part 712. Additionally, when the IOSFIX connector 720 is locked, the hook 7205 pivots to the connection position, and the second drive member 7203 slides away from the child safety seat 7 under the action of the sixth elastic member 7207 until the second engaging member 7204 abuts against the hook 7205, restricting the pivoting of the hook 7205 to lock the hook 7205 in the connection position, thereby locking the IOSFIX connector 720 in the locked state.

[0080] When it is necessary to unlock the ISOFIX connector 720, the second release operation part 7311 can be pressed first. When the second release operation part 7311 is in the free position, the side wall of the second release operation part 7311 disengages from the first pressing part 7121, so that the first pressing part 7121 is exposed to the outside, so that the user can operate the first pressing part 7121 by hand. At this time, this part of the first release operation part 712 disengages from the limiting space 7312, and the third engaging part 7310 separates from the first engaging part 7120, that is, the first release operation part 712 is no longer locked in the release position. When the first pressing part 7121 is operated to slide from the locked position to the release position in a direction away from the second release operation part 7311, the sliding of the first release operation part 712 can drive the first arm 7131 of the first drive member 713 to rotate around the pivot axis 7133, thereby driving the second arm 7132 of the first drive member 713 to pull the second connector 740. The second drive member 7203 of the ISOFIX connector 720 slides towards the child safety seat 7 in the second slide groove 72021 under the pull of the second connector 740. The second engaging member 7204 disengages from the hook 7205, no longer restricting the pivoting of the hook 7205. Under the action of the seventh elastic member 7208, the hook 7205 rotates from the connected position to the released position. At this time, the ISOFIX connector 720 is in the unlocked state, thus allowing it to be separated from the vehicle's ISOFIX interface.

[0081] The ISOFIX safety release system 700 of one or more of the above embodiments has the following technical effects:

[0082] After adjusting the second release operation unit 7311 to the free position, the first release operation unit 712 is slid to the release position to prevent accidental release by the user or a child.

[0083] The unlocking direction of the second release operation unit 7311 is orthogonal to that of the first release operation unit 712. Compared with the known technology, the sliding direction of the second release operation unit and the first release operation unit is parallel or on the same straight line, which can effectively reduce the probability of accidental touch.

[0084] The first release operation unit 712 is locked by the second release operation unit 7311 in both the locked and released positions. The locking of the first release operation unit 712 in the locked position by the second release operation unit 7311 is intended to prevent accidental release due to accidental activation. The locking of the first release operation unit 712 in the released position by the second release operation unit 7311 is intended to keep the ISOFIX connector 720 in the released state, facilitating the installation of the child safety seat and simplifying the structure of the ISOFIX system.

[0085] The color indicator 7122 exposes the color indicator in the locked position and hides the color indicator in the unlocked state, so that the user can understand the current locked state of the ISOFIX connector 720.

[0086] The first drive member 713 enables the release of the lock by sliding the first release operation part 712 away from the ISOFIX hook 7205, which is the same as the disassembly direction of the ISOFIX connector, making operation convenient.

[0087] The first drive member 713 can adjust the stroke of the release operation part by changing the length ratio of the first arm 7131 and the second arm 7132. A longer stroke can better prevent accidental activation.

[0088] The first driving member 713 enables the first release operation part 712 to be set at a different height from the ISOFIX connector 720, so as to flexibly set the position of the first release operation part 712 for easy operation.

[0089] The technical features of the above embodiments can be combined in any way. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above embodiments only illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims. [Simplified Explanation of the Diagram]

[0014] The above and other objects, features, and advantages of the invention will become clearer from the more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally scaled to actual dimensions; the focus is on illustrating the gist of the invention. Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: FIG1 is a perspective view of a child safety seat according to an embodiment of the invention, wherein the seat plate is in a first position. FIG2 is a side view of a child safety seat according to an embodiment of the invention, wherein the seat plate is in a first position. FIG3 is a side view of a child safety seat according to an embodiment of the invention, wherein the seat plate is in a second position. FIG4A is a structural schematic diagram of the seat plate according to an embodiment of the invention. FIG4B is a structural schematic diagram of the seat plate according to an embodiment of the invention. FIG5 is a perspective view of a child safety seat according to an embodiment of the invention, wherein the seat plate is omitted. FIG6 is a top view of a child safety seat according to an embodiment of the invention, wherein the seat plate is in a second position. FIG7 is a cross-sectional view along line BB in FIG6. FIG8 is a cross-sectional view along line AA in FIG6. Figure 9 is a perspective view of a child safety seat according to an embodiment of the present invention, wherein the seat plate is in a second position. Figure 10 is a side view of a child safety seat according to an embodiment of the present invention, wherein the seat plate is in a second position. Figure 11 is a side view of a child safety seat according to an embodiment of the present invention, wherein the seat plate is in a first position. Figure 12 is a structural schematic diagram of the seat plate according to an embodiment of the present invention. Figure 13 is a perspective view of a child safety seat according to an embodiment of the present invention, wherein the seat plate is omitted. Figure 14 is a structural schematic diagram of the seat plate according to an embodiment of the present invention, wherein the side of the seat plate away from the base is removed. Figure 15 is a cross-sectional schematic diagram along line CC in Figure 13, wherein the backrest structure is partially omitted. Figure 16A is a cross-sectional schematic diagram along line DD in Figure 13, wherein the backrest structure is partially omitted. Figure 16B is an enlarged schematic diagram of the seat belt portion in Figure 16A. Figure 17A is a schematic diagram of the seat plate shown in Figure 16A sliding into the second position. Figure 17B is an enlarged schematic diagram of the seat belt portion in Figure 17A. Figure 18 is a partially exploded schematic diagram of a child safety seat according to an embodiment of the present invention. Figure 19 is a side view of a child safety seat according to an embodiment of the present invention. Figure 20 is a structural schematic diagram of the seat plate and base of a child safety seat according to an embodiment of the present invention. Figure 21 is a perspective view of a child safety seat according to an embodiment of the present invention. Figure 22 is a side view of the child safety seat shown in Figure 21. Figure 23 is an enlarged view of part E in Figure 22.Figure 24 is a base of a child safety seat according to an embodiment of the present invention. Figure 25 is a backrest of a child safety seat according to the embodiment shown in Figure 24. Figure 26 is a base of a child safety seat according to an embodiment of the present invention. Figure 27 is a backrest of a child safety seat according to the embodiment shown in Figure 26. Figure 28 is a base of a child safety seat according to an embodiment of the present invention. Figure 29 is a backrest of a child safety seat according to the embodiment shown in Figure 28. Figure 30 is a base of a child safety seat according to an embodiment of the present invention. Figure 31 is a backrest of a child safety seat according to the embodiment shown in Figure 30. Figure 32 is a perspective view of a child safety seat according to an embodiment of the present invention, wherein the first release operation part is in the locked position and the second release operation part is in the safe position. Figure 33 is a partial enlarged view of region F in Figure 32. Figure 34 is a cross-sectional view along line GG in Figure 32. Figure 35 is a partial enlarged view of region H in Figure 34. Figure 36 is a perspective schematic diagram of a child safety seat according to an embodiment of the present invention, wherein the first release operation part is in the locked position and the second release operation part is in the free position. Figure 37 is a partial enlarged view of region I in Figure 36. Figure 38 is a bottom view of a cross-sectional view along line JJ in Figure 36. Figure 39 is a partial enlarged view of region K in Figure 38. Figure 40 is a perspective view of a child safety seat according to an embodiment of the present invention, wherein the first release operation part is in the release position and the second release operation part is in the free position. Figure 41 is a partial enlarged view of region L in Figure 40. Figure 42 is a cross-sectional view along line MM in Figure 40. Figure 43 is a partial enlarged view of region N in Figure 42. Figure 44 is a partially exploded view of a child safety seat according to an embodiment of the present invention. Figure 45 is an exploded perspective view of the ISOFIX connector in Figure 44. Figure 46 is a perspective view of an ISOFIX safety release system according to an embodiment of the present invention. Figure 47 is a cross-sectional view along line OO in Figure 46, wherein the first release operation part is in the locked position. Figure 48 is a cross-sectional view along line PP in Figure 46, wherein the ISOFIX connector is in the locked state. Figure 49 is a cross-sectional view along line OO in Figure 46, wherein the first release operation part is in the release position. Figure 50 is a cross-sectional view along line PP in Figure 46, with the ISOFIX connector in the unlocked state.

Claims

1. A child safety seat, comprising: Crotch belt; A base, the base including a second through hole, through which the crotch strap passes; The seat plate is movable relative to the base in a first direction between a first position and a second position. The seat plate includes a first through hole for the crotch strap to pass through. When the seat plate is in the first position, the length of the crotch strap extending through the first through hole is a first length. When the seat plate is in the second position, the length of the crotch strap extending through the first through hole is a second length. The first length is less than the second length. The seat length of the child safety seat when the seat plate is in the first position is different from the seat length of the child safety seat when the seat plate is in the second position.

2. The child safety seat as described in claim 1, wherein the seat plate further includes an adjustment mechanism that operably locks the seat plate in the first position or the second position.

3. The child safety seat as described in claim 1, wherein the length of the child safety seat when the seat plate is in the first position is less than the length of the child safety seat when the seat plate is in the second position, wherein when the seat plate is in the first position, the projection of the second through hole in a vertical direction does not coincide with the projection of the first through hole in the vertical direction; and when the seat plate is in the second position, at least a portion of the projection of the second through hole in the vertical direction coincides with the projection of the first through hole in the vertical direction.

4. The child safety seat as described in claim 1, wherein the seat plate further includes a connecting portion that restricts the seat plate from moving vertically relative to the base; the connecting portion includes at least one first connecting portion disposed on the seat plate and at least one second connecting portion disposed on the base and cooperating with the at least one first connecting portion, the seat plate being slidably connected to the base through the cooperation of the first connecting portion and the second connecting portion, the first connecting portion being a protrusion fixedly disposed on the side of the seat plate facing the base and extending in a front-rear direction of the seat plate, the second connecting portion being a second connecting groove disposed on the side of the base facing the seat plate and the protrusion being inserted into the second connecting groove.

5. The child safety seat as described in claim 2, wherein the adjustment part includes a first adjustment part disposed on the seat plate, and a second adjustment part and a third adjustment part disposed on the base, wherein the first adjustment part cooperates with the second adjustment part to lock the seat plate in a first position; and the first adjustment part cooperates with the third adjustment part to lock the seat plate in a second position, wherein... The seat plate has a first receiving space defined inside. The first adjustment part is at least partially disposed in the first receiving space. The first adjustment part includes: an operating member that is slidable between a locked position and an adjusted position; and a first engaging member that is operably connected to the operating member and is slidable between an extended position and a retracted position. The first engaging member is adapted to engage with the second adjustment part and the third adjustment part. When the seat plate is in the first position, the operating member is slid to the locked position, causing the first engaging member to slide to the extended position, whereby the first engaging member engages with the second adjustment part, and the seat plate is fixed to the first position. When the operating member is slid to the adjusted position, causing the first engaging member to slide to the retracted position, the first engaging member disengages from the second adjustment part, and the seat plate is released from the first position. When the seat plate is in the second position, slide the operating member to the locking position, so that the first engaging member slides to the extended position and engages with the third adjusting part, and the seat plate is fixed to the second position; slide the operating member to the adjusting position, so that the first engaging member slides to the retracted position, the first engaging member disengages from the third adjusting part, and the seat plate is released from the second position.

6. The child safety seat as described in claim 5, wherein the first adjustment part further includes a first connector, one end of the first connector being fixedly connected to the operating member, the other end of the first connector being fixedly connected to a first engaging member, the first connector being a flexible connecting strip, and the first connector being integral with the operating member.

7. A child safety seat as described in any of claims 1 to 6, wherein a gap is formed between the front end of the base facing the seat plate and the front end of the base facing the seat plate, the gap being adapted to allow the crotch strap to pass through.

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