Child safety seat

Abstract

Disclosed is a child safety seat. The child safety seat comprises a safety belt, a backrest body, and a headrest part. A plurality of position slots and a rod used for winding the safety belt are formed on the backrest body. The headrest part is movably disposed on the backrest body and comprises a headrest body and a headrest adjustment mechanism. The headrest adjustment mechanism comprises a slide member and a headrest engagement member. The slide member is connected to the headrest body and is provided with a housing and a slide slot. The headrest engagement member is inserted through the slide slot and can move between a headrest locking position and a headrest unlocking position. When the headrest engagement member is at the headrest locking position, the headrest engagement member engages with one of the plurality of position slots, and when the headrest engagement member is switched to the headrest unlocking position, the slide member is separated from the position slot. The headrest body is provided with a safety belt insertion opening, and at least a portion of the housing is located above the safety belt insertion opening. A connecting line between the rod and the safety belt insertion opening passes through the housing, so that the safety belt arranged between the rod and the safety belt insertion opening presses against the housing.

Description

Child safety seat Technical Field

[0001] The present disclosure relates to the technical field of children's products, and in particular to a child safety seat. Background Art

[0002] Child safety seats provide safety for children while traveling in vehicles. To accommodate children of varying body shapes and heights, the headrest of a child safety seat is typically height-adjustable, allowing it to be positioned at different heights relative to the backrest, providing comfortable head support for the child. However, the headrest adjustment mechanism used in existing child safety seats is relatively complex. Furthermore, when used on bumpy roads, the mechanism can accidentally unlock, causing the headrest height to drop suddenly.

[0003] In addition, some child safety seats currently on the market are also equipped with booster cushions that can be fixed to the vehicle seat through the vehicle seat belt for use by older children. However, existing booster cushions have problems such as complex structures and inconvenience in disassembly. Summary of the Invention

[0004] A first aspect of the present disclosure provides a headrest with a simple structure and a child safety seat having the headrest. The child safety seat according to the first aspect includes a safety belt, a backrest body, and a headrest. The backrest body is formed with a plurality of gear slots and a rod for winding the safety belt. The headrest is movably mounted on the backrest body and includes a headrest body and a headrest adjustment mechanism. The headrest adjustment mechanism includes a slider and a headrest engaging member. The slider is connected to the headrest body and is provided with a housing and a sliding slot. The headrest engaging member is inserted into the sliding slot and is movable between a headrest locking position and a headrest unlocking position. When the headrest engaging member is in the headrest locking position, the headrest engaging member engages with one of the plurality of gear slots. When the headrest engaging member is switched to the headrest unlocking position, the slider disengages from the plurality of gear slots. The headrest body is provided with a safety belt insertion opening, with at least a portion of the housing being located above the safety belt insertion opening. The connecting line between the rod and the safety belt through-hole passes through the shell, so that the safety belt arranged between the rod and the safety belt through-hole can be pressed against the shell.

[0005] In the first aspect, the extension of the rear surface of the housing passes through the rod, so that the seat belt located in front of the rod is pressed against the slider, while the seat belt located in the rear of the rod is spaced apart from the slider.

[0006] In the first aspect, the lower end of the rear surface of the housing has a guide surface for guiding the seat belt, and the guide surface is an inclined surface or a convex cylindrical surface.

[0007] In the first aspect described above, the backrest body is provided with a sliding groove extending longitudinally of the backrest body and penetrating the surface of the backrest body. The sliding member is slidably engaged with the sliding groove such that at least a portion of the housing is disposed within the sliding groove. The rod is positioned above the sliding groove. A plurality of shift grooves are linearly distributed along both sides of the sliding groove, with the openings of the plurality of shift grooves facing away from the headrest body.

[0008] In the first aspect described above, the backrest body is provided with a first mating portion, the first mating portion extending in a direction parallel to the direction of extension of the sliding groove, and the sliding member is provided with a second mating portion. One of the first mating portion and the second mating portion is a groove, and the other of the first mating portion and the second mating portion is a rib, with the first mating portion and the second mating portion mating in a concave-convex manner.

[0009] In the first aspect mentioned above, the backrest body is provided with a plurality of shift ribs, and each shift groove is formed on the plurality of shift ribs at the same time. The opening direction of the plurality of shift grooves is away from the headrest body, and each shift groove has a downwardly inclined inclined surface, and the end of the inclined surface is formed with a stop protrusion for preventing the headrest engaging part from sliding off the inclined surface.

[0010] In the above first aspect, protrusions are respectively provided on both sides of the sliding groove, and the plurality of protrusions are respectively located above and / or below the shift groove.

[0011] In the first aspect, the axis of the rod is located in front of the extension surface of the rear surface of the housing. In the first aspect, the rod includes a rod body and a rotating sleeve rotatably mounted on the rod body, and the safety belt is suitable for being wound around the rotating sleeve.

[0012] In the first aspect described above, the headrest adjustment mechanism further includes a headrest driver, which is movably connected to the headrest portion and is drivingly connected to the headrest engaging member. The headrest engaging member includes a headrest engaging rod, which at least partially extends out of the sliding member. The headrest driver is provided with a drive groove, and the angle between the extension direction of the sliding groove and the extension direction of the drive groove is acute. The headrest engaging rod is disposed within the sliding groove and the drive groove and is capable of sliding along the extension direction of the sliding groove and the drive groove.

[0013] In the first aspect mentioned above, the sliding member has a first retaining groove, the first retaining groove is connected to the sliding groove, one end of the first retaining groove is an open end, and the other end of the first retaining groove is formed as a limiting end, and at least a part of the headrest driving member can be slidably arranged in the first retaining groove and is suitable for being stopped by the limiting end.

[0014] In the first aspect above, the headrest adjustment mechanism further includes a first reset member, which is disposed between the sliding member and the headrest driving member and is adapted to bias the headrest driving member to drive the headrest engaging rod to move toward the headrest locking position.

[0015] In the above-mentioned first aspect, the sliding member is provided with a first retaining groove and a second retaining groove which are interconnected, at least a portion of the headrest driving member is accommodated in the first retaining groove and is provided with an abutment surface, one end of the first return member is accommodated in the second retaining groove and abuts against the end portion of the second retaining groove, and the other end of the first return member extends into the first retaining groove and abuts against the abutment surface.

[0016] In the first aspect mentioned above, the headrest portion also includes a headrest operating member, which is operably arranged on the headrest body and is driven and connected to the headrest driving member. The headrest body is provided with a penetration channel. The headrest operating member also includes an operating portion and a connecting arm connected between the operating portion and the headrest driving member. The connecting arm extends along the longitudinal direction of the headrest body. The operating portion is movably arranged on the front side of the headrest body. At least a portion of the headrest driving member passes through the penetration channel and extends to the back side of the headrest body.

[0017] A second aspect of the present disclosure provides a booster seat cushion, comprising a seat cushion body, a connecting mechanism, and a retaining mechanism. The connecting mechanism is disposed on the seat cushion body and is adapted to connect to a backrest portion of a child safety seat. The connecting mechanism comprises a latching member, which is movably connected to the seat cushion body and is switchable between a latching locking position and a latching release position. The retaining mechanism is movably connected to the seat cushion body and is capable of switching between a retaining release position and a retaining locking position. When the retaining mechanism is in the retaining locking position, the retaining mechanism engages with the connecting mechanism, thereby maintaining the latching member in the latching release position. When the retaining mechanism is in the retaining release position, the retaining mechanism disengages from the connecting mechanism, thereby allowing the latching member to switch to the latching locking position.

[0018] In the second aspect, the retaining mechanism includes a retaining member connected to the seat cushion body and a third return member disposed between the retaining member and the seat cushion body. The retaining member includes a driving portion and a transmission portion connected to the driving portion, the transmission portion being configured to engage the connecting mechanism, the driving portion being configured to drive the retaining member toward a direction in which the retaining member is retained in the unlocked position, and the third return member being configured to bias the retaining mechanism toward a direction in which the retaining member is retained in the locked position.

[0019] In the above second aspect, the third restoring member includes a first elastic member, and the first elastic member is a compression spring, a tension spring or a spring.

[0020] In the above-mentioned second aspect, the driving part is rotatably arranged on a first pivot and as the driving part moves relative to the seat cushion body, the transmission part can rotatably abut against the first elastic member or release the abutment with the first elastic member, thereby switching the retaining mechanism between a retaining release position and a retaining lock position.

[0021] In the second aspect, the transmission unit includes a crossbar, the first elastic member is disposed between the crossbar and the seat cushion body, and the crossbar can switch between pressing against and pushing away from the first elastic member through movement of the driving unit relative to the seat cushion body.

[0022] In the above second aspect, the seat cushion body includes a first shell and a second shell, the first shell and the second shell are engaged with each other to form a seat cushion cavity of the booster cushion, and the seat cushion cavity is used to accommodate the connecting mechanism and the retaining mechanism.

[0023] In the above-mentioned second aspect, an opening is formed on the first shell, and the driving part includes a rotating protrusion pivotally connected to the transmission part through a first pivot. When the retaining mechanism is in the retaining locking position, the rotating protrusion protrudes from the opening to the outside of the seat cushion cavity; when the retaining mechanism is in the retaining releasing position, the rotating protrusion is accommodated in the seat cushion cavity.

[0024] In the second aspect above, the seat cushion body includes a guide groove recessed toward the inner space, and the opening is located in the guide groove; and the rotating protrusion has an inclined surface inclined toward the entrance of the guide groove.

[0025] In the above-mentioned second aspect, the engaging member includes an engaging connection portion, and the connecting mechanism also includes a first operating member, on which is formed an operating connection portion and an operating block integrally formed with the operating connection portion, the transmission portion is engaged with the operating block, and the engaging connection portion and the operating connection portion are slidably connected, so that the engaging member switches between the engaging locking position and the engaging release position, and the operating connection portion includes a driving groove, and the engaging connection portion is a rod, which is connected to the driving groove and slides in the driving groove, thereby allowing the engaging member to switch between the engaging locking position and the engaging release position.

[0026] In the above-mentioned second aspect, the connecting mechanism also includes a fourth reset member, one end of which is connected to the seat cushion body and the other end is connected to the engaging member. Through sliding between the engaging connection part and the operating connection part, the fourth reset member biases the engaging member toward the engaging locking position. The fourth reset member includes a second elastic member, which is a spring or a spring.

[0027] In the second aspect, the engaging member includes an engaging pin, and the seat cushion body includes a seat cushion engaging hole. The engaging pin can be inserted into the seat cushion engaging hole and protrude from the seat cushion engaging hole, thereby switching between the engaging locking position and the engaging releasing position.

[0028] In the second aspect, the operating block further comprises a first limiting hole extending a certain length along its movement direction. The first operating member comprises a limiting post which passes through the first limiting hole and is fixed in the seat cushion body, thereby enabling the first operating member to move relative to the seat cushion body.

[0029] In the above-mentioned second aspect, an operating recess is also formed on the operating block, and the seat cushion body includes a snap-fit ​​opening, the operating recess is formed in a manner of being recessed from the outside toward the inside of the seat cushion body and exposed outward from the snap-fit ​​opening, and the seat cushion body includes a second limiting rib, which is arranged along the movement direction of the first operating member, so that the first operating member abuts against the second limiting rib.

[0030] In the above-mentioned second aspect, a limiting protrusion is also formed on the operating block, and the limiting protrusion protrudes from the side of the operating block opposite to the outwardly exposed surface of the operating recess, and a locking recess that matches the shape of the limiting protrusion is formed on the second limiting rib, and the limiting protrusion is engaged or disengaged with the locking recess as the engaging part switches between the engaging locking position and the engaging releasing position.

[0031] In the above second aspect, the seat cushion body further includes armrests, which are arranged on both sides of the seat cushion body and extend upward from the upper surface of the seat cushion body at a certain angle to the upper surface, and form a first set of holes suitable for the vehicle seat belt to pass through.

[0032] In the second aspect described above, the armrest portion includes a storage recess formed by a portion of the seat cushion body outside the seat cushion cavity and having a storage space. The storage recess includes a storage connection hole and a connection groove. The booster seat cushion also includes a storage cup, which includes a connection post protruding from the bottom of the cup and a cup connection protrusion protruding from the side of the cup. The connection post is insertable into the storage connection hole, and the cup connection protrusion engages with the connection groove.

[0033] A third aspect of the present disclosure provides a child safety seat. The child safety seat includes a backrest portion and a booster cushion according to the second aspect. The booster cushion is detachably connected to the backrest portion. The backrest portion includes a retainer driving unit that, when the booster cushion is connected to the backrest portion, drives the retaining mechanism relative to the cushion body to the retaining release position, thereby allowing the engaging member to switch to the engaging lock position.

[0034] In the third aspect, the backrest portion includes a backrest body, the backrest body further including a backrest limiting rib and a latching member receiving portion. The seat cushion body includes a mating rib, the backrest limiting rib cooperates with the mating rib to limit relative movement between the backrest portion and the booster cushion, and the latching member receiving portion engages with the latching member.

[0035] In the above-mentioned third aspect, the engaging member includes a engaging pin, the engaging member receiving portion includes a backrest engaging hole, the engaging pin is inserted into the backrest engaging hole, the backrest portion includes a reinforcement tube, the reinforcement tube is fixedly installed in the backrest body and extends from the backrest upper part of the backrest body to the backrest lower part, and includes a first reinforcement hole at a position opposite to the engaging member receiving portion, and the engaging member is inserted into the first reinforcement hole through the engaging member receiving portion.

[0036] In the third aspect, the retainer driving portion includes a driving protrusion configured to push the retaining mechanism toward a retaining release position when the booster cushion is connected to the backrest.

[0037] In the above-mentioned third aspect, the child safety seat also includes a base and an angle adjustment mechanism, the base includes a base body, a joint and a pivot part, the pivot part and the joint part extend upward from the base body at a certain angle relative to the base body, the joint part is engaged with the angle adjustment mechanism and the pivot part is rotatably connected to the backrest body of the backrest part through a second pivot, the angle adjustment mechanism is movably connected to the base and movably connected to the backrest part, so as to adjust the angle of the backrest part relative to the base.

[0038] In the third aspect, the angle adjustment mechanism includes a fifth return member and a second operating member. One end of the fifth return member is connected to the backrest portion and is movable relative to the backrest portion, and the other end is connected to the second operating member. One end of the second operating member is rotatably connected to the backrest body via a third pivot, and the other end is movably connected to the base. When a force is applied to the backrest portion, the second operating member causes the backrest portion to move relative to the base via the fifth return member.

[0039] In the above-mentioned third aspect, the fifth reset member includes a third elastic member, one end of the third elastic member is connected to the backrest body, the second operating member includes a rotating part and a sliding part, the rotating part is rotatably connected to the backrest body, and one end of the sliding part is connected to the base and the other end is connected to the third elastic member and can slide relative to the base, the base includes a gear part protruding from the base body, the gear part includes at least one angular gear slot, and the at least one angular gear slot is formed at an angle inclined upward from the base body along the running direction of the fifth reset member, the sliding part includes a base foot that cooperates with the gear part, and the gear pin passes through the base foot and engages with the angular gear slot.

[0040] In the third aspect above, the shift portion further includes an angular shift rib, which at least partially surrounds the angular shift groove in the moving direction of the shift pin, thereby stopping the shift pin in the angular shift groove.

[0041] In the third aspect, the child safety seat further comprises a reinforcement tube, which is fixedly mounted in the backrest portion and comprises a second reinforcement hole at a position relative to the second pivot, and the second pivot is inserted into the second reinforcement hole through a connection hole in the backrest body.

[0042] In the third aspect, the backrest body of the backrest portion includes a storage recess above the booster cushion. The storage recess is formed by the backrest body being recessed toward a side opposite to the side where the backrest portion and the booster cushion surround. The backrest portion includes a cover that is rotatably inserted into the backrest body and closes the storage recess.

[0043] In the third aspect, the cover body is formed with a resilient finger and a window. The resilient finger protrudes from one end of the cover body and is curved. The resilient finger protrudes from the window toward a side of the storage recess when the cover body is closed. The resilient finger includes a positioning step protruding from a surface of the resilient finger near a free end. The storage recess includes a positioning rib protruding from the backrest body toward the storage recess. The positioning step can be engaged with the positioning rib, thereby closing the storage recess.

[0044] In the third aspect, the child safety seat further includes a headrest detachably assembled on an upper portion of the backrest and adapted to receive a child's head. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. It is clear that the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0046] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various components are drawn only for illustrative purposes and are not necessarily drawn to true scale.

[0047] FIG1 shows a perspective view of a child safety seat according to an embodiment of the present disclosure;

[0048] FIG2 shows a perspective view of the child safety seat in FIG1 with the headrest adjusted higher;

[0049] FIG3 shows a perspective view of the child safety seat in FIG1 from another perspective, wherein the child safety seat is equipped with a seat belt;

[0050] FIG4 shows a perspective view of the child safety seat in FIG2 from another perspective after one of the sliding members is removed;

[0051] FIG5 shows a partial view of a cross-sectional view of the child safety seat along line U1 - U1 in FIG3 ;

[0052] FIG6 shows a partial view of a cross-sectional view of the child safety seat in FIG3 along line U1-U1 after the headrest portion is raised;

[0053] FIG7 shows a cross-sectional view of the child safety seat along line U2-U2 in FIG1 ;

[0054] FIG8 shows a perspective view of a headrest according to an embodiment of the present disclosure;

[0055] FIG9 shows a perspective view of the headrest in FIG7 with one of the slides removed;

[0056] FIG10 shows a perspective view of the headrest portion in FIG8 at another viewing angle;

[0057] FIG11 shows a cross-sectional view of the headrest portion along line U3-U3 in FIG10; and

[0058] FIG. 12 illustrates a perspective view of a slider according to an embodiment of the present disclosure.

[0059] FIG13 illustrates a perspective view of a child safety seat according to another embodiment of the present disclosure;

[0060] FIG14 shows a perspective view of the booster cushion of FIG13;

[0061] FIG15 shows a perspective view of the child safety seat of FIG13 with the booster cushion removed;

[0062] FIG16 shows a perspective view of the booster cushion in FIG14 from another perspective;

[0063] FIG17 shows a perspective view and a partially enlarged view of the child safety seat of FIG13 with the booster cushion removed;

[0064] FIG18 is a bottom oblique view of the booster cushion in FIG13;

[0065] FIG19 is a cross-sectional view and a partially enlarged view of the child safety seat along line A1-A1 in FIG13 , wherein the booster cushion is fully integrated into the child safety seat;

[0066] FIG20 shows a cross-sectional view and a partial enlarged view of the child safety seat taken along line A2-A2 of FIG13 , wherein the booster cushion has not yet been fully assembled into the child safety seat;

[0067] 21 illustrates a perspective view of a booster cushion according to an embodiment of the present disclosure with the second shell removed, wherein the connection mechanism is in an engaged and locked position;

[0068] FIG22 shows a cross-sectional view of the child safety seat along line BB in FIG13 , wherein the connecting mechanism is in the engaged and locked position;

[0069] FIG23 illustrates a perspective view of a booster cushion according to an embodiment of the present disclosure with the second shell removed, wherein the connection mechanism is in an engaged and unlocked position;

[0070] FIG24 illustrates a perspective view of a booster cushion from another perspective according to an embodiment of the present disclosure, showing the bottom of the booster cushion with the connection mechanism in an engaged and unlocked position;

[0071] FIG25 illustrates a perspective view of the booster cushion according to one embodiment of the present disclosure from another perspective after the second shell is removed, wherein the connecting mechanism is in an engaged and locked position;

[0072] FIG26 illustrates a view of a booster cushion according to an embodiment of the present disclosure from another perspective, wherein the connecting mechanism is in an engaged and locked position;

[0073] FIG27 shows a perspective view of the child safety seat in FIG13 from another perspective;

[0074] FIG28 shows a cross-sectional view of the child safety seat along CC in FIG27 , wherein the angle adjustment mechanism is adjusted to a minimum height relative to the base;

[0075] FIG29 shows a cross-sectional view of the child safety seat along CC in FIG28 , wherein the angle adjustment mechanism is adjusted to another height relative to the base;

[0076] FIG30 illustrates a perspective view of a base according to an embodiment of the present disclosure;

[0077] FIG31 is a bottom schematic diagram of a child safety seat with the base removed according to an embodiment of the present disclosure;

[0078] FIG32 is a schematic diagram showing a cross section of the child safety seat in FIG27 taken along DD;

[0079] FIG33 illustrates a perspective view of a child safety seat according to an embodiment of the present disclosure, wherein a storage cup on one side is removed;

[0080] FIG34 shows a perspective view of a storage cup;

[0081] FIG35 shows a perspective view of the child safety seat in FIG13 from another perspective, with the cover closing the storage recess;

[0082] FIG36 shows a cover according to an embodiment of the present disclosure;

[0083] FIG37 is a schematic diagram of the child safety seat of FIG35 with the cover removed; and

[0084] 38 illustrates a partially exploded view of a child safety seat with the seat shell removed, according to an embodiment of the present disclosure.

[0085] Reference numerals 10, child safety seat; 200, base; 201, base upper shell; 202, base lower shell; 210, base body; 211, base upper surface; 220, shift portion; 221, angle shift groove; 222, angle shift rib; 223, recessed platform; 230, joint portion; 240, pivot portion; 100, seat assembly; 1000, backrest portion; 1100, backrest body; 1110, front side of backrest body; 1120, back side of backrest body; 1200, sliding groove; 1210, first sliding groove; 1220, second sliding groove; 1300, gear rib; 1310, first gear rib; 1320, second gear rib; 1330, third gear rib; 1400, gear groove; 1400a, first gear recess; 1400b, second gear recess; 1400c, third gear recess; 1410, upper side wall of gear groove; 1411, limiting protrusion; 1420, lower side wall of gear groove; 1421, stopping protrusion; 1430, bottom wall of gear groove; 1500, first mating portion; 1600, protrusion; 1610, first protrusion; 1620, second protrusion; 1700, reinforcement rod; 1710, rod body; 1720, rotating sleeve; 2000, seat; 2100, seating surface; 3000, headrest; 3100, headrest body; 3111, front side of headrest body; 3112, back side of headrest body; 3120, mounting portion; 3130, seatbelt insertion opening; 3140, insertion channel; 3150, adapter; 3200, headrest adjustment mechanism; 3210, headrest engaging member; 3211, headrest engaging rod; 3220, headrest operating member; 3221, operating portion; 3222, connecting arm; 3223, operating connection portion; 3225, abutting surface; 3226, accommodating recess; 3227, connecting opening; 3230, sliding member; 3231, housing; 3232, upper side surface; 3233, guiding surface; 3234, sliding groove; 3235, second matching portion; 3236, first retaining groove; 3237, limiting end portion; 3238, second retaining groove; 3239, first boss; 3240, first restoring member; 3250, second restoring member; 3260, headrest driving member; 3261, driving groove; 3300, fixing seat; 3310, limiting portion; 3311, limiting wall portion; 3312, connecting ear portion; 3313, limiting pin; 3320, seat body portion; 3321, accommodating groove; 3330, limiting space; 3340, second boss; 4000, backrest portion; 4100, backrest body; 4111, backrest upper portion; 4112, backrest lower portion; 4120, backrest limiting rib; 4130, engaging member receiving portion; 4131, backrest engaging hole; 4140, retaining member driving portion; 4141, driving protrusion; 4142, recess; 4150, connecting hole; 4160, storage recess; 4161, positioning rib; 4162, storage connecting groove;4200, cover; 4210, elastic finger; 4211, positioning step; 4220, window; 4230, handle; 4240, cover connecting rod; 4300, reinforcement tube; 4310, first reinforcement hole; 4320, second reinforcement hole; 5000, booster cushion; 5100, seat cushion body; 5111, first shell; 5112, second shell; 5113, seat cushion cavity; 5121, upper surface; 5122, lower surface; 5130, first limiting rib; 5140, second limiting rib; engaging recess 5141; guide groove 5150; opening 5151; seat cushion engaging hole 5160; armrest portion 5170; 5171, first set of holes; 5172, storage recess; 5172a, storage connection hole; 5172b, connecting groove; 5180, matching rib; 5190, engaging opening; 5200, connecting mechanism; 5210, engaging member; 5211, engaging connection portion; 5212, engaging pin; 5220, first operating member; 5221, Operation connecting portion; 5221a, driving groove; 5222, operating block; 5222a, blocking rib; 5222b, first limiting hole; 5222c, operating recess; 5222d, limiting protrusion; 5222e, operating block space; 5230, fourth reset member; 5231, second elastic member; 5240, limiting post; 5300, holding mechanism; 5310, retaining member; 5311, driving portion; 5311a, rotating protrusion; 5312, transmission portion; 5312a, crossbar; 5312b, engaging end; 5320, third reset member; 5321, first elastic member; 5400, storage cup; 5410, connecting post; 5420, cup connecting protrusion; 6000, angle adjustment mechanism; 6100, fifth reset member; 6110, third elastic member; 6200, second operating member; 6210, rotating portion; 6220, sliding portion; 6221, mating inclined surface; 7100, first pivot; 7200, second pivot; 7300, third pivot; 7400, shift pin. 300, seat belt; S, extension surface; L, left; R, right; F, front; B, rear. DETAILED DESCRIPTION

[0086] To make the above-mentioned objects, features, and advantages of the present disclosure more clearly understood, specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without violating the scope of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed below.

[0087] When a feature or element is referred to herein as being "on" another feature or element, it can be directly on the other feature or element, or there can be intervening features and / or elements. Conversely, when a feature or element is referred to as being "directly" on another feature or element, there are no intervening features or elements. It should also be understood that when a feature or element is referred to as being "connected," "attached," or "engaged" to another feature or element, it can be directly connected, attached, or engaged to the other feature or element, or there can be intervening features or elements. Conversely, when a feature or element is referred to as being "directly connected," "directly attached," or "directly engaged" to another feature or element, there are no intervening features or elements.

[0088] Although the terms "first" and "second" may be used herein to describe various features or elements, these features or elements should not be limited by these terms unless otherwise specified. These terms can be used to distinguish one feature or element from another. Thus, the first feature or element discussed below can be referred to as the second feature or element, and similarly, the second feature or element discussed below can be referred to as the first feature or element. As used herein, "plurality" means at least two, for example, two, three, etc., unless otherwise explicitly and specifically defined. Words such as "a" or "an" do not necessarily indicate a quantitative limitation. Words such as "include" or "comprising" mean that the element or object listed before the word includes the elements or objects listed after the word, and their equivalents, without excluding other elements or objects. Words such as "connected" or "connected" are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. Words such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; if the absolute position of the described object changes, the relative positional relationship may also change accordingly. Unless otherwise specified, the terms "upwardly", "downwardly", "vertical", "horizontal", etc. used herein are for illustrative purposes only.

[0089] In this document, "front" refers to the side of a child safety seat facing away from the vehicle's seatback when secured to the vehicle's seat; "rear" refers to the side of the child safety seat facing the vehicle's seatback when secured to the vehicle's seat; "left" refers to the side on the left when viewed from the rear to the front of the child safety seat; and "right" refers to the side on the right when viewed from the rear to the front of the child safety seat. Other directional terms such as "front," "rear," "left," and "right" mentioned herein have similar meanings. It should be noted that, unless otherwise specified or limited, directional terms such as "front," "rear," "left," and "right" used herein with respect to various components of a child safety seat are based on the orientations shown in the accompanying drawings. These directional terms will change accordingly if the components of the child safety seat are rotated. In the accompanying drawings, arrows L and R schematically indicate the "left" and "right" directions, and arrows F and B schematically indicate the "front" and "rear" directions. These directional terms are used solely to clarify the description of the embodiments of the present disclosure and are not intended to unduly limit the scope of protection of the present disclosure.

[0090] Figures 1 to 4 schematically illustrate a child safety seat 10 according to one embodiment of the present disclosure. The child safety seat 10 includes a base 200 and a seat assembly 100 disposed on the base 200. The seat assembly 100 is capable of adjusting its angle relative to the base 200. During use, the seat assembly 100, together with the base 200, is placed on a vehicle seat. In other embodiments, the child safety seat 10 may not include the base 200. In this case, the seat assembly 100 can be placed directly on a vehicle seat.

[0091] The seat assembly 100 includes a backrest 1000, a seat 2000, and a headrest 3000. The seat 2000 is disposed on the backrest 1000. The headrest 3000 is movably disposed on the backrest 1000. Specifically, the headrest 3000 is disposed on the backrest 1000 so that the headrest 3000 can be adjusted in height relative to the backrest 1000.

[0092] In this embodiment, the seat 2000 is detachably connected to the backrest 1000. The seat 2000 has a first mode of use, in which it is connected to the backrest 1000 for use together with the backrest 1000, and a second mode of use, in which it is detached from the backrest 1000 for use alone. In the first mode of use, the seat 2000 and the backrest 1000 together define the seating space of the child safety seat 10, and the child is restrained within the seating space by the seat belt 300. The first mode of use is suitable for children in the younger age group (e.g., one to four years old). In this mode, the child safety seat 10 can be a forward-facing or rear-facing child seat. In the second mode of use, the seat 2000 and the backrest of the vehicle seat together define the seating space of the seat 2000, and the child is restrained within the seating space by the vehicle seat belt. The second mode of use is suitable for children in the older age group (e.g., four to twelve years old). In this mode, the seat 2000 can be used forward-facing. The detachable seat 2000 allows the child safety seat 10 to have multiple usage modes, meeting the needs of children of different ages and increasing its usability. Specifically, the seat 2000 can elevate the child to an appropriate height so that the vehicle seat belt can be properly fitted. This type of seat is also known as a "booster seat" or "child booster seat."

[0093] The backrest portion 1000 includes a backrest body 1100 having a front side 1110 and a back side 1120 arranged opposite to each other. The seat portion 2000 is connected to the backrest body 1100, and the upper surface of the seat portion 2000 forms a seating surface 2100 suitable for children to sit on. The front side 1110 of the backrest body and the seating surface 2100 of the seat portion 2000 jointly define a seating space. The longitudinal direction of the backrest body 1100 is approximately perpendicular to the seating surface 2100 of the seat portion 2000. In this embodiment, the seat portion 2000 is arranged to be inclined relative to the base 200, and in particular, the seating surface 2100 of the seat portion 2000 is arranged to be inclined relative to the lower surface of the base 200. The lower surface of the base 200 is approximately parallel to a horizontal plane. Accordingly, the longitudinal direction of the backrest body 1100, which is substantially perpendicular to the seating surface 2100 of the seat portion 2000, is inclined relative to the vertical direction, such that the angle between the longitudinal direction of the backrest body 1100 and the rearward direction F is acute. Furthermore, to clearly illustrate the sliding groove 1200 on the front side 1110 of the backrest body 1100, the seat belt 300 and a portion of the headrest 3000, including the belt insertion opening 3130, are omitted in Figures 1 and 2. The complete structure of the headrest 3000 is illustrated in Figures 8 to 10.

[0094] As shown in Figures 3 and 4, the backrest body 1100 is provided with a sliding groove 1200 and a plurality of shifting ribs 1300 disposed on either side of the sliding groove 1200. The sliding groove 1200 extends longitudinally and through the backrest body 1100. In other words, the sliding groove 1200 extends approximately in the height direction of the backrest body 1100 and extends through both the front 1110 and back sides of the backrest body. The shifting ribs 1300 are disposed on either side of the sliding groove 1200 and extend longitudinally along the backrest body 1100. The shifting ribs 1300 are formed with a plurality of shifting grooves 1400, distributed longitudinally along the backrest body 1100. The sliding grooves 1200 allow the headrest 3000 to slide longitudinally along the backrest body 1100 to adjust its height, while the shifting grooves 1400 lock the headrest 3000 at a specific height. The structure of the headrest portion 3000 will be described in detail later.

[0095] The number of sliding grooves 1200 is two, but not limited to this. In this embodiment, the two sliding grooves 1200 are a first sliding groove 1210 and a second sliding groove 1220. The plurality of shift ribs 1300 include a first shift rib 1310, a second shift rib 1320, and a third shift rib 1330. The first shift rib 1310, the second shift rib 1320, and the third shift rib 1330 are spaced apart, and the third shift rib 1330 is located between the first shift rib 1310 and the second shift rib 1320. Sliding grooves 1200 are formed between the third shift rib 1330 and the first shift rib 1310 and between the third shift rib 1330 and the second shift rib 1320, respectively. In other words, the third shift rib 1330 is located between the two sliding grooves 1200. The first shift rib 1310 is located on a side of one of the two sliding grooves 1200 opposite the third shift rib 1330 (e.g., to the left of the first sliding groove 1210). The second shift rib 1320 is located on a side of the other of the two sliding grooves 1200 opposite the third shift rib 1330 (e.g., to the right of the second sliding groove 1220). In this embodiment, the side surface of each shift rib 1300 partially forms the sidewall of the corresponding sliding groove 1200.

[0096] In some alternative embodiments, the number of the shift ribs 1300 may be one, two, or greater than three, and the number of the sliding grooves 1200 may be one or greater than two, and this application is not limited thereto. Exemplarily, the number of the shift rib 1300 and the number of the sliding groove 1200 are both one, and the shift rib 1300 is located on one side of the sliding groove 1200 (e.g., the left or right side). Exemplarily, the number of the shift ribs 1300 is two, and the number of the sliding groove 1200 is one, and the two shift ribs 1300 are located on the left and right sides of the sliding groove 1200, respectively. Exemplarily, the number of the shift ribs 1300 is greater than three, and the number of the sliding grooves 1200 is two or greater than two, and the sliding groove 1200 is formed between two adjacent shift ribs 1300.

[0097] 5 and 6 , the opening direction of each shift slot 1400 faces away from the headrest body 3100. Specifically, the opening is generally toward the rear and slightly inclined downward. More specifically, each shift slot 1400 has an upper side wall 1410, a lower side wall 1420, and a bottom wall 1430. The bottom wall 1430 is an arc-shaped surface. The lower side wall 1420 is inclined to the bottom wall 1430 and the angle between the lower side wall 1420 and the bottom wall 1430 is an obtuse angle. Specifically, the lower side wall 1420 is a downwardly inclined inclined surface. The upper side wall 1410 is arc-shaped and smoothly transitions to the bottom wall 1430. A limiting protrusion 1411 is provided on the upper side wall 1410 near the opening position of the shift slot 1400. The limiting protrusion 1411 protrudes downward from the upper side wall 1410. It should be noted that “the angle between the lower side wall 1420 and the bottom wall 1430 is an obtuse angle” means that the angle between the cross section at the lowest point of the bottom wall 1430 in the direction perpendicular to the longitudinal direction and the lower side wall 1420 is an obtuse angle.

[0098] Referring to Figures 3 and 4 , each shift groove 1400 is formed simultaneously on multiple shift ribs 1300. In other words, each shift groove 1400 includes multiple shift recesses formed on the multiple shift ribs 1300, with the multiple shift recesses spaced apart from one another. Specifically, the multiple shift recesses include a first shift recess 1400a formed on the first shift rib 1310, a second shift recess 1400b formed on the second shift rib 1320, and a third shift recess 1400c formed on the third shift rib 1330. In other words, each shift groove 1400 includes a first shift recess 1400a, a second shift recess 1400b, and a third shift recess 1400c spaced apart from one another. In this embodiment, the multiple shift recesses are located on the same straight line. In an alternative embodiment, the multiple shift recesses may not be on the same straight line, and this application is not limited thereto.

[0099] Figures 8 to 10 schematically illustrate a headrest portion 3000 according to an embodiment of the present disclosure. The headrest portion 3000 includes a headrest body 3100 and a headrest adjustment mechanism 3200. With reference to Figures 3 and 4 , the headrest adjustment mechanism 3200 is disposed between the headrest body 3100 and the backrest body 1100. It should be noted that "the headrest adjustment mechanism 3200 is disposed between the headrest body 3100 and the backrest body 1100" should be understood as at least a portion of the headrest adjustment mechanism 3200 is located between the headrest body 3100 and the backrest body 1100, and the headrest adjustment mechanism 3200 is respectively connected to the headrest body 3100 and the backrest body 1100. The headrest adjustment mechanism 3200 includes a sliding member 3230, a headrest engaging member 3210, a headrest driving member 3260 and a headrest operating member 3220. The headrest body 3100 is slidably connected to the backrest body 1100 via a sliding member 3230. The headrest engaging member 3210 is movably connected to the sliding member 3230. The headrest operating member 3220 is movably disposed on the headrest body 3100 and is connected to the headrest engaging member 3210 via a headrest driving member 3260. The headrest operating member 3220 can be operated to drive the headrest driving member 3260 to move, thereby driving the headrest engaging member 3210 to move relative to the sliding member 3230 via the headrest driving member 3260, thereby allowing the headrest engaging member 3210 to switch between a headrest locked position and a headrest unlocked position. When the headrest engaging member 3210 is in the headrest locking position (see Figures 3 and 4), the headrest engaging member 3210 is adapted to engage with the backrest body 1100 to restrict relative sliding between the sliding member 3230 and the backrest body 1100, thereby locking the headrest portion 3000 (i.e., the headrest body 3100) at a corresponding height. When the headrest engaging member 3210 is in the headrest unlocking position, the headrest engaging member 3210 is disengaged from the backrest body 1100, allowing the sliding member 3230 to slide relative to the backrest body 1100, thereby allowing the headrest portion 3000 (i.e., the headrest body 3100) to be adjusted in height.

[0100] The headrest engaging member 3210 includes a headrest engaging rod 3211, which extends generally in the left-right direction (i.e., the LR direction) and is generally perpendicular to the longitudinal direction of the backrest body 1100. The headrest engaging rod 3211 has a generally circular cross-section. The headrest engaging rod 3211 is adapted to engage with at least one of the plurality of shift slots 1400 to restrict relative sliding between the slider 3230 and the backrest body 1100. The slider 3230 is fixed to the headrest body 3100 and is provided with a sliding slot 3234. The sliding slot 3234 extends perpendicularly to the direction of extension of the headrest engaging rod 3211 and generally perpendicular to the longitudinal direction of the backrest body 1100. In other words, the sliding slot 3234 extends generally perpendicular to the direction of extension of the sliding slot 1200. The headrest engaging rod 3211 is disposed within the sliding slot 3234 and is capable of sliding along the direction of extension of the sliding slot 3234. At least a portion of the headrest body 3100 and the headrest engaging rod 3211 are located on opposite sides of the backrest body 1100. The headrest engaging rod 3211 at least partially extends from the slider 3230 to engage with one of the plurality of shifting slots 1400. When the headrest engaging member 3210 is in the headrest locking position, the headrest engaging rod 3211 engages with one of the plurality of shifting slots 1400. The headrest engaging rod 3211 is adapted to be stopped by the upper sidewall 1410 of the shifting slot, thereby limiting the longitudinal movement of the headrest engaging rod 3211 along the backrest body 1100, thereby limiting the longitudinal movement of the slider 3230 along the backrest body 1100, and thus locking the headrest portion 3000 at a corresponding height. The upper side wall 1410 is further provided with a limiting protrusion 1411, which is adapted to stop the headrest engaging rod 3211 to prevent it from accidentally disengaging from the opening of the shift slot 1400. When the headrest engaging member 3210 is switched to the headrest unlocking position, the sliding member 3230 disengages from the plurality of shift slots 1400, allowing the headrest engaging member 3210 to move longitudinally along the backrest body 1100, thereby allowing the sliding member 3230 to move longitudinally along the backrest body 1100, thereby allowing the headrest portion 3000 to be adjusted in height.

[0101] 3 and 4 , the portion of the headrest engaging rod 3211 extending from the slider 3230 engages the first, second, and third gear recesses 1400a, 1400b, 1400c of the corresponding gear slots 1400. Referring to FIG6 and 7 , each gear slot 1400 has a downwardly inclined surface, the distal end of which is formed with a stopper protrusion 1421 to prevent the headrest engaging member 3210 from sliding off the surface. Specifically, the lower sidewall 1420 of the third gear recess 1400c forms a stopper protrusion 1421. The stopper protrusion 1421 has a flat surface disposed opposite the upper sidewall 1410. The flat surface of the stopper protrusion 1421 is substantially parallel to a horizontal plane. In other words, the flat surface of the stopper protrusion 1421 is substantially parallel to the front-to-back direction (i.e., the FB direction) and the left-to-right direction (i.e., the LR direction). A portion of the headrest engaging rod 3211 is engaged in the third gear recess 1400 c and placed on the stop protrusion 1421 , thereby preventing the headrest engaging rod 3211 from escaping from the corresponding gear slot 1400 along the lower side wall 1420 of the gear slot 1400 .

[0102] 5 and 6 , at least a portion of the headrest body 3100 is slidably disposed on the front face 1110 of the backrest body 1100, and the sliding member 3230 is slidably disposed on the back face 1120 of the backrest body 1100 and connected to the headrest body 3100 via the sliding groove 1200, so that the headrest body 3100 and the sliding member 3230 can synchronously slide relative to the backrest body 1100, or be synchronously limited at corresponding heights. The headrest body 3100 is provided with a mounting portion 3120. The mounting portion 3120 is provided to protrude rearwardly from the back face 3112 of the headrest body, and at least a portion of the mounting portion 3120 extends into the sliding groove 1200 and can move along the sliding groove 1200. Optionally, the mounting portion 3120 is integrally formed on the headrest body 3100, or is fixed (i.e., non-detachably) disposed on the headrest body 3100 by, for example, bonding, or is detachably disposed on the headrest body 3100 by, for example, bolting, etc., and this application does not impose any restrictions on this. With reference to Figures 8 and 9, the sliding member 3230 is detachably connected to the mounting portion 3120 by bolting, snapping, etc. The side of the headrest body 3100 facing the backrest body 1100 is formed as the back side 3112 of the headrest body, and the side of the headrest body 3100 opposite to its back side is formed as the front side 3111 of the headrest body.

[0103] With reference to FIG7 , the backrest body 1100 is provided with a first engaging portion 1500 extending parallel to the direction in which the sliding groove 1200 extends. The sliding member 3230 is provided with a second engaging portion 3235. One of the first engaging portion 1500 and the second engaging portion 3235 is a groove, and the other is a rib. The first engaging portion 1500 and the second engaging portion 3235 engage in a concave-convex fit, allowing the sliding member 3230 to slide relative to the backrest body 1100 along the direction in which the first engaging portion 1500 extends. In this embodiment, the first engaging portion 1500 is a groove, and the second engaging portion 3235 is a rib. The back surface 1120 of the backrest body is provided with at least one set of first engaging portions 1500, each set of at least two first engaging portions 1500. At least one first engaging portion 1500 is provided on each left and right side of at least one sliding groove 1200. More specifically, the number of groups of first mating portions 1500 corresponds to the number of sliding slots 1200. Each sliding slot 1200 is provided with a first mating portion 1500 on both sides, which means that each group of mating portions has two. In this embodiment, each group of first mating portions 1500 is located between two adjacent shift ribs 1300. Specifically, one of the two groups of first mating portions 1500 is located between the first shift rib 1310 and the third shift rib 1330, and the other of the two groups of first mating portions 1500 is located between the second shift rib 1320 and the third shift rib 1330.

[0104] Accordingly, the number of sliding members 3230 matches the number of sliding grooves 1200. In this embodiment, there are two sliding members 3230, one corresponding to the first sliding groove 1210 and the other corresponding to the second sliding groove 1220. Each sliding member 3230 is provided with two second mating portions 3235. Each second mating portion 3235 engages with a corresponding first mating portion 1500, enabling the sliding member 3230 to slide relative to the backrest body 1100 along the first mating portion 1500, thereby achieving sliding movement of the sliding member 3230 relative to the backrest body 1100.

[0105] For ease of description, the following description will be made by taking the sliding member 3230 located at the second sliding groove 1220 as an example.

[0106] With reference to Figures 3, 8, and 9, the sliding member 3230 is slidably engaged with the sliding groove 1200 provided on the backrest body 1100 and is fixedly connected to the headrest body 3100. The backrest body 1100 is provided with a reinforcing rod 1700 for routing the seat belt. The reinforcing rod 1700 is located above the sliding groove 1200. The sliding member 3230 includes a housing 3231 that at least partially extends within the sliding groove 1200. The headrest body 3100 is provided with a seat belt opening 3130 for routing the seat belt 300 of the child safety seat 10. At least a portion of the housing 3231 is located above the seat belt opening 3130. In other words, the reinforcing rod 1700 and the seat belt opening 3130 are provided on the upper and lower sides of the sliding member 3230, respectively. The seat belt 300, which passes through the seat belt opening 3130, passes around the sliding member 3230, and is then routed around the reinforcing rod 1700. In this embodiment, the seatbelt opening 3130 communicates with the sliding groove 1200, allowing the seatbelt 300 to pass through the opening 3130 and extend toward the backrest body's rear surface 1120. The seatbelt 300 exits the opening 3130 below the slider 3230, passes around the slider 3230, and then wraps around the reinforcing rod 1700 above the slider 3230. Specifically, the seatbelt 300 enters the reinforcing rod 1700 on the side facing the backrest body 1100, then passes upward around the reinforcing rod 1700 and exits on the side facing away from the backrest body 1100. In other words, the seatbelt 300 wraps upward from the inside of the reinforcing rod 1700 to the outside of the reinforcing rod 1700.

[0107] The line connecting the reinforcing rod 1700 and the belt opening 3130 passes through the housing 3231, allowing the seat belt 300 disposed between the reinforcing rod 1700 and the belt opening 3130 to press against the housing 3231. The relative position of the reinforcing rod 1700 and the belt opening 3130 thus changes the direction of the seat belt 300's extension, allowing the seat belt 300 to partially press against the slider 3230, thereby exerting pressure on the slider 3230. This pressure is decomposed into two components: a vertically upward pressure component and a horizontally forward pressure component. The vertically upward pressure component is transmitted to the headrest engaging rod 3211 via the slider 3230, thereby more stably retaining the headrest engaging member 3210 within the shift slot 1400 and preventing the headrest engaging member 3210 from dislodging from the shift slot 1400 due to bumps or other factors, resulting in "shift jumps." It should be noted that "jumping gears" means that the headrest engaging member 3210 accidentally disengages from a relatively higher gear slot 1400 (i.e., the gear slot 1400 relatively far away from the seat 2000) and re-engages in a relatively lower gear slot 1400 (i.e., the gear slot 1400 relatively close to the seat 2000), causing the headrest 3000 to slide from a relatively high position (i.e., a position relatively far away from the seat 2000) to a relatively low position (i.e., a position relatively close to the seat 2000).

[0108] 5 and 6 , the slider 3230 includes a housing 3231 having a rear surface facing away from the backrest body 1100. The rear surface of the housing 3231 is substantially parallel to the back surface 1120 of the backrest body 1100. At least a portion of the reinforcement rod 1700 is located between the extended surface of the housing 3231 and the backrest body 1100, allowing the seat belt 300 to partially press against the slider 3230. Specifically, at least a portion of the reinforcement rod 1700 is located forward of the housing 3231. In other words, the forwardmost point of the reinforcement rod 1700 deviates from the extended surface of the housing 3231 and is located between the extended surface of the housing 3231 and the backrest body 1100. In this way, when the seat belt 300 passes through the sliding member 3230 and is wrapped around the reinforcing rod 1700, the sliding member 3230 and the reinforcing rod 1700 of the seat belt 300 are respectively abutted, causing the extension direction of the seat belt 300 to be offset, so that a portion of the seat belt 300 can be pressed against the sliding member 3230.

[0109] Specifically, the axis of the reinforcing rod 1700 (i.e., the central axis of the reinforcing rod 1700) is located forward of the extension surface S of the rear surface of the housing 3231. More specifically, the extension surface S of the rear surface of the housing 3231 passes through the reinforcing rod 1700. In other words, the projections of the reinforcing rod 1700 and the slider 3230 on a plane perpendicular to the rear surface of the housing 3231 partially overlap. More specifically, a portion of the reinforcing rod 1700 is located forward of the extension surface S of the housing 3231, while another portion of the reinforcing rod 1700 is located rearward of the extension surface S of the housing 3231. In other words, the reinforcing rod 1700 protrudes rearwardly from the housing 3231. This allows the seat belt 300 to be secured against the slider 3230 while allowing the seat belt 300 to pass around the reinforcing rod 1700 and away from the slider 3230 without interfering with the slider 3230.

[0110] With reference to Figure 12 , the lower end of the rear surface of the housing 3231 has a guide surface 3233, which is an inclined surface or a convex cylindrical surface. The slider 3230 has an upper side surface 3232 facing the reinforcement rod 1700. Accordingly, the guide surface 3233 is provided at the transition between the housing 3231 and the upper side surface 3232 (i.e., the upper end of the housing 3231). A portion of the seat belt 300 presses against and slides along the guide surface 3233. The guide surface 3233 reduces friction between the seat belt 300 and the slider 3230, making pulling the seat belt more effortless. Referring to Figures 5 and 6 , the reinforcement rod 1700 includes a rod body 1710 and a rotating sleeve 1720 rotatably mounted on the rod body 1710. The seat belt 300 is adapted to be wound around the rotating sleeve 1720. This allows for more effortless pulling of the seat belt 300.

[0111] As can be seen from the above, a sliding member 3230 capable of moving along the sliding groove 1200 is provided between two adjacent shift ribs 1300. That is, a sliding member 3230 capable of moving along the sliding groove 1200 is provided between the first shift rib 1310 and the third shift rib 1330, and between the second shift rib 1320 and the third shift rib 1330.

[0112] Referring to Figures 4 to 6, in one embodiment, the rear surface of the housing 3231 of each slider 3230 protrudes substantially rearwardly beyond the outer side of its adjacent shift rib 1300. A protrusion 1600 is provided on either side of the sliding slot 1200, with multiple protrusions 1600 located above and / or below the shift slot 1400. The rear surface of each protrusion 1600 protrudes rearwardly beyond the outer side of its adjacent shift rib 1300 and protrudes beyond the rear surface of the housing 3231 of the corresponding slider 3230. Each shift rib 1300 has a first end and a second end located below the first end. In other words, each shift rib 1300 has a second end proximal to the seat 2000 and a first end distal to the seat 2000. Multiple protrusions 1600 are provided on the first and / or second ends of each of the shift ribs 1300. With reference to FIG3 , the plurality of protrusions 1600 include, but are not limited to, first protrusions 1610 disposed at the first ends of the plurality of shift ribs and second protrusions 1620 disposed at the second ends of the plurality of shift ribs. Specifically, the first ends of the first shift rib 1310, the second shift rib 1320, and the third shift rib 1330 are each provided with a first protrusion 1610. The second ends of the first shift rib 1310 and the second shift rib 1320 are each provided with a second protrusion 1620. The second end of the third shift rib 1330 is not provided with a second protrusion 1620. In this way, on the one hand, the protrusion 1600 can be used to limit and stop the headrest locking rod 3211, thereby preventing the headrest locking rod 3211 from escaping from the multiple gear slots 1400; on the other hand, the protrusion 1600 can be used to limit and stop the seat belt 300 that is hung down after passing around the reinforcing rod 1700, thereby confining the seat belt 300 between its two adjacent gear ribs 1300, thereby avoiding interference between the seat belt 300 and the gear ribs 1300.

[0113] 10 and 11 , the headrest operating member 3220 is movably mounted on the headrest body 3100. In this embodiment, the headrest operating member 3220 is movably mounted on the headrest body 3100 via a fixing base 3300. The longitudinal direction of the headrest body 3100 is substantially parallel to the longitudinal direction of the backrest body 1100, and the movement direction of the headrest operating member 3220 is substantially perpendicular to the movement direction of the headrest engaging rod 3211.

[0114] The headrest operating member 3220 includes an operating portion 3221, a connecting arm 3222, and an operating connection portion 3223. The operating portion 3221 is connected to the connecting arm 3222 via the operating connection portion 3223. The connecting arm 3222 is connected to the headrest driving member 3260. In other words, the operating portion 3221, the operating connection portion 3223, the connecting arm 3222, and the headrest driving member 3260 are connected in sequence. The number of headrest driving members 3260 corresponds to the number of sliding members 3230. In this embodiment, the headrest operating member 3220 includes two headrest driving members 3260, two connecting arms 3222, an operating connection portion 3223, and an operating portion 3221. The two headrest driving members 3260 are drivingly connected to the headrest engaging member 3210 and connected to the operating connection portion 3223 via the two connecting arms 3222. The operating portion 3221 drives the two headrest driving members 3260 to move via the two connecting arms 3222. The headrest operating member 3220 moves roughly along the longitudinal direction of the headrest body 3100 , which is equivalent to the operating portion 3221 moving along the longitudinal direction of the headrest body 3100 and driving the two headrest driving members 3260 to move along the longitudinal direction through the operating connecting portion 3223 and the two connecting arms 3222 .

[0115] With reference to Figures 10 and 11 , the operating portion 3221 is movably disposed on the front face 3111 of the headrest body 3100. The operating connection portion 3223 is limited on the headrest body 3100 by the fixing seat 3300 and can move relative to the headrest body 3100 together with the operating portion 3221, thereby slidably limiting the headrest operating member 3220 on the headrest body 3100. The operating connection portion 3223 is roughly plate-shaped. The operating connection portion 3223 is arranged parallel to the front face of the headrest body 3100. The fixing seat 3300 is fixed to the headrest body 3100 by, for example, threaded connection, snap connection, etc., but is not limited thereto. The fixing seat 3300 is provided with a limiting portion 3310, which is detachably connected to the front face 3111 of the headrest body. Specifically, the limiting portion 3310 includes a limiting wall portion 3311, two connecting ears 3312 disposed on the limiting wall portion 3311, and a limiting pin 3313 connected to the limiting wall portion 3311. The limiting wall portion 3311 is detachably connected to the headrest body 3100 via the two connecting ears 3312. The limiting pin 3313 extends generally downward and is configured to detachably connect to the headrest body 3100. In this embodiment, the operational connection portion 3223 is disposed between the limiting wall portion 3311 and the headrest body 3100 and is connected to the headrest body 3100 via the limiting pin 3313, thereby being positioned between the limiting wall portion 3311 and the headrest body 3100. Specifically, the headrest body 3100 is provided with an adapter portion 3150. The operational connection portion 3223 has a connection opening 3227, through which the adapter portion 3150 is exposed to connect with the limiting pin 3313. The limiting pin 3313 is engaged with the adapting portion 3150 through the connecting opening 3227 .

[0116] The fixed seat 3300 is also provided with a seat body 3320, which is connected to the limiting wall portion 3311 and forms a limiting space 3330. The limiting portion 3310 can be integrally formed with the seat body 3320, or fixedly (i.e., non-detachably) connected to the seat body 3320, or detachably connected to the seat body 3320, and this application does not impose any restrictions on this. The operating portion 3221 is located between the seat body 3320 and the limiting wall portion 3311. The operating portion 3221 protrudes backward from the operating connection portion 3223, which not only facilitates operation of the operating portion 3221, but also allows the limiting wall portion 3311 to block the operating portion 3221 to prevent the operating portion 3221 from crossing the limiting wall portion 3311, thereby limiting the operating portion 3221 within the limiting space 3330.

[0117] 9 and 10 , the connecting arm 3222 extends longitudinally along the headrest body 3100. The headrest body 3100 is provided with a through-channel 3140. The connecting arm 3222 is disposed within the through-channel 3140, allowing at least a portion of the headrest driver 3260 to extend out of the through-channel 3140, thereby enabling the headrest driver 3260 to be driven and connected to the headrest engaging rod 3211 located on the back surface 3112 of the headrest body. The through-channel 3140 extends through the mounting portion 3120.

[0118] 5 and 6 , the headrest driver 3260 is drivingly connected to the headrest engaging rod 3211, thereby driving the headrest engaging rod 3211 to move in the front-to-back direction. Specifically, each headrest driver 3260 is provided with a drive slot 3261. The angle between the drive slot 3261 and the direction of movement of the headrest operating member 3220 is acute, and the angle between the drive slot 3261 and the sliding slot 3234 is also acute. The headrest engaging rod 3211 is disposed within the sliding slot 3234 and the drive slot 3261. In this embodiment, the headrest engaging rod 3211 is blocked by the walls of the drive groove 3261 and the sliding groove 3234, thereby moving the headrest engaging rod 3211 along the drive groove 3261 and the sliding groove 3234, thereby driving the headrest engaging rod 3211 to move in the front-to-back direction between a headrest locking position and a headrest releasing position, thereby locking or unlocking the headrest body 3100 and adjusting the height of the headrest body 3100. At least a portion of the headrest driving member 3260 extends into the sliding member 3230 and is provided with a drive groove 3261. The drive groove 3261 is directly opposite the sliding groove 3234 provided on the sliding member 3230. As shown in Figures 8 and 9, the headrest engaging rod 3211 passes through the sliding groove 3234 and the drive groove 3261 and extends outside the sliding member 3230.

[0119] With reference to Figures 5, 6, and 12, the sliding member 3230 is provided with a first receiving groove 3236 and a second receiving groove 3238, which are interconnected. The first receiving groove 3236 is connected to the sliding groove 3234. The opening of the first receiving groove 3236 faces the mounting portion 3120 and is directly opposite the through-hole 3140 (see Figure 9). In other words, the projection of the first receiving groove 3236 on the headrest body 3100 at least partially overlaps with the through-hole 3140. At least a portion of the headrest driver 3260 is accommodated within the first receiving groove 3236. This facilitates the insertion of the headrest driver 3260 into the first receiving groove 3236. One end of the first receiving groove 3236 is open, while the other end of the first receiving groove 3236 forms a stopper 3237. Specifically, the end of the first receiving groove 3236 adjacent to the second receiving groove 3238 forms a stopper 3237. The first receiving groove 3236 extends longitudinally, that is, the extending direction of the first receiving groove 3236 is substantially parallel to the longitudinal direction of the backrest body 1100. At least a portion of the headrest driver 3260 is slidably disposed within the first receiving groove 3236 and is adapted to be stopped by the limiting end 3237 to limit the movement of the headrest driver 3260 relative to the sliding member 3230. In other words, the movement of the headrest operating member 3220 relative to the headrest body 3100 is limited.

[0120] As shown in Figures 5 and 6, in one embodiment, the headrest adjustment mechanism 3200 further includes a first reset member 3240, which is disposed between the sliding member 3230 and the headrest driver 3260. The first reset member 3240 is adapted to bias the headrest driver 3260 to drive the headrest engaging rod 3211 toward the headrest locking position. Thus, when the headrest operating member 3220 is not operated, the elastic restoring force of the first reset member 3240 causes the headrest operating member 3220 to move back to its original position, thereby driving the headrest engaging rod 3211 toward the headrest locking position. Specifically, at least a portion of the headrest driver 3260 is accommodated within the first accommodating groove 3236 and is provided with a flat abutment surface 3225. The first reset member 3240 is, for example, a compression spring. One end of the first restoring member 3240 is received in the second retaining groove 3238 and abuts against the end of the second retaining groove 3238. The other end of the first restoring member 3240 extends into the first retaining groove 3236 and abuts against the abutting surface 3225. More specifically, a first boss 3239 is provided at the end of the second retaining groove 3238, and the first boss 3239 is disposed opposite the abutting surface 3225. One end of the first restoring member 3240 is sleeved onto the first boss 3239 and abuts against the end of the second retaining groove 3238. The other end of the first restoring member 3240 abuts against the abutting surface 3225. Sleeving the first restoring member 3240 onto the first boss 3239 prevents the first restoring member 3240 from shifting.

[0121] In this embodiment, there is one first restoring member 3240 . The first restoring member 3240 is disposed within the sliding member 3230 that is disposed opposite the second sliding groove 1220 . In other embodiments, the number of first restoring members may be two or more, and each sliding member 3230 is provided with a first restoring member 3240 .

[0122] As shown in Figure 11, in one embodiment, the headrest adjustment mechanism 3200 further includes a second reset member 3250, which is disposed between the fixed seat 3300 and the operating portion 3221. The second reset member 3250 is adapted to bias the operating portion 3221 to reset the headrest operating member 3220, and to drive the headrest engaging member 3210 to switch to the headrest locked position via the headrest driving member 3260 of the headrest operating member 3220. The second reset member 3250 is disposed between the seat body 3320 and the operating portion 3221. The second reset member 3250 is, for example, a compression spring. The seat body 3320 is provided with a receiving slot 3321. The opening of the receiving slot 3321 faces toward the seat 2000, that is, the opening of the receiving slot 3321 is generally downward. When the headrest operating member 3220 is operated, the operating portion 3221 moves into the receiving slot 3321. Specifically, the second restoring member 3250 is at least partially accommodated in the accommodating groove 3321, with one end of the second restoring member 3250 abutting against the bottom wall of the accommodating groove 3321, and the other end of the second restoring member 3250 abutting against the operating portion 3221. More specifically, the bottom wall of the accommodating groove 3321 is provided with a second boss 3340, and the operating portion 3221 is provided with an accommodating recess 3226. One end of the second restoring member 3250 is sleeved on the second boss 3340 and abuts against the bottom wall of the accommodating groove 3321, while the other end of the second restoring member 3250 is accommodated in the accommodating recess 3226 and abuts against the bottom wall of the accommodating groove 3326.

[0123] The operating principles of the child safety seat 10 and the headrest 3000 thereof provided according to the embodiment of the present disclosure are as follows.

[0124] To adjust the height of the headrest 3000, the operating portion 3221 of the headrest operating member 3220 is pulled upward. The operating portion 3221, via the operating connection portion 3223 and the two connecting arms 3222, drives the headrest driver 3260 to slide upward. The two headrest drivers 3260, through the drive slots 3261 provided therein and the headrest engaging rods 3211, respectively, drive the headrest engaging rods 3211 backward along the sliding slots 3234, causing the headrest engaging rods 3211 to exit the corresponding shift slots 1400 (i.e., the headrest engaging rods 3211 move to the headrest release position). At this point, the headrest body 3100 can be moved axially relative to the backrest body 1100, driving the sliding member and the headrest engaging rods 3211 to move together. When the headrest body 3100 reaches the desired height, the headrest engaging rods 3211 face one of the multiple shift slots 1400. At this time, the headrest operating member 3220 is released, and the headrest driving member 3260 moves and resets under the elastic restoring force of the first restoring member 3240. The driving cooperation between the driving slot 3261 and the headrest engaging rod 3211 drives the headrest engaging rod 3211 to move forward and engage with the opposite gear slot 1400. At the same time, the operating portion 3221 further moves and resets under the elastic restoring force of the second restoring member 3250.

[0125] The headrest portion 3000 provided in accordance with the embodiment of the present disclosure and the child safety seat 10 having the headrest portion 3000 have at least the following beneficial effects: the headrest engaging member 3210 is driven by the headrest operating member 3220 to switch between the headrest locking position and the headrest unlocking position, so that the headrest engaging member 3210 provided on the headrest sliding member 3230 selectively engages with the backrest body 1100, thereby selectively limiting or allowing relative movement between the headrest sliding member 3230 and the backrest body 1100, thereby achieving synchronous limitation or allowing relative movement between the headrest body 3100 and the backrest body 1100. In this way, the height adjustment of the headrest portion 3000 (i.e., the headrest body 3100) is achieved. The headrest portion 3000 provided in the embodiment of the present disclosure has a simple structure and is easy to operate.

[0126] Figures 13, 27 and 35 schematically illustrate a child safety seat 10 according to another embodiment of the present disclosure. The child safety seat 10 can be fixed to the vehicle seat by, for example, configuring an ISOFIX connector, an upper pull belt and other structures, and can also be fixed to the vehicle seat by a vehicle seat belt configured for the vehicle. The child safety seat 10 may include a backrest portion 4000 and a booster cushion 5000 provided according to some embodiments of the present disclosure. The booster cushion 5000 may correspond to the seat portion 2000 described in the above embodiment, that is, the seat portion 2000 in the above embodiment may be replaced by the booster cushion 5000. The booster cushion 5000 will be explained together with the description of the child safety seat 10 below.

[0127] As shown in Figures 13, 14, and 28, in some embodiments, the booster cushion 5000 is detachably connected to the backrest 4000. The booster cushion 5000 has a first use mode, in which it is connected to the backrest 4000 for use together with the backrest 4000, and a second use mode, in which it is detached from the backrest 4000 for standalone use. In the first use mode, the booster cushion 5000 and the backrest 4000 together define the seating space of the child safety seat 10, and the child is restrained within the seating space by a seat belt (e.g., the seat belt 300 described in the above embodiment). The first use mode is suitable for children in the younger age group (e.g., one to four years old). In this use mode, the child safety seat 10 can be a forward-facing or rear-facing child seat. In the second use mode, the booster cushion 5000 and the backrest of the vehicle seat together define the seating space of the booster cushion 5000, and the child is restrained within the seating space by the vehicle seat belt. The second usage mode is suitable for children in an older age group (e.g., 4 to 12 years old). In this mode, the booster cushion 5000 can be used forward-facing. The detachable booster cushion 5000 allows the child safety seat 10 to have multiple usage modes to meet the needs of children of different ages, thereby increasing the utilization rate of the child safety seat 10.

[0128] 14, 16, and 22, the booster cushion 5000 includes a cushion body 5100, which includes a first shell 5111 and a second shell 5112. The first shell 5111 and the second shell 5112 engage to form a seat cavity 5113 of the booster cushion 5000. The cushion body 5100 includes a mating rib 5180, which can be provided at the rear end of the booster cushion 5000 to engage with the backrest body 4100 of the backrest portion 4000, thereby securing the booster cushion 5000 in a suitable position.

[0129] 21, 25, and 31, the booster cushion 5000 further includes a connecting mechanism 5200 and a retaining mechanism 5300 housed within the cushion cavity 5113. The connecting mechanism 5200 is used to detachably assemble the booster cushion 5000 into the child safety seat 10, and the retaining mechanism 5300 allows the booster cushion 5000, after being disassembled, to be switched to a locked and released state for subsequent use.

[0130] 15 and 20 , the backrest 4000 includes a backrest body 4100, which includes backrest limiting ribs 4120, a latch receiving portion 4130, and a retaining member driving portion 4140, all located on either side of the backrest body 4100. The backrest limiting ribs 4120 are located near the rear end of the backrest body 4100 and are configured to engage with the mating ribs 5180 of the booster cushion 5000. The latch receiving portion 4130 is adapted to receive the latching member 5210 of the connecting mechanism 5200. In this embodiment, the latch receiving portion 4130 is a backrest latching hole 4131. The backrest limiting ribs 4120, latch receiving portion 4130, and retaining member driving portion 4140 may also be located elsewhere on the backrest body 4100. For example, the latch receiving portion 4130 may be located at the front end of the backrest body, or the retaining member driving portion 4140 may be located on the upper surface of the backrest body.

[0131] 15 , 17 , and 18 , the retainer driving portion 4140 may protrude from the backrest body 4100. Specifically, the retainer driving portion 4140 may include a driving protrusion 4141 that gradually increases in height relative to the backrest body 4100 along the direction of removal of the booster cushion 5000, thereby facilitating removal of the booster cushion 5000 from or assembly of the booster cushion into the child safety seat 10. The retainer driving portion 4140 may also include a recess 4142 recessed inwardly relative to the backrest body 4100. The driving protrusion 4141 is positioned within the recess 4142 and, when the booster cushion is assembled into the child safety seat 10, abuts against the retaining mechanism 5300, thereby driving movement of the retaining mechanism 5300 relative to the seat cushion body 5100.

[0132] 21, 22, and 23, the retaining mechanism 5300 includes a retaining member 5310 connected to the seat cushion body 5100 and a third resetting member 5320 disposed between the retaining member 5310 and the seat cushion body 5100. The retaining member 5310 includes a driving portion 5311 and a transmission portion 5312 connected to the driving portion 5311. The driving portion 5311 and the transmission portion 5312 can be integrally formed or separately formed and connected together. The transmission portion 5312 is used to engage the connecting mechanism 5200, and the driving portion 5311 is used to drive the retaining member 5310 toward the unlocked position. The first elastic member 5321 is configured to bias the retaining mechanism 5300 toward the locked position. The third resetting member 5320 can be fixed to the seat cushion body 5100 or fixedly connected to the retaining member 5310. Alternatively, the third restoring member 5320 may be an elastic piece formed at one end of the retaining member 5310 , and the elastic piece may be detachably pressed against the seat cushion body 5100 .

[0133] The connecting mechanism 5200 is arranged on the seat cushion body 5100 and includes a clamping member 5210 and a first operating member 5220 connected to the clamping member 5210 and movably connected to the seat cushion body 5100. The clamping member 5210 includes a clamping connection portion 5211 connected to the first operating member 5220 and a clamping pin 5212. The clamping pin 5212 can be integrally formed with the clamping connection portion 5211 or can be made separately. The clamping pin 5212 passes through the seat cushion clamping hole 5160 of the seat cushion body 5100 and is engaged with the backrest clamping hole 4131 (refer to Figure 15) of the backrest portion 4000. In the present embodiment, the clamping member 5210 is in the form of a pin. In fact, the clamping member 5210 can also be in other shapes. At this time, the clamping member receiving portion 4130 is a shape that matches the clamping member 5210.

[0134] 15 , 25 , and 26 , the first operating member 5220 may include an operating connection portion 5221 and an operating block 5222. The operating connection portion 5221 and the operating block 5222 may be integrally formed or separately formed. The operating block 5222 may be engaged with the retaining member 5310. The operating connection portion 5221 is connected to the engaging connection portion 5211, for example, by rotation or sliding. In this embodiment, the operating connection portion 5221 includes a drive groove 5221a, which extends a distance in a direction that is angled with the direction of motion of the engaging pin 5212 relative to the back-retaining engaging hole 4131. The length of the drive groove 5221a in the direction of motion of the engaging pin 5212 relative to the back-retaining engaging hole 4131 is greater than or equal to the distance the engaging pin retracts from the back-retaining engaging hole. In another embodiment, for example, the operating connection portion 5221 can be a gear and chain combination (not shown), and the chain is connected to the locking connection portion 5211. The gear is rotated by controlling the handle, so that the locking connection portion 5211 drives the locking pin 5212 to follow the movement of the chain engaged on the gear and pass through the seat cushion locking hole 5160 of the seat cushion body 5100 and insert into the backrest locking hole 4131 on the backrest 2, thereby switching the locking member 5210 between the locking position and the releasing position.

[0135] Referring to Figures 25, 26, and 32, the connecting mechanism 5200 may further include a fourth reset member 5230 that biases the engaging member 5210 toward the engaged and locked position. As shown, the fourth reset member 5230 includes a second elastic member 5231 connected to the seat cushion body 5100. The second elastic member 5231 may be a spring or a spring, and is at least partially located within the operating block space 5222e of the operating block 5222. The operating block space 5222e may be a space formed by a plate that sandwiches the motion plane of the engaging pin 5212, thereby limiting the spring's swing in the non-compression direction. One end of the second elastic member 5231 abuts the second housing 5112, while the other end is fixed to the engaging pin 5212. In Figure 32, the engaging connection portion 5211 may be a rod integrally formed with the engaging pin 5212. The rod can slide within the drive slot 5221a, thereby switching the engaging member 5210 between the engaged and locked position and the engaged and unlocked position. In another embodiment, the connecting mechanism 5200 may not include the fourth restoring member 5230 .

[0136] Referring to Figures 20, 23, and 25, the driving portion 5311 of the retaining member 5310 is pivotally connected to the seat cushion body 5100 via a first pivot 7100. A guide groove 5150 recessed into the interior of the seat cushion body 5100 is formed in the first housing 5111. An opening 5151 is formed in the guide groove 5150. The driving portion 5311 includes a rotating protrusion 5311a pivotally connected to the first pivot 7100. The driving protrusion 4141 protrudes from the side of the backrest body 4100 and can be received in the guide groove 5150, pushing against the rotating protrusion 5311a. This prevents the booster cushion 5000 from sliding out of the backrest body 4100 due to an impact (e.g., sudden braking during vehicle operation) if the engaging member 5210 malfunctions (e.g., breaks). The driving portion 5311 may be a grid-like rib with an upwardly angled shape, thereby increasing friction between the backrest body 4100 and the seat cushion body 5100 and preventing the booster cushion 5000 from sliding horizontally from the backrest body 4100 under impact. The transmission portion 5312 may be connected to or integrally formed with the rotating protrusion 5311a. When the booster cushion 5000 is removed from the child safety seat 10 and the retaining mechanism 5300 is in the retaining locked position, the rotating protrusion 5311a protrudes from the opening 5151 toward the outside of the seat cushion cavity. When the booster cushion 5000 is installed in the child safety seat 10, the retaining mechanism 5300 is in the retaining released position, and the rotating protrusion 5311a is received within the seat cushion cavity 5113. The rotating protrusion 5311a may have an inclined surface that slopes toward the entrance of the guide groove 5150. When the booster cushion 5000 is mounted on the backrest body 4100 , the driving protrusion 4141 presses the inclined surface, thereby driving the retaining mechanism 5300 to pivot toward the retaining release position, thereby releasing the engagement with the operating block 5222 .

[0137] The transmission portion 5312 may include a crossbar 5312a, and the third reset member 5320 may include a first elastic member 5321. As shown, the first elastic member 5321 may be a compression spring, a tension spring, or a spring. One end of the first elastic member 5321 is fixed to the first housing 5111 of the seat cushion body 5100 and is disposed between the crossbar 5312a and the seat cushion body 5100. As the driving portion 5311 moves relative to the seat cushion body 5100, the crossbar 5312a can switch between pressing against and pushing away from the first elastic member 5321.

[0138] 25 , the engaging end 5312b engages with the blocking rib 5222a formed on the operating block 5222. The shape of the engaging end 5312b can be changed according to actual conditions as long as it can engage with the operating member 322.

[0139] As shown in Figures 19, 20, and 23, the seat cushion body 5100 may further include a first limiting rib 5130. The first limiting rib 5130 is disposed at least partially around the first elastic member 5321 in a direction perpendicular to the movement direction of the first elastic member 5321, and the height of the first limiting rib 5130 in the compression direction of the first elastic member 5321 is no greater than the maximum compression length of the first elastic member 5321.

[0140] Referring to Figures 23, 24, and 25, the operating block 5222 is formed with a first limiting hole 5222b extending a predetermined length along the direction of movement of the first operating member 5220. A limiting post 5240 passes through the first limiting hole 5222b and is secured within the seat cushion body 5100, thereby limiting the direction of movement of the operating block 5222. Furthermore, the positioning of the second elastic member 5231 and the limiting post 5240 on the seat cushion body 5100 substantially defines the vertical positioning of the first operating member 5220. The operating block 5222 may also be formed with an operating recess 5222c. The seat cushion body 5100 includes a snap-fit ​​opening 5190 that exposes the seat cushion cavity 5113. The operating recess 5222c is recessed from the exterior of the seat cushion body 5100 toward the seat cushion cavity 5113, with at least a portion of the operating recess 5222c exposed outwardly from the snap-fit ​​opening 5190.

[0141] The seat cushion main body 5100 includes a second limiting rib 5140, which protrudes relative to the seat cushion main body 5100 along the movement direction of the first operating member 5220, so that during operation, the first operating member 5220 will be supported by the second limiting rib 5140 and will not be directly pressed on the seat cushion main body 5100, or cause the first operating member 5220 to rotate and lose its function.

[0142] The operating block 5222 may be formed with a limiting protrusion 5222d, which protrudes from the side of the operating recess 5222c opposite the outwardly exposed side of the operating recess 5222c. The second limiting rib 5140 is formed with a locking recess 5141 at the front end in the direction of movement of the first operating member 5220, which matches the shape of the limiting protrusion 5222d. The limiting protrusion 5222d engages and disengages with the locking recess 5141 as the engaging member 5210 switches between the locked and released positions.

[0143] 15 , 25 and 26 , when preparing to remove the booster cushion 5000 from the backrest portion 4000 , place your hand on the operating recess 5222 c and apply force upward to lift the first operating member 5220 upward along the drive groove 5221 a relative to the engaging member 5210 . As a result, the force applied to the engaging member 5210 causes the engaging member 5210 to retract from the backrest engaging hole 4131 and be biased against the second elastic member 5231 , thereby returning the engaging member 5210 to the engaged and unlocked state. As the booster seat cushion 5000 is gradually disassembled from the backrest portion 4000, the driving protrusion 4141 moves away from the driving protrusion 4141, and the force applied to the cross bar 5312a decreases until it disappears. The first elastic member 5321 pushes away from the cross bar 5312a through its restoring force, and the engaging end 5312b integrally formed with or fixedly connected to the cross bar 5312a moves toward the first operating member 5220 under the action of the thrust and engages in the blocking rib 5222a of the first operating member 5220, thereby keeping the first operating member 5220 in the released position, that is, keeping the engaging member 5210 in the engaged and released position. When the booster cushion 5000 is installed in the backrest 4000, the engaging rib 5180 abuts against the backrest limiting rib 4120, and the driving protrusion 4141 in the retainer driving unit 4140 pushes against the retainer driving unit 4140, causing the driving unit 5311 to rotate relative to the seat cushion body 5100 about the first pivot 7100. As the driving unit 5311 rotates, the transmission unit 5312 connected to the driving unit 5311 rotates, causing the crossbar 5312a to rotate and be biased against the first elastic member 5321, releasing the engagement end 5312b from the blocking rib 5222a. At this point, the restoring force of the spring 3231 pushes the engaging pin 5212 from the seat cushion engaging hole 5160 into the backrest engaging hole 4131, allowing the engaging member 5210 to switch to the engaged and locked position.

[0144] In this embodiment, the retaining mechanism 5300 changes the engagement state between the retaining mechanism 5300 and the connecting mechanism 5200 through the restoring force of the first elastic member 5321. In practice, the switching of the engagement state between the retaining mechanism 5300 and the connecting mechanism 5200 can also be achieved through other forces. For example, a weight block that can slide along a slideway on the seat cushion body 5100 can be provided on the driving portion 5311. The weight block can be rotatably connected to the transmission portion 5312. When the booster cushion 5000 and the backrest 4000 are assembled together, the weight block is blocked by the backrest body 4100 and slides upward, causing the transmission portion 5312 connected to the weight block to deflect, thereby disengaging the retaining member 5310 from the operating member 322. When the booster cushion 5000 is disassembled from the backrest 4000, the gravity block separates from the backrest body 4100 and slides down the slideway under the action of gravity, causing the transmission part 5312 connected to the gravity block to deflect. At this time, the retaining member 5310 and the operating member 322 are engaged again.

[0145] Furthermore, in this embodiment, the retaining mechanism 5300 rotates relative to the seat cushion body 5100 by rotating about the first pivot 7100. In essence, the retaining mechanism 5300 can slide relative to the seat cushion body 5100. Furthermore, in this embodiment, the state of the retaining mechanism 5300 is changed by the movement of a spring relative to the seat cushion body 5100 in its longitudinal direction. In essence, the state of the retaining mechanism 5300 can also be changed by utilizing the biasing force of the spring. For example, identical horizontal grooves can be provided on both sides of the seat cushion body 5100 where the first elastic member 5321 is provided. The transmission portion 5312 is positioned between the first operating member 5220 and the first elastic member 5321, with one end of the first elastic member 5321 being provided on the seat cushion body 5100. Both the driving portion 5311 and the transmission portion 5312 of the retaining member 5310 can slide synchronously within the grooves. The transmission portion 5312 can include an inclined surface, and a blocking portion can be provided on the backrest body 4100 to block the driving portion 5311. When the booster cushion 5000 and the backrest 4000 are assembled horizontally, the driving portion 5311 slides against the blocking portion of the backrest body 4100, causing the transmission portion 5312, which is coupled to the driving portion 5311, to move toward the first elastic member 5321 and press its inclined surface against the first elastic member 5321, thereby disengaging the retaining member 5310 from the first operating member 5220. When disassembling, the driving portion 5311 separates from the blocking portion of the backrest body 4100, and the restoring force of the first elastic member 5321 pushes the transmission portion 5312 toward the first operating member 5220, causing it to engage with the first operating member 5220.

[0146] Referring to Figures 16, 33, and 35, the seat cushion body 5100 may further include armrests 5170. The armrests 5170 are disposed on both sides of the seat cushion body 5100 and extend upward from the upper surface 5121 of the seat cushion body 5100 at a certain angle to the upper surface 5121. The armrests 5170 form first holes 5171 for passing a vehicle seat belt through. The armrests 5170 may further include a storage recess 5172 formed by a portion of the seat cushion body 5100 outside the seat cushion cavity 5113 and having a storage space. The storage recess 5172 includes a storage connection hole 5172a recessed from the storage recess 5172 toward the upper surface 5121 of the seat cushion body 5100, and a connection groove 5172b on the side of the storage recess 5172.

[0147] As shown in Figures 33, 34, and 35, the booster cushion 5000 also includes at least one storage cup 5400. The storage cup 5400 includes a connecting post 5410 protruding from the bottom of the storage cup 5400 and a cup connecting protrusion 5420 protruding from the side of the storage cup 5400. The connecting post 5410 is inserted into the storage connection hole 5172a, and the cup connecting protrusion 5420 engages with the connecting groove 5172b.

[0148] Referring to Figures 17, 26, and 28, the child safety seat 10 may further include a base 200, a headrest 3000, and an angle adjustment mechanism 6000. In this embodiment, the child safety seat 10 includes the angle adjustment mechanism 6000, which allows adjustment of the angle of the backrest 4000 relative to the base 200. In other embodiments, the backrest 4000 may not include the angle adjustment mechanism 6000, and / or the child safety seat 10 may not include the base 200, without limitation in this application. Furthermore, a booster cushion 5000 may be assembled directly with the base 200 for use by older children. In this case, the base 200 can be provided with a base engaging portion (not shown) to engage with the engaging member 5210 of the booster cushion 5000, and a base driving portion to drive the driving portion 5311 of the booster cushion 5000 to move relative to the cushion body 5100. The configuration of the base engaging portion and the base driving portion is the same as that of the engaging member receiving portion 4130 and the retaining member driving portion 4140 of the backrest body 4100, and therefore will not be repeated.

[0149] Referring to Figures 29, 30, and 32, the base 200 may include a base body 210, a coupling portion 230, and a pivoting portion 240. The base 200 may be integrally formed. Alternatively, it may be formed by the engagement of a base upper shell 201 and a base lower shell 202. The lower surface 1b may be flat to facilitate mounting the booster cushion 5000 or child safety seat 10 on a vehicle seat. The pivoting portion 240 and coupling portion 230 extend upward at a predetermined angle relative to the base upper surface 211 of the base body 210. The coupling portion 230 engages with the angle adjustment mechanism 6000. The pivoting portion 240 is rotatably connected to the backrest body 4100 of the backrest portion 4000 via a second pivot 7200. In the embodiment shown in Figure 30, the pivoting portion 240 is triangular in shape. The pivoting portion 240 is pivotally connected to the backrest body 4100 at approximately the vertex of the triangle. In other embodiments, the pivoting portion 240 may also be any other shape suitable for pivoting with the backrest body 4100 .

[0150] 28 , 29 and 38 , the angle adjustment mechanism 6000 can be movably connected to the base 200 and can be movably connected to the backrest body 4100 , thereby adjusting the angle of the backrest body 4100 relative to the base 200 to meet the user's comfort requirements and increase the utilization rate of the child safety seat.

[0151] Specifically, the angle adjustment mechanism 6000 includes a fifth reset member 6100 and a second operating member 6200. The fifth reset member 6100 may include a third elastic member 6110, which may be a spring. One end of the third elastic member 6110 abuts against the bottom of the backrest body 4100 and is movable relative to the backrest body 4100, and the other end abuts against the second operating member 6200.

[0152] The second operating member 6200 includes a rotating portion 6210 and a sliding portion 6220. The rotating portion 6210 is generally funnel-shaped, at least partially accommodating the third elastic member 6110 and rotatably connected to the backrest body 4100 via a third pivot 7300. The sliding portion 6220 can be integrally formed with the rotating portion 6210 or connected to the rotating portion 6210. One end of the sliding portion 6220 is capable of sliding relative to the base 200.

[0153] 30 and 38 , the base 200 includes a shift portion 220 protruding from the base upper surface 211 of the base body 210. The top center of the shift portion 220 is recessed to form an arc-shaped recessed platform 223, with engagement portions 230 formed on either side of the recessed platform 223. At least one, for example, two, three, or more, angular shift grooves 221 are provided on either side of the shift portion 220, along the height direction of the shift portion 220 relative to the base 200. The angular shift grooves 221 are formed at an angle slanting upward from the shift portion 220.

[0154] The sliding portion 6220 is generally inverted U-shaped and includes two separate legs 6221 that mate with the shift portion 220. The shift pin 7400 passes through the two legs 5321 and engages with the angular shift slot 221. When force is applied to the second operating member 6200, the second operating member 6200 rotates relative to the backrest body 4100, thereby disengaging the shift pin 7400 from the angular shift slot 221 and engaging with another angular shift slot 221. The shift portion 220 also includes angular shift ribs 222 formed on both sides of the shift portion 220 and extending in the height direction of the protrusion relative to the base 200. The angular shift ribs 222 at least partially surround the angular shift slot 221 along the direction of movement of the shift pin 7400, thereby retaining the shift pin 7400 in the angular shift slot 221. 15 , 22 , and 32 , the backrest portion 4000 includes a reinforcement tube 4300. The reinforcement tube 4300 is fixedly mounted within the backrest body 4100 and extends from the upper backrest portion 4111 (the portion for the child's back to rest against) to the lower backrest portion 4112 (the portion for accommodating the buttocks) of the backrest body 4100. The reinforcement tube 4300 includes a first reinforcement hole 4310 opposite the backrest engagement hole 4131. The engagement member 5210 can be inserted through the backrest engagement hole 4131 into the first reinforcement hole 4310. The reinforcement tube 4300 also includes a second reinforcement hole 4320 opposite the second pivot 7200. The second pivot 7200 is inserted through the connection hole 4150 of the backrest body 4100 into the second reinforcement hole 4320.

[0155] 35, 36, and 37, the backrest body 4100 of the backrest portion 4000 includes a storage recess 4160 above the upper surface 5121 of the seat cushion body 5100. The storage recess 4160 is suitable for storing items. The storage recess 4160 is formed by the backrest body 4100 being recessed toward the side opposite to the side surrounded by the backrest portion 4000 and the booster cushion 5000 (the side where the passenger space is located). The backrest portion includes a cover 4200, which is rotatably inserted into the storage connection slot 4162 of the storage recess 4160 via a cover connection rod 4240 to close the storage recess 4160. The cover 4200 can be of various shapes, such as a flat shape.

[0156] The cover 4200 is formed with a resilient finger 4210 and a window 4220. The resilient finger 4210 protrudes from one end of the cover 4200 and is curved, for example, in a U-shape or L-shape. The resilient finger 4210 protrudes from the window 4220 toward one side of the storage recess 4160 when the cover 4200 is closed. The resilient finger 4210 includes a positioning step 4211 protruding from the surface of the resilient finger 4210 near the free end. The storage recess 4160 includes a positioning rib 4161 protruding from the backrest body 4100 toward the storage space formed by the storage recess 4160. The positioning step 4211 can be snapped onto the positioning rib 4161, thereby closing the storage recess 4160.

[0157] The cover 4200 may further include a grip portion 4230 below the elastic fingers 4210. The grip portion 4230 is formed by the cover 4200 being recessed toward the storage recess 4160 when the cover 4200 is closed. The grip portion 4230 is adapted to accommodate a hand so as to apply force to the elastic fingers 4210, thereby releasing the engagement between the positioning step 4211 and the positioning rib 4161, thereby opening the cover 4200.

[0158] When the booster cushion 5000 is directly assembled with the base 200 , an angle adjustment mechanism 6000 may also be provided. In this case, the angle adjustment mechanism 6000 is pivotally connected to the lower surface 5122 (shown in FIG. 18 and FIG. 24 ) of the cushion body 5100 .

[0159] According to the child safety seat 10 and its booster cushion 5000 in the above-described embodiment, the booster cushion 5000 is detachably connected to the backrest 4000 via a connecting mechanism 5200. A retaining mechanism 5300 maintains the engaging member 5210 in the released position when the booster cushion 5000 is detached from the child safety seat 10, making the booster cushion 5000 easy to install. Furthermore, the angle adjustment mechanism 5400 allows the angle of the child safety seat 10 to be adjusted, thereby meeting the comfort requirements of the user of the child safety seat 10 and increasing the use rate of the child safety seat 10. Furthermore, the connecting mechanism 5200 is simple in structure and easy to operate, enabling quick removal and installation of the booster cushion 5000.

[0160] The technical features of the above embodiments can be combined arbitrarily. 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.

[0161] The above embodiments merely illustrate several implementations of the present disclosure, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the patent disclosed herein shall be determined by the appended claims.

Claims

1. A child safety seat (10), characterized in that: include: Safety belt (300); a backrest body (1100) formed with a plurality of gear slots (1400) and a rod (1700) for winding the safety belt (300); and A headrest portion (3000) is movably arranged on the backrest body (1100), and the headrest portion (3000) includes a headrest body (3100) and a headrest adjustment mechanism (3200); Wherein, the headrest adjustment mechanism (3200) comprises: A sliding member (3230), which is connected to the headrest body (3100) and is provided with a housing (3231) and a sliding groove (3234); and The headrest engaging member (3210) is arranged in the sliding groove (3234) and can move between a headrest locking position and a headrest unlocking position. When the headrest engaging member (3210) is located at the headrest locking position, the headrest engaging member (3210) is engaged with one of the multiple gear slots (1400). When the headrest engaging member (3210) is switched to the headrest unlocking position, the sliding member (3230) is disengaged from the multiple gear slots (1400). The headrest body (3100) is provided with a safety belt hole (3130), and at least a portion of the shell (3231) is located above the safety belt hole (3130); the line between the rod (1700) and the safety belt hole (3130) passes through the shell (3231), so that the safety belt (300) arranged between the rod (1700) and the safety belt hole (3130) can be pressed against the shell (3231).

2. The child safety seat (10) according to claim 1, characterized in that The extension surface (S) of the rear surface of the shell (3231) passes through the rod (1700) so that the safety belt (300) located on the front side of the rod (1700) is pressed against the sliding member (3230), while the safety belt (300) located on the rear side of the rod (1700) is spaced apart from the sliding member (3230).

3. The child safety seat (10) according to claim 1, characterized in that The lower end of the rear surface of the shell (3231) has a guide surface (3233) for guiding the safety belt (300), and the guide surface (3233) is an inclined surface or a convex cylindrical surface.

4. The child safety seat (10) according to any one of claims 1 to 3, characterized in that: The backrest body (1100) is provided with a sliding groove (1200), which extends along the longitudinal direction of the backrest body (1100) and passes through the surface of the backrest body (1100), and the sliding member (3230) is slidably fitted with the sliding groove (1200) so that at least a portion of the shell (3231) is inserted into the sliding groove (1200).

5. The child safety seat (10) according to claim 4, characterized in that The rod (1700) is located above the sliding groove (1200).

6. The child safety seat (10) according to claim 4, characterized in that The backrest body (1100) is provided with a first matching portion (1500), and the extension direction of the first matching portion (1500) is parallel to the extension direction of the sliding groove (1200), and the sliding member (3230) is provided with a second matching portion (3235), wherein one of the first matching portion (1500) and the second matching portion (3235) is a groove, and the other of the first matching portion (1500) and the second matching portion (3235) is a rib, and the first matching portion (1500) and the second matching portion (3235) are matched in a concave-convex manner.

7. The child safety seat (10) according to any one of claims 1 to 4, characterized in that The backrest body (1100) is provided with a plurality of shift ribs (1300), each of the shift grooves (1400) is simultaneously formed on the plurality of shift ribs (1300), the opening direction of the plurality of shift grooves (1400) is facing away from the headrest body (3100), and each of the shift grooves (1400) has a downwardly inclined inclined surface, and a stop protrusion (1421) is formed at the end of the inclined surface for preventing the headrest engaging part (3210) from sliding off the inclined surface.

8. The child safety seat (10) according to claim 4, characterized in that Protrusions (1600) are respectively provided on both sides of the sliding groove (1200), and a plurality of the protrusions (1600) are respectively located above and / or below the gear groove (1400).

9. The child safety seat (10) according to any one of claims 1 to 3, characterized in that The rod (1700) comprises a rod body (1710) and a rotating sleeve (1720) rotatably mounted on the rod body (1710), and the safety belt (300) is suitable for being wound around the rotating sleeve (1720).

10. The child safety seat (10) according to claim 1, characterized in that: The headrest adjustment mechanism (3200) further includes a headrest driving member (3260), which is movably connected to the headrest portion (3000) and is drivingly connected to the headrest engaging member (3210); The headrest engaging member (3210) comprises a headrest engaging rod (3211), and the headrest engaging rod (3211) at least partially extends out of the sliding member (3230); The headrest driving member is provided with a driving groove (3261), and the angle between the extension direction of the sliding groove (3234) and the extension direction of the driving groove (3261) is an acute angle; The headrest engaging rod (3211) is inserted into the sliding groove (3234) and the driving groove, and can slide along the extending direction of the sliding groove (3234) and the driving groove (3261).

11. The child safety seat (10) according to claim 1, characterized in that The sliding member (3230) has a first retaining groove (3236), the first retaining groove (3236) is connected to the sliding groove (3234), one end of the first retaining groove (3236) is an open end, and the other end of the first retaining groove (3236) is formed as a limiting end (3237), and at least a portion of the headrest driving member (3260) can be slidably arranged in the first retaining groove (3236) and is suitable for being stopped by the limiting end (3237).

12. The child safety seat (10) according to claim 10, characterized in that The headrest adjustment mechanism (3200) also includes a first reset member (3240), which is arranged between the sliding member (3230) and the headrest driving member (3260), and the first reset member (3240) is suitable for biasing the headrest driving member (3260) to drive the headrest engaging rod (3211) to move toward the headrest locking position.

13. The child safety seat (10) according to claim 12, characterized in that The sliding member (3230) is provided with a first retaining groove (3236) and a second retaining groove (3238) which are interconnected, at least a portion of the headrest driving member (3260) is accommodated in the first retaining groove (3236) and is provided with a contact surface (3225), one end of the first restoring member (3240) is accommodated in the second retaining groove (3238) and abuts against the end of the second retaining groove (3238), and the other end of the first restoring member (3240) extends into the first retaining groove (3236) and abuts against the abutment surface (3225).

14. The child safety seat (10) according to claim 1, characterized in that The headrest portion also includes a headrest operating member (3220), which is operably arranged on the headrest body (3100) and is driven and connected to the headrest driving member (3260). The headrest body (3100) is provided with a penetration channel (3140). The headrest operating member (3220) also includes an operating portion (3221) and a connecting arm (3222) connected between the operating portion (3221) and the headrest driving member (3260). The connecting arm (3222) extends along the longitudinal direction of the headrest body (3100). The operating portion (3221) is movably arranged on the front side of the headrest body. At least a portion of the headrest driving member (3260) passes through the penetration channel (3140) and extends to the back side of the headrest body (3100).

15. A booster seat cushion (5000), comprising: Seat cushion body (5100); a connecting mechanism (5200) provided on the seat cushion body (5100) and adapted to connect to the backrest portion of the child safety seat, the connecting mechanism (5200) comprising a snap-fitting member (5210), the snap-fitting member (5210) being movably connected to the seat cushion body (5100) and switchable between a snap-fitting locking position and a snap-fitting releasing position; and A holding mechanism (5300) is movably connected to the seat cushion body (5100) and can be switched between a holding release position and a holding lock position. When the holding mechanism (5300) is located in the holding lock position, the holding mechanism (5300) is engaged with the connecting mechanism (5200), thereby maintaining the engaging member (5210) in the engaging release position; when the holding mechanism (5300) is located in the holding release position, the holding mechanism (5300) is disengaged from the connecting mechanism (5200), thereby allowing the engaging member (5210) to switch to the engaging lock position.

16. The booster cushion (5000) according to claim 15, characterized in that The retaining mechanism (5300) includes a retaining member (5310) connected to the seat cushion body (5100) and a third restoring member (5320) provided between the retaining member (5310) and the seat cushion body (5100). The retaining member (5310) includes a driving portion (5311) and a transmission portion (5312) connected to the driving portion (5311), the transmission portion (5312) is used to engage the connecting mechanism (5200), the driving portion (5311) is used to drive the retaining member (5310) in the direction of maintaining the unlocking position, and the third reset member (5320) is configured to bias the retaining mechanism (5300) in the direction of maintaining the locking position.

17. The booster cushion (5000) according to claim 16, characterized in that The third restoring member (5320) includes a first elastic member (5321), and the first elastic member (5321) is a compression spring, a tension spring or a spring.

18. The booster cushion (5000) according to claim 16, characterized in that The driving portion (5311) is rotatably arranged on the first pivot (7100) and as the driving portion (5311) moves relative to the seat cushion body (5100), the transmission portion (5312) is rotatably abutted against the first elastic member (5321) or released from abutment with the first elastic member (5321), thereby switching the retaining mechanism (5300) between a retaining release position and a retaining lock position.

19. The booster cushion (5000) according to claim 15, characterized in that The seat cushion body (5100) includes a first shell (5111) and a second shell (5112), wherein the first shell (5111) and the second shell (5112) are engaged and combined to form a seat cushion cavity (5113) of the height-enhancing seat cushion (5000), and the seat cushion cavity (5113) is used to accommodate the connecting mechanism (5200) and the retaining mechanism (5300).

20. The booster cushion (5000) according to claim 19, characterized in that An opening (5151) is formed on the first shell (5111), and the driving part (5311) includes a rotating protrusion (5311a) pivotally connected to the transmission part (5312) through a first pivot (7100). When the retaining mechanism (5300) is located in a locking position, the rotating protrusion (5311a) protrudes out of the seat cushion cavity (5113) through the opening (5151); when the retaining mechanism (5300) is located in a releasing position, the rotating protrusion (5311a) is accommodated in the seat cushion cavity (5113).

21. The booster cushion (5000) according to claim 20, characterized in that The seat cushion body (5100) includes a guide groove (5150) recessed into the internal space of the seat cushion body (5100), and the opening (5151) is located in the guide groove (5150); the rotating protrusion (5311a) has an inclined surface inclined toward the entrance of the guide groove (5150).

22. The booster cushion (5000) according to claim 16, characterized in that The engaging member (5210) includes an engaging connection portion (5211), and the connecting mechanism (5200) further includes a first operating member (5220), wherein the first operating member (5220) is formed with an operating connection portion (5221) and an operating block (5222) integrally formed with the operating connection portion (5221), the transmission portion (5312) is engaged with the operating block (5222), and the engaging connection portion (5211) is engaged with the operating connection portion (5221). 1) A slidable connection allows the engaging member (5210) to switch between the engaging locking position and the engaging releasing position, the operating connection portion (5221) includes a driving slot (5221a), and the engaging connection portion (5211) is a rod, which is connected to the driving slot (5221a) and slides in the driving slot (5221a), thereby allowing the engaging member (5210) to switch between the engaging locking position and the engaging releasing position.

23. The booster cushion (5000) according to claim 22, characterized in that The connecting mechanism (5200) also includes a fourth return member (5230), one end of which is connected to the seat cushion body (5100) and the other end is connected to the engaging member (5210). Through sliding between the engaging connection part (5211) and the operating connection part (5221), the fourth return member (5230) biases the engaging member (5210) toward the engaging locking position. The fourth return member (5230) includes a second elastic member (5231), and the second elastic member (5231) is a spring or a spring.

24. The booster cushion (5000) according to claim 15, characterized in that The engaging member (5210) includes an engaging pin (5212), and the seat cushion body (5100) includes a seat cushion engaging hole (5160). The engaging pin (5212) can be inserted into the seat cushion engaging hole (5160) and protrude from the seat cushion engaging hole (5160), thereby switching between the engaging locking position and the engaging releasing position.

25. The booster cushion (5000) according to claim 22, characterized in that The operating block (5222) is also formed with a first limiting hole (5222b) extending a certain length along its movement direction. The first operating member (5220) includes a limiting column (5240), which passes through the first limiting hole (5222b) and is fixed in the seat cushion body (5100), so that the first operating member (5220) can move relative to the seat cushion body (5100).

26. The booster cushion (5000) according to claim 21, characterized in that An operating recess (5222c) is also formed on the operating block (5222), and the seat cushion body (5100) includes a snap-fit opening (5190). The operating recess (5222c) is formed in a manner of being recessed from the outside toward the inside of the seat cushion body (5100) and exposed outward from the snap-fit opening (5190). The seat cushion body (5100) includes a second limiting rib (5140), and the second limiting rib (5140) is arranged along the movement direction of the first operating member (5220), so that the first operating member (5220) abuts against the second limiting rib (5140).

27. The booster cushion (5000) according to claim 26, characterized in that A limiting protrusion (5222d) is also formed on the operating block (5222), and the limiting protrusion (5222d) protrudes from the side of the operating recess (5222c) on the operating block (5222) that is opposite to the outwardly exposed side. A locking recess (5141) matching the shape of the limiting protrusion (5222d) is formed on the second limiting rib (5140), and the limiting protrusion (5222d) is engaged with or released from the locking recess (5141) as the engaging member (5210) switches between the engaging locking position and the engaging releasing position.

28. A child safety seat (10), characterized in that: include: a backrest (4000), and According to any one of claims 15 to 24, the booster cushion (5000) is detachably connected to the backrest (4000). Wherein, the backrest portion (4000) includes a retaining member driving portion (4140), and when the booster cushion (5000) is connected to the backrest portion (4000), the retaining member driving portion (4140) drives the retaining mechanism (5300) to move relative to the cushion body (5100) to the retaining release position, thereby allowing the engaging member (5210) to switch to the engaging locking position.

29. The child safety seat (10) according to claim 14, characterized in that The backrest portion (4000) includes a backrest body (4100), and the backrest body (4100) also includes a backrest limiting rib (4120) and a snap-fit receiving portion (4130). The seat cushion body (5100) includes a matching rib (5180). The backrest limiting rib (4120) cooperates with the matching rib (5180) to limit the relative movement between the backrest portion (4000) and the height-enhancing seat cushion (5000), and the snap-fit receiving portion (4130) is snap-fitted with the snap-fitting portion (5210).

30. The child safety seat (10) according to claim 29, characterized in that The engaging member (5210) includes an engaging pin (5212), the engaging member receiving portion (4130) includes a backrest engaging hole (4131), the engaging pin (5212) is inserted into the backrest engaging hole (4131), the backrest portion (4000) includes a reinforcing tube (4300), the reinforcing tube (4300) is fixedly installed in the backrest body (4100) and extends from the backrest upper part of the backrest body (4100) to the backrest lower part (4112), and includes a first reinforcing hole (4310) at a position opposite to the engaging member receiving portion (4130), and the engaging member (5210) passes through the engaging member receiving portion (4130) and is inserted into the first reinforcing hole (4310).

31. The child safety seat (10) according to claim 29, characterized in that The retaining member driving portion (4140) includes a driving protrusion (4141) capable of pushing the retaining mechanism (5300) toward a retaining release position when the booster cushion (5000) is connected to the backrest portion (4000).

32. The child safety seat (10) according to claim 28, characterized in that The child safety seat (10) further comprises a base (200) and an angle adjustment mechanism (6000), wherein the base (200) comprises a base body (210), a joint (230) and a pivoting portion (240), wherein the pivoting portion (240) and the joint (230) extend upward from the base body (210) at a certain angle relative to the base body (210), the joint (230) is engaged with the angle adjustment mechanism (6000), and the pivoting portion (240) is rotatably connected to the backrest body (4100) of the backrest portion (4000) via a second pivot (7200), and the angle adjustment mechanism (6000) is movably connected to the base (200) and movably connected to the backrest portion (4000), thereby adjusting the angle of the backrest portion (4000) relative to the base (200).

33. The child safety seat (10) according to claim 32, characterized in that The angle adjustment mechanism (6000) comprises a fifth restoring member (6100) and a second operating member (6200). One end of the fifth restoration member (6100) is connected to the backrest portion (4000) and is movable relative to the backrest portion (4000), and the other end is connected to the second operating member (6200), and One end of the second operating member (6200) is rotatably connected to the backrest body (4100) through a third pivot (7300) and the other end is movably connected to the base (200), and when force is applied to the backrest portion (4000), the second operating member (6200) causes the backrest portion (4000) to move relative to the base (200) through a fifth resetting member (6100).

34. The child safety seat (10) according to claim 33, characterized in that The fifth restoring member (6100) includes a third elastic member (6110), one end of which is connected to the backrest body (4100), and the second operating member (6200) includes a rotating portion (6210) and a sliding portion (6220), the rotating portion (6210) is rotatably connected to the backrest body (4100), and one end of the sliding portion (6220) is connected to the base (200) and the other end is connected to the third elastic member (6110) and can be moved relative to the base (200). 0) slide, the base (200) includes a shift portion (220) protruding from the base body (210), the shift portion (220) includes at least one angular shift slot (221), the at least one angular shift slot (221) is formed at an angle inclined upward from the base body (210) along the running direction of the fifth reset member (6100), the sliding portion (6220) includes a foot that cooperates with the shift portion (220), and the shift pin (7400) passes through the foot and is engaged with the angular shift slot (221).

35. The child safety seat (10) according to claim 34, characterized in that The shift portion (220) further includes an angular shift rib (222), which at least partially surrounds the angular shift slot (221) along the movement direction of the shift pin (7400), thereby stopping the shift pin (7400) in the angular shift slot (221).

36. The child safety seat (10) according to claim 32 or 33, characterized in that The child safety seat (10) further includes a reinforcement tube (4300), which is fixedly mounted in the backrest portion (4000) and includes a second reinforcement hole (4320) at a relative position to the second pivot (7200), and the second pivot (7200) is inserted into the second reinforcement hole (4320) through the connecting hole (4150) in the backrest body (4100).

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