Child safety seat

Abstract

This invention relates to a child safety seat. The child safety seat includes a seat belt, a backrest body, and a headrest. The backrest body has multiple positioning slots and a bar for winding the seat belt. The headrest is movably disposed 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 has a housing and a sliding groove. The headrest engaging member passes through the sliding groove and moves 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 multiple positioning slots, and when the headrest engaging member switches to the headrest unlocking position, the slider disengages from the positioning slot. The headrest body has a seat belt through-hole, and at least a portion of the housing is located above the seat belt through-hole. A line connecting the bar and the seat belt through-hole passes through the housing so that the seat belt disposed between the bar and the seat belt through-hole can press against the housing.

Description

Technical Field

[0001] The present invention relates to the technical field of children's products, and in particular to a child safety seat. Prior 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, and the mechanism can accidentally unlock when used on bumpy roads, 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 via 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 invention 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 arranged on the backrest body and includes a headrest body and a headrest adjustment mechanism. The headrest adjustment mechanism includes a sliding member and a headrest engaging member. The sliding member is connected to the headrest body and is provided with a shell 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 switches to the headrest unlocking position, the sliding member disengages from the plurality of gear slots. The headrest body is provided with a safety belt passage, and at least a portion of the shell is located above the safety belt passage. The connecting line between the rod and the safety belt hole passes through the shell so that the safety belt disposed between the rod and the safety belt hole can be pressed against the shell.

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

[0006] In the above-mentioned 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 configured with multiple gear ribs, and each gear groove is formed on multiple gear ribs at the same time. The opening direction of the multiple gear grooves is away from the headrest body, and each gear groove has a downward inclined surface. 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-mentioned first aspect, protrusions are respectively provided on both sides of the sliding groove, and the multiple protrusions are respectively located above and / or below the gear groove.

[0011] In the above-mentioned first aspect, the axis of the rod is located forward of the extension surface of the rear surface of the housing.

[0012] In the above 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.

[0013] In the first aspect described above, the headrest adjustment mechanism further includes a headrest drive member, 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 drive member 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.

[0014] 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.

[0015] In the above first aspect, the headrest adjustment mechanism further includes a first reset member, which is arranged between the sliding member and the headrest driving member, and is suitable for biasing the headrest driving member to drive the headrest engaging rod to move toward the headrest locking position.

[0016] In the first aspect mentioned above, 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 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.

[0017] In the above-mentioned first aspect, 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.

[0018] A second aspect of the present invention 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 the backrest portion of a child safety seat. The connecting mechanism comprises a latching member that is movably connected to the seat cushion body and is switchable between a latching lock position and a latching release position. The retaining mechanism is movably connected to the seat cushion body and is switchable between a retaining release position and a retaining lock position. When the retaining mechanism is in the retaining lock position, the retaining mechanism engages with the connecting mechanism, thereby retaining 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 lock position.

[0019] In the second aspect described above, 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 a released position, and the third return member being configured to bias the retaining mechanism toward a direction in which the retaining member is retained in a locked position.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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 and form a seat cushion cavity of the booster seat cushion, and the seat cushion cavity is used to accommodate the connecting mechanism and the retaining mechanism.

[0024] 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 holding mechanism is in the holding locking position, the rotating protrusion protrudes from the opening to the outside of the seat cushion cavity; when the holding mechanism is in the holding releasing position, the rotating protrusion is accommodated in the seat cushion cavity.

[0025] In the above-mentioned second aspect, the seat cushion body includes a guide groove recessed toward the internal space, the opening is located in the guide groove; and the rotating protrusion has an inclined surface inclined toward the entrance of the guide groove.

[0026] 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 releasing position, and the operating connection portion includes a driving groove, and the engaging connection portion is a rod, and the rod 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 releasing position.

[0027] 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 the 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, and the second elastic member is a spring or a spring.

[0028] In the above-mentioned 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.

[0029] In the second aspect, the operating block further comprises a first limiting hole extending a certain length along its direction of movement. The first operating member comprises a limiting post that passes through the first limiting hole and is fixed to the seat cushion body, thereby enabling the first operating member to move relative to the seat cushion body.

[0030] 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.

[0031] In the above-mentioned second aspect, a limiting protrusion is further 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. 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 member switches between the engaging locking position and the engaging releasing position.

[0032] 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.

[0033] In the aforementioned second aspect, 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.

[0034] A third aspect of the present invention 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. When the booster cushion is connected to the backrest portion, the retainer driving unit 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.

[0035] In the third aspect, the backrest portion includes a backrest body, the backrest body including a backrest limiting rib and a latch receiving portion. The seat cushion body includes a mating rib, the backrest limiting rib cooperating with the mating rib to limit relative movement between the backrest portion and the booster cushion, and the latch receiving portion engages with the latch.

[0036] 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.

[0037] In the third aspect described above, the retaining member driving portion includes a driving protrusion, and the driving protrusion is capable of pushing the retaining mechanism toward the retaining release position when the booster seat cushion is connected to the backrest portion.

[0038] 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.

[0039] 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.

[0040] 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 groove, the at least one angular gear groove 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 cooperating with the gear part, and the gear pin passes through the base foot and is engaged with the angular gear groove.

[0041] In the third aspect above, the shift portion further comprises an angular shift rib, which at least partially surrounds the angular shift slot in the direction of movement of the shift pin, thereby stopping the shift pin in the angular shift slot.

[0042] In the third aspect above, 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 the connection hole in the backrest body.

[0043] 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 the 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.

[0044] 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 one side of the storage recess when the cover body is closed. The resilient finger includes a positioning step protruding from the surface of the resilient finger near the 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.

[0045] In the third aspect above, the child safety seat further includes a headrest detachably assembled on an upper portion of the backrest portion and adapted to receive a child's head. Simple diagram description

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without making any further efforts. 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. FIG. 1 shows a perspective view of a child safety seat according to an embodiment of the present invention. FIG. 2 shows a perspective view of the child safety seat in FIG. 1 with the headrest adjusted upward. 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. FIG. 4 shows a perspective view of the child safety seat in FIG. 2 from another perspective after one of the sliding members is removed. FIG. 5 shows a partial view of a cross-sectional view of the child safety seat along line U1 - U1 in FIG. 3 . FIG6 shows a partial view of a cross-sectional view of the child safety seat in FIG3 along the line U1 - U1 after the headrest is raised. FIG. 7 shows a cross-sectional view of the child safety seat along line U2 - U2 in FIG. 1 . FIG. 8 shows a perspective view of a headrest according to an embodiment of the present invention. FIG. 9 shows a perspective view of the headrest of FIG. 7 with one of the slides removed. FIG. 10 is a perspective view of the headrest in FIG. 8 from another viewing angle. FIG. 11 is a cross-sectional view of the headrest portion taken along line U3 - U3 in FIG. 10 . FIG. 12 illustrates a perspective view of a slider according to an embodiment of the present invention. FIG. 13 shows a perspective view of a child safety seat according to another embodiment of the present invention. FIG. 14 shows a perspective view of the booster cushion of FIG. 13 . FIG. 15 shows a perspective view of the child safety seat of FIG. 13 with the booster cushion removed. FIG. 16 shows a perspective view of the booster cushion in FIG. 14 from another perspective. FIG. 17 shows a perspective view and a partially enlarged view of the child safety seat of FIG. 13 with the booster cushion removed. FIG. 18 is a bottom oblique view of the booster cushion in FIG. 13 . FIG19 is a cross-sectional view and a partially enlarged view of the child safety seat along A1-A1 in FIG13 , wherein the booster cushion is fully integrated into the child safety seat. FIG20 shows a cross-sectional view and a partially enlarged view of the child safety seat along A2-A2 of FIG13 , wherein the booster cushion has not yet been fully assembled into the child safety seat. 21 illustrates a perspective view of a booster cushion with the second shell removed, with the connection mechanism in an engaged and locked position, according to an embodiment of the present invention. FIG22 shows a cross-sectional view of the child safety seat along line BB in FIG13 , wherein the connecting mechanism is in a locked position. 23 illustrates a perspective view of a booster cushion with the second shell removed, with the connection mechanism in an engaged and unlocked position, according to an embodiment of the present invention. 24 illustrates a perspective view of a booster cushion from another perspective according to an embodiment of the present invention, showing the bottom of the booster cushion with the connection mechanism in an engaged and unlocked position. 25 shows a perspective view of the booster seat cushion according to an embodiment of the present invention after the second shell is removed, from another viewing angle, wherein the connecting mechanism is in a snap-locked position. 26 illustrates a booster cushion according to an embodiment of the present invention from another perspective, wherein the connecting mechanism is in an engaged and locked position. FIG. 27 shows a perspective view of the child safety seat in FIG. 13 from another perspective. FIG. 28 shows a cross-sectional view of the child safety seat along CC in FIG. 27 , wherein the angle adjustment mechanism is adjusted to a minimum height relative to the base. FIG. 29 shows a cross-sectional view of the child safety seat along CC in FIG. 28 , wherein the angle adjustment mechanism is adjusted to another height relative to the base. 30 illustrates a perspective view of a base according to an embodiment of the present invention. FIG31 is a bottom schematic diagram of a child safety seat with the base removed according to an embodiment of the present invention. FIG. 32 is a schematic diagram showing a cross section of the child safety seat in FIG. 27 taken along line DD. FIG33 shows a perspective view of a child safety seat according to an embodiment of the present invention, with a storage cup on one side removed. FIG. 34 shows a perspective view of a storage cup. FIG35 shows a perspective view of the child safety seat of FIG13 from another perspective, with the cover closing the storage recess. FIG. 36 shows a cover according to an embodiment of the present invention. FIG37 is a schematic diagram of the child safety seat in FIG35 with the cover removed. 38 shows a partially exploded view of a child safety seat according to an embodiment of the present invention, with the seat shell removed. Implementation Method

[0047] To make the above-mentioned objectives, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0048] 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 intervening features and / or elements may also be present. In contrast, when a feature or element is referred to as being "directly on" another feature or element, there are no intervening features or elements present. It will also be understood that when a feature or element is referred to as being "connected," "attached," or "joined" to another feature or element, it can be directly connected, attached, or joined to the other feature or element, or there may be intervening features or elements present. In contrast, when a feature or element is referred to as being "directly connected," "directly attached," or "directly joined" to another feature or element, there are no intervening features or elements present.

[0049] 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 specifically indicated. These terms can be used to distinguish one feature or element from another. Thus, the first feature or element discussed below could be referred to as the second feature or element, and similarly, the second feature or element discussed below could 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 limitation of quantity. Words such as "include" or "comprising" mean that the element or item preceding the word includes the elements or items listed after the word and their equivalents, but do not exclude other elements or items. 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. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. Unless otherwise specified, the terms "upward", "downward", "vertical", "horizontal", etc. used herein are for illustrative purposes only.

[0050] 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 seatback; "left" refers to the left side when viewed from the rear to the front of the child safety seat; and "right" refers to the right side 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" regarding various components of a child safety seat herein 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 invention and are not intended to unduly limit the scope of protection of the present invention.

[0051] Figures 1 to 4 schematically illustrate a child safety seat 10 according to one embodiment of the present invention. The child safety seat 10 includes a base 200 and a seat assembly 100 mounted 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.

[0052] 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.

[0053] 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 standalone use. In the first mode, the seat 2000 and the backrest 1000 together define the seating space of the child safety seat 10, with the child restrained within the seating space by the seat belt 300. The first mode 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 either forward-facing or rear-facing. In the second mode, the seat 2000 and the backrest of the vehicle seat together define the seating space of the seat 2000, with the child restrained within the seating space by the vehicle seat belt. The second mode 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."

[0054] The backrest 1000 includes a backrest body 1100 having a front face 1110 and a back face 1120 disposed opposite each other. The seat 2000 is connected to the backrest body 1100, with the upper surface of the seat 2000 forming a seating surface 2100 suitable for children. The front face 1110 of the backrest body and the seating surface 2100 of the seat 2000 together define a seating space. The longitudinal direction of the backrest body 1100 is substantially perpendicular to the seating surface 2100 of the seat 2000. In this embodiment, the seat 2000 is arranged at an angle relative to the base 200. Specifically, the seating surface 2100 of the seat 2000 is arranged at an angle relative to the lower surface of the base 200. The lower surface of the base 200 is substantially 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 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 face 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 through 10 .

[0055] 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, which is equivalent to extending approximately in the height direction of the backrest body 1100 and through the front 1110 and back sides of the backrest body. The plurality of shifting ribs 1300 are disposed on either side of the sliding groove 1200 and extend longitudinally along the backrest body 1100. The plurality of shifting grooves 1400 are formed on the plurality of shifting ribs 1300 and are 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 plurality of shifting grooves 1400 are used to lock the headrest 3000 at a corresponding height. The structure of the headrest portion 3000 will be described in detail later.

[0056] 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 the 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 the 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.

[0057] In some alternative embodiments, the number of shift ribs 1300 may be one, two, or greater than three, and the number of sliding grooves 1200 may be one or greater than two, and this is not limited in this application. Exemplarily, there is one shift rib 1300 and one sliding groove 1200, and the shift rib 1300 is located on one side of the sliding groove 1200 (e.g., the left or right side). Exemplarily, there are two shift ribs 1300 and one sliding groove 1200, with the two shift ribs 1300 located on the left and right sides of the sliding groove 1200, respectively. Exemplarily, there are greater than three shift ribs 1300 and two or greater than two sliding grooves 1200, with the sliding groove 1200 formed between two adjacent shift ribs 1300.

[0058] With reference to Figures 5 and 6 , the opening of each shift slot 1400 faces away from the headrest body 3100. Specifically, the opening faces generally rearward and is slightly inclined downward. More specifically, each shift slot 1400 comprises an upper sidewall 1410, a lower sidewall 1420, and a bottom wall 1430. The bottom wall 1430 is an arcuate surface. The lower sidewall 1420 is inclined relative to the bottom wall 1430 and forms an obtuse angle with the bottom wall 1430. Specifically, the lower sidewall 1420 is a downwardly inclined surface. The upper sidewall 1410 is arcuate and smoothly transitions to the bottom wall 1430. A limiting protrusion 1411 is provided on the upper sidewall 1410 near the opening of the shift slot 1400. The limiting protrusion 1411 protrudes downward from the upper sidewall 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 of the bottom wall 1430 at the lowest point in the direction perpendicular to the longitudinal direction and the lower side wall 1420 is an obtuse angle.

[0059] 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 each other. 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 each other. 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.

[0060] Figures 8 to 10 schematically illustrate a headrest 3000 according to one embodiment of the present invention. The headrest 3000 includes a headrest body 3100 and a headrest adjustment mechanism 3200. Referring 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 phrase "the headrest adjustment mechanism 3200 is disposed between the headrest body 3100 and the backrest body 1100" should be understood to mean that at least a portion of the headrest adjustment mechanism 3200 is located between the headrest body 3100 and the backrest body 1100, and that the headrest adjustment mechanism 3200 is connected to each of 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, 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), it engages with the backrest body 1100 to restrict relative sliding between the slider 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 slider 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.

[0061] 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 beyond 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. This in turn limits the longitudinal movement of the slider 3230 along the backrest body 1100, thereby 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 block 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.

[0062] Referring to Figures 3 and 4 , the portion of the headrest engaging rod 3211 extending from the sliding member 3230 engages with the first, second, and third gear recesses 1400a, 1400b, 1400c of the corresponding gear slots 1400. Referring to Figures 6 and 7 , each gear slot 1400 has a downwardly inclined surface, the 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 plane of the stopper protrusion 1421 is substantially parallel to the horizontal plane. In other words, the plane 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 is 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 .

[0063] 5 and 6 , at least a portion of the headrest body 3100 is slidably mounted on the front face 1110 of the backrest body 1100. The slider 3230 is slidably mounted on the back face 1120 of the backrest body 1100 and connected to the headrest body 3100 via the sliding groove 1200. This allows the headrest body 3100 and the slider 3230 to slide synchronously relative to the backrest body 1100 or be synchronously positioned at corresponding heights. The headrest body 3100 is provided with a mounting portion 3120. This mounting portion 3120 protrudes 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 is movable along the sliding groove 1200. Optionally, the mounting portion 3120 is integrally formed with the headrest body 3100, or is fixed (i.e., non-detachably) to the headrest body 3100 by, for example, bonding, or is detachably attached to the headrest body 3100 by, for example, bolting, etc., without limitation in this application. Referring to Figures 8 and 9 , the sliding member 3230 is detachably connected to the mounting portion 3120 by, for example, bolting, snapping, or the like. The side of the headrest body 3100 facing the backrest body 1100 forms the back side 3112 of the headrest body, and the side of the headrest body 3100 opposite the back side forms the front side 3111 of the headrest body.

[0064] With reference to Figure 7 , the backrest body 1100 is provided with a first mating portion 1500 extending parallel to the direction of extension of the sliding groove 1200. The sliding member 3230 is provided with a second mating portion 3235. One of the first mating portion 1500 and the second mating portion 3235 is a groove, and the other is a rib. The first mating portion 1500 and the second mating portion 3235 mate with each other in a concave-convex manner, allowing the sliding member 3230 to slide relative to the backrest body 1100 along the direction of extension of the first mating portion 1500. In this embodiment, the first mating portion 1500 is a groove, and the second mating portion 3235 is a rib. The back surface 1120 of the backrest body is provided with at least one set of first mating portions 1500, with each set of at least two first mating portions 1500. At least one first mating 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, meaning each group of mating portions consists of 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, while 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.

[0065] Accordingly, the number of sliding members 3230 matches the number of sliding grooves 1200. In this embodiment, there are two sliding members 3230, each corresponding to the first sliding groove 1210 and 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, allowing 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.

[0066] For ease of description, the following description takes the sliding member 3230 located at the second sliding groove 1220 as an example.

[0067] 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 has 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 through 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.

[0068] 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. This, by utilizing the relative position of the reinforcing rod 1700 and the belt opening 3130, changes the extension direction of the seat belt 300, allowing the seat belt 300 to partially press against the slider 3230, thereby exerting pressure on the slider 3230. This pressure can be 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, thereby preventing the headrest engaging member 3210 from "jumping" due to the vehicle's jolt. 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 higher position (i.e., a position relatively far away from the seat 2000) to a relatively lower position (i.e., a position relatively close to the seat 2000).

[0069] 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 respectively abut against each other, causing the extension direction of the seat belt 300 to shift, so that a portion of the seat belt 300 can be pressed against the sliding member 3230.

[0070] 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 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 ensures that the seat belt 300 is 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.

[0071] 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, a 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 it easier to pull the belt. 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.

[0072] 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. In other words, 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.

[0073] 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 each side of the sliding groove 1200, with multiple protrusions 1600 located above and / or below the shift groove 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 on the first ends of the plurality of shift ribs and second protrusions 1620 disposed on 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 raised portion 1600 can be used to limit and stop the headrest engaging rod 3211, thereby preventing the headrest engaging rod 3211 from escaping from the multiple gear slots 1400; on the other hand, the raised portion 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 preventing the seat belt 300 from interfering with the gear ribs 1300.

[0074] Referring to Figures 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 generally parallel to the longitudinal direction of the backrest body 1100, and the movement direction of the headrest operating member 3220 is generally perpendicular to the movement direction of the headrest engaging rod 3211.

[0075] 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 driver 3260. In other words, the operating portion 3221, the operating connection portion 3223, the connecting arm 3222, and the headrest driver 3260 are sequentially connected. The number of headrest drivers 3260 corresponds to the number of sliding members 3230. In this embodiment, the headrest operating member 3220 includes two headrest drivers 3260, two connecting arms 3222, an operating connection portion 3223, and an operating portion 3221. The two headrest drivers 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 drivers 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 longitudinal movement of the operating portion 3221 along the headrest body 3100 and drives the two headrest driving members 3260 to move longitudinally through the operating connecting portion 3223 and the two connecting arms 3222.

[0076] As shown in conjunction with 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 restrained on the headrest body 3100 by the fixing base 3300 and can move relative to the headrest body 3100 along with the operating portion 3221, thereby slidably restraining the headrest operating member 3220 on the headrest body 3100. The operating connection portion 3223 is generally plate-shaped and disposed parallel to the front face of the headrest body 3100. The fixing base 3300 is secured to the headrest body 3100 by, for example, a threaded connection or a snap-on connection, but is not limited thereto. The fixing base 3300 is provided with a limiting portion 3310 that is detachably connected to the front face 3111 of the headrest body. Specifically, the limiting portion 3310 includes a limiting wall 3311, two connecting ears 3312 provided on the limiting wall 3311, and a limiting pin 3313 connected to the limiting wall 3311. The limiting wall 3311 is detachably connected to the headrest body 3100 via the two connecting ears 3312. The limiting pin 3313 extends generally downward and is used for detachable connection with the headrest body 3100. In this embodiment, the operational connection portion 3223 is disposed between the limiting wall 3311 and the headrest body 3100 and is connected to the headrest body 3100 via the limiting pin 3313, thereby being fixed between the limiting wall 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 connecting 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 .

[0077] The fixed seat 3300 is also provided with a seat body 3320, which is connected to the limiting wall 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, without limitation in this application. The operating portion 3221 is located between the seat body 3320 and the limiting wall 3311. The operating portion 3221 protrudes rearward from the operating connection portion 3223, which not only facilitates operation of the operating portion 3221, but also allows the limiting wall 3311 to block the operating portion 3221, preventing it from passing over the limiting wall 3311, thereby limiting the operating portion 3221 within the limiting space 3330.

[0078] As shown in Figures 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 through the through-channel 3140 and 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.

[0079] Referring to Figures 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 movement direction 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 walls of the sliding groove 3234, causing the headrest engaging rod 3211 to move 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, which is directly opposite the sliding groove 3234 provided on the sliding member 3230. As shown in conjunction with 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.

[0080] 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 directly opposes the through-channel 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-channel 3140. At least a portion of the headrest driver 3260 is accommodated within the first receiving groove 3236. This facilitates 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 forms a stopper 3237. Specifically, the end of the first receiving groove 3236 adjacent to the second receiving groove 3238 forms the stopper 3237. The first receiving groove 3236 extends longitudinally, i.e., 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.

[0081] As shown in Figures 5 and 6, in one embodiment, the headrest adjustment mechanism 3200 further includes a first return member 3240 disposed between the slider 3230 and the headrest driver 3260. The first return member 3240 is adapted to bias the headrest driver 3260 to drive the headrest engagement rod 3211 toward the headrest locking position. Thus, when the headrest operating member 3220 is not operated, the elastic restoring force of the first return member 3240 causes the headrest operating member 3220 to return to its original position and drives the headrest engagement rod 3211 toward the headrest locking position. Specifically, at least a portion of the headrest driver 3260 is accommodated within the first receiving groove 3236 and is provided with a flat abutment surface 3225. The first return member 3240 is, for example, a compression spring. One end of the first restoring member 3240 is received in the second receiving groove 3238 and abuts the end of the second receiving groove 3238. The other end of the first restoring member 3240 extends into the first receiving groove 3236 and abuts the abutment surface 3225. More specifically, a first boss 3239 is provided at the end of the second receiving groove 3238, and is disposed opposite the abutment surface 3225. One end of the first restoring member 3240 is sleeved onto the first boss 3239 and abuts the end of the second receiving groove 3238. The other end of the first restoring member 3240 abuts the abutment surface 3225. Sleeving the first restoring member 3240 onto the first boss 3239 prevents the first restoring member 3240 from shifting.

[0082] In this embodiment, there is one first restoring member 3240. The first restoring member 3240 is disposed within the sliding member 3230 disposed opposite the second sliding groove 1220. In other embodiments, the number of first restoring members may be two or more, with each sliding member 3230 being provided with a first restoring member 3240.

[0083] 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 configured 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 within the accommodating groove 3321. One end of the second restoring member 3250 abuts the bottom wall of the accommodating groove 3321, and the other end of the second restoring member 3250 abuts 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 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 the bottom wall of the accommodating recess 3226.

[0084] The operating principles of the child safety seat 10 and the headrest 3000 thereof provided in accordance with an embodiment of the present invention are as follows.

[0085] 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 upward. The two headrest drivers 3260, through the driving grooves 3261 provided therein, engage with the headrest engaging rods 3211, driving the headrest engaging rods 3211 rearward along the sliding grooves 3234, causing them to exit the corresponding shifting 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 align directly with one of the shifting slots 1400. At this point, the headrest operating member 3220 is released, and the headrest driving member 3260 moves and resets under the elastic restoring force of the first reset member 3240. The driving engagement between the driving slot 3261 and the headrest engaging rod 3211 causes the headrest engaging rod 3211 to move forward and engage with the opposite shift slot 1400. Simultaneously, the operating portion 3221 further moves and resets under the elastic restoring force of the second reset member 3250.

[0086] The headrest 3000 and the child safety seat 10 having the same, provided in accordance with an embodiment of the present invention, have at least the following beneficial effects: The headrest operating member 3220 drives the headrest engaging member 3210 to switch between a headrest locking position and a headrest unlocking position, causing the headrest engaging member 3210 disposed on the headrest slider 3230 to selectively engage with the backrest body 1100, thereby selectively restricting or allowing relative movement between the headrest slider 3230 and the backrest body 1100, thereby simultaneously restricting or allowing relative movement between the headrest body 3100 and the backrest body 1100. This allows for height adjustment of the headrest 3000 (i.e., the headrest body 3100). The headrest 3000 provided in this embodiment of the present invention has a simple structure and is easy to operate.

[0087] Figures 13, 27, and 35 schematically illustrate a child safety seat 10 according to another embodiment of the present invention. The child safety seat 10 can be secured to a vehicle seat using, for example, ISOFIX connectors, top straps, or other structures, or can be secured to the vehicle seat using the vehicle's seatbelts. The child safety seat 10 can include a backrest 4000 and a booster cushion 5000 according to some embodiments of the present invention. The booster cushion 5000 can correspond to the seat 2000 described in the above embodiments; that is, the seat 2000 in the above embodiments can be replaced by the booster cushion 5000. The booster cushion 5000 will be described below along with the child safety seat 10.

[0088] 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 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., four to twelve 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, meeting the needs of children of different ages and increasing the utilization rate of the child safety seat 10.

[0089] 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 disposed 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 desired position.

[0090] 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.

[0091] Referring to Figures 15 and 20 , the backrest 4000 includes a backrest body 4100, which includes backrest limiting ribs 4120, engaging member receiving portions 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 engaging member receiving portions 4130 are adapted to receive the engaging member 5210 of the connecting mechanism 5200. In this embodiment, the engaging member receiving portions 4130 are backrest engaging holes 4131. The backrest limiting ribs 4120, engaging member receiving portions 4130, and retaining member driving portion 4140 may also be located elsewhere on the backrest body 4100. For example, the engaging member receiving portions 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.

[0092] 15 , 17 , and 18 , the retainer driving portion 4140 can protrude from the backrest body 4100. Specifically, the retainer driving portion 4140 can include a driving protrusion 4141 that can gradually increase 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 the child safety seat 10 or assembly thereof. The retainer driving portion 4140 can 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, can abut against the retaining mechanism 5300, thereby driving the retaining mechanism 5300 to move relative to the seat cushion body 5100.

[0093] Referring to Figures 21, 22, and 23, the retaining mechanism 5300 includes a retaining member 5310 connected to the seat cushion body 5100 and a third return 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 return 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 sheet formed at one end of the retaining member 5310 , and the elastic sheet may be detachably pressed against the seat cushion body 5100 .

[0094] The connecting mechanism 5200 is disposed on the seat cushion body 5100 and includes a latching member 5210 and a first operating member 5220 connected to the latching member 5210 and movably connected to the seat cushion body 5100. The latching member 5210 includes a latching connection portion 5211 connected to the first operating member 5220 and a latching pin 5212. The latching pin 5212 can be integrally formed with the latching connection portion 5211 or separately formed. The latching pin 5212 passes through the seat cushion latching hole 5160 of the seat cushion body 5100 and latches with the backrest latching hole 4131 (see FIG. 15 ) of the backrest portion 4000. In this embodiment, the latching member 5210 is in the form of a pin; however, the latching member 5210 may also have other shapes. In this case, the latching member receiving portion 4130 is shaped to match the latching member 5210.

[0095] Referring to Figures 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 at a predetermined angle to the direction of movement of the engaging pin 5212 relative to the back-receiving engaging hole 4131. The length of the drive groove 5221a in the direction of movement of the engaging pin 5212 relative to the back-receiving engaging hole 4131 is greater than or equal to the distance the engaging pin retracts from the back-receiving 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 engaging connection portion 5211. The gear is rotated by controlling the handle, so that the engaging connection portion 5211 drives the engaging pin 5212 to follow the movement of the chain engaged on the gear and pass through the seat cushion engaging hole 5160 of the seat cushion body 5100 and insert into the backrest engaging hole 4131 on the backrest 2, thereby switching the engaging member 5210 between the engaging locking position and the engaging releasing position.

[0096] 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 locking 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 against 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. This rod can slide within the drive slot 5221a, thereby switching the engaging member 5210 between the engaged locking position and the engaged unlocking position. In another embodiment, the connecting mechanism 5200 may not include the fourth restoring member 5230.

[0097] 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 on the first housing 5111. An opening 5151 is defined 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 orientation, 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 .

[0098] The transmission unit 5312 may include a crossbar 5312a, and the third return 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 unit 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.

[0099] The transmission portion 5312 may include a snap-fit ​​end 5312b, as shown in FIG25 , which snaps into engagement with a blocking rib 5222a formed on the operating block 5222. The shape of the snap-fit ​​end 5312b may be modified according to actual conditions, as long as it can snap fit the operating member 322.

[0100] 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 direction of movement 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.

[0101] Referring to Figures 23, 24, and 25, the operating block 5222 is formed with a first limiting hole 5222b extending a certain 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 generally 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 outward from the snap-fit ​​opening 5190.

[0102] The seat cushion body 5100 includes a second limiting rib 5140, which protrudes relative to the seat cushion 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 body 5100, or cause the first operating member 5220 to rotate and lose its function.

[0103] 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 block 5222. 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.

[0104] 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 cushion 5000 is gradually removed from the backrest 4000, the driving protrusion 4141 moves away from the driving protrusion 4141, and the force applied to the crossbar 5312a decreases until it disappears. The first elastic member 5321, through its restoring force, pushes away from the crossbar 5312a. Under the action of the thrust, the engaging end 5312b, which is integrally formed with or fixedly connected to the crossbar 5312a, moves toward the first operating member 5220 and engages with the blocking rib 5222a of the first operating member 5220, thereby retaining the first operating member 5220 in the released position, that is, retaining 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 portion 4140 pushes against the driving portion 5311, causing the driving portion 5311 to rotate relative to the seat cushion body 5100 about the first pivot 7100. As the drive unit 5311 rotates, the transmission unit 5312 connected to the drive 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 first elastic member 5321 pushes the engagement pin 5212 from the seat cushion engagement hole 5160 into the backrest engagement hole 4131, allowing the engagement member 5210 to switch to the engaged and locked position.

[0105] 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 capable of sliding 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.

[0106] 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 the 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 capable of blocking the driving portion 5311 can be provided on the backrest body 4100. 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. During disassembly, 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.

[0107] 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 thereto. They form first holes 5171 for the vehicle seat belt to pass through. The armrests 5170 may also include a storage recess 5172 formed by a portion of the seat cushion body 5100 outside the seat cushion cavity 5113 and providing 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.

[0108] 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.

[0109] 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, which is not a limitation of 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.

[0110] Referring to Figures 29, 30, and 32, the base 200 may include a base body 210, a joint 230, and a pivoting portion 240. The base 200 may be integrally formed. Alternatively, it may be formed by snapping together an upper base shell 201 and a lower base shell 202. The lower surface 5122 may be flat to facilitate mounting the booster cushion 5000 or child safety seat 10 on a vehicle seat. The pivoting portion 240 and the joint 230 extend upward at a predetermined angle relative to the upper base surface 211 of the base body 210. The joint 230 engages with the angle adjustment mechanism 6000. The pivoting portion 240 is rotatably connected to the backrest body 4100 of the backrest 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.

[0111] 28 , 29 and 38 , the angle adjustment mechanism 6000 is movably connected to the base 200 and 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.

[0112] 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.

[0113] 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 housing 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.

[0114] Referring to Figures 30 and 38 , the base 200 includes a shift portion 220 protruding from the base upper surface 211 of the base body 210. The center of the top 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.

[0115] 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 each leg 6221 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, causing the shift pin 7400 to disengage from the angular shift slot 221 and engage 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, 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 in the direction of movement of the shift pin 7400, thereby retaining the shift pin 7400 in the angular shift slot 221. Referring to Figures 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 resting a child's back) to the lower backrest portion 4112 (the portion for accommodating the buttocks). 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.

[0116] Referring to Figures 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 the side encompassed by the backrest portion 4000 and the booster cushion 5000 (the side where the passenger compartment 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, thereby closing the storage recess 4160. The cover 4200 can have various shapes, such as a flat shape.

[0117] 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- 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 its surface near its 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 engaged with the positioning rib 4161, thereby closing the storage recess 4160.

[0118] The cover 4200 may also be formed with a grip portion 4230 below the elastic fingers 4210. The grip portion 4230 is formed by the cover 4200 being recessed in the direction of the storage recess 4160 when the cover 4200 is closed. The grip portion 4230 is suitable for receiving a hand 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.

[0119] 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 .

[0120] 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.

[0121] 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.

[0122] The above examples merely illustrate several implementations of the present invention. 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 those skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and these variations and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be based on the scope of the appended patent application.

[0123] 10: Child safety seat 200: Base 201: base upper shell 202: base lower shell 210: Base body 211: Upper surface of base 220: gear position 221: Angle gear slot 222: Angle gear rib 223: Concave platform 230: Joint 240: pivoting portion 100: Seat assembly 1000: backrest 1100: Back to the main body 1110: Back against the front of the main body / front 1120: Back of the back body 1200: Slide trough 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 slot 1400a: first gear recess 1400b: Second gear recess 1400c: Third gear recess 1410: Upper side wall of the gear slot / upper side wall 1411: limiting convex 1420: Lower side wall of the gear slot / lower side wall 1421: Stop convex part 1430: Bottom wall of the gear slot 1500: first matching part 1600: Raised part 1610: first protrusion 1620: Second raised portion 1700:Reinforcement rod 1710: Rod body 1720: Rotating sleeve 2000: Seat 2100: boarding 3000: Headrest 3100: Headrest body 3111: Front of the headrest body / front 3112: Back of the headrest body / back 3120: Installation Department 3130: Seat belt opening 3140: Passageway 3150: Adaptation 3200: Headrest adjustment mechanism 3210:Headrest snap-on fitting 3211: Headrest locking rod 3220: Headrest operating part 3221: Operation Department 3222:Connecting arm 3223: Operation connection part 3225: abutment surface 3226: Accommodating recess 3227:Connection opening 3230: Sliding parts 3231: Shell 3232: Upper side 3233:Guide surface 3234: Sliding groove 3235: Second matching part 3236: First holding tank 3237:Limited end 3238: Second holding tank 3239: First boss 3240: First reset member 3250: Second reset member 3260: Headrest drive 3261:Drive slot 3300:Fixed seat 3310:Limiting part 3311: limiting wall 3312: Connecting ear 3313: Limit pin 3320: Seat body part 3321: receiving slot 3330: Limited Space 3340: Second boss 4000: backrest 4100: Back to the main body 4111:Back on the upper part 4112: Back lower part 4120: Back limit rib 4130: Snap-fit ​​receiving portion 4131: Back locking hole 4140: Holding member driving portion 4141:Drive bump 4142: Concave 4150:Connection hole 4160: Storage recess 4161: Positioning rib 4162: Storage connection slot 4200: Cover 4210: Elastic fingers 4211: Positioning step 4220:Window 4230:Handheld 4240: Cover connecting rod 4300:Reinforced pipe 4310: First reinforcement hole 4320: Second reinforcement hole 5000: Booster seat cushion 5100: Seat cushion body 5111: First shell 5112: Second shell 5113: Seat Cavity 5121: Upper surface 5122: lower surface 5130: First limiting rib 5140: Second limiting rib 5141: snap-fit ​​recess 5150: Boot slot 5151: Opening 5160: Seat cushion engagement hole 5170: Armrest 5171:First set of holes 5172: Storage recess 5172a: Storage connection hole 5172b: Connection slot 5180:Matching rib 5190: snap-fit ​​opening 5200:Connecting mechanism 5210: snap-fit ​​piece 5211: snap-fit ​​connection 5212: Locking pin 5220: First operating member 5221: Operation connection part 5221a: Drive slot 5222: Operation block 5222a: Barrier rib 5222b: first limiting hole 5222c: Operating recess 5222d: Limiting bump 5222e: Operation block space 5230: Fourth reset element 5231: Second elastic member 5240:Limiting column 5300: Holding mechanism 5310:Retaining element 5311: Drive unit 5311a: Rotating bump 5312: Transmission 5312a: horizontal bar 5312b: snap-fit ​​end 5320: Third reset element 5321: first elastic member 5400: storage cup 5410:Connecting column 5420: Cup connection convex 6000: Angle adjustment mechanism 6100: Fifth reset element 6110: Third elastic member 6200: Second operating member 6210: Rotating part 6220: Sliding part 6221: Bottom 7100: First pivot 7200: Second pivot 7300: Third Pivot 7400: gear pin 300: Seat belts S: Extension surface L: Left R: Right F:Front B: After

Claims

1. A child safety seat, comprising: seat belt; The backrest body has multiple positioning slots and a rod for winding the seat belt; and a headrest portion movably disposed on the backrest body, the headrest portion including a headrest body and a headrest adjustment mechanism; wherein, the headrest adjustment mechanism includes: a slider connected to the headrest body and slidably disposed on the backrest body, the slider having a housing and a sliding groove; and a headrest engaging member, which passes through the sliding groove and is capable of sliding along the sliding groove between a headrest locked position and a headrest unlocked position. When the headrest engaging member is in the headrest locked position, the headrest engaging member engages with one of the multiple positioning slots to restrict the sliding of the slider relative to the backrest body; when the headrest engaging member switches to the headrest unlocked position, the headrest engaging member disengages from the multiple positioning slots to allow the sliding of the slider relative to the backrest body. The headrest body is provided with a seat belt opening, and at least a portion of the housing is located above the seat belt opening; the line connecting the bar and the seat belt opening passes through the housing so that the seat belt disposed between the bar and the seat belt opening can press against the housing.

2. The child safety seat as claimed in claim 1, wherein an extension of the rear surface of the housing passes through the rod such that the seat belt located on the front side of the rod abuts against the slide member, while the seat belt located on the rear side of the rod is spaced apart from the slide member.

3. The child safety seat as claimed in claim 1, wherein the lower end of the rear surface of the housing has a guide surface for guiding the seat belt, the guide surface being an inclined surface or a convex cylindrical surface.

4. The child safety seat as claimed in any one of claims 1 to 3, wherein the backrest body is provided with a sliding groove that extends longitudinally along the backrest body and penetrates the surface of the backrest body, the slider is slidably engaged with the sliding groove such that at least a portion of the housing passes through the sliding groove, and the rod is located above the sliding groove.

5. The child safety seat as claimed in claim 4, wherein the backrest body is provided with a first mating portion, the extending direction of the first mating portion being parallel to the extending direction of the sliding groove, and the sliding member is provided with a second mating portion, wherein, One of the first mating part and the second mating part is a groove, and the other of the first mating part and the second mating part is a rib. The first mating part and the second mating part are in a concave-convex fit.

6. The child safety seat as claimed in any one of claims 1 to 3, wherein the backrest body is provided with a plurality of shift ribs, each of the shift slots being formed simultaneously in the plurality of shift ribs, the opening direction of the plurality of shift slots being opposite to the headrest body, each of the shift slots having a downwardly inclined slope, the end of the inclined slope having a stop protrusion for preventing the headrest engagement member from sliding off the inclined slope.

7. The child safety seat as claimed in any one of claims 1 to 3, wherein the pole includes a pole body and a swivel sleeve rotatably fitted on the pole body, and the seat belt is adapted to be wrapped around the swivel sleeve.

8. The child safety seat as claimed in any one of claims 1 to 3, wherein the sliding member has a first receiving groove communicating with the sliding groove, one end of the first receiving groove being an open end, the other end of the first receiving groove being formed as a limiting end, and at least a portion of the headrest drive member being slidably disposed in the first receiving groove and adapted to be stopped by the limiting end.

9. The child safety seat as claimed in claim 1, wherein the headrest adjustment mechanism further includes a headrest drive member movably connected to the headrest portion and drivenly connected to the headrest engaging member; the headrest engaging member includes a headrest engaging rod, the headrest engaging rod extending at least partially out of the sliding member; the headrest drive member is provided with a drive groove, the angle between the extending direction of the sliding groove and the extending direction of the drive groove forming an acute angle; the headrest engaging rod passes through the sliding groove and the drive groove, and is slidable along the extending directions of the sliding groove and the drive groove.

10. The child safety seat as claimed in claim 9, wherein the headrest adjustment mechanism further includes a reset member disposed between the sliding member and the headrest drive member, the reset member being adapted to bias the headrest drive member to drive the headrest engagement lever to move toward the headrest locking position.

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