TWIST LOCK INDICATOR MECHANISM AND CHILD SEAT

Abstract

The present disclosure provides a child safety seat. The child safety seat includes: a base; a seat rotatably disposed on the base and having a forward-facing state and a rearward-facing state with respect to the base; and an anti-tamper mechanism including a restricting groove disposed on the seat and a locking member disposed on the base, wherein the locking member engages with the restricting groove to prevent the seat from rotating from the rearward-facing state to the forward-facing state, and wherein the locking member includes two restricting structures. The child safety seat provided by the present disclosure can prevent the seat from being incorrectly rotated and has high safety.

Description

TECHNICAL FIELDThe present disclosure relates to the field of children's products, and more particularly to a rotary lock indicator mechanism and a child seat.BACKGROUNDChild seats are a type of seat that has been specially designed for children. The child seat may be mounted on a vehicle so that the children may sit thereon and be restrained by the child seat to secure safety thereof.The existing child seat typically includes a base and a seat mounted on the base, and an ISOFIX interface is mounted directly on one side of the base. A support foot may additionally be attached to the base to ensure a more stable fixation. To accommodate children of different ages, the seat may be rotated relative to the base so that it can be placed in a forward and rearward position. Generally, the forward position is suitable for older children, while the rearward position is suitable for more recent children.The forward condition is hazardous to young children. However, the existing child seats do not provide a practical anti-abuse mechanism to prevent the seat from being inadvertently rotated from the rearward position to the forward position. Therefore, it is necessary to provide a child seat that can prevent the unintentional turning conveniently and reliably.As attention has been paid to safety of children on travel, the child seat has become an indispensable auxiliary for children. In order to be adapted to children of different age or size, the seat has two states of use, namely a forward state and a rearward state. In general, the child seat can be switched between the forward state and the rearward state by rotating. However, in the existing child seats having a front-rear rotation function, there is no corresponding instruction when the seat is rotated to the front-rear state, i.e., when the user rotates the child seat to switch to the corresponding use state, it is impossible to clearly recognize whether the seat is rotated and locked, which interferes with the user experience and reduces the safety of use. For example, if the user does not know whether the seat is clipped (i.e., the seat cannot be rotated when clipped), there is a risk that the child seat may be inadvertently rotated during travel because the seat is not clipped.Therefore, there is an urgent need for a twist lock display mechanism in which the user can recognize whether the child seat is twisted and locked.ABORTAccording to some embodiments, the child seats include: a base; a seat rotatably disposed on the base and having a forward state and a rearward state with respect to the base; and a tamperproof mechanism including a limiting groove disposed on the seat and a locking member disposed on the base, wherein the locking member is engaged with the limiting groove to prevent the seat from rotating from the rearward state to the forward state, and wherein the locking member includes a limiting structure for limiting movement of the locking member with respect to the seat.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include the anti-abuse mechanism including two of the locking members and two actuation members corresponding to the two locking members, respectively, the two locking members being symmetrically arranged.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include one of the two actuators being actuated to prevent a corresponding latch member from engaging the limiting groove, whereby the seat may be rotated in one direction from the rearward facing state to the forward facing state.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include a pivot base, wherein the pivot base is annularly formed and includes the boundary groove, two inclined guide surfaces, and an escape groove, wherein the two inclined guide surfaces are disposed on both sides of the boundary groove, and both ends of the escape groove are connected to the outer sides of the two inclined guide surfaces, respectively.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include one end of the locking member being provided with a limiting straight surface and an inclined surface, wherein the locking member engages the limiting groove through the limiting straight surface to prevent the seat from rotating from the rearward facing state to the forward facing state, and wherein the inclined surface cooperates with one of the two inclined guide surfaces to guide the locking member into the limiting groove during rotation of the seat from the rearward facing state to the forward facing state.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include having on each of the two sides of the seat a rotational actuator that is actuated to rotate the seat relative to the base.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include the delimiting structure including a first delimiting structure and a second delimiting structure, wherein the first delimiting structure includes a first delimiting hole and a first delimiting element and the second delimiting structure includes a second delimiting hole and a second delimiting element.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include the first limiting member and the second limiting member passing through the first limiting hole and the second limiting hole, respectively, and being secured to the base such that the locking member may only move in one direction.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include a reset member, wherein two ends of the reset member abut the first limiting hole and the first limiting member, respectively, to apply a constant compressive force to the locking member moving towards the rotational base.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include that the first limiting hole and the second limiting hole are both elongated holes and the extension directions of the first limiting hole and the second limiting hole coincide with the one direction and the first limiting member and the second limiting member are both screws.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include having on each of the two sides of the seat a rotational actuator that is actuated to rotate the seat relative to the base.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may further include a support foot and a slide member telescopically disposed on the base, the support foot pivotally connected to the slide member and extending or retracting along with the slide member; and a tension member configured to rotate the support foot from a deployed position to a deployed position to pull the support foot to move toward the base.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include the tension member being a flexible member.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include the flexible member being a steel wire, a rope, or a woven strap.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include a drive member that pivots together with the support foot, wherein the drive member is configured to roll up the tension member to pull the support foot toward the base.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include the driving member being disposed on the support foot and the driving member and the support foot forming an integral structure and forming part of the support foot; alternatively, the driving member and the support foot are separately formed and connected and fixed by a mounting structure.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include the drive member being disposed at an upper end of the support foot.In addition to one or more of the features described herein or as an alternative, further embodiments of the child seats may include the driving member being in the form of a bead and being provided with an arcuate portion that cooperates with the traction member; alternatively, the driving member is provided in the form of a roller; alternatively, the driving member is provided in the form of a column.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seat may include a first end of the tension member being connected to the base and a second end of the tension member being connected to one of the drive member or the upper end of the support foot.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include an inner top wall of the base being provided with a mounting pillar and the first end of the tension member being secured to the mounting pillar by a first fastener.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include a lift assist mechanism having a first end connected to the base and a second end connected to the support foot via the tension member.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include the lift amplification mechanism being a rhombic telescopic frame.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include a mounting frame disposed in the base and a first end of the lift assist mechanism connected to the mounting frame by a second fastener.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats further include the seat being rotatably disposed on the base and having at least a forward position and a rearward position, and the child seat having a first use mode in which the slider is extended and the support foot is deployed to form a ground support and a second use mode in which the slider is retracted and the support foot is folded toward a bottom of the base.According to an embodiment, the present disclosure provides a rotary lock indicator mechanism that indicates whether the seat of a child seat rotatable relative to a base is positioned. The rotary lock indicator mechanism is disposed on the seat of the child seat, connected to the rotary lock mechanism for locking the seat to the base, and includes an unlock operating member, an unlock pulling member, and a state indicator. The unlock operating member is slidably connected to the seat and is switchable between first and second positions. One end of the unlocking pull member is connected to the unlocking operation member, the other end of the unlocking pull member is connected to the rotary locking mechanism. The state indicator is disposed at least on the unlocking operation member to indicate a locking state of the seat with respect to the base. When the seat is locked to the base by the rotary lock mechanism, the unlocking operation member is in the first position under an action of the unlocking pull member, and the state indicator indicates a first state; and when the unlocking operation member is operated to switch from the first position to the second position, the unlocking operation member drives the unlocking pull member to release the locking of the seat, and the state indicator indicates a second state.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the unlock actuator being an unlock button and the unlock button being movable from the first position to the second position by being pressed in a substantially vertical direction.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include an unlocking elastic return member having one end connected to the seat and the other end connected to the unlocking actuation member, the unlocking elastic return member configured to provide a force to urge the unlocking actuation member to the second position, thereby tending to pull the unlocking pulling member away from the rotary lock mechanism.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the unlocking resilient return member being a tension spring.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include that when the seat is locked, a force applied by the unlocking resilient return member to the unlocking actuation member and thus to the unlocking pull member is less than the locking force generated by the rotary lock mechanism.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the status indicator including a first indicator element disposed on an outer surface of the unlock actuator. When the seat is locked to the base, the unlocking operation member is held in the first position by the unlocking pulling member, and the first display member is exposed.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the status indicator including a second indicator disposed on an outer surface of the seat. When the seat is locked to the base, the unlocking operating member shields the second indicator; and when the unlocking operating member is placed in the second position, the first indicator is shielded by the seat and the second indicator is exposed. The first display element and the second display element display different information.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include a fastener fixedly connected to the seat, the unlock actuator being slidably disposed on the fastener to slide between the first position and the second position relative to the seat.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the state indicator including a first indicator element, a second indicator element, a display window, and a display bar. The display bar is fixedly disposed on the fixing member, the first display member and the second display member are sequentially disposed on the display bar in the vertical direction, and the display window is disposed on the unlocking operation member. When the unlock operating member is in the first position, the display window releases the first display member; and when the unlock operating member is in the second position, the display window releases the second display member. The first display element and the second display element display different information.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the indicator strip being integrally formed with the fastener and the first indicator element and the second indicator element having different colors.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the unlock pull member being an unlock steel wire.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the rotary lock mechanism being disposed on the seat and capable of engaging a corresponding positioning hole on the base.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the positioning hole including a forward positioning hole and a rearward positioning hole. When the seat is in a forward state, the rotary lock mechanism is engaged with the forward positioning hole; and when the seat is in a rearward state, the rotary lock mechanism is engaged with the rearward positioning hole.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the rotary lock mechanism including a mounting structure, a locking member, and a tension member. The attachment structure is fixedly disposed on the seat, the attachment structure having an open end. The locking member is disposed in the attachment structure, wherein the locking member is capable of sliding in the attachment structure, and an end of the locking member is configured to extend from the open end of the attachment structure to engage with the positioning hole. One end of the tension member is connected to the other end of the lock member, and the other end of the tension member is connected to the unlock operation member of the rotational clamp indicating mechanism. When an end of the locking member extends out of the fixing structure and engages with the positioning hole, the unlocking operating member is in the first position under the action of the tension member, and when the unlocking operating member is operated to switch from the first position to the second position, the locking member is retracted into the fixing structure by the tension member.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the rotary lock mechanism also including an elastic return member disposed between the attachment structure and the lock member and continuously applying a force to drive an end of the lock member out of the attachment structure.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the tension member and the unlock tension member being integrated.According to some embodiments, a rotary lock indicator mechanism is provided for indicating whether a seat of a child seat rotatable relative to a base is positioned. The rotary lock indicator mechanism is disposed on the seat and connected to the rotary lock mechanism for locking the seat to the base and includes: an unlock operating member and unlock pulling member; and a state indicator. The unlock operating member is slidably connected to the seat and is switchable between first and second positions. One end of the unlocking pull member is connected to the unlocking operation member, the other end of the unlocking pull member is connected to the rotary locking mechanism. The state indicator is configured to indicate a rotational lock state of the seat with respect to the base. When the seat is locked to the base by the rotary lock mechanism, the unlocking operation member is in the first position and the state indicator is exposed; and when the unlocking operation member is operated to change from the first position to the second position, the unlocking operation member drives the unlocking pull member to release the locking of the seat, and the state indicator is shielded.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the status indicator including a first indicator and the first indicator being disposed on the unlock actuator and exposing when the seat is locked to the base. When the lock between the seat and the base is released, the first indicator is shielded by the seat together with the movement of the unlocking operation member.In addition to one or more of the features described herein, or as an alternative, further embodiments of the rotary lock indicator mechanism may include the status indicator further including a second indicator, and the second indicator being disposed on the seat or the unlock actuator and shielded by the unlock actuator when the seat is locked to the base. When the lock between the seat and the base is released, the second indicator is exposed along with the movement of the unlock operation member.According to some embodiments, child seats include a seat, a base, and a rotary lock indicator mechanism of any of the above embodiments. The seat is disposed on the base, and the rotary lock indicator mechanism is disposed on a side of the seat.In addition to one or more of the features described herein, or as an alternative, further embodiments of the child seats may include two rotary lock indicator mechanisms being provided and the two rotary lock indicator mechanisms being respectively disposed on two sides of the seat. The tension member of the rotary lock mechanism includes a first tension member and a second tension member. One end of the first tension member is connected to the unlocking member, and the other end of the first tension member is connected to one of the two rotational lock indicating mechanisms. One end of the second tension member is connected to the lock member, and the other end of the second tension member is connected to the other of the two rotational lock indicating mechanisms.BRIEF DESCRIPTION OF THE DRAWINGSVarious objects, features and advantages of the present disclosure will become more apparent when the following detailed description of preferred embodiments of the present disclosure is considered in conjunction with the accompanying drawings. The drawings are merely exemplary representations of the present disclosure and are not necessarily drawn to scale. In the drawings, the same reference numerals refer to the same or similar parts throughout: FIG. 1 is a perspective view of a child seat of the present disclosure; FIG. 2 is a rear perspective view of the child seat of the present disclosure; FIG. 3 is a partial perspective view of the child seat of the present disclosure; FIG. 4 is a perspective view of the child seat of the present disclosure in which a seat is in a turning operation from a rearward state to a forward state; FIG. 5 is a partial perspective view showing an internal structure of the child seat of the present disclosure, with the seat in a position of FIG. 4 ; FIG. 6 is a perspective view of the child seat of the present disclosure with the seat in the forward state; FIG. 7 is a partial perspective view showing the internal structure of the child seat of the present disclosure, with the seat in a position of FIG. 6 ; FIG. 8 is a partial perspective view showing the internal structure of the child seat of the present disclosure, wherein a locking member is engaged with a limiting groove; FIG. 9 is a partial perspective view showing the internal structure of the child seat of the present disclosure, wherein the locking member is not engaged with the limiting groove; FIG. 10 is a perspective view of the child seat in a forward state according to an embodiment of the present disclosure; FIG. 11 is a perspective view of the child seat in a rearward state according to an embodiment of the present disclosure; FIG. 12 is a perspective view of a base of the child seat according to an embodiment of the present disclosure, as viewed from a front side; FIG. 13 is a perspective view of the base of the child seat according to an embodiment of the present disclosure, as viewed from a rear side; FIG. 14 ashows a cross-sectional view of the child seat in the forward-facing state according to an embodiment of the present disclosure; FIG. 14b is an enlarged fragmentary view of a block A in FIG. 14a in which the rotary lock mechanism engages a forward positioning hole of the base; FIG. 14 cshows a view in which a locking element of the rotary locking mechanism is in a retracted state; FIG. 15 ashows a cross-sectional representation of the child seat in a rearward facing state according to an embodiment of the present disclosure; FIG. 15 bshows an enlarged partial view of a block B in FIG. 15 a, in which the rotary locking mechanism engages a rearward positioning hole of the base; FIG. 16 ashows a perspective view of the child seat according to an embodiment of the present disclosure, in which a top side of a seat is partially removed to show a lock mounting structure of the rotary lock mechanism; FIG. 16 bshows an enlarged partial view of a block C in FIG. 16 a; FIG. 16 cshows a perspective view of an inner structure of the latch attachment structure of FIG. 16 b; FIG. 16 d shows a perspective view of a tension element from FIG. 16 c; FIG. 17 ashows a partial perspective view of the child seat in a locked state with respect to the base according to an embodiment of the present disclosure; FIG. 17 bshows a cross-sectional representation along a line D-D in FIG. 17 a; FIG. 18 ashows a partial perspective view of the child seat in an unlocked state with respect to the base according to an embodiment of the present disclosure; FIG. 18 bshows a cross-sectional representation along a line E-E in FIG. 18 a; FIG. 19 is a perspective view of an unlocking operation member of the rotary lock display mechanism according to an embodiment of the present disclosure; FIG. 20 is a perspective view of a lower cover of the seat according to an embodiment of the present disclosure; FIG. 21 ashows a partial perspective view of the child seat in the locked state with respect to a base according to another embodiment of the present disclosure; FIG. 21 bshows a cross-sectional representation along a line F-F in FIG. 21 a; FIG. 22 ashows a partial perspective view of the child seat in the unlocked state with respect to the base according to another embodiment of the present disclosure; FIG. 22 bshows a cross-sectional representation along a line G-G in FIG. 22 a; FIG. 23 is a perspective view of the unlocking operation member of the rotary lock display mechanism according to another embodiment of the present disclosure; and FIG. 24 is a perspective view of a fastener of the rotary lock display mechanism according to another embodiment of the present disclosure.List of Reference Numerals:1 Child seat 10 Base 110 Anchor portion 120 Receiving hole 130 Rotating base 131 Limiting groove 132 Escape groove 133 Inclined guide surface 140 Upper base cover 20 Seat 210 Rotating operation member 50 Support foot 610 Knob 611 Drive shaft 612 Guide rib 620 Locking member 621 Protruding column 623 Inclined surface portion 6231 Straight limiting surface 6232 Inclined surface 624 First limiting hole 625 Second limiting hole 630 Restoring member 640 First limiting member 650 Second limiting member 1 a Child seat 100 a Seat 101 a Untere cover 102 a Dreh base 110 a Dreh locking mechanism 111 aLock member 112 a Zugelement member 1121 aFirst tension member 1122 aSecond tension member 1123 a Verbinder 113 a Elastisches restoring member 114 a Befestigungs structure 115 aScrew 120 a Dreh locking display mechanism 121 a Operation member 122 a Pulling member 1221 aFirst releasing pulling member 1222 aSecond releasing pulling member 123 a Entriegeln resilient restoring member 124 aState indicator 1241 aFirst indicator 1242 aSecond indicator 1243 aDisplay window 1244 aDisplay bar 125 a Befestigungs 126 aScrew 200 aBase 201 aPosition hole 2011 a Vorwärts positioning hole 2012 a Rückwärts positioning holeDETAILED DESCRIPTIONIn order to further illustrate the principle and structure of the present disclosure, the preferred embodiments of the present disclosure will be described in detail together with the accompanying drawings. However, the embodiments are for illustration and explanation purposes only and are not to be used to limit the scope of the present disclosure.The terminology used in the present disclosure is for describing particular embodiments only and is not intended to be limiting of the present disclosure. The singular forms "a," "an," and "the" used in the present disclosure and the appended claims also include the plural forms unless clearly stated otherwise. It will also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the listed items.The child seat and the various concepts and exemplary embodiments associated therewith will be described in more detail below. The seat of the child seat can be rotated between a rearward state, a lateral state, and a forward state for convenience of use. It is understood that various concepts introduced above and discussed in more detail below may be implemented in various ways. The examples of specific embodiments and applications are intended primarily for purposes of illustration to enable those skilled in the art to practice obvious embodiments and alternatives.The child seat may be placed on a seat of the vehicle and fastened by an anchor member to provide secure protection for children.FIG. 1 is a perspective view of a child seat of the present disclosure, and FIG. 2 is a rear perspective view of the child seat of the present disclosure.The child seat 1 of the present disclosure may include a base 10; a seat 20 rotatably disposed on the base 10 and having a forward state and a rearward state with respect to the base 10; an anti-abuse mechanism including a limiting groove 132 disposed on the seat 20; and a locking member 620 disposed on the base 10. The locking member 620 can be engaged with the limiting groove 132 to prevent the seat 10 from rotating from the rearward state to the forward state. The engagement of the locking member 620 with the limiting groove 132 is selective, and the locking member 620 can be operated to engage with the limiting groove 132 and be released again. This will be described in more detail below. The seat 10 can be rotated 360 degrees about the base 20.The child seat 1 may further include an anchor portion 110 disposed at the rear of the base 10 and extending rearward; and a support leg 50 disposed at the front of the base 10 and extending downward. A lower end of the support foot 50 may abut on the bottom of a passenger compartment. The anchoring section 110 can be, for example, a fastening device for an ISOFIX interface, which can have two rigid arms arranged on both sides. The support foot 50 forms a third attachment point for the child seat 1, thereby better preventing a tendency of the child seat 1 to tip over in the event of an impact. Optionally, the anchoring portion 110 may be a fixing device for other interfaces, for example, for the LATCH system (Lower Anchors and Ethers for Children) and the like, and the present disclosure is not limited thereto.In the present disclosure, the forward state refers to the seat 20 facing the front of the vehicle, and the rearward state refers to the seat 20 facing the rear of the vehicle. In other words, when a child sits on the seat 20 in the forward state, it looks toward the front of the vehicle, and when the child sits on the seat 20 in the rearward state, it looks toward the rear of the vehicle.The anti-abuse mechanism is configured to prevent the seat 20 from being inadvertently rotated from the rearward state to the forward state. The above-mentioned functions can be realized by executing at a specific position in the turning operation. In particular, there may be a threshold angle of rotation for the seat 20 to rotate from the rearward state to the forward state. The rotation threshold angle may be any angle within a range of 90° to 180°, for example, 100°, 110°, 120°, 130°, 140°, 150°, 160°, and 170°. When the seat 20 is rotated to the threshold rotation angle, the locking member 620 may extend into and engage with the limiting groove 132, so that the seat 20 cannot be rotated any further to the forward state. The locking member 620 can be actuated such that the locking member 620 is not extended into the limiting groove 132 when the seat 20 is rotated to the threshold angle of rotation. In this way, the seat 20 can be further rotated to the forward state. Alternatively, the threshold angle of rotation may also refer to multiple angles, e.g., two angles, three angles, and the like.When the seat 20 is in the rearward state, the seat 20 may be rotated clockwise or counter-clockwise to the forward state. The tamper evident mechanism may include two locking elements 620. The tamper evident mechanism may also include two actuators 610, each corresponding to two locking members 620. The two locking elements 620 can be arranged symmetrically. In particular, the two locking members 620 may be symmetrically disposed on both sides of the base 10 on the front side, but the present disclosure is not limited thereto.On both sides of the seat 20, a rotary actuator 210 may be provided. The rotational actuator 210 is configured to be actuated for rotation of the seat 20 with respect to the base 10. As shown in Fig. 1, on the front side of the seat, two rotary actuators 210 are symmetrically formed, which project upward and are provided with inwardly recessed recesses forming a handle-like shape. The two rotary actuators 210 are adapted for manual operation to rotate the seat 20 clockwise and counter-clockwise respectively with respect to the base 10.The base 10 may be provided with two receiving holes 120 at positions corresponding to the two locking members 620. The actuator 610 may be a button. In other embodiments, the actuator 610 may be a handle, a lever, or the like. The present disclosure does not limit the specific shape of the operation member 610.The two operating members 610 may be arranged to protrude from the outer surface of the base 10 through the two receiving holes 120, respectively, and may be operated to protrude from the outer surface of the base 10 by a small distance, or may be operated to be flush with the outer surface of the base 10.Alternatively, the two operating members 610 may be disposed flush with the outer surface of the base 10 and operated to be buried in the base 10.FIG. 3 is a partial perspective view of the child seat of the present disclosure, showing a structure below the seat 20.The seat 20 may include a rotating base 130. The rotation base 130 may be formed at a lower portion of the seat 20. The rotating base 130 may be generally ring-shaped, e.g., a circular ring. The rotation base 130 may include a limiting groove 131, two inclined guide surfaces 133, and an escape groove 132.The restricting groove 131 may be disposed at a position just in front of the seat 20, but the present disclosure is not limited thereto. The two inclined guide surfaces 133 may be disposed on both sides of the limiting groove 131. The both ends of the escape groove 132 are connected to the outer sides of the two inclined guide surfaces 133, respectively. That is, the escape grooves 132 are formed at all positions of the outer periphery of the rotating base 130 except for the two inclined guide surfaces 133 and the limiting grooves 131 so as to surround most of the outer periphery of the annular rotating base 130. The escape groove 132 is configured to bypass the locking member 620. Thus, when the seat 20 is rotated with respect to the base 10, the escape groove 132 does not block the movement of the locking member 620. Each of the inclined guide surfaces 133 is smoothly connected to the escape groove 132. Two side walls of the limiting groove 131 may protrude outward substantially perpendicularly to the outer circumferential surface of the rotating base 130. Each of the two inclined guide surfaces 133 extends from one end of the escape groove 132 in the direction of the limiting groove 131, so that a smooth transition structure is produced between the escape groove 132 and the limiting groove 131.FIG. 4 is a perspective view of the child seat of the present disclosure in which the seat is in the forward state in a turning operation from the rearward state, FIG. 5 is a partial perspective view showing an internal structure of the child seat of the present disclosure with the seat in a position of FIG. 4, FIG. 6 is a perspective view of the child seat of the present disclosure with the seat in the forward state, and FIG. 7 is a partial perspective view showing the internal structure of the child seat of the present disclosure with the seat in a position of FIG. 6.An end of the locking member 620 (i.e., an end facing the rotation base 130) is provided with an inclined surface portion 623, and the inclined surface portion 623 has a straight boundary surface 6231 and an inclined surface 6232 (see FIG. 9 ). The straight boundary surface 6231 may be formed as a recess on a side surface of the locking element 620. The inclined surface 6232 may be formed as an inclined surface connecting the side surface and an end surface of the locking member 620.When the locking member 620 engages with the limiting groove 131, the straight limiting surface 6231 may abut against a side surface of the limiting groove 131 to prevent the seat 20 from rotating with respect to the base 10. That is, the lock member 620 engages with the limiting groove 131 through the straight limiting surface 6231 to prevent the seat 20 from rotating from the rearward state to the forward state.During the rotation of the seat 20 from the rearward state to the forward state, when the operation member 610 is not operated, the inclined surface 6232 cooperates with the guide inclined surface 133, so that the seat 20 can be further rotated, and at the same time, the guide inclined surface 133 pushes the lock member 620 away from the rotation base 130 through the inclined surface 6232. That is, the inclined surface 6232 cooperates with one of the two inclined guide surfaces 133 to guide the locking member 620 into the limiting groove 131 during the rotation of the seat 20 from the rearward state to the forward state.The actuating element 610 is formed with a drive shaft 611. Preferably, two drive shafts 611 may be formed on the operating member 610, the two drive shafts 611 being arranged opposite each other with respect to a moving direction of the locking member 620 toward the rotating base 130, so that the movement of the operating member 610 is more stable. That is, a virtual connecting line formed by the two drive shafts 611 is perpendicular to a sliding direction of the locking member 620 toward the rotating base 130. One end of the locking member 620 (i.e., the end opposite to the rotating base 130) may be provided with a protruding column 621. The protruding column 621 protrudes transversely from both sides of the locking member 620 (i.e., in a direction perpendicular to the moving direction of the locking member 620 toward the rotating base 130), and is inserted into the drive shaft 611, so that the movement of the operating member 610 along one direction (e.g., in an up-and-down direction) causes the locking member 620 to move along another direction (in a direction close to the rotating base 130 or in a direction away from the rotating base 130, which may also be referred to as "a radial direction of the rotating base 130"). Specifically, when the operation member 610 is pressed downward, the locking member 620 moves in the direction away from the rotation base 130. The drive shaft 611 may be formed in an elongated shape so that the protruding column 621 can move in the drive shaft 611, and a length of the drive shaft 611 is substantially equal to a stroke length of the locking member 620 moving in a direction away from the rotation base 130. The operating member 610 may be arranged in the vertical direction and the locking member 620 may be arranged in the horizontal direction. The drive shaft 611 may be arranged to be inclined with respect to both the operating member 610 and the locking member 620. For example, the drive shaft 611 may be arranged to form an angle of 45° with both the actuation element 610 and the locking element 620. Alternatively, the drive shaft 611 may be provided to form an included angle of less than 45° (e.g., 30°) with respect to the actuator 610, or the drive shaft 611 may be provided to form an included angle of more than 45° (e.g., 60°) with respect to the actuator 610. The inclination angle of the drive shaft 611 is not limited by the present disclosure.A guide rib 612 may be formed on the actuating element 610 or the locking element 620. The guide rib 612 may be formed as a rectilinear rib protruding from a side portion of the operating member 610 and the locking member 620. That is, a direction in which the guide rib 612 protrudes outward is a direction perpendicular to a direction in which the operation member moves. Preferably, in this embodiment, two guide ribs 612 may be formed on the operating member 610 and the locking member 620, so that the movement of the operating member 610 is more stable. The guide rib 612 may be disposed above the drive shaft 611 and may extend vertically. The guide rib 612 is configured to cooperate with a corresponding structure on the base 10 to define the actuator 610 to move only in the vertical direction.A plurality of holes may be formed on the actuator 610 to reduce the weight of the actuator 610 and the amount of materials used to manufacture the actuator 610.FIG. 8 is a partial perspective view showing the inner structure of the child seat of the present disclosure with the locking member engaged in the limiting groove, and FIG. 9 is a partial perspective view showing the inner structure of the child seat of the present disclosure with the locking member not engaged in the limiting groove.The locking element 620 includes a limiting structure. In particular, the locking element 620 may include two delimiting structures, and the two delimiting structures may include a first delimiting structure and a second delimiting structure. The first limiting structure may include a first limiting hole 624 and a first limiting member 640, and the second limiting structure may include a second limiting hole 625 and a second limiting member 650.The first restricting hole 624 and the second restricting hole 625 are each formed in an elongated shape along a radial direction of the rotating base 130. The first limiting hole 624 may be closer to the rotation base 130 than the second limiting hole 625. The first restricting member 640 and the second restricting member 650 may be passed through the first restricting hole 624 and the second restricting hole 625, respectively, and fixed to the base 10 so that the locking member 620 may move only along the radial direction of the rotating base 130. That is, an axis of the first restricting member 640 and the second restricting member 650 is approximately perpendicular to a surface of the restricting groove of the rotating base 130. Similarly, a direction in which the first restricting hole 624 and the second restricting hole 625 extend is generally perpendicular to the surface of the restricting groove of the rotating base 130.The child seat 1 may further include a restoring member 630. The both ends of the return member 630 can abut against the first limiting hole 624 and the first limiting member 640, respectively, so that a constant pressing force is applied to the locking member 620, which moves toward the rotating base 130. The restoring member 630 may be disposed in the first restricting hole 624. The first limiting hole 624 may have a sufficient length to receive the reset member 630. The restoring element 630 may be a helical spring. Alternatively, the restoring element 630 may also be another component which can generate a restoring force. Alternatively, the both ends of the reset member 630 may abut on the second restricting hole 625 and the second restricting member 650, respectively. The first limiting member 640 and the second limiting member 650 may be screws. Alternatively, the first limiting member 640 and the second limiting member 650 may be another component that may be fixed to the base 10 and may extend into the first limiting hole 624 and the second limiting hole 625, respectively.When the seat 20 is rotated from the rearward state to the forward state, the locking member 620 moves along the escape groove 132. The escape groove 132 does not block the movement of the locking element 620. When the seat 20 is rotated to a position where the locking member 620 comes into contact with the inclined guide surface 133, the inclined guide surface 133 presses the locking member 620 in the radial direction of the rotation base 130 and in the direction away from the rotation base 130 by the inclined surface 6232. Since the first restricting member 640 and the second restricting member 650 restrict the first restricting hole 624 and the second restricting hole 625, the locking member 620 can only move accurately along the radial direction of the rotating base 130. In addition, since the first restricting member 640 and the second restricting member 650 are restricted to two positions, the locking member 620 does not swing or rotate itself during the movement. This allows the locking element 620 to be extended and retracted smoothly and thus an excellent running quality. Since the locking member 620 is pushed away from the rotating base 130, the seat 20 can rotate further, and the locking member 620 is not blocked by a side wall of the limiting groove 131. When the seat 20 is rotated until the locking member 620 is aligned with the limiting groove 131, the restoring member 630 presses the locking member 620 into the limiting groove 131. At this time, the seat cannot rotate any further because the straight limiting surface 6231 abuts against the side wall of the limiting groove 131 (see FIG. 5 ). A warning sign is mounted on the actuating element 610. When the child seat is used for a child having a height of 0-105 cm or an age of less than 15 months, it is recommended to use the forward state, which may reminder or give notice to the operator to judge whether to press the operating member 610 downward, so that a warning effect is obtained and abuse is prevented. When the operating member 610 needs to be pressed downward, the downward movement of the operating member 610 is transmitted to the locking member 620 by the cooperation of the drive shaft 611 and the protruding column 621, so that the locking member 620 moves in the radial direction of the rotating base 130 and in the direction away from the rotating base 130 against the restoring force of the restoring member 630. That is, the operating member 610 causes the locking member 620 to leave the restricting groove 131. The operator may further press the operating member 610 downward and simultaneously rotate the seat 20 until the locking member 620 passes through the limiting groove 131, and then release the operating member 610. Finally, the seat 20 can be further rotated to the forward state.It is understood that the above-described operation may also take place during the rotation of the seat 20 from the forward-facing state to the rearward-facing state. Therefore, the child seat 1 of the present disclosure can also prevent the seat 20 from being rotated from the forward state to the rearward state by mistake.FIGS. 10 and 11 are perspective views of the child seat in various use states, respectively, and FIGS. 12 and 13 are perspective views of the base of the child seat from the front side and from the rear side, respectively.As illustrated in FIGS. 10 and 11, an embodiment of the present disclosure provides a child seat 1 awith a seat 100 aand a base 200 a, the seat 100 abeing disposed on the base 200 a. The child seat 1 ahas two use states: a forward state (see FIG. 10 ), i.e., it is disposed in a direction in which the vehicle moves forward; and a rearward state (see FIG. 11 ), i.e., it is disposed opposite to the traveling direction of the vehicle. The child seat 1 aof the present disclosure is switched between the forward state and the rearward state by rotating the seat 100 awith respect to the base 200 a.Specifically, the child seat 1 aof the present disclosure includes a rotary lock mechanism 110 a. The rotary lock mechanism 110 ais disposed on the seat 200 a, for example, directly behind the bottom of the seat 200 a, and is engageable with a positioning hole 201 acorrespondingly disposed on the base 200 ato realize the locking of the seat 100 awith respect to the base 200 awhen the child seat 1 ais rotated to a corresponding use state.As illustrated in FIGS. 12 and 13, the positioning hole 201 aincludes a forward positioning hole 2011 aand a rearward positioning hole 2012 a, and the forward positioning hole 2011 aand the rearward positioning hole 2012 amay be respectively disposed on a center line of the base 200 ain a transverse direction. When the seat 100 ais in the forward state, the rotary lock mechanism 110 ais engaged with the forward positioning hole 2011 a; and when the seat 100 is in the rearward state, the rotary lock mechanism 110 ais engaged with the rearward positioning hole 2012 a.FIGS. 14 aand 14 b show the rotary lock mechanism when the child seat is in the forward state, FIGS. 15 aand 15 b show the rotary lock mechanism when the child seat is in the rearward state, and FIGS. 16 ato 16 d show a fixing structure and its internal structure, respectively.In an embodiment, as shown in FIG. 14 b, the rotary locking mechanism 110 aincludes a locking member 111 a, a tension member 112 a, and a fastening structure 114 a. The fixing structure 114a is fixedly disposed on the seat 100a, and one end of the fixing structure 114a is open. For example, as illustrated in FIG. 16 a, the fixing structure 114 amay be fixedly disposed in the rotating base 102 aof the seat 100 aby screws 115 alocated on both sides of the fixing structure 114 ato rotate with the seat 100 awith respect to the base 200 a, and the open end thereof is brought together with the forward positioning hole 2011 aor the rearward positioning hole 2012 a. In an embodiment, the rotating base 102 amay slide with respect to other parts of the seat 100 ato adjust an inclination angle of the seat. Moreover, in other embodiments, e.g., in an embodiment without the pivot base 102 a, the attachment structure 114 amay also be directly attached in the seat 100 a.As illustrated in FIGS. 14 band 15 b, the locking member 111 ais disposed in the fixing structure 114 aand is slidable in the fixing structure 114 a, so that one end of the locking member 111 acan extend out of the open end of the fixing structure 114 a, thereby engaging with the forward positioning hole 2011 aor the rearward positioning hole 2012 a. One end of the tension member 112 ais connected to the other end of the locking member 111 a, and the other end of the tension member 112 ais connected to an unlocking device (for example, an unlocking operation member 121 adescribed in detail below). The tension member 112 amay be, for example, a steel wire, but the present disclosure is not limited thereto.In an embodiment, an unlocking device (e.g., an unlocking operating member 121 a) may be disposed on each of both sides of the child seat 1 a, respectively, and the tension member 112 aof the rotary locking mechanism 110 amay include a first tension member 1121 aand a second tension member 1122 a. As shown in FIG. 16 d, one end of the first tension member 1121 aand one end of the second tension member 1122 aare connected to each other by a connector 1123 a(e.g., a steel wire head), and then connected to the locking member 111 athrough the connector 1123 a, so that when an unlocking device is operated on both sides of the child seat 1 a, the locking member 111 acan be driven to realize synchronous adjustment.Moreover, as illustrated in FIGS. 14 b, 15 band 16 c, the rotary lock mechanism 110 amay further include an elastic restoring member 113 adisposed between the fixing structure 114 aand the locking member 111 aand continuously providing a force to drive an end of the locking member 111 aout of the fixing structure 114 asuch that the locking member 111 ais always inserted into the positioning hole 201 ato realize engagement when the seat 100 ais rotated to its position (i.e., to a position for forward or rearward use) and the unlocking device is not operated. The elastic restoring member 113 amay be, for example, a compression spring, but the present disclosure is not limited thereto.When the child seat 1 awith the above structure is in the forward state, one end of the locking member 111 aextends out of the fixing structure 114 aunder the action of the elastic restoring member 113 a, and then extends out of a housing of the seat 100 ato engage with the forward positioning hole 2011 aof the base 200 a, so that the seat 100 ais locked to the base 200 aand is no longer rotated; When there is a need to change the child seat 1 afrom the forward state to the rearward state, the tension member 112 ais driven by the operation of the unlocking device, and then the protruding end of the locking member 112 ais retracted into the attachment structure 114 aby a tension force of the tension member 112 a, so that the seat 100 acan be rotated to the rearward state with respect to the base 200 a. During the rotation, due to the position limitation of the inner housing of the base 200a on the locking member 111a, the locking member 111a is always kept in the retracted state until it reaches the position of the rearward positioning hole 2012a, and under the action of the elastic restoring member 113a, the locking member 111a extends out of the mounting structure 114a to engage with the rearward positioning hole 2012a, thereby locking the seat 100a in the rearward use position. Moreover, in other embodiments, after the operation of the unlocking device and during the rotation of the seat 100 awith respect to the base 200 a, the locking member 111 amay be held in the retracted state by other means (e.g., providing a retaining mechanism for the unlocking device, a retaining mechanism for the locking member, and cooperation between the unlocking device and the elastic member disposed on the locking member, etc.) such that the locking member 111 adoes not extend to a sufficient depth for engagement with the positioning hole 201 aof the base 200 a, as shown in FIG. 14 c.In order to present the locked state of the seat 100 awith respect to the base 200 a, the child seat of the present disclosure further includes a rotary lock display mechanism 120 a.FIGS. 17 ato 20 show a rotary lock display mechanism according to an embodiment of the present disclosure.In an embodiment of the present disclosure, as shown in FIGS. 17 ato 20, the rotary lock indicator mechanism 120 ais disposed on the seat 100 aof the child seat and connected to the rotary lock mechanism 110 afor locking the seat 100 ato the base 200 ato indicate whether the seat 100 ais in position with respect to the base 200 a. For example, the rotary lock display mechanism 120 amay be disposed at the front of the seat 100 a, at both sides of the front part of the seat 100 a, or at the armrests on both sides of the seat 100 a, and the present disclosure is not limited thereto. Preferably, two rotary lock indicator mechanisms 120a are provided disposed on both sides of the seat 100a.Specifically, the rotary lock display mechanism 120 aincludes an unlocking operation member 121 a, an unlocking pulling member 122 a, a locking groove, and a state display 124 a. The unlocking operating member 121 ais slidably connected to the seat 100 aand is configured to be switched between a first position (see FIG. 17 b ) and a second position (see FIG. 18 b ) for releasing the locking of the seat 100 awith respect to the base 200 a. Preferably, the unlocking operating member 121 amay be an unlocking button arranged in a reverse manner on either side of the seat 100 aand movable from the first position to the second position by being pressed in a substantially vertical direction, wherein the first position means that the unlocking button is in a lower position and the second position means that the unlocking button is pressed upward and is in an upper position.In other embodiments, the unlocking operating member may also be disposed on the seat and move in the front-rear or left-right direction with respect to the seat, or the unlocking operating member may also be disposed on the base.One end of the unlocking pull member 122 ais connected to the unlocking operation member 121 a, while the other end of the unlocking pull member 122 ais connected to the rotary locking mechanism 110 a, specifically, to the locking member 111 aof the rotary locking mechanism 110 a. The unlocking tension member 122 amay be, for example, an unlocking steel wire, but the present disclosure is not limited thereto. In the illustrated embodiment, the tension member 122 aof the unlocking mechanism and the tension member 112 aof the rotary locking mechanism 110 aare integrated.In an embodiment, the state indicator 124 ais disposed at least on the unlocking operation member 121 ato indicate the rotational locking state of the seat 100 awith respect to the base 200 a. When the seat 100 ais locked to the base 200 aby the rotary lock mechanism 110 a, the unlocking operation member 121 ais in the first position under the action of the unlocking pull member 122 a, and the state indicator 124 adisplays a first state; and when the unlocking operation member 121 ais operated to switch from the first position to the second position, the unlocking operation member 121 adrives the unlocking pull member 122 ato unlock the seat 100 a, and the state indicator 124 adisplays a second state.In one example, the state indicator 124 aincludes a first indicator element 1241 a. As illustrated in FIGS. 17 aand 19, the first display member 1241 ais provided on an outer surface of the unlocking operation member 121 a. When the seat 100 ais locked to the base 200 a, the unlocking operation member 121 ais held in the first position by the unlocking pulling member 122 a, and the first display member 1241 ais exposed as illustrated in FIG. 17 a.For example, when the unlocking operation member 121 ais an unlocking button, the first display member 1241 amay be disposed at an upper edge of the unlocking button corresponding to a pressing direction of the unlocking button, i.e., as long as the first display member 1241 amay be exposed when the seat 100 ais locked to the base 200 a. In another example, the unlocking button is disposed in an opening on the housing of the seat 100 a(e.g., the lower cover 101 a), and a receiving portion for installing the unlocking button and receiving the pushed unlocking button is also disposed on the housing of the seat 100 a. The first indicator 1241 ais disposed on the unlocking knob in the vicinity of the position where the unlocking knob is connected to and cooperates with the housing of the seat 100 a(i.e., on the unlocking knob and near the receiving portion of the housing of the seat 100 a). When the unlocking button is pressed, the unlocking button is at least partially pressed into the receiving portion, so that the first display member 1241 ais subsequently pressed into the receiving portion to be shielded from the housing of the seat.Moreover, the first display member 1241 amay be a protrusion or a recess provided on the outer surface of the unlocking operation member 121 a, may be formed integrally with the unlocking operation member 121 a, or may be configured to match a shape of an opening of the lower cover 101 aof the seat 100 a. The first indicator 1241 amay also be green pad printing or may be of another color and shape, and the present disclosure is not limited thereto.Moreover, the state indicator 124 amay further include a second indicator 1242 a. As illustrated in FIGS. 17 band 20, the second indicator 1242 ais provided on the outer surface of the seat 100 a(e.g., the lower cover 101 a), and may also be provided on the outer surface of the unlocking operation member. When the seat 100a is locked to the base 200a, the first indicator 1241a is exposed but the second indicator 1242a is shielded by the unlocking operation member 121a; and when the unlocking operation member 121a is operated to the second position, the first indicator 1241a is shielded by the seat 100a and the second indicator 1242a is exposed as shown in Fig. 18a.For example, when the unlocking operation member 121 ais an unlocking button, the second display member 1242 amay be provided at the lower edge of the unlocking button corresponding to the pressing direction of the unlocking button or at a position corresponding to the unlocking button on the lower cover 101 aof the seat 100 a, for example, at a lower inner surface of the opening (for accommodating the unlocking button) of the lower cover 101 a.Moreover, the second display element 1242 amay be a protrusion or a recess provided on the outer surface of the lower cover 101 a, may be formed integrally with the lower cover 101 a, or may be configured to match a shape of the lower cover. The first indicator 1241 amay also be green pad printing or may have other colors and shapes, and the present disclosure is not limited thereto.When the state display 124 aincludes both the first display element 1241 aand the second display element 1242 a, the first display element 1241 aand the second display element 1242 amay display different display information, for example, different colors. For example, if the first indicator 1241 ais a green pad print to show that the seat 100 ais locked to the base 200 a, the second indicator 1242 amay have a color that is significantly different from that of the first indicator 1241 a, such as a red pad print, to reminder the user of the change of state.In another embodiment, the state indicator 124 amay be attached to only the seat 100 a(e.g., the bottom cover 101 a). For example, the state indicator 124 amay include only a second indicator 1242 aprovided on the bottom cover 101 a, and the second indicator 1242 ais shielded when the seat 100 ais locked to the base 200 a; and the second indicator 1242 ais exposed when the locking between the seat 100 aand the base 200 ais released to indicate to the user the current state of the child seat.That is, the state indicator 124 aof the present disclosure may be mounted on at least one of the unlocking operation member 121 aand the seat 100 a(e.g., the lower cover 102 a).Moreover, as illustrated in FIGS. 17 band 18 b, the rotary lock display mechanism 120 aincludes also an unlocking elastic restoring member 123 a. One end of the unlocking elastic return member 123 ais connected to the seat 100 a, and the other end of the unlocking elastic return member 123 ais connected to the unlocking operation member 121 ato provide a force for driving the unlocking operation member 121 ato the second position, whereby the unlocking pulling member 122 apreferably tends to be pulled away from the rotary locking mechanism 110 a, i.e., the locking member 111 aof the rotary locking mechanism 110 ais pulled. The force applied from the unlocking elastic restoring element 123 ato the unlocking operating element 121 aand thus to the unlocking pulling element 122 ais smaller than the locking force provided from the rotary locking mechanism 110 a(i.e. the locking element 111 a), that is to say the force applied from the unlocking elastic restoring element 123 ato the unlocking operating element 121 aand thus to the unlocking pulling element 122 ais smaller than a force of the rotary locking mechanism 110 ato pull the unlocking pulling element 122 a, since one of the locking elements 111 ais held protruding from the fastening structure 114 aunder the action of the elastic restoring element 113 awhen the child seat 1 ais in the forward or rearward directed state. The unlocking elastic return member 123 ais, for example, a tension spring, one end of which is fixedly disposed on the unlocking operation member 121 aby a bolt (i.e., the end can move with the unlocking operation member 121 a), and the other end of which is fixedly (i.e., immovable) with respect to the seat 100 a.For better understanding, in the following description, the unlocking operation member 121 ais taken as an unlocking button and the unlocking elastic return member 123 is taken as a tension spring as an example. Referring to Figures 14b, 17a, 17b and 19, the unlock button is disposed upside down on the seat 100a. When the seat 100 ais locked to the base 200 a, the locking member 111 aof the rotary lock mechanism 110 ais inserted into the forward positioning hole 2011 a(or the rearward positioning hole 2012 a) under the action of the elastic restoring member 113 a, and the unlocking pulling member 122 ais pulled to limit the unlocking button downward to the first position (i.e., the unlocking button is at the lower position). Since the tension spring tension force is less than that of the release tension member 122a, the tension spring is stretched, and at this time, the release button is in the lower position to shield the second indicator 1242a and expose the first indicator 1241a disposed at the upper part of the outer surface of the release button, thereby indicating that the seat 100a has been locked to the base 200a. When there is a need to rotate the seat 100 a, the unlocking button is pressed to move upward with respect to the lower cover 101 a, and the unlocking pulling member 122 ais pulled upward to pull out the locking member 111 afrom the forward positioning hole 2011 a(or the rearward positioning hole 2012 a). When the seat 100a is rotated away from the forward use position or the rearward use position with respect to the base 200a, the lock member 111a at the other end of the unlock drawing member 122a is held by the inner surface of the base 200a and held in the retracted state; at the same time, when the unlock button is released, since the pulling force of the tension spring is larger than that of the unlock drawing member 122a, the unlock button moves to the second position (which is at the upper position) under a contracting force of the tension spring, and the unlock button can be positioned to the second position. In this state, the first indicator 1241 adisposed on the outer surface of the unlocking button is shielded, for example, hidden in the lower cover 101 a, while the second indicator 1242 alocated on the lower cover 101 ais exposed, thereby indicating that the seat 100 ais unlocked to rotate with respect to the base 200 a. Therefore, the rotary lock display mechanism 120 aof the present disclosure can superimpose and superimpose the two display elements by the up and down movement of the unlocking button to indicate whether the seat 100 ais locked to the base 200 a. Of course, as described above, only one of the first display element 1241 aand the second display element 1242 amay be provided. For example, when only the first indicator 1241 ais disposed on the outer surface of the unlocking button, a state in which the first indicator 1241 ais exposed means that the seat is locked to the base, while a state in which the first indicator 1241 ais locked means that the locking of the seat is released.Moreover, as illustrated in FIGS. 17 band 18 b, the rotary lock indicator mechanism 120 amay further include a fastening member 125 athat is fixedly connected to the seat 100 a, for example, by a screw 126 a, and the unlocking operation member 121 ais slidably disposed on the fastening member 125 ato slide between the first position and the second position with respect to the seat 100 a.FIGS. 21 ato 24 show a rotary lock display mechanism according to another embodiment of the present disclosure.In another embodiment of the present disclosure, the state indicator may include a display window and a display member disposed at a rear side of the display window, one of the display window and the display member being fixedly disposed on the seat 100 a, and the other of the display window and the display member being disposed on the unlocking operation member 121 asuch as the unlocking button. For example, as shown in FIGS. 21a to 24, the state display 124a includes a first display element 1241a, a second display element 1242a, a display window 1243a, and a display bar 1244a, and the first display element 1241a, the second display element 1242a, and the display bar 1244a constitute the display element as described above. The display strip 1244 ais arranged fixedly on the seat 100 aby means of screwing, welding, adhesive bonding and the like or can also be arranged fixedly on the fastening element 125 awhich is fixedly connected to the seat 100 a. As shown, the display bar 1244a is integrally formed with the seat 100a (or the fastener 125a). The first display member 1241 aand the second display member 1242 aare disposed on the display bar 1244 aalong the moving direction (e.g., vertical direction) of the unlocking operation member 121 a, and the display window 1243 ais disposed on the unlocking operation member 121 a. In this embodiment, the display bar 1244 ais inserted into the unlocking operation member 121 a, and the unlocking operation member 121 acan move with respect to the fixing member 125 aand further with respect to the display bar 1244 a. When the unlocking operation member 121 ais in the first position, the display window 1243 aopens the first display member 1241 a; and when the unlocking operation member 121 ais moved to the second position, the display window 1243 aopens the second display member 1242 a, and the first display member 1241 aand the second display member 1242 adisplay different display information. For example, the first indicator 1241 ais shown in green and the second indicator 1242 ais shown in red to indicate different states of the seat 100 a.For better understanding, the unlocking operating element 121 ais taken again as an example in the following description. When the seat 100 ais locked to the base 200 a, the unlocking operation member 121 a(unlocking button) is in the first position (i.e., the unlocking button is in the lower position), and the display window 1243 aon the unlocking operation member 121 adisplays the first display member 1241 a(which is above the second display member 1242 a) on the display bar 1244 a; When the unlocking operation member 121 a(unlocking button) is in the second position (i.e., the unlocking button is in the upper position), the display window 1243 aon the unlocking operation member 121 adisplays the second display member 1242 aon the display bar 1244 a, so that the display members having different information (e.g., different colors) can be realized by changing the position of the unlocking button in the up and down direction, thereby displaying the state of the seat 100 awith respect to the base 200 a.By the rotary lock display mechanism 120 aof the present disclosure, the user can intuitively and unambiguously recognize whether the seat 100 aof the child seat is positioned in place and locked to the base 200 afrom the outside of the seat 100 ato determine whether the child seat is used safely, thereby providing better user experience and improving the safety of use. Moreover, the state indicator 124 ais disposed at least on the unlocking operation member 121 aand indicates various states, thereby simplifying the overall structure of the seat 100 a, reducing production and processing costs, optimizing the assembly process, and facilitating the operation.According to some embodiments, the present disclosure provides a rotary lock display mechanism that can display a rotary lock state of a child seat.According to some embodiments, the present disclosure provides a rotary lock display mechanism having a simple structure, convenience of operation, and high safety of use.According to some embodiments, the present disclosure provides a child seat that allows the user to clearly recognize whether the child seat is rotated to its position.The present disclosure has at least one of the following advantages:The child seat of the present disclosure can prevent the seat from being rotated incorrectly. In particular, the child seat of the present disclosure requires additional operation to allow the seat to be rotated from the rearward state to the forward state, and does not block the normal rotation of the seat from the forward state to the rearward state. The additional operation can be conveniently performed from both sides of the child seat. The structure of the anti-abuse mechanism of the child seat is simple and has good reliability, and the locking member of the anti-abuse mechanism has high running quality and is not prone to errors.In the present disclosure, the support foot is provided to have at least one deployed position and one deployed position, so that when the child seat is used for the vehicle, the child seat is well supported by the support foot to prevent the child seat from tilting; and when not in use, the support foot may be deployed at the bottom of the base to facilitate storage, and at the same time, the volume of the child seat may be reduced to reduce the transport cost. Moreover, the provision of a slide member telescopically disposed on the base and the pivoting of the support foot on the slide member to be extended and retracted with the slide member not only facilitates the installation of the support foot but also can well pivot and be extended or retracted with the extension or retraction of the slide member, so that when the support foot is not used, the slide member can be retracted toward the bottom of the base to reduce the length of the slide member protruding from the front end of the base or to prevent the slide member from protruding from the base, thereby not interfering with the feet of the child, improving the riding feeling of the child, further reducing the volume of the child seat, and thus reducing the transportation cost. Further, a tension member is provided which is tensioned when the support foot is pivoted and folded to form an inward reaction force so that the support foot can be retracted inward synchronously, i.e., in a direction close to the base, and the user does not need to press the support foot to retract after folding, thereby achieving full folding, which simplifies the operation of the user, makes the operation simple and convenient, provides good user experience and high satisfaction, makes a distinction to the existing products, and greatly improves the competitiveness of the products on the market.The tension element is provided as a flexible element, so that the tension element has a certain flexibility and flexibility, which is favorable for the deformation of the tension element by rolling up. In this way, the support foot can be easily retracted inward when being folded, thereby ensuring the retracting action of the support foot, i.e., the retracting action of the sliding member; and when the support foot needs to be folded by the user, the present disclosure provides simple and easy operation, thereby significantly improving the user's experience of use.The flexible member is made of steel wire, whereby not only the strength of the tension member is ensured to prevent breaking by pulling, but also the durability is improved, good flexibility and bending is ensured, and good reaction force is formed inward when the support foot is pivoted and folded so that the support foot can be retracted inward; alternatively, the flexible member can also be provided as a cord or a woven tape so that the support foot can be retracted inward when the support foot is pivoted and folded, i.e., the support foot can be synchronously retracted inward when pivoted and folded, which facilitates the operation of the user and reduces the overall cost of the child seat because the material cost of the cord or the woven tape is low.The drive element is provided to pivot together with the support foot so that the traction element forms a good reaction force when the support foot is pivoted and folded, i.e. the drive element forms a certain rolling on the traction element in order to draw the support foot better inwards and to allow the support foot to be fully folded. In this way, the sliding member does not protrude too far from the front end of the base, which would impair the riding feeling of the children, improve the experience of use of the child seat, reduce the volume of the child seat during transportation, and reduce the transportation cost.The driving member is provided on the support foot to facilitate the pivoting of the driving member together with the support foot, and the driving member is integrated with the support foot and serves as part of the support foot, thereby ensuring the strength and durability of the driving member and extending the life; alternatively, the driving member and the support foot are separately formed and may be connected and fixed by a fixing structure to facilitate the structure and position arrangement of the driving member without being limited by the structure and position, and provide a more flexible structural construction.The driving member is provided at the upper end of the support foot so that the support foot can be retracted by pivoting at a small angle when the support foot is pivoted and folded, thereby not only saving the applied force in pivoting and folding the support foot, but also reducing the length of the tension member, thereby reducing the material cost and the overall production cost.The driving element is in the form of a bead and is provided with an arcuate part which cooperates with the traction element so that the driving element can exert a better rolling action on the traction element when the support foot is pivoted and folded, and the traction element can exert a greater reaction force inwards to retract the support foot inwards and ensure the retraction action of the support foot, i.e. the retraction action of the sliding element; alternatively, the driving element can be provided in the form of a roller or a column so that the driving element can exert a better rolling action on the traction element, i.e. the traction element is forced to produce a sufficient reaction force to pull the support foot for retraction and to achieve a good retraction effect.The first end of the tension member is fixedly connected to the base and the second end of the connection member is fixedly connected to the driving member such that one end of the tension member is fixedly disposed and the other end thereof is movably disposed, whereby the other end of the tension member is rolled and tightened by the driving member when the support foot is pivoted and the tension member is forced to ensure that when the tension member is forced to pivot outward by the driving member, a reaction force for pulling the support foot to retract inward can be formed, thereby ensuring that the support foot can be synchronously retracted when pivoted and folded and the tension member is stably and reliably loaded and does not easily break, and the support foot can be retracted by being pivoted at a small angle. Alternatively, the second end of the traction element can be directly fixed to the upper end of the support foot, so that the support foot directly drives the traction element when the support foot is pivoted and folded, and under the action of the drive element the traction element is tightened to form a reaction force, so that a synchronous inward retraction is realized when the support foot is pivoted and folded.The mounting column is disposed on the base and the first end of the tension member is secured by the cooperation of the mounting member and the mounting column with the base. This method of attachment is simple, reliable and cannot be loosened so easily that the action of the tension element is ensured.The stroke enhancing mechanism is provided, and the first end of the stroke enhancing mechanism is connected to the base, and the second end of the stroke enhancing mechanism is connected to the support foot through the tension member, so that when the support foot is pivoted and folded, the tension member is driven to drive the stroke enhancing mechanism, and then the stroke enhancing mechanism drives the support foot to retract inward, so that the support foot retracts synchronously inward when folded, which is convenient for operation, and increases the retraction length of the support foot inward to meet better usage requirements.The rhombic telescopic frame is used to ensure not only a good telescopic effect but also a large telescopic variation of the rhombic telescopic frame, i.e., it can be extended to a long length and retracted to a short length, whereby the stroke can be more increased, particularly the effect of retracting the support foot is greatly improved, and at the same time it is stable enough and deforms or loosens not easily when the support foot is pulled. Secondly, the rhombic telescopic frame has a simple structure favorable for production and assembly and improves the efficiency of production and assembly. Specifically, the rhombic telescopic frame is composed of a plurality of rhombic structures, and the rhombic structures include a plurality of sets of two connecting rod assemblies hinged at their central position and connected to each other to ensure the effect of action of the rhombic telescopic frame and facilitate the manufacture and assembly of the rhombic telescopic frame.The mounting frame is intended to facilitate reliable mounting between the lift amplification mechanism and the base and to ensure stability and reliability of the lift amplification mechanism during extension and retraction.According to the child seat of the present disclosure, when the support foot is pivoted and folded, the tension member is tightened to generate an inward reaction force, so that the support foot is synchronously retracted inward, thereby enabling easy and comfortable operation and a small volume.The slide member is provided and the support foot is pivotally connected to the slide member, so that the support foot can be deployed or folded together with the extension and retraction of the slide member, and the child seat can achieve good safety in the deployed state and a small size in the deployed state in both modes of use. In the first use mode, the seat is directed rearward and the support foot is deployed, or the seat is directed forward and the support foot is deployed; and in the second use mode (i.e., seat elevation), the seat is directed forward and the support foot is deployed. In the first use mode, the seat may be used with the support leg deployed rearward or may be used with the support leg deployed forward. More specifically, the use mode in which the seat is used with the support foot deployed in the rearward direction is suitable for children under 15 months and / or with a height of 0-105 cm, and the use mode in which the seat is used with the support foot deployed in the forward direction is suitable for children older than 15 months and / or with a height of 76 cm-105 cm, i.e. an infant mode. In the second use mode (seat elevation), the seat must be directed forwards and the support foot must be folded in before use. This mode is suitable for children with a height of 100 cm to 150 cm, i.e. a mode for older children.In the first mode of use, the support foot is extended or retracted to adjust a ground contacting position of the support foot after deployment, thereby ensuring a correct position of the upper end of the support foot supported on the base, so that a good support is provided for the child seat and the child seat can be well prevented from tilting and safety is ensured in use of the child seat; at the same time, the rear seat has sufficient space in the rear row of the vehicle to provide a good cushioning effect upon impact of the vehicle due to the sufficient front and rear clearances, and providing good protection for small children, and a large space for ease of installation of the child seat and facilitating the putting down or taking out of the small children. In the second mode of use, i.e. when the support foot is not needed, the support foot can be folded and hidden under the base and then installed on the vehicle seat in order for the older children to be able to use it. In view of the fact that children of the child are generally larger than young children and thus require more space, the present disclosure not only increases the space of the rear row of seats of the vehicle to provide sufficient space for children of the child, but also forms a better buffer upon impact of the vehicle, because the front and rear spaces are large enough to provide better protection for the children of the child, simultaneously provides space for the foot space of the children of the child, improves comfort in driving in the child seat and ensures safety and stability of the children of the child when the child seat is used for the children of the child; and the support foot is hidden when not used, thereby reducing the child seat's overall size, reducing the child seat's packaging volume and thereby reducing transport costs. Moreover, by extending and retracting the slide member, i.e., the support foot, the overall size of the child seat can be changed. The size of the rear row space is different for different types of vehicles, and the present disclosure can be adapted to different types of vehicles, which greatly improves the application range of the child seat. At the same time, this child seat can realize two use modes, i.e., a small child use mode and an older child use mode, i.e., a multifunctional seat, thereby greatly improving the application range of the child seat, so that the user only needs to buy one child seat to realize a plurality of functions, greatly reducing the user's use cost, offering better attractiveness to the users, forming product differentiation, and greatly improving the market wettability of the products.As compared with the related art, in the rotary lock display mechanism provided by the present disclosure, the state display is provided at least on the unlocking operation member to display the first state and the second state when the unlocking operation member is in the first position and the second position, respectively, to provide information to the user on whether the seat of the child seat is positioned in place and locked to the base, thereby providing better user experience for the user; at the same time, the rotary lock display mechanism in the present disclosure can also prevent the safety risk caused by the child seat not being locked, thereby improving the safety of use. Moreover, the rotary lock indicator mechanism has advantages of simple structure, convenient handling, low cost, convenient manufacture, processing and assembly, and further reduced maintenance costs.Although in this specification, relative terms such as "up" and "under" are used to describe the relative relationship between one component and another component in the drawings, these terms are used in this specification only for convenience, for example, according to the directions of the examples described in the drawings. It will be appreciated that when the depicted device is turned on top, the component described as being "on" another component becomes the component described as being "under" another component. Other relative terms such as "top", "bottom", "left", and "right" have similar meanings. When a structure is "on" one or more other structures, this may mean that the structure is integrally formed on one or more other structures, that the structure is "directly" arranged on one or more other structures, or that the structure is "indirectly" arranged on one or more other structures via another structure.In this specification, the terms "a," "an," and "the," and "at least one" are used to express the presence of one or more elements / components, or the like. The terms "comprise", "include", and "have" are intended to be inclusive and mean that there may be other elements / ingredients / or the like in addition to the listed elements / ingredients / or the like. The words "first", "second" and "third" are used only as markings and do not represent a numerical limitation of the objects.Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It is also to be understood that a term is to be construed as meaning consistent with meaning in the context of the relevant art, and is not to be interpreted in an idealized or overly formal sense unless expressly so defined herein.Other embodiments of the disclosure will become apparent to those skilled in the art upon consideration of the specification and practice of the disclosure disclosed herein. This application is intended to extend to all variations, uses, or adaptations of the disclosure that generally follow the principles of the disclosure and include such variations from the present disclosure as come within known or customary practice in the art to which the disclosure relates. The specification and examples are to be considered as exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.Although the present disclosure has been described with reference to exemplary embodiments, the terms used are illustrative and exemplary and are not intended to be limiting. Since the present disclosure can be embodied in various forms without departing from the spirit and spirit of the present disclosure, it is to be understood that the above-mentioned embodiments are not limited to any of the above details, but are to be construed in the broadest sense within the scope defined by the claims, and therefore all changes that fall within the scope of the claims or their equivalents are covered by the claims.

Claims

A child seat characterized in that the child seat comprises: a base; a seat rotatably disposed on the base and having a forward state and a rearward state with respect to the base; and a tamperproof mechanism comprising a limiting groove disposed on the seat and a locking member disposed on the base, wherein the locking member is engaged with the limiting groove to prevent the seat from rotating from the rearward state to the forward state, and wherein the locking member comprises a limiting structure for limiting the movement of the locking member with respect to the seat.Child seat according to claim 1, characterised in that the anti-abuse mechanism comprises two of the locking elements and two actuating elements corresponding to the two locking elements, respectively, and the two locking elements are arranged symmetrically.Child seat according to claim 2, characterized in that one of the two actuators is actuated to prevent a corresponding locking element from engaging the limiting groove, so that the seat can be rotated in one direction from the rearward state to the forward state.The child seat according to any one of claims 1 to 3, characterized in that the child seat further comprises a rotation base, the rotation base being formed annularly and comprising the limiting groove, two inclined guide surfaces, and an escape groove, the two inclined guide surfaces being disposed on both sides of the limiting groove, and both ends of the escape groove being connected to the outer sides of the two inclined guide surfaces, respectively.The child seat according to claim 4, characterized in that one end of the locking member is provided with a straight limiting surface and an inclined surface, the locking member being engaged with the limiting groove through the straight limiting surface to prevent the seat from rotating from the rearward state to the forward state, and the inclined surface cooperating with one of the two inclined guide surfaces to guide the locking member into the limiting groove during the rotation of the seat from the rearward state to the forward state.The child seat according to any one of claims 1 to 5, characterized in that the limiting structure comprises a first limiting structure and a second limiting structure, wherein the first limiting structure comprises a first limiting hole and a first limiting element, and the second limiting structure comprises a second limiting hole and a second limiting element.The child seat according to claim 6, characterized in that the first restricting member and the second restricting member pass through the first restricting hole and the second restricting hole, respectively, and are fixed to the base so that the locking member can move only in one direction.The child seat according to claim 7, characterized in that the child seat further comprises a restoring member, and two ends of the restoring member abut against the first limiting hole and the first limiting member, respectively, to apply a constant pressing force to the locking member moving toward the rotation base.The child seat according to any one of claims 7 or 8, characterized in that the first limiting hole and the second limiting hole are both long holes, and the extending directions of the first limiting hole and the second limiting hole coincide with the one direction, and the first limiting member and the second limiting member are both bolts.Child seat according to any one of claims 1 to 9, characterised in that on each side of the seat there is provided a rotary actuator for being actuated to rotate the seat with respect to the base.The child seat according to any one of claims 1 to 10, characterized in that the child seat further comprises: a support foot; a slide member telescopically disposed on the base, the support foot being pivotally connected to the slide member and being extended or retracted together with the slide member; and a tension member configured to rotate the support foot from a deployed position to a deployed position to pull the support foot to move toward the base.Child seat according to claim 11, characterised in that the tension element is a flexible element.The child seat according to claim 12, characterized in that the child seat further comprises a stroke enhancing mechanism having a first end connected to the base and a second end connected to the support foot via the tension member.The child seat according to any one of claims 12 or 13, characterized in that the seat is rotatably disposed on the base and has at least a forward position and a rearward position, and that the child seat has a first use mode in which the slide member is extended and the support foot is deployed to form a ground support and a second use mode in which the slide member is retracted and the support foot is folded toward a ground of the base.A rotary lock indicator mechanism for indicating whether a seat of a child seat rotatable relative to a base is positioned, characterized in that the rotary lock indicator mechanism is disposed on the seat of the child seat and is connected to a rotary lock mechanism for locking the seat on the base, and comprises: an unlock operating member slidably connected to the seat and capable of switching between first and second positions; an unlock pulling member having one end connected to the unlock operating member and the other end connected to the rotary lock mechanism; A state indicator disposed at least on the unlock operating member to indicate a rotational lock state of the seat with respect to the base, wherein when the seat is locked to the base by the rotational lock mechanism, the unlock operating member is in the first position under the action of the unlock pulling member and the state indicator indicates a first state; and when the unlock operating member is operated to switch from the first position to the second position, the unlock operating member drives the unlock pulling member to unlock the lock of the seat and the state indicator indicates a second state.The rotary lock indicator mechanism according to claim 15, characterized in that the unlocking operating member is an unlocking button, and the unlocking button can be moved from the first position to the second position by being pressed in a substantially vertical direction.The rotary lock indicator mechanism according to any one of claims 15 or 16, characterized in that the rotary lock indicator mechanism further comprises: an unlocking elastic return member having one end connected to the seat and the other end connected to the unlocking operation member, wherein the unlocking elastic return member is configured to provide a force to drive the unlocking operation member to the second position, whereby the unlocking pulling member tends to be pulled away from the rotary lock mechanism.The rotary lock indicator mechanism according to claim 17, characterized in that the unlocking elastic return member is a tension spring.The rotary lock indicator mechanism according to claim 18, characterized in that, when the seat is locked, a force exerted by the unlocking elastic restoring element on the unlocking actuation element and thus on the unlocking pulling element is less than the locking force generated by the rotary lock mechanism.The rotary lock display mechanism according to any one of claims 15 to 19, characterized in that the state display comprises: a first display member disposed on an outer surface of the unlocking operation member, wherein when the seat is locked to the base, the unlocking operation member is held in the first position by the unlocking pull member, and the first display member is exposed.The rotary lock indicator mechanism of claim 20, characterized in that the state indicator further comprises: a second indicator disposed on an outer surface of the seat, wherein when the seat is locked to the base, the unlock actuator shields the second indicator; when the unlock actuator is placed in the second position, the first indicator is shielded by the seat and the second indicator is exposed, wherein the first indicator and the second indicator display different information.The rotary lock indicator mechanism according to any one of claims 15 to 21, characterized in that the rotary lock indicator mechanism further comprises: a fastening element fixedly connected to the seat, wherein the unlocking operating element is slidably disposed on the fastening element to slide between the first position and the second position with respect to the seat.The rotary lock display mechanism according to claim 22, characterized in that the state display comprises a first display element, a second display element, a display window, and a display bar, wherein the display bar is fixedly disposed on the fixing member, the first display element and the second display element are sequentially disposed on the display bar in the vertical direction, and the display window is disposed on the unlock operation member, and wherein when the unlock operation member is in the first position, the display window releases the first display element; and when the unlock operation member is in the second position, the display window releases the second display element, and wherein the first display element and the second display element display different information.The rotary lock indicator mechanism according to claim 23, characterized in that the indicator strip is formed integrally with the fastening element and the first indicator element and the second indicator element have different colors.The rotary lock indicator mechanism according to any one of claims 15 to 24, characterized in that the unlocking tension member is an unlocking steel wire.A rotary lock indicator mechanism according to any one of claims 15 to 25, characterized in that the rotary lock mechanism is arranged on the seat and is engageable with a corresponding positioning hole on the base.The rotary lock indicator mechanism according to claim 26, characterized in that the positioning hole comprises a forward positioning hole and a rearward positioning hole, wherein when the seat is in a forward state, the rotary lock mechanism is engaged with the forward positioning hole; and when the seat is in a rearward state, the rotary lock mechanism is engaged with the rearward positioning hole.The rotary lock indicator mechanism according to any one of claims 23 to 27, characterized in that the rotary lock indicator mechanism comprises: a fixing structure fixedly disposed on the seat, the fixing structure having an open end; a locking member disposed in the fixing structure, the locking member being capable of sliding in the fixing structure; and an end of the locking member being configured to extend from the open end of the fixing structure to engage with the positioning hole; and a tension member having one end connected to the other end of the lock member and the other end connected to the unlock operation member of the rotary lock indicator mechanism, wherein when one end of the lock member extends out of the fixing structure and engages with the positioning hole, the unlock operation member is in the first position under the action of the tension member, and when the unlock operation member is operated to switch from the first position to the second position, the lock member is retracted into the fixing structure by the tension member.The rotary lock indicator mechanism according to claim 28, characterized in that the rotary lock mechanism further comprises: an elastic restoring member that is disposed between the fixing structure and the locking member and continuously applies a force to drive an end of the locking member out of the fixing structure.A rotary lock indicator mechanism according to any one of claims 28 or 29, characterized in that the tension member and the unlock tension member are integrated.A rotary lock indicator mechanism for indicating whether a seat of a child seat rotatable relative to a base is positioned, characterized in that the rotary lock indicator mechanism is disposed on the seat and is connected to a rotary lock mechanism for locking the seat on the base, and comprises: an unlock operating member slidably connected to the seat and capable of switching between first and second positions; an unlock pulling member having one end connected to the unlock operating member and the other end connected to the rotary lock mechanism; A state indicator for indicating a rotational locking state of the seat with respect to the base, wherein when the seat is locked to the base by the rotational locking mechanism, the unlocking operation member is in the first position and the state indicator is exposed, and when the unlocking operation member is operated to switch from the first position to the second position, the unlocking operation member drives the unlocking pull member to release the locking of the seat, and the state indicator is shielded.The rotary lock display mechanism according to claim 31, characterized in that the state display includes a first display element, the first display element is disposed on the unlocking operation element and is exposed when the seat is locked to the base, wherein when the lock between the seat and the base is released, the first display element is shielded by the seat together with the movement of the unlocking operation element.The rotary lock display mechanism according to claim 31 or 32, characterized in that the state display further comprises a second display element, the second display element is disposed on the seat or the unlock operating element, and shielded by the unlock operating element when the seat is locked to the base, wherein when the lock between the seat and the base is released, the second display element is exposed together with the movement of the unlock operating element.A child seat, characterized in that the child seat comprises: a seat; a base on which the seat is disposed; the rotary lock indicator mechanism according to any one of claims 15-33 disposed at a side of the seat.The child seat according to claim 34, characterized in that two of the rotary lock indicator mechanisms are provided, and the two rotary lock indicator mechanisms are respectively disposed on two sides of the seat; the tension member of the rotary lock mechanism includes: a first tension member having one end connected to the lock member and the other end connected to the unlock operation member of one of the two rotary lock indicator mechanisms; a second tension member having one end connected to the lock member and the other end connected to the unlock operation member of the other of the two rotary lock indicator mechanisms.

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