Seat adjustment structure and child safety seat

Abstract

Seat adjustment structure (100) for adjusting a relative position between a seat (200) and a base (300) supporting the seat (200), wherein the seat adjustment structure (100) can slide along a longitudinal centerline with respect to the base (300) and comprises: a pair of engagement elements (130) which is attached to one of the base (300) and the seat (200) with respect to the longitudinal center axis; a locking assembly (140) which is attached to each other by the base (300) and the seat (200), and which can be locked to or unlocked from the engagement element (130); a handling element (110) that is attached to the seat (200) or the base (300) and can move along a vertical direction with respect to the seat (300); and a cable (190) connecting the handling element (110) and the locking assembly (140) and arranged to transmit a vertical movement of the handling element (110) to the locking assembly (140), thereby causing the locking assembly (140) to be locked or unlocked with respect to the engagement elements (130), so that the base (300) is locked or unlocked with respect to the seat (200), wherein the cable (190) extends along a longitudinal direction of the seat (200) between the handling element (110) and the locking assembly (140).

Description

FIELD OF TECHNOLOGY

[0001] The present application relates to a seat adjustment structure and a child safety seat comprising the seat adjustment structure. BACKGROUND

[0002] A child safety seat is a common device that can be adjusted for small children of different ages. Designed to keep children safe while driving, it can limit dangerous behavior in cars and protect children from injury in accidents such as collisions. Common adjustment functions for child seats are disclosed, for example, in DE 202 15 837 U1, CN 206 561 787 U, and DE 38 09 968 A1.

[0003] Child safety seats are generally equipped with a seat tilt adjustment structure, which allows the seat to be adjusted to an upright or reclined position according to the child's needs. However, a standard seat tilt adjustment structure is usually complicated, making the child safety seat difficult to install and resulting in increased costs.

[0004] In addition, in some usage scenarios, the child safety seat must include both forward and backward adjustment functions. This means the seat must be able to rotate around a generally vertical axis, allowing the seat to face forward, backward, or sideways. Under these circumstances, a new requirement arises for the child safety seat's tilt angle adjustment structure: The tilt angle adjustment structure must have a more flexible handling mode, allowing the user to easily adjust the seat's tilt angle while the seat is facing in any direction.

[0005] The object of the present invention is to solve at least one of these problems. This problem is solved by a seat adjustment structure according to claim 1 or a child safety seat according to a subordinate claim. SUMMARY

[0006] According to the application, a seat adjustment structure is provided for adjusting a relative position between a seat and a base supporting the seat.The seat adjustment structure is slidable with respect to the base along a longitudinal centerline and includes: a pair of engagement members secured to one of the base and the seat with respect to the longitudinal centerline; a locking assembly secured to the other of the base and the seat and lockable to or unlocked from the engagement member; a handling member mounted on one of the seat and the base and moveable along a vertical direction with respect to the seat; and a cable connecting the handling member and the locking assembly and arranged to transmit vertical movement of the handling member to the locking assembly, thereby causing the locking assembly to lock or unlock with respect to the engagement member, such that the base is locked or unlocked with respect to the seat.The cable extends along a longitudinal direction of the seat between the handling element and the locking assembly.

[0007] According to the application, a child safety seat is provided, comprising: a seat for an occupant to sit thereon; a base for securing the child safety seat to a vehicle; and the seat adjustment structure according to the application arranged between the seat and the base; wherein the seat comprises a rotatable disc, the rotatable disc is arranged on a side of the seat facing the base, and the rotatable disc can rotate with respect to the base by a vertical rotary shaft located on its longitudinal centerline; the seat adjustment structure is connected to the rotatable disc to be arranged above the rotatable disc in a manner such that it can slide with respect to the rotatable disc along the longitudinal centerline. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In the following, embodiments of the application are specifically described in conjunction with the accompanying drawings, wherein: Fig. Figure 1A is a side view of a child safety seat according to the application, with the seat in an approximately upright position; Fig. Figure 1B is a further side view of the child safety seat according to the application, in which the seat is in a position inclined to some extent; Fig. Figure 2 is a perspective view of the child safety seat according to the application; Fig. 3A is a perspective view of the child safety seat according to the application with a surface of the seat removed to show a seat adjustment structure below the surface; Fig. 3B is a partially enlarged view of Fig. 3A is; Fig. Figure 4 is a perspective view of the child safety seat according to the application; Fig. 5 is a perspective view of the locking assembly of the seat adjustment structure according to the application, with a positioning cover of the locking assembly removed to show an engagement pin and a resilient return member covered and shielded by the positioning cover; Fig. Figure 6A is a side sectional view of the child safety seat according to the application, with the seat in a forward-facing position; Fig. Figure 6B is a further side sectional view of the child safety seat according to the application, with the seat in a rearward-facing position; and Fig. 7 is a perspective view of a handling element according to the application. DETAILED DESCRIPTION

[0009] Although the disclosure is illustrated and described herein with reference to specific embodiments, the disclosure is not intended to be limited to the details shown. In particular, various modifications may be made to these details within the scope of the equivalents of the claims and without departing from the disclosure.

[0010] Directional terms such as "front", "back", "top" and "bottom" contained in this document are for convenience only, and the disclosure is not limited to these directions, but may be adjusted according to the actual situation.

[0011] A child safety seat according to the application is described with reference to the Fig. 1A-2 generally explained.

[0012] As shown, the child safety seat comprises a base 300 and a seat 200. The base 300 is a part that secures the entire child safety seat, for example, to a rear seat of a car, and the seat 200 is supported on the base 300 and is used for a child to sit on. The seat 200 is attached to the base 300 via a seat adjustment structure 100, more specifically to a rotatable disc 310 (see Fig. 3A-3B) located on an upper surface of the base 300. An overall assembly sequence of the child safety seat from top to bottom is approximately the seat 200, the seat adjustment structure 100, the rotatable disc 310, and the base 300. In the application, the seat adjustment structure 100 enables movement of the seat 200 relative to the base 300 in a front-to-rear direction. Because the seat adjustment structure 100 is attached to the rotatable disc 310, the rotatable disc 310 enables rotation of the seat 200 relative to the base 300 about a longitudinal axis. However, it should be understood that the seat adjustment structure 100 of the application does not necessarily have to cooperate with the rotatable disc 310, but may be connected to the base 300 through other rotatable structure(s) or may be attached directly to the base 300.

[0013] The seat adjustment structure 100 of the application will now be described with reference to the Fig. 3A-3B are described in more detail.

[0014] As illustrated, the seat adjustment structure 100 includes a plurality of components, such as a handling member 110, a seat support 120, engagement members 130, and a locking assembly 140. The handling member 110 is a component located outside the seat 200 and operable by the user. The seat support 120 is a component attached to the seat 200 to support the seat 200. The engagement members 130 are each a component attached to the base 300. The locking assembly 140 is attached to the seat support 120 and serves to lock and unlock a positional relationship between the seat support 120 and the engaging elements 130. The handling element 110 is connected to the locking assembly 140 via a cable 190 so that the user can operate the locking assembly 140.In other embodiments, the engagement members 130 may be attached to the seat support 120 and the locking assembly 140 may be attached to the base 300.

[0015] The handling element 110 is a handle that is inserted into the seat 200 and can move vertically (see Fig. 6A-7). The cable 190 is connected between the handling element 110 and the locking assembly 140. A guide element is arranged below the handling element 110 to guide the cable 190, which connects from below the seat 200 to the locking assembly 140, along an arc. A structure within the locking assembly 140 can convert a longitudinal movement of the cable 190 (described in detail below) into a lateral movement (Y-axis direction). In this way, a vertical movement of the handling element 110 is ultimately converted into a lateral movement of a locking pin in the locking assembly 140.

[0016] The seat support 120 is a tubular component that extends from a bottom of the seat 200 to a rear of the seat 200 along an arcuate path. In this embodiment, the seat support 120 extends substantially horizontally (i.e., runs longitudinally) at the bottom of the seat 200 and gradually transitions to a substantially vertical extension at the rear of the seat 200. In this embodiment, two seat supports 120 are arranged in parallel on both the left and right sides of the seat 200. It should be understood that the shape and number of the seat supports 120 can be determined according to the specific requirements of the seat 200 and are not limited to the shape and number in the embodiments of the application.

[0017] Each of the engagement elements 130 is a planar component that is attached to the base 300 and includes two side plates 131 that extend substantially along an inner direction of the seat support 120 and have a shorter length than that of the seat support 120. In this embodiment, two pairs of engagement elements 130 are arranged, with one pair of engagement elements 130 being arranged at positions on the bottom of the seat 200 and thus extending substantially longitudinally; and the other pair of engagement elements 130 being arranged at positions on the rear of the seat 200 and thus extending substantially vertically. In other embodiments, only one pair of engagement elements 130 may be arranged.In this embodiment, the locking assembly 140 is disposed only on the engaging elements 130 at positions on the floor, and in other embodiments, the locking assembly 140 may be disposed on each pair of engaging elements 130.

[0018] A plurality of engagement holes 132 are formed on one of the side plates 131 of each engagement member 130. The engagement holes 132 are arranged along a moving direction (ie, the longitudinal direction) of the seat 200, and the distance between the engagement holes 132 is designed such that the engagement holes 132 are suitable for simultaneous engagement by two foot portions 171 (see Fig. 4-5) of an engagement pin 170 in the locking assembly 140. Sliding slots 133 are arranged above the engagement holes 132. The extension direction of the sliding slots 133 is the same as the arrangement directions of the engagement holes 132, and the widths of the sliding slots 133 are suitable for being passed by a crossbar 180. In other embodiments, the sliding slots 133 can also be arranged below the engagement holes 132.

[0019] The locking assembly 140 is a box-shaped component that extends between a pair of engaging elements 130. The crossbar 180 passes laterally through and is secured to the locking assembly 140 and extends outwardly from both lateral sides of the locking assembly 140. Both ends of the crossbar 180 are attached to the seat support 120 by passing through the sliding slots 133 on the engaging elements 130. In this way, relative sliding between the engaging elements 130 and the locking assembly 140 is enabled by the crossbar 180 and the sliding slots 133, and sliding paths of the engaging elements 130 are defined.

[0020] The rotatable disc 310 is located below the engaging elements 130. The rotatable disc 310 is connected to the base 300 via a vertical rotating shaft 320 to rotate around the vertical direction.

[0021] In this way, the rotatable disc 310 realizes the rotating function of the seat 200, and the seat adjustment structure 100 realizes the moving function of the seat 200 along the extending direction of the seat support 120. In the present embodiment, the extending direction of the seat support 120 is an arc, and in other embodiments, the extending direction of the seat support 120 may also be a straight line or another shape.

[0022] The concrete structure of the locking assembly 140 is described with reference to the Fig. 4-5 described.

[0023] As shown, the locking assembly 140 includes a fixed seat 160, a positioning cover 150, a pair of engagement pins 170, resilient return members 175, and reinforcing members 166.

[0024] The fixed seat 160 extends laterally and includes a bottom wall 161, two side walls 163 on both sides of the lateral direction, and two end walls 162 at both ends of the lateral direction, thereby defining a receiving space. A cable hole 165, through which the cable 190 can be longitudinally passed into the receiving space, is located at a lateral center of one of the side walls 163 of the fixed seat 160. Each of the end walls 162 is provided with pin holes 164 and crossbar holes 167. Among them, two pin holes 164 are provided at lower parts of the end walls 162 and distributed in the longitudinal direction; and two crossbar holes 167 are provided at upper parts of the end walls 162 and correspond to the middle positions of the two pin holes 164.

[0025] The positioning cover 150 is mounted on the fixed seat 160 and covers the receiving space. The positioning cover 150 is substantially parallel to the bottom wall 161 of the fixed seat 160 and is arranged vertically between the pin holes 164 and the crossbar holes 167. A side of the positioning cover 150 facing the bottom wall 161 is provided with cable guide portions (not shown) for guiding the cable 190 to extend laterally.

[0026] Each of the engagement pins 170 is approximately U-shaped and includes a connecting portion 172 and two foot portions 171. The foot portions 171 each extend in the lateral direction, are inserted into the pin holes 164 in the lateral end walls 162 of the fixed seat 160, and can protrude from the locking assembly 140 to be inserted into the corresponding engagement holes 132. The connecting portion 172 is connected between the two foot portions 171 and is located in the receiving space to position the engagement pins 170 in the locking assembly 140.

[0027] Each of the elastic return members 175 abuts with one end against the fixed seat 160 of the locking assembly 140 or the positioning cover 150, and with the other end against the connecting portion 172 to exert a pushing force on the engaging pins 170 to protrude from the locking assembly 140. In this way, the engaging pins 170 tend to protrude from the locking assembly 140.

[0028] The reinforcement members 166 are attached to outer sides of the end walls 162 of the fixed seat 160 to reinforce the structure of the locking assembly 140.

[0029] One end of the cable 190 is connected to the handling element 110, and the other end of the cable 190 is split into two branch cables 190 after passing through the cable hole 165. Furthermore, the two branch cables 190 extend laterally over corresponding cable guide portions and are connected to the corresponding engagement pins 170. The cable guide portions are arranged on the side of the positioning cover 150 facing the bottom wall 161. In one embodiment, the cable guide portions are designed as cable grooves, and the cable grooves are approximately quarter-circular arc grooves that extend curvedly from the cable hole 165 toward the engagement pins 170 to accommodate the branch cables 190 and define the movement paths of the branch cables 190.In another embodiment, the cable guide sections are designed as rollers that are rotatable about a vertical axis to support the branch cables 190 and to rotate the branch cables 190 from the longitudinal direction to the lateral direction.

[0030] In this way, by routing the cable 190, when the user pulls the handling member 110 upward, the engaging pins 170 are retracted into the locking assembly 140, thereby unlocking the positional relationship between the locking assembly 140 and the engaging members 130 to allow relative longitudinal movement between the seat 200 and the base 300. When the user releases the handling member 110, the engaging pins 170 extend from the locking assembly 140 to be inserted into the engaging members 130, thereby locking the relative longitudinal movement between the seat 200 and the base 300.

[0031] With reference to the Fig. 6A-6B describe advantages of the seat adjustment structure of the application.

[0032] In Fig. 6A, the seat 200 is in a position facing the front of the base 300 (right in the figure), and in Fig. 6B, the seat 200 is in a position facing the rear of the base 300 (on the left in the figure). It is clear that regardless of the direction in which the seat 200 is rotated, the user can easily pull the handle 110 to unlock the relative longitudinal movement between the seat 200 and the base 300. However, since in some prior art designs, the handle connected to the locking assembly is designed to extend in the same direction as the direction of movement of the seat, that is, the user must pull or push the handle along the longitudinal direction, the user's pulling or pushing of the handle when the seat is facing rearward may accordingly interfere with the backrest of the rear seat of the vehicle, so that it may be difficult for the user to use the handle.

[0033] The positional relationship between the locking assembly 140 and the engaging elements 130 is also apparent from the Fig. 6A-6B. Since each engagement element 130 is provided with a plurality of engagement holes 132, the locking assembly 140 can lock the seat 200 in various longitudinal positions.

[0034] According to the application, a seat adjustment structure is provided for adjusting a relative position between a seat and a base supporting the seat.The seat adjustment structure is slidable with respect to the base along a longitudinal centerline and includes: a pair of engagement members secured to one of the base and the seat with respect to the longitudinal centerline; a locking assembly secured to the other of the base and the seat and lockable to or unlocked from the engagement member; a handling member mounted on one of the seat and the base and moveable along a vertical direction with respect to the seat; and a cable connecting the handling member and the locking assembly and arranged to transmit vertical movement of the handling member to the locking assembly, thereby causing the locking assembly to lock or unlock with respect to the engagement member, such that the base is locked or unlocked with respect to the seat.

[0035] In one embodiment, a plurality of engagement holes are formed in each of the engagement elements; the locking assembly is provided with a pair of engagement pins, the engagement pins can be extended and retracted along a lateral direction perpendicular to the longitudinal centerline, thereby extending and inserting them into the corresponding engagement holes to lock the locking assembly to the engagement elements, or retracting them from the corresponding engagement holes to unlock the locking assembly from the engagement elements; and the cable connects the handling element and the engagement pins and is arranged to transmit the vertical movement of the handling element to the engagement pins so that the engagement pins can be extended and retracted.

[0036] In one embodiment, the seat adjustment structure further comprises a crossbar arranged corresponding to the engagement elements, the crossbar extending along the lateral direction and being fixed to one of the base and the seat; the engagement elements are each provided with sliding slots defining a sliding path, and the crossbar passes through the sliding slots, so that when the seat slides with respect to the base, the crossbar slides with respect to the sliding slots along the sliding path.

[0037] In one embodiment, the engaging elements comprise a pair of parallel side plates, and the plurality of engaging holes are arranged on one side of the sliding slots at regular intervals along the sliding track.

[0038] In one embodiment, the locking assembly is located between the engaging elements and comprises: a fixed seat extending along the lateral direction to define a receiving space, wherein the crossbar passes through the fixed seat; and a positioning cover mounted on the fixed seat to cover the receiving space; wherein the two engaging pins are respectively disposed in the receiving space, and are arranged on two lateral end walls of the fixed seat and can protrude from the fixed seat to be inserted into the engaging holes, or can separate from the engaging holes to be retracted into the fixed seat.

[0039] In one embodiment, the fixed seat of the locking assembly is provided with a cable hole for longitudinally guiding the cable into the receiving space, and the cable hole is located at a central position of a side wall of the fixed seat facing the handling member; a side of the positioning cover facing a bottom wall of the fixed seat is provided with cable guiding portions for guiding the cable to extend laterally; and one end of the cable is connected to the handling member, and the other end of the cable is split into two branch cables after passing through the cable hole, the two branch cables extending laterally over their respective cable guiding portions and connected to the corresponding engaging pins.

[0040] In one embodiment, the engagement pins are approximately U-shaped and include: two leg portions each extending along the lateral direction and inserted into the lateral end walls of the fixed seat, and capable of projecting from the locking assembly to be inserted into the corresponding engagement holes; and a connecting part connected between the two leg portions and located in the receiving space.

[0041] In one embodiment, the locking assembly further comprises elastic return elements, each of the elastic return elements being fixed at one end to the fixed seat or the positioning cover of the locking assembly and the other end abutting against the connecting portion to exert a pushing force on the engaging pins to protrude them from the locking assembly.

[0042] In one embodiment, reinforcing elements are respectively attached to the outer sides of the two lateral end walls of the fixed seat.

[0043] In one embodiment, the cable guide portions are cable grooves, and the cable grooves are approximately quarter-circular arc grooves that extend curvedly from the cable hole toward the engaging pins to accommodate the branch cables and define movement paths of the branch cables; or the cable guide portions are rollers rotatable about a vertical axis for supporting the branch cables to rotate the branch cables from the longitudinal direction to the lateral direction.

[0044] In one embodiment, the engagement elements are attached to the base; and the locking assembly is attached to the seat via the crossbar.

[0045] According to the application, a child safety seat is provided, comprising: a seat for an occupant to sit thereon; a base for securing the child safety seat to a vehicle; and the seat adjustment structure according to the application arranged between the seat and the base; wherein the seat comprises a rotatable disc, the rotatable disc is arranged on a side of the seat facing the base, and the rotatable disc can rotate with respect to the base by a vertical rotary shaft located on its longitudinal centerline; the seat adjustment structure is connected to the rotatable disc to be arranged above the rotatable disc in a manner such that it can slide with respect to the rotatable disc along the longitudinal centerline.

[0046] In one embodiment, the rotatable disc has an arcuate surface along an arc between a floor and a backrest of the seat, the arcuate surface having an approximately horizontal portion and an approximately vertical portion.

[0047] The seat adjustment structure further comprises another pair of engagement members and another crossbar, wherein the pair of engagement members and the crossbar are arranged on a horizontal portion of the rotatable disc, and the another pair of engagement members and the another crossbar are arranged on a vertical portion of the rotatable disc.

[0048] Although the present disclosure has been described with reference to typical embodiments, the terms used are illustrative and exemplary, not restrictive. Since this application may be embodied in various forms without departing from the spirit and scope of the disclosure, it is to be understood that the above-mentioned embodiments are not limited to any of the foregoing details, but should be construed broadly within the scope defined by the claims. Accordingly, all changes that come within the scope of the claims or their equivalents are intended to be covered by the claims. List of reference symbols 100 Seat adjustment structure 110 Handling element 120 seat support 130 engagement element 131 side plate 132 intervention hole 133 sliding slot 140 Locking assembly 150 Positioning cover 160 Fixed seat 161 floor wall 162 front wall 163 side wall 164 pin hole 165 cable hole 166 Reinforcing element 167 Crossbar hole 170 engagement pin 171 Foot section 172 connecting section 175 Elastic return element 180 crossbar 190 cables 200 seats 300 Base 310 Rotating disc 320 Vertical rotating shaft M Longitudinal centerline X Longitudinal direction (forward-backward direction) Y Lateral direction (left-right direction) Z Vertical direction (up-down direction)

Claims

[1] A seat adjustment structure (100) for adjusting a relative position between a seat (200) and a base (300) supporting the seat (200), the seat adjustment structure (100) being slidable relative to the base (300) along a longitudinal centerline and comprising: a pair of engagement elements (130) fixed to one of the base (300) and the seat (200) with respect to the longitudinal central axis; a locking assembly (140) attached to the other of the base (300) and the seat (200) and lockable to or unlockable from the engaging member (130); a handling element (110) mounted on the seat (200) or the base (300) and movable along a vertical direction relative to the seat (300); and a cable (190) connecting the handling element (110) and the locking assembly (140) and arranged to transmit a vertical movement of the handling element (110) to the locking assembly (140), thereby causing the locking assembly (140) to be locked or unlocked with respect to the engagement elements (130) so that the base (300) is locked or unlocked with respect to the seat (200), wherein the cable (190) extends along a longitudinal direction of the seat (200) between the handling element (110) and the locking assembly (140). [2] Seat adjustment structure (100) according to claim 1, wherein: a plurality of engagement holes (132) are formed on each of the engagement elements (130); the locking assembly (140) is provided with a pair of engagement pins (170), wherein the engagement pins (170) can be extended and retracted along a lateral direction perpendicular to the longitudinal center line, whereby they can be extended and inserted into the corresponding engagement holes (132) to lock the locking assembly (140) with the engagement elements (130) or can be retracted from the corresponding engagement holes (132) to unlock the locking assembly (140) from the engagement elements (130); and the cable (190) connects the handling element (110) and the engagement pins (170) and is arranged to transmit the vertical movement of the handling element (110) to the engagement pins (170) so that the engagement pins (170) can be extended and retracted along the lateral direction. [3] Seat adjustment structure (100) according to claim 2, further comprising: a crossbar (180) arranged corresponding to the engagement elements (130), the crossbar (180) extending along the lateral direction and being fixed to one of the base (300) and the seat (200); wherein the engagement elements (130) are each provided with sliding slots (133) and the crossbar (180) extends through the sliding slots (133) so that when the seat (200) slides with respect to the base (300), the crossbar (180) slides with respect to the sliding slots (133) along the sliding track. [4] Seat adjustment structure (100) according to claim 3, wherein: the engaging elements (130) comprise a pair of parallel side plates (131), and the plurality of engaging holes (132) are arranged on one side of the sliding slots (133) at regular intervals along the sliding path. [5] Seat adjustment structure (100) according to claim 4, wherein: the locking assembly (140) is arranged between the engagement elements (130) and comprises: a fixed seat (160) extending along the lateral direction to define a receiving space, wherein the crossbar (180) passes through the fixed seat (160); and a positioning cover (150) mounted on the fixed seat (160) to cover the receiving space; wherein the two engagement pins (170) are each arranged in the receiving space, and are arranged on two lateral end walls (162) of the fixed seat (160), and can extend from the fixed seat (160) to be inserted into the engagement holes (132) or can separate from the engagement holes (132) to be retracted into the fixed seat (160). [6] Seat adjustment structure (100) according to claim 5, wherein: the fixed seat (160) of the locking assembly (140) is provided with a cable hole (165) so that the cable (190) can be guided longitudinally into the receiving space, and the cable hole (165) is arranged at a central position of a side wall of the fixed seat facing the handling element (110); a side of the positioning cover (150) facing a bottom wall of the fixed seat is provided with cable guide portions for guiding the cable (190) so that it extends laterally; and one end of the cable (190) is connected to the handling element (110), and the other end of the cable (190) is divided into two branch cables after passing through the cable hole (165), the two branch cables extending laterally over their respective cable guide sections and being connected to the corresponding engagement pins (170). [7] Seat adjustment structure (100) according to claim 6, wherein: the engagement pins (170) are approximately U-shaped and comprise: two foot portions (171) each extending along the lateral direction and inserted into the lateral end walls (162) of the fixed seat (160) and capable of projecting from the locking assembly (140) to be inserted into the corresponding engagement holes (132); and a connecting portion (172) connected between the two foot portions (171) and located in the receiving space. [8] Seat adjustment structure (100) according to claim 7, wherein: the locking assembly (140) further comprises elastic return elements (175), each of the elastic return elements (175) having one end fixed to the fixed seat (160) or the positioning cover (150) of the locking assembly (140) and the other end abutting the connecting portion (172) to exert a pushing force on the engaging pins (170) to protrude outwardly from the locking assembly (140). [9] Seat adjustment structure (100) according to claim 8, wherein: Reinforcing elements (166) are each attached to the outer sides of the two lateral end walls (162) of the fixed seat (160). [10] Seat adjustment structure (100) according to one of claims 6 to 9, wherein: the cable guide sections are cable grooves, and the cable grooves are approximately quarter-circle arc grooves that extend curvedly from the cable hole (165) toward the engagement pins (170) to accommodate the branch cables and define movement paths of the branch cables; or the cable guide sections are rollers rotatable about a vertical axis for supporting the branch cables in order to rotate the branch cables from the longitudinal direction to the lateral direction. [11] Seat adjustment structure (100) according to one of claims 3 to 10, wherein: the engagement elements (130) are attached to the base (300); and the locking assembly (140) is attached to the seat via the crossbar (180). [12] Child safety seat, comprising: one seat (200); a base (300) for attaching the child safety seat to a vehicle; and the seat adjustment structure (100) according to claim 1, arranged between the seat (200) and the base (300); wherein the seat (200) comprises a rotatable disc (310), the rotatable disc (310) is arranged on a side of the seat (200) facing the base (300), and the rotatable disc (310) can rotate with respect to the base (300) by a vertical rotary shaft (320) located on its longitudinal center line; and the seat adjustment structure (100) is connected to the rotatable disc (310) to be arranged above the rotatable disc (310) in a manner such that it can slide with respect to the rotatable disc (310) along the longitudinal centerline. [13] Child safety seat according to claim 12, wherein: the rotatable disc (310) has an arcuate surface along an arc between a floor and a backrest of the seat (200), the arcuate surface including an approximately horizontal portion and an approximately vertical portion; and the seat adjustment structure (100) further comprises another pair of engagement elements (130) and another crossbar (180), wherein the pair of engagement elements (130) and a crossbar (180) arranged corresponding to the engagement elements (130) are arranged on a horizontal portion of the rotatable disc (310), and the other pair of engagement elements (130) and the other crossbar (180) are arranged on a vertical portion of the rotatable disc (310).

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