Safety seat

Abstract

This utility model discloses a child safety seat, belonging to the field of seat technology. The child safety seat includes a base and a seat body. The base includes a bottom support and a rear support disposed on the bottom support. The seat body includes a seat and a backrest rotatably connected to the seat. The seat is adjustablely disposed on the bottom support and has a sitting position and a reclining position. When changing from the sitting position to the reclining position, the seat moves away from the rear support, and the rear side of the seat is relatively raised. During the adjustment of the seat relative to the bottom support, the seat can move closer to or further away from the rear support, and the rear side of the seat can be raised or lowered. Because the seat and backrest are rotatably connected, the angle between the seat and backrest changes during the adjustment of the seat, meeting comfort requirements.

Description

Technical Field

[0001] This utility model relates to the field of child safety seat technology, and in particular to a child safety seat. Background Technology

[0002] To improve child safety while traveling in cars, child safety seats are typically installed. Child safety seats generally consist of a base and a seat body. The seat body provides the child's seat and can slide relative to the base to adjust its position. Usually, the seat and backrest are a single unit. While adjusting the seat body's position changes its recline angle, the fixed angle between the seat and backrest results in poor comfort. Utility Model Content

[0003] The purpose of this invention is to provide a safety seat to improve passenger comfort.

[0004] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0005] A child safety seat, comprising:

[0006] The base includes a bottom support portion and a rear support portion disposed on the bottom support portion;

[0007] The seat body includes a seat portion and a backrest rotatably connected to the seat portion. The seat portion is adjustablely disposed on the bottom support portion and has a sitting position and a reclining position.

[0008] When transitioning from a sitting position to a lying position, the seat portion moves away from the rear support portion, and the rear side of the seat portion is raised.

[0009] Preferably, the seat portion and the bottom support portion are slidably disposed, and the seat portion and the bottom support portion are rotatable relative to each other;

[0010] When lying down, the backrest is supported on the rear support.

[0011] Preferably, one of the seat portion and the bottom support portion is provided with a rotating shaft, and the other is provided with a sliding groove that slides with the rotating shaft and a plurality of positioning holes recessed from the bottom of the sliding groove.

[0012] The rotating shaft moves along the axial direction to a first position and a second position. In the first position, the rotating shaft moves into the positioning hole to restrict the rotating shaft from sliding along the slide groove. In the second position, the rotating shaft disengages from the positioning hole so that the rotating shaft can slide along the slide groove.

[0013] Preferably, the groove is disposed on the bottom support portion and extends in the front-to-back direction, and a plurality of positioning holes are arranged on the bottom support portion in the front-to-back direction;

[0014] The pivot is movably mounted on the seat, and the seat is also provided with a control unit for controlling the movement of the pivot.

[0015] Preferably, the control unit is slidably connected to the seat in the front-back direction. The control unit includes a first abutment part and a second abutment part is provided on the rotating shaft. At least one of the first abutment part and the second abutment part has a guide slope. During the sliding process of the control unit, the first abutment part and the second abutment part abut against each other, and the guide slope guides the rotating shaft to disengage from the positioning hole.

[0016] Preferably, the safety seat also has a locking structure for locking the seat portion, the locking structure being disposed between the seat portion and the backrest, and the position of the two is locked by locking the relative rotation between the seat portion and the backrest.

[0017] Preferably, the locking structure includes two locking pins, which are disposed on the seat portion and selectively inserted into locking holes on the backrest, and the two locking pins are not coaxial.

[0018] Preferably, the backrest and the rear support can rotate and slide relative to each other, and the connection position between the backrest and the rear support is close to the top of the rear support.

[0019] When transitioning from a sitting to a lying position, the bottom of the backrest rotates away from the rear support and the backrest slides downward relative to the rear support.

[0020] Preferably, the rear support is provided with a guide groove, and the backrest is provided with a support shaft that is slidably connected to the guide groove, and the backrest can rotate around the axis of the support shaft.

[0021] Preferably, when the seat is adjusted relative to the bottom support, the angle between the backrest and the vertical plane is 70° and the angle between the seat and the backrest is 145°, and the safety seat is in a zero-gravity state.

[0022] The beneficial effects of this utility model are:

[0023] The safety seat proposed in this utility model allows the seat to move closer to or further away from the rear support during the adjustment of the seat relative to the bottom support. The rear side of the seat can be raised or lowered. Furthermore, since the seat and the backrest are rotatably connected, the angle between the seat and the backrest changes during the adjustment of the seat, thus meeting comfort requirements. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the safety seat and the car seat provided in this embodiment of the utility model.

[0025] Figure 2 This is a structural schematic diagram of the safety seat provided in an embodiment of the present utility model;

[0026] Figure 3 This is an exploded structural diagram of the seat and backrest provided in an embodiment of the present utility model;

[0027] Figure 4 This is a structural schematic diagram of the seat, backrest, and gear shift mechanism provided in an embodiment of the present utility model;

[0028] Figure 5 This is a schematic diagram of the gear shift mechanism provided in this embodiment of the utility model. Figure 1 ;

[0029] Figure 6 yes Figure 5 Enlarged view of point A;

[0030] Figure 7 This is a schematic diagram of the gear shift mechanism provided in this embodiment of the utility model. Figure 2 ;

[0031] Figure 8 yes Figure 7 Enlarged view of point B;

[0032] Figure 9 This is a schematic diagram of the structure of the base provided in an embodiment of the present utility model;

[0033] Figure 10 This is a side view of the base provided in an embodiment of the present utility model;

[0034] Figure 11 This is a schematic diagram of the child safety seat in the first gear position according to an embodiment of the present invention;

[0035] Figure 12 This is a cross-sectional view of the safety seat in the first gear position provided in this embodiment of the utility model;

[0036] Figure 13 This is a schematic diagram of the safety seat in the fourth position according to an embodiment of the present invention;

[0037] Figure 14 This is a cross-sectional view of the safety seat in the fourth gear position provided in this embodiment of the utility model.

[0038] In the picture:

[0039] 100. Car seats;

[0040] 10. Base; 11. Bottom support; 111. Slide groove; 112. Positioning hole; 113. Protruding structure; 12. Rear support; 121. Guide groove;

[0041] 20. Seat body; 21. Seat section; 22. Backrest; 221. Lug;

[0042] 31. Rotating shaft; 311. Second abutment part; 32. Control part; 321. First abutment part; 322. Guide slope; 323. Clearance hole; 33. First elastic element; 34. Second elastic element; 35. Housing;

[0043] 40. Support shaft;

[0044] 50. Seat cushion;

[0045] 60. Leg rest. Detailed Implementation

[0046] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0047] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] See Figures 1 to 14 This embodiment provides a child safety seat, typically installed in a car seat 100 for children to ride in. The child safety seat includes a base 10 and a seat body 20. The base 10 includes a bottom support 11 and a rear support 12 disposed on the bottom support 11. The seat body 20 includes a seat 21 and a backrest 22 rotatably connected to the seat 21. The seat 21 is adjustablely disposed on the bottom support 11 and has a sitting position and a reclining position. When transitioning from the sitting position to the reclining position, the seat 21 moves relatively away from the rear support 12, and the rear side of the seat 21 is relatively raised.

[0051] During the adjustment of the seat part 21 relative to the bottom support part 11, the seat part 21 can move closer to or further away from the rear support part 12, the rear side of the seat part 21 can be raised or lowered, and since the seat part 21 is rotatably connected to the backrest 22, the angle between the seat part 21 and the backrest 22 changes during the adjustment of the seat part 21 to meet comfort requirements.

[0052] For the base 10, the bottom support 11 and the rear support 12 can be integrally formed or detachably connected. The included angle between the bottom support 11 and the rear support 12 is fixed and can be selected as 90 degrees. In use, the bottom support 11 abuts against the seat of the car seat 100, and the rear support 12 abuts against the backrest of the car seat 100.

[0053] Specifically, the rear end of the bottom support 11 is connected to the lower end of the rear support 12, thereby defining the up-down, front-back, and left-right directions of the safety seat. The seat 21 is located at the bottom of the backrest 22, the backrest 22 is located at the rear end of the seat 21, the bottom support 11 is located at the bottom of the seat 21, and the rear support 12 is located at the rear of the backrest 22.

[0054] During the adjustment of the seat 21, the relative position between the seat 21 and the base support 11 changes, and the included angle between the seat 21 and the base support 11 changes. The seat 21 and the base support 11 are slidably disposed, and the seat 21 and the base support 11 can rotate relative to each other; when changing from a sitting position to a lying position, the seat 21 slides away from the rear support 12, and the seat 21 rotates relative to the base support 11 so that the rear side of the seat 21 is raised relative to the base support 11. In the lying position, the backrest 22 is supported on the rear support 12.

[0055] Alternatively, the backrest 22 and the rear support 12 can be rotatably connected; or the backrest 22 and the rear support 12 can rotate and slide relative to each other. The sliding path can be a straight line or a curve. In this embodiment, the backrest 22 and the rear support 12 can rotate and slide relative to each other, and the connection position between the backrest 22 and the rear support 12 is close to the top of the rear support 12; when changing from a sitting position to a lying position, the bottom of the backrest 22 rotates relative to the rear support 12 away from the rear support 12 and the backrest 22 slides downward relative to the rear support 12.

[0056] One of the backrest 22 and the rear support portion 12 is provided with a guide groove 121, and the other is provided with a support shaft 40 slidably connected to the guide groove 121. The backrest 22 can rotate around the axis of the support shaft 40. In this embodiment, the rear support portion 12 is provided with a guide groove 121, and the backrest 22 is provided with a support shaft 40 slidably connected to the guide groove 121. The backrest 22 can rotate around the axis of the support shaft 40. During the movement of the backrest 22 relative to the rear support portion 12, the support shaft 40 slides along the guide groove 121, while the backrest 22 rotates around the axis of the support shaft 40.

[0057] The support shaft 40 is detachably connected to the backrest 22 for easy installation and disassembly. Two guide grooves 121 are provided, parallel and spaced apart. The support shaft 40 can be a long shaft, passing through both guide grooves 121 simultaneously; alternatively, the support shaft 40 can be a short shaft, with one support shaft for each guide groove 121. Specifically, the rear of the backrest 22 has two lugs 221 spaced apart, each lug having a mounting hole for the support shaft 40 to pass through.

[0058] By adjusting the relative position of the seat 21 and the bottom support 11, the backrest 22 can be moved relative to the rear support 12. During the adjustment process, both the seat 21 and the backrest 22 move relative to the base 10, and the angle between the seat 21 and the backrest 22 changes. By changing the angle between the seat 21 and the backrest 22, comfort requirements can be met.

[0059] When transitioning from a sitting position to a lying position, the seat 21 moves away from the rear support 12, and the rear side of the seat 21 is raised. The bottom of the backrest 22 rotates away from the rear support 12 and slides downward relative to the rear support 12, increasing the angle between the seat 21 and the backrest 22.

[0060] When transitioning from a lying position to a sitting position, the seat 21 moves toward the rear support 12, and the rear side of the seat 21 presses down relative to the rear support 12. The bottom of the backrest 22 rotates toward the rear support 12 and slides upward relative to the rear support 12, and the angle between the seat 21 and the backrest 22 decreases.

[0061] One of the seat portion 21 and the bottom support portion 11 is provided with a rotating shaft 31, and the other is provided with a sliding groove 111 that slides with the rotating shaft 31 and a plurality of positioning holes 112 formed by recesses from the bottom of the sliding groove 111. The rotating shaft 31 moves in the axial direction to a first position and a second position. In the first position, the rotating shaft 31 moves into the positioning holes 112 to restrict the rotating shaft 31 from sliding along the sliding groove 111. In the second position, the rotating shaft 31 disengages from the positioning holes 112 so that the rotating shaft 31 can slide along the sliding groove 111.

[0062] The pivot 31 is inserted into different positioning holes 112, and the seat part 21 is in different positions. In different positions, the included angle between the seat part 21 and the bottom support part 11 is different, the included angle between the seat part 21 and the backrest 22 is different, and the included angle between the backrest 22 and the rear support part 12 is different. That is, the included angle between any two of the three components, namely the base 10, the seat part 21 and the backrest 22, can be changed according to the position to meet the comfort requirements.

[0063] The number of positioning holes 112 can be set according to actual needs. There can be two positioning holes 112, three positioning holes 112, four positioning holes 112, or more than four positioning holes 112.

[0064] In this embodiment, a sliding groove 111 is disposed on the bottom support portion 11 and extends in the front-to-back direction. Multiple positioning holes 112 are arranged on the bottom support portion 11 in the front-to-back direction. A rotating shaft 31 is movably disposed on the seat portion 21. Since the positioning holes 112 are located at the bottom of the sliding groove 111, when the rotating shaft 31 disengages from the positioning holes 112, the rotating shaft 31 is located within the sliding groove 111. The sliding groove 111 can restrict the rotating shaft 31 from disengaging from the bottom support portion 11, preventing the seat portion 21 from detaching from the bottom support portion 11 when adjusting its position. The front end of the sliding groove 111 can be open, allowing the rotating shaft 31 to slide out of the sliding groove 111 when the seat portion 21 is disassembled.

[0065] The seat 21 is also equipped with a control unit 32 for controlling the movement of the rotating shaft 31. The rotating shaft 31 can be driven by a cylinder, which moves the rotating shaft 31 between a first position and a second position, so that the rotating shaft 31 inserts into or disengages from the positioning hole 112. The control unit 32 can be a button, which is electrically connected to the cylinder. Pressing the button extends or retracts the piston rod of the cylinder.

[0066] In this embodiment, the control unit 32 is slidably connected to the seat unit 21 in the front-to-back direction. The control unit 32 includes a first abutment part 321 and a second abutment part 311 provided on the rotating shaft 31. At least one of the first abutment part 321 and the second abutment part 311 has a guide slope 322. During the sliding process of the control unit 32, the first abutment part 321 and the second abutment part 311 abut against each other, and the guide slope 322 guides the rotating shaft 31 to disengage from the positioning hole 112. By manually operating the control unit 32, the rotating shaft 31 can be disengaged from the positioning hole 112.

[0067] Specifically, a first elastic element 33 is provided between the control unit 32 and the seat 21, and a second elastic element 34 is provided between the rotating shaft 31 and the seat 21. During sliding, the control unit 32 can compress the first elastic element 33 and drive the rotating shaft 31 to slide out of the positioning hole 112 to release the seat 21. When the rotating shaft 31 disengages from the positioning hole 112, it compresses the second elastic element 34. After adjusting the seat 21 to the desired position, releasing the control unit 32 causes it to reset under the action of the first elastic element 33, and the rotating shaft 31 inserts into the positioning hole 112 under the action of the second elastic element 34.

[0068] In this embodiment, a guide slope 322 is provided on the first abutting part 321. During the sliding process of the control part 32, the guide slope 322 abuts against the second abutting part 311. As the control part 32 slides, the second abutting part 311 moves away from the positioning hole 112 under the action of the guide slope 322, thereby driving the rotating shaft 31 to disengage from the positioning hole 112.

[0069] A rotating shaft 31 is disposed on one side of the second abutment portion 311, and a second elastic member 34 is disposed on the other side of the second abutment portion 311. A partial control portion 32 is located between the rotating shaft 31 and the positioning hole 112. The control portion 32 has a clearance hole 323, and the rotating shaft 31 passes through the clearance hole 323 to avoid interference between the control portion 32 and the rotating shaft 31. The second abutment portion 311 is located outside the clearance hole 323, and a guide slope 322 is located on one side of the clearance hole 323.

[0070] Part of the control section 32 protrudes from the front of the seat section 21, facilitating operation by the user. When the position of the seat section 21 needs to be adjusted, pulling the control section 32 forward will drive the rotating shaft 31 to slide out of the positioning hole 112 and release the seat section 21. The control section 32 may be provided with a groove or a handle for easy pulling.

[0071] In this embodiment, two rotating shafts 31 are provided, and the two rotating shafts 31 share a single control unit 32. The control unit 32 is U-shaped and includes two side arms spaced apart and a support arm connected between the two side arms. Each side arm is provided with a first abutment part 321 for engaging with a rotating shaft 31. A first elastic member 33 is disposed between the support arm and the seat part 21.

[0072] The seat portion 21 is also provided with a housing 35, within which the second elastic element 34 and part of the control part 32 are located. The pivot 31 can extend or retract relative to the housing 35. The housing 35 is detachably connected to the seat portion 21 for easy installation, disassembly, and maintenance. The housing 35 can be formed by two interlocking parts for easy component installation. The first elastic element 33 and the second elastic element 34 can be springs, elastic pads, or other elastic structures.

[0073] In this embodiment, the bottom of the seat portion 21 is recessed to form a receiving groove for accommodating the control portion 32. The bottom support portion 11 includes a protruding structure 113, which is inserted into the receiving groove. See [reference needed] Figure 9 and Figure 10 The slide groove 111 and the positioning hole 112 are both provided on the protruding structure 113. The two rotating shafts 31 are distributed on the left and right sides of the protruding structure 113. The left and right sides of the protruding structure 113 are provided with slide grooves 111 and positioning holes 112, that is, one slide groove 111 and a set of positioning holes 112 are provided for each rotating shaft 31.

[0074] The rotating shaft 31 is cylindrical, and its insertion into the positioning hole 112 restricts the movement of the seat portion 21 relative to the bottom support portion 11. In some embodiments, the two rotating shafts 31 are coaxially arranged, and the rotating shafts 31 do not have a locking function. In this case, the seat portion 21 and / or the backrest 22 can be locked by other additional locking structures. For example, the child safety seat also has a locking structure for locking the seat portion 21. The locking structure is disposed between the seat portion 21 and the backrest 22, and the position locking of the two is completed by locking the relative rotation between the seat portion 21 and the backrest 22. The seat portion 21 and the backrest 22 are rotatably connected, which can be by a pin connection or by other existing rotating structures. The locking structure can include two locking pins, which are disposed in the seat portion 21 and selectively inserted into locking holes on the backrest 22. The two locking pins are not coaxial. The movement of the locking pins can be controlled by a solenoid valve.

[0075] In some embodiments, the two rotating shafts 31 are parallel and spaced apart, that is, the two rotating shafts 31 are not coaxial. When the two rotating shafts 31 are simultaneously inserted into the corresponding positioning holes 112, there are two connection points between the seat part 21 and the bottom support part 11 to prevent the seat part 21 from rotating, thereby locking the seat part 21.

[0076] In some embodiments, a locking structure is provided between the backrest 22 and the rear support portion 12. By locking the backrest 22 and then engaging the pivot 31 inserted into the positioning hole 112, the seat portion 21 and the backrest 22 can be locked. The locking structure can be an existing locking pin structure.

[0077] The child safety seat also includes a seat cushion 50 and a leg rest 60. The seat cushion 50 is located on the seat portion 21, and the leg rest 60 is located at the front end of the seat cushion 50 and is rotatably connected to it. A more comfortable riding experience can be provided by adjusting the angle between the leg rest 60 and the seat cushion 50. The seat cushion 50 can be fixedly connected to the seat portion 21.

[0078] Using the first support surface on the seat 21 for supporting the buttocks as a reference, the angle between the seat 21 and the base support 11 is the same as the angle between the first support surface and the base support 11. Similarly, using the second support surface on the backrest 22 for supporting the back of the body as a reference, the angle between the seat 21 and the backrest 22 is the same as the angle between the first and second support surfaces. The angles between the seat 21 and the base support 11, between the seat 21 and the backrest 22, and between the backrest 22 and the rear support 12 can all be changed. In other words, the angles between any two of the three components—the base 10, the seat 21, and the backrest 22—can be altered, thereby providing a more comfortable seating experience.

[0079] The angle between the seat 21 and the backrest 22 can be set according to actual needs. The angle between the seat 21 and the backrest 22 is α, and the value of α is between 125° and 150°; and / or, the angle between the backrest 22 and the vertical plane is β, and the value of β is between 40° and 70°. The angle between the leg rest 60 and the seat cushion 50 is γ, and the value of γ is between 130° and 150°.

[0080] When the seat 21 is adjusted relative to the base support 11, the angle between the backrest 22 and the vertical plane is 70° and the angle between the seat 21 and the backrest 22 is 145°, placing the child safety seat in a zero-gravity state. In this zero-gravity state, the child safety seat can meet the support requirements of the three main parts: the feet, thighs, and torso, providing sufficient and appropriate support to these three parts, distributing pressure on the back and legs, and allowing the muscles of the whole body to relax.

[0081] In this embodiment, four positioning holes 112 are provided, each corresponding to one of the four positions. When the seat 21 is in the first position, the seat 21 is in a seated state, such as... Figure 11 and Figure 12 As shown, the backrest 22 is in its most upright position, the support shaft 40 is located at the top of the guide groove 121, the angle β between the backrest 22 and the vertical plane is 40°, the angle α between the seat 21 and the backrest 22 is 128°, and the angle γ between the leg rest 60 and the seat cushion 50 is 130°. When the seat 21 is in the fourth position, the seat 21 is in a reclining state, as shown... Figure 13 and Figure 14 As shown, the backrest 22 is in the most reclined position, the support shaft 40 is located at the bottom of the guide groove 121, the angle β between the backrest 22 and the vertical plane is 70°, the angle α between the seat part 21 and the backrest 22 is 145°, and the angle γ between the leg rest 60 and the seat cushion 50 is 150°.

[0082] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A child safety seat, characterized in that, include: The base includes a bottom support portion and a rear support portion disposed on the bottom support portion; The seat body includes a seat portion and a backrest rotatably connected to the seat portion. The seat portion is adjustablely disposed on the bottom support portion and has a sitting position and a reclining position. When transitioning from a sitting position to a lying position, the seat portion moves away from the rear support portion, and the rear side of the seat portion is raised.

2. The safety seat according to claim 1, characterized in that, The seat portion and the bottom support portion are slidably disposed, and the seat portion and the bottom support portion are rotatable relative to each other; When lying down, the backrest is supported on the rear support.

3. The safety seat according to claim 2, characterized in that, One of the seat portion and the bottom support portion is provided with a rotating shaft, and the other is provided with a sliding groove that slides with the rotating shaft and a plurality of positioning holes recessed from the bottom of the sliding groove. The rotating shaft moves along the axial direction to a first position and a second position. In the first position, the rotating shaft moves into the positioning hole to restrict the rotating shaft from sliding along the slide groove. In the second position, the rotating shaft disengages from the positioning hole so that the rotating shaft can slide along the slide groove.

4. The safety seat according to claim 3, characterized in that, The groove is provided on the bottom support and extends in the front-to-back direction, and the plurality of positioning holes are arranged on the bottom support in the front-to-back direction; The pivot is movably mounted on the seat, and the seat is also provided with a control unit for controlling the movement of the pivot.

5. The safety seat according to claim 4, characterized in that, The control unit is slidably connected to the seat in the front-back direction. The control unit includes a first abutment and a second abutment is provided on the rotating shaft. At least one of the first abutment and the second abutment has a guide slope. During the sliding process of the control unit, the first abutment and the second abutment abut each other, and the guide slope guides the rotating shaft to disengage from the positioning hole.

6. The safety seat according to claim 3, characterized in that, The safety seat also has a locking structure for locking the seat portion, which is disposed between the seat portion and the backrest, and the position of the two is locked by locking the relative rotation between the seat portion and the backrest.

7. The safety seat according to claim 6, characterized in that, The locking structure includes two locking pins, which are disposed on the seat portion and selectively inserted into the locking holes on the backrest. The two locking pins are not coaxial.

8. The safety seat according to claim 2, characterized in that, The backrest and the rear support can rotate and slide relative to each other, and the connection position between the backrest and the rear support is close to the top of the rear support. When transitioning from a sitting to a lying position, the bottom of the backrest rotates away from the rear support and the backrest slides downward relative to the rear support.

9. The safety seat according to claim 8, characterized in that, The rear support is provided with a guide groove, and the backrest is provided with a support shaft that is slidably connected to the guide groove. The backrest can rotate around the axis of the support shaft.

10. The safety seat according to claim 8, characterized in that, When the seat is adjusted relative to the bottom support, the angle between the backrest and the vertical plane is 70° and the angle between the seat and the backrest is 145°, and the safety seat is in a zero-gravity state.

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