Baby carriage with backrest adjustment

Abstract

This utility model discloses a baby stroller with an adjustable backrest, including a first support leg, a second support leg, and a seat. The first support leg, the second support leg, and the seat are rotatably connected by a connector. The first and second support legs are located below the seat. One end of the seat is rotatably connected to the bottom of the backrest through an internally installed stepless adjustment component. A sliding support is slidably connected to the outer wall of the first support leg, and a push rod is rotatably connected to one end of the second support leg. This utility model features a 0°-180° stepless adjustment backrest with a locking structure, adapting to the needs of all age groups, including younger children lying flat and older children sitting. The footrest height and push rod length are also adjustable in multiple positions and are easy to operate. The sunshade can be unfolded and folded according to multiple internal arc-shaped frames and is precisely positioned by a 120° turning limit groove in the connector, forming a stable triangular structure between the first and second support legs and the ground. Combined with the figure-eight-shaped second support leg, the anti-tipping ability is significantly enhanced.

Description

Technical Field

[0001] This utility model mainly relates to the field of children's stroller technology, specifically a baby stroller with adjustable backrest. Background Technology

[0002] A stroller is a means of transportation specifically designed for infants and toddlers. It is mainly used by parents or guardians to take children out. It has functions such as pushing and sitting, and usually has a frame, wheels, seat, backrest and other structures. It can provide a safe and comfortable riding environment for children, while being easy for adults to operate.

[0003] Traditional strollers often use parallel support legs, which have an uncontrollable unfolding angle. This makes the stroller prone to tipping over on bumpy roads or when subjected to lateral thrust. In addition, some strollers with adjustable backrest angles often have 3-4 fixed angles of 170°, 145°, and 110°, and the backrests lack breathability, which can easily induce skin problems such as eczema, especially in summer. Utility Model Content

[0004] This utility model addresses the problem of overly simplistic solutions in existing technologies by providing an adjustable backrest stroller. This solution addresses the issues raised in the background section, such as the inability to precisely control the unfolding angle of parallel support legs, the risk of tipping over due to an unstable support base, and the safety hazards posed by the use of solid sponge or leather backrests which can easily cause eczema and prickly heat during prolonged exposure in summer.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] An adjustable backrest baby stroller, wherein the first support leg, the second support leg and the seat are rotatably connected by a connector, the first support leg and the second support leg are located below the seat, one end of the seat is rotatably connected to the bottom of the backrest through a stepless adjustment component provided inside it, the outer wall of the first support leg is slidably connected to a sliding brace, and one end of the second support leg is rotatably connected to a push rod.

[0007] One end of the sliding support is rotatably connected to a footrest via a damping hinge, and the other end of the sliding support slides on the outer wall of the first support leg via a slider. A limit wedge is movably connected to the outside of the slider, and a lever is slidably connected in the groove between the sliders. The bottom of the lever is connected to the limit wedge via a spring.

[0008] The stepless adjustment assembly includes an external gear ring and an internal gear ring, with two sets of each. The external gear ring is fixed to both ends inside the seat plate. Each set of internal gear rings meshes with the corresponding external gear ring and is rotatably connected to both ends inside the seat plate via bearings. One end of each internal gear ring is fixed to one side of the back plate. One end of one set of internal gear rings located on the outer wall of the seat plate is rotatably connected to a limiting disc. A stud at the center of the limiting disc is threaded to a threaded groove on the outer wall of the seat plate, and the other end of the stud is threaded to one end of the internal gear ring, which is used to limit the circumferential rotation of the internal gear ring. An annular anti-detachment component is fixedly connected to the surface of the limiting disc. The anti-detachment component is arranged around the outer circumference of the internal gear ring to prevent the internal gear ring from axially dislodging from the seat plate.

[0009] Furthermore, the outer wall of the receiving component is provided with directional limiting grooves at 120° equidistant angles based on its axis, which are used to rotatably connect the first support leg, the second support leg and the seat plate. When the first support leg and the second support leg are extended to their maximum angle, they form a triangular support structure with the ground. The length of the first support leg is greater than the length of the second support leg, and the second support leg is composed of two V-shaped rods.

[0010] Furthermore, the first support leg has a slot at the position of the corresponding limiting wedge for inserting the limiting wedge and restricting the position of the footrest. Several slots are evenly spaced along the length of the first support leg, and a return spring is connected between the limiting wedge and the lever. The two ends of the return spring are fixed to the limiting wedge and the lever, respectively, so that the limiting wedge can move in and out of the slot.

[0011] Furthermore, the bottom of the push rod is provided with a ball head, and the top seat of the second support leg is provided with a ball socket adapted to the ball head. A threaded hole is provided on one side of the outer wall of the top seat, and an annular threaded groove is provided on the outer circumferential surface of the ball head. The limiting bolt passes through the threaded hole and is threadedly connected to the annular threaded groove to limit the rotation of the ball head.

[0012] Furthermore, the push rod is internally slidably connected to an extension rod, and the outer wall of the extension rod is provided with a cavity for installing a spring near the bottom. One end of the spring is fixedly connected to a semi-circular protrusion, so that the semi-circular protrusion can move in and out along the radial direction of the extension rod. The outer wall of the push rod is provided with several circular slots that are adapted to the semi-circular protrusion at equal intervals along the circumference.

[0013] Furthermore, the anti-detachment component is annular and has a through hole in the middle. The inner diameter of the through hole is larger than the outer diameter of the stud that connects the surface of the limiting plate to the internal gear ring. The anti-detachment component is spaced a certain distance from the limiting plate body. An annular cavity for rotatably connecting the anti-detachment component is opened in the base plate. The axial depth of the annular cavity is greater than the axial displacement corresponding to the maximum number of rotations required for the threaded connection between the limiting plate and the internal gear ring. The annular cavity is equiangularly distributed on the side near the limiting plate and is fixed with a stop block for limiting the position of the anti-detachment component.

[0014] Furthermore, a sunshade is rotatably connected to the top of the backrest, and the sunshade is a support structure composed of several arc-shaped frames. A flexible sunshade cloth is sleeved on the outside of the arc-shaped frames. The backrest can rotate and lock relative to the seat plate within the range of 0° to 180° through a stepless adjustment component, forming a foldable structure. A connecting rod is provided at the bottom of the seat plate at the position corresponding to the first support leg. One end of the connecting rod rotates to the first support leg, and the other end slides in the corresponding groove at the bottom of the seat plate through a slider rotatably connected to it.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. The 120° steering limit groove of the connector ensures precise positioning, forming a stable triangular structure that effectively enhances the anti-tipping ability. The backrest is infinitely adjustable from 0° to 180° and features a locking mechanism to meet the needs of children of different ages. The footrest height and push rod length are adjustable in multiple positions for easy operation. The sunshade can be unfolded and folded to achieve dynamic adaptation of the sunshade function.

[0017] 2. The backrest surface features a through-hole structure and a high-hardness polyester fiber mesh, which improves air circulation compared to traditional solid backrests. This allows for rapid dissipation of heat and moisture from a child's back, making it especially suitable for summer or long-term sitting scenarios.

[0018] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the unfolded structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the main view of the folding structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the bottom structure of this utility model;

[0022] Figure 4 This is a partial structural diagram of the sliding support of this utility model;

[0023] Figure 5This is a partial structural diagram of the push rod of this utility model;

[0024] Figure 6 This is a schematic diagram of the stepless adjustment component of this utility model;

[0025] Figure 7 This utility model Figure 6 Enlarged schematic diagram of the structure at point A in the middle.

[0026] Numbering on the map:

[0027] 1. First support leg; 2. Second support leg; 3. Seat plate; 4. Receiving component; 5. Push rod; 501. Extension rod; 502. Semi-circular protrusion; 6. Backrest plate; 7. Sliding support; 701. Footrest; 702. Limiting wedge; 703. Pulley; 8. Stepless adjustment assembly; 801. External gear ring; 802. Internal gear ring; 803. Limiting plate; 804. Anti-slip component; 805. Stop block; 9. Connecting rod. Detailed Implementation

[0028] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0030] Please refer to the appendix carefully. Figure 1-7 A baby stroller with adjustable backrest includes a first support leg 1, a second support leg 2, and a seat 3. The first support leg 1, the second support leg 2, and the seat 3 are rotatably connected by a connector 4. The first support leg 1 and the second support leg 2 are located below the seat 3. One end of the seat 3 is rotatably connected to the bottom of the backrest 6 through a stepless adjustment component 8 provided inside it. A sliding support 7 is slidably connected to the outer wall of the first support leg 1, and a push rod 5 is rotatably connected to one end of the second support leg 2.

[0031] One end of the sliding support 7 is rotatably connected to the foot support 701 via a damping hinge, and the other end of the sliding support 7 slides on the outer wall of the first support leg 1 via a slider. A limit wedge 702 is movably connected to the outside of the slider, and a lever 703 is slidably connected in the groove between the sliders. The bottom of the lever 703 is connected to the limit wedge 702 via a spring.

[0032] The stepless adjustment assembly 8 includes an outer gear ring 801 and an inner gear ring 802. Two sets of outer gear rings 801 and inner gear rings 802 are provided. The outer gear rings 801 are fixed to both ends inside the seat plate 3. Each set of inner gear rings 802 meshes with the corresponding outer gear rings 801 and is rotatably connected to both ends inside the seat plate 3 through bearings. One end of the inner gear rings 802 is fixed to one side of the back plate 6. One end of one set of inner gear rings 802 located on the outer wall of the seat plate 3 is rotatably connected to a limiting disk 803. The stud at the axis of the limiting disk 803 is threadedly connected to the threaded groove on the outer wall of the seat plate 3, and the other end of the stud is threadedly connected to one end of the inner gear ring 802 to limit the circumferential rotation of the inner gear ring 802. An annular anti-detachment member 804 is fixedly connected to the surface of the limiting disk 803. The anti-detachment member 804 is arranged around the outer periphery of the inner gear ring 802 to prevent the inner gear ring 802 from axially detaching from the seat plate 3.

[0033] Since the outer gear ring 801 is fixed, the meshing action of the inner gear ring 802 and the outer gear ring 801 causes the back plate 6 to rotate relative to the seat plate 3 to the required angle, and after the back plate 6 rotates to a specific position, it is locked by the threaded connection of the limit plate 803.

[0034] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the outer wall of the receiving part 4 is provided with a steering limiting groove at 120° equidistant angles based on its axis, which is used to rotatably connect the first support leg 1, the second support leg 2 and the seat plate 3. When the first support leg 1 and the second support leg 2 are extended to the maximum angle, they form a triangular support structure with the ground. The length of the rod of the first support leg 1 is greater than the length of the rod of the second support leg 2, and the second support leg 2 is composed of two rods in a figure-eight shape.

[0035] The steering limiting grooves on the outer wall of the receiving part 4 are distributed at 120° equal angles, providing precise rotation fulcrums for the first support leg 1, the second support leg 2 and the seat plate 3, ensuring that the three automatically form a stable triangular support structure when unfolded, avoiding the risk of tipping over due to angle deviation, and guiding the three to fold along a preset trajectory when folded, realizing the two-way function of unfolding and folding.

[0036] In this embodiment, as Figure 4 As shown, the first support leg 1 has a slot at the position of the corresponding limiting wedge 702 for the limiting wedge 702 to be inserted and to limit the position of the footrest 701. Several slots are provided at equal intervals along the length of the first support leg 1. A return spring is connected between the limiting wedge 702 and the lever 703. The two ends of the return spring are fixed to the limiting wedge 702 and the lever 703 respectively, so that the limiting wedge 702 can move in and out of the slot.

[0037] The slots are evenly distributed along the length of the first support leg 1. By inserting the limiting wedge 702 into different slots, the height of the footrest 701 can be adjusted in multiple positions to accurately match the leg length of children of different ages. The lever 703 is linked with the reset spring. Squeezing the lever 703 will drive the limiting wedge 702 to disengage from the slot. After releasing, it will automatically reset and lock. The adjustment process does not require tools and is suitable for quick operation when taking care of a child.

[0038] In this embodiment, as Figure 5 As shown, the bottom of the push rod 5 is provided with a ball head, and the top seat of the second support leg 2 is provided with a ball socket that matches the ball head. A threaded hole is provided on one side of the outer wall of the top seat, and an annular threaded groove is provided on the outer circumferential surface of the ball head. The limiting bolt passes through the threaded hole and is threadedly connected to the annular threaded groove to limit the rotation of the ball head.

[0039] The limit bolt is threaded to the annular threaded groove. When tightened, it restricts the rotation of the ball head to fix the position of the push rod 5. When loosened, it can be flipped over, and at the same time, the push rod 5 can be folded and retracted.

[0040] In this embodiment, as Figure 5 As shown, the push rod 5 has an extension rod 501 slidably connected inside, and the outer wall of the extension rod 501 is provided with a cavity for installing a spring near the bottom. One end of the spring is fixedly connected to the semi-circular protrusion 502, so that the semi-circular protrusion 502 can move in a radial direction along the extension rod 501. The outer wall of the push rod 5 is provided with a number of circular slots that are adapted to the semi-circular protrusion 502 at equal intervals along the circumference.

[0041] The extension rod 501, in conjunction with the semi-circular protrusion 502 and the circular slot, allows for multiple height adjustments to accommodate the needs of adults of different heights. The spring-driven semi-circular protrusion 502 automatically engages with the slot, and pressing the semi-circular protrusion 502 unlocks and adjusts the height, making it easy to operate.

[0042] In this embodiment, as Figure 6 and Figure 7 As shown, the anti-detachment component 804 is annular and has a through hole in the middle. The inner diameter of the through hole is larger than the outer diameter of the stud that connects the surface of the limiting plate 803 and the internal gear ring 802. The anti-detachment component 804 is spaced a certain distance from the plate body of the limiting plate 803. An annular cavity for rotatably connecting the anti-detachment component 804 is opened in the seat plate 3. The axial depth of the annular cavity is greater than the axial displacement corresponding to the maximum number of rotations required for the threaded connection and disconnection of the limiting plate 803 and the internal gear ring 802. The annular cavity is equiangularly distributed on the side near the limiting plate 803 and is fixed with a stop 805 for limiting the position of the anti-detachment component 804.

[0043] The annular structure prevents the internal gear ring 802 from axially dislodging and does not interfere with the threaded installation and removal adjustment of the limiting plate 803. The spacing design of the limiting plate 803, combined with the depth of the annular cavity in the seat plate 3, can accommodate the axial displacement of the limiting plate 803 during threaded adjustment, ensuring that the anti-dislodgement function remains effective during the angle adjustment of the backing plate 6. Furthermore, the stop block 805 further restricts the displacement of the anti-dislodgement component 804, ensuring the stable and reliable use of the anti-dislodgement structure.

[0044] In this embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, a sunshade is rotatably connected to the top of the backrest 6, and the sunshade is a support structure composed of several arc-shaped frames. A flexible sunshade cloth is sleeved on the outside of the arc-shaped frames. The backrest 6 can rotate and lock relative to the seat plate 3 in the range of 0° to 180° through the stepless adjustment component 8 to form a foldable structure. A connecting rod 9 is provided at the bottom of the seat plate 3 at the position corresponding to the first support leg 1. One end of the connecting rod 9 rotates to the first support leg 1, and the other end slides in the corresponding groove at the bottom of the seat plate 3 through a slider rotatably connected to it.

[0045] Both the seat 3 and the backrest 6 are made of polycarbonate, which is lightweight and has high rigidity. They are covered with a high-elasticity polyester fiber sponge layer and a PU layer set outside the sponge layer. This provides comfort and prevents the sponge from collapsing. The outermost layer is easy to clean. The surface of the backrest 6 is through the spine and has a high-rigidity polyester fiber mesh for breathability.

[0046] The curved frame is rotatably connected to the top of the backrest 6, which can be adjusted according to the unfolding range to meet the sunshade needs of different scenarios such as lying down and sitting. The backrest 6 can be locked at any angle from 0° to 180° through the stepless adjustment component 8, which supports multiple scenarios such as lying down for younger children and sitting for older children. At the same time, it can be folded to fit the seat 3, and the volume is compact when folded. The connecting rod 9 at the bottom of the seat 3 and the first support leg 1 help the seat 3 to flip smoothly when folded, and enhance the stability of the triangular support structure when unfolded.

[0047] The specific operating procedure of this utility is as follows: using the straps sewn on the seat plate 3 and the backrest plate 6, fasten the male and female buckles of the buckle, wrap it around the child's body, and pull the D-ring buckle that passes through the strap according to the child's body shape. Adjust the length by moving the position of the strap in the hole to avoid it being too loose and slipping off.

[0048] Adjust the angle of the backrest 6 according to the child's age, rotate the limiting plate 803 to disengage its stud from the internal gear ring 802, push the backrest 6 to the appropriate angle, and after the position adjustment is completed, rotate the limiting plate 803 in the opposite direction again. Use the threaded structure to fix the internal gear ring 802 to the corresponding threaded opening of the seat plate 3. During this process, support the backrest 6 to avoid displacement until the limiting plate 803 is tightened. The anti-disengagement part 804 rotates in the corresponding annular cavity of the seat plate 3, which can prevent the limiting plate 803 from axially disengaging.

[0049] For younger children, the backrest 6 can be adjusted to a slightly reclining angle of 165°-175° or a semi-reclining angle of 135°-150°. For older children, it can be adjusted to a sitting angle of 90°-110°.

[0050] Based on the child's leg length, the footrest 701 is positioned, and the thumb and forefinger squeeze the lever 703 to drive the limiting wedge 702 to retract into the slider against the spring force, disengaging it from the groove of the first support leg 1.

[0051] Simultaneously, the footrest 701 is held and slid up and down along the outer wall of the first support leg 1. The pressure on the lever block 703 is released according to the position, so that the limiting wedge block 702 and the corresponding slot are engaged. The lever block 703 is released, and the reset spring pushes the limiting wedge block 702 into the slot.

[0052] The extended length of the extension rod 501 can be adjusted according to the height of the adult being pushed from behind. One hand uses the thumb and forefinger to squeeze the semi-circular protrusion 502 to retract it into the cavity of the extension rod 501 and disengage it from the circular slot of the push rod 5. The other hand pulls the extension rod 501 upward until it is adjusted into the appropriate circular slot.

[0053] When the trolley is folded up, firstly, the semi-circular protrusion 502 is squeezed to completely slide the extension rod 501 into the push rod 5, and the protrusion is inserted into the bottom slot. Secondly, the limit plate 803 is turned counterclockwise to unlock, and the backrest 6 is folded to fit the top of the seat plate 3. The limit plate 803 is temporarily tightened clockwise to prevent shaking.

[0054] Loosen the limiting bolts on the top seat of the second support leg 2, and flip the push rod 5 around the ball socket inside the second support leg 2 to the space between the two rods of the second support leg 2.

[0055] The seat plate 3 is flipped upwards, and the slider at its bottom, which is rotatably connected to the connecting rod 9, slides from the front end of the slide groove to the rear end. The connecting rod 9 rotates with the slider, and the seat plate 3 fits against the surface of the first support leg 1.

[0056] At the same time, both hands hold the first support leg 1 and the second support leg 2 and squeeze them inward. The limiting groove provided by the receiving part 4 can guide the first support leg 1 and the second support leg 2 to rotate until the width of the first support leg 1 and the second support leg 2 becomes smaller after they are closed.

[0057] Both the first support leg 1 and the second support leg 2 are equipped with casters. The second support leg 2 is equipped with a locking caster with a locking structure. When necessary, the locking structure can be used to fix the rotation of the caster, so that the trolley can be parked stably.

[0058] When the sunshade is needed, gently pull the edges of the sunshade with both hands. The multiple curved frames inside will unfold in sequence as the stretching action is performed, and the flexible sunshade fabric will unfold to form a complete sunshade surface to block the sun from the child. When the stroller needs to be folded up, hold the mounting point of the sunshade and the back panel 6 and flip it upwards. The sunshade will then fold and be stored behind the back panel 6 without taking up extra space.

[0059] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A baby stroller with adjustable backrest, comprising a first support leg (1), a second support leg (2), and a seat (3), characterized in that: The first support leg (1), the second support leg (2) and the seat plate (3) are rotatably connected by a connector (4). The first support leg (1) and the second support leg (2) are located below the seat plate (3). One end of the seat plate (3) is rotatably connected to the bottom of the backrest (6) through a stepless adjustment component (8) provided inside it. The outer wall of the first support leg (1) is slidably connected with a sliding brace (7). One end of the second support leg (2) is rotatably connected with a push rod (5). One end of the sliding support (7) is rotatably connected to a footrest (701) via a damping hinge. The other end of the sliding support (7) slides on the outer wall of the first support leg (1) via a slider. A limiting wedge (702) is movably connected to the outside of the slider. A lever (703) is slidably connected in the groove between the sliders. The bottom of the lever (703) is connected to the limiting wedge (702) via a spring. The continuously variable adjustment assembly (8) includes an external gear ring (801) and an internal gear ring (802). Two sets of the external gear ring (801) and internal gear ring (802) are provided. The external gear ring (801) is fixed to both ends inside the seat plate (3). Each set of internal gear rings (802) meshes with the corresponding external gear ring (801) and is rotatably connected to both ends inside the seat plate (3) via bearings. One end of each internal gear ring (802) is fixed to one side of the back plate (6). One set of internal gear rings (802) is located on the seat plate (6). 3) One end of the outer wall is rotatably connected to a limiting disk (803). The stud at the center of the limiting disk (803) is threadedly connected to the threaded groove of the outer wall of the seat plate (3), and the other end of the stud is threadedly connected to one end of the internal gear ring (802) to restrict the circumferential rotation of the internal gear ring (802). The surface of the limiting disk (803) is fixedly connected to an annular anti-detachment component (804). The anti-detachment component (804) is arranged around the outer periphery of the internal gear ring (802) to prevent the internal gear ring (802) from axially dislodging from the seat plate (3).

2. The adjustable backrest baby stroller according to claim 1, characterized in that: The outer wall of the receiving part (4) is provided with a steering limiting groove at 120° equidistant intervals based on its axis, which is used to rotatably connect the first support leg (1), the second support leg (2) and the seat plate (3). When the first support leg (1) and the second support leg (2) are extended to the maximum angle, they form a triangular support structure with the ground. The length of the rod of the first support leg (1) is greater than the length of the rod of the second support leg (2). The second support leg (2) is composed of two rods in a figure-eight shape.

3. The backrest adjustable baby stroller according to claim 1, characterized in that: The first support leg (1) has a slot at the position of the corresponding limiting wedge (702) for the insertion of the limiting wedge (702) and to limit the position of the footrest (701). Several slots are provided at equal intervals along the length of the first support leg (1). A return spring is connected between the limiting wedge (702) and the lever (703). The two ends of the return spring are fixed to the limiting wedge (702) and the lever (703) respectively, so that the limiting wedge (702) can move in and out of the slot.

4. The adjustable backrest baby stroller according to claim 1, characterized in that: The bottom of the push rod (5) is provided with a ball head, and the top seat of the second support leg (2) is provided with a ball socket that is adapted to the ball head. A threaded hole is provided on one side of the outer wall of the top seat, and an annular threaded groove is provided on the outer circumferential surface of the ball head. The limiting bolt passes through the threaded hole and is threadedly connected to the annular threaded groove to limit the rotation of the ball head.

5. A baby stroller with an adjustable backrest according to claim 1, characterized in that: The push rod (5) is internally slidably connected to an extension rod (501), and the outer wall of the extension rod (501) is provided with a cavity for installing a spring near the bottom. One end of the spring is fixedly connected to a semi-circular protrusion (502), so that the semi-circular protrusion (502) can move in the radial direction of the extension rod (501). The outer wall of the push rod (5) is provided with several circular slots that are adapted to the semi-circular protrusion (502) at equal intervals along the circumference.

6. A baby stroller with an adjustable backrest according to claim 1, characterized in that: The anti-detachment component (804) is annular and has a through hole in the middle. The inner diameter of the through hole is larger than the outer diameter of the stud that connects the surface of the limiting plate (803) and the internal gear ring (802) threadedly. The anti-detachment component (804) is spaced a certain distance from the plate body of the limiting plate (803). An annular cavity for rotating connection of the anti-detachment component (804) is opened in the seat plate (3). The axial depth of the annular cavity is greater than the axial displacement corresponding to the maximum number of rotations required for the threaded connection and disconnection of the limiting plate (803) and the internal gear ring (802). The annular cavity is equiangularly distributed on the side near the limiting plate (803) and is fixed with a stop (805) for limiting the position of the anti-detachment component (804).

7. A baby stroller with an adjustable backrest according to claim 1, characterized in that: The top of the backrest (6) is rotatably connected to a sunshade, and the sunshade is a support structure composed of several arc-shaped frames. A flexible sunshade cloth is sleeved on the outside of the arc-shaped frames. The backrest (6) can rotate and lock relative to the seat plate (3) in the range of 0° to 180° through the stepless adjustment component (8) to form a foldable structure. The bottom of the seat plate (3) is provided with a connecting rod (9) at the position corresponding to the first support leg (1). One end of the connecting rod (9) rotates on the first support leg (1), and the other end slides in the corresponding groove at the bottom of the seat plate (3) through a slider rotatably connected to it.

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