Baby stroller

Abstract

A baby stroller, comprising a stroller frame, which has an unfolded state and a folded state and comprises a front support (11), a rear support (12) and a push rod assembly (13), an upper portion of the front support being rotatably connected to an upper portion of the rear support, and a lower portion of the push rod assembly being slidably connected to the upper portion of the front support. The baby stroller further comprises a seat assembly, which is arranged on the stroller frame and comprises a seat frame (2), a drawstring (42) and a cloth cover (41), wherein in the unfolded state, the drawstring is supported between the seat frame and the push rod assembly, the cloth cover is arranged between the drawstring and the seat frame, and the cloth cover and the seat frame enclose a carrier space that is open toward the front. The drawstring of the baby stroller is elastic and thus does not affect the unfolding operation of the baby stroller, so that the unfolding operation of the baby stroller is time-saving and labor-saving.

Description

A children's stroller Technical Field

[0001] This invention relates to the field of children's products technology, specifically to a children's stroller. Background Technology

[0002] When the Little Tiger cloth stroller is opened, the locking mechanism of the stroller frame is difficult to lock when the push rod assembly is pulled to a certain extent. The operator needs to go around to the front of the stroller frame and apply a downward force to the seat rod to tighten the rope before the stroller frame can be fully locked. This method of operation is relatively cumbersome.

[0003] To ensure the rigidity of the entire stroller, the ropes securing the fabric cover are stretched very tight. When the stroller frame is extended to a certain extent, the ropes have reached their theoretical length. Because the ropes themselves have a certain degree of elasticity, in order to fully extend the stroller frame and lock the locking mechanism in place, it is necessary to overcome this elasticity of the ropes. At this point, a lot of force is required to fully extend the stroller frame, which makes the stroller frame extension operation inconvenient, time-consuming and laborious. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a children's stroller that allows for the tightening of the fabric cover by a pull cord and saves time and effort when the stroller frame is unfolded.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A stroller includes a stroller frame having an unfolded state and a folded state. The stroller frame includes a front support, a rear support, and a push rod assembly. The upper part of the front support is rotatably connected to the upper part of the rear support, and the push rod assembly is slidably connected to the front support. The stroller also includes a seat assembly disposed on the stroller frame. The seat assembly includes a seat frame, a pull cord, and a fabric cover. In the unfolded state, the pull cord is supported between the seat frame and the push rod assembly, and the fabric cover is disposed between the pull cord and the seat frame. The fabric cover and the seat frame form a forward-opening load-bearing space.

[0007] In some embodiments, during the unfolding of the stroller from a folded state, the push rod assembly is in the unfolded position before the rear support;

[0008] When the push rod assembly is fully extended, the pull rope is in a pre-tensioned state; when the rear bracket rotates relative to the front bracket to the extended position, the rear bracket drives the pull rope to a tensioned state.

[0009] In some embodiments, the first end of the pull rope is fixedly mounted on the base, the pull rope extends upward around the upper part of the push rod assembly and then extends downward to cooperate with the rear bracket, so as to move and tension the pull rope when the rear bracket moves toward the unfolded state.

[0010] In some embodiments, the upper part of the rear bracket is provided with a bracket winding portion that can slide relative to the pull rope. After the pull rope passes around the upper part of the push rod assembly, it extends downward and passes around the bracket winding portion. The second end of the pull rope is fixedly mounted on the seat frame.

[0011] Alternatively, the pull rope may be wrapped around the upper part of the push rod assembly and then extended downward so that the second end of the pull rope is fixedly disposed on the upper part of the rear bracket.

[0012] In some embodiments, the rear bracket is rotatably connected to the front bracket about a first axis, and a portion of the rear bracket extends upward to the front and above the first axis to form an extension, with the bracket wrapping portion disposed on the extension.

[0013] In some embodiments, the first end of the pull rope is fixedly disposed at the front of the seat frame, the rear of the seat frame is provided with a seat frame winding portion that can slide relative to the pull rope, and the upper part of the push rod assembly is provided with a push rod winding portion that can slide relative to the pull rope; after the pull rope passes through the push rod winding portion, the seat frame winding portion and the bracket winding portion in sequence, the second end of the pull rope is fixedly disposed on the seat frame; or, after the pull rope passes through the push rod winding portion and the seat frame winding portion in sequence, the second end of the pull rope is fixedly disposed at the upper part of the rear bracket.

[0014] In some embodiments, the push rod surrounding portion is rotatably disposed on the push rod assembly, the seat surrounding portion is rotatably disposed on the seat frame, and the bracket surrounding portion is rotatably disposed on the rear bracket.

[0015] In some embodiments, one or more of the push rod winding portion, the bracket winding portion, and the seat winding portion can slide relative to the component on which they are disposed to adjust their position.

[0016] In some embodiments, the stroller further includes a drive member for sliding one or more of the push rod winding portion, the bracket winding portion, and the seat frame winding portion. The drive member is rotatably or slidably disposed on the component on which the push rod winding portion, the bracket winding portion, or the seat frame winding portion is disposed, and the drive member cooperates with the push rod winding portion, the bracket winding portion, or the seat frame winding portion, respectively.

[0017] In some embodiments, the seat frame is movably disposed on the front support, and the seat assembly further includes a linkage mechanism disposed between the seat frame and the rear support, the linkage mechanism being movably connected to the rear support and the seat frame respectively; when the rear support moves closer to the front support and folds, the rear support drives the seat frame to move closer to the front support and folds through the linkage mechanism; when the rear support rotates to the unfolded position, the rear support drives the seat frame to move to the unfolded position through the linkage mechanism.

[0018] In some embodiments, when the rear support rotates toward the unfolded position, the support winding portion and the seat winding portion move away from each other to tighten the pull rope.

[0019] In some embodiments, the seat frame is rotatably connected to the front support via a second shaft, and in the unfolded state, the second shaft is disposed between the seat frame winding portion and the support winding portion.

[0020] In some embodiments, the linkage mechanism includes a connecting rod, one end of which is rotatably connected to the front of the seat frame; the other end of which is rotatably connected to the upper part of the rear support.

[0021] In some embodiments, the push rod assembly includes a push handle located at the top, the push handle including a crossbar and side bars respectively disposed at both ends of the crossbar, the rear brackets respectively disposed on the left and right sides, the pull ropes respectively disposed on the left and right sides, the first end of the pull rope on each side is fixedly disposed on the corresponding side of the seat frame, and after sequentially moving around the side bar on the corresponding side and the upper part of the rear bracket on the corresponding side, the second end of the pull rope is fixedly disposed on the corresponding side of the seat frame; or, the first end of the pull rope on each side is fixedly disposed on the corresponding side of the seat frame, and after moving around the side bar on the corresponding side, the second end of the pull rope is fixedly disposed on the upper part of the rear bracket on the corresponding side.

[0022] In some embodiments, the stroller further includes a handle that is detachably mounted on the fabric cover.

[0023] In some embodiments, the handrail is made of a rigid material, the fabric cover is provided with a mounting portion, the mounting portion is provided with a insertion groove, and the handrail has an insertion portion that mates with the insertion groove.

[0024] In some embodiments, the fabric cover has a pair of side surfaces disposed on opposite sides of the carrying space, and each side surface is provided with the mounting portion.

[0025] In some embodiments, the side has a bottom edge disposed on the seat, and the length of the bottom edge of the side extending in the front-back direction is approximately equal to the length of the seat extending in the front-back direction; the push rod has a push handle, and the top of the side is disposed on the push handle;

[0026] The mounting part is located near the bottom edge of the side, and the direction in which the mounting part extends intersects the bottom edge at an angle, with one end of the mounting part extending towards the rear end of the seat.

[0027] In some embodiments, the side also has an inclined side extending from the front end of the push handle and the seat, and the other end of the mounting portion extends to the inclined side; the inclined side is disposed on the pull cord, and the other end of the mounting portion is disposed on the pull cord.

[0028] In some embodiments, the front support includes a front support rod and a first connector fixedly disposed on the upper part of the front support rod, the rear supports are respectively disposed on the left and right sides, the upper part of the rear support on each side is rotatably connected to the corresponding side of the first connector, and the lower part of the push rod assembly is rotatably or slidably connected to the upper part of the front support rod.

[0029] In some embodiments, the push rod assembly includes an upper push rod and a lower push rod, the lower part of the upper push rod being slidably connected to the upper part of the lower push rod, and the lower part of the lower push rod being slidably connected to the upper part of the front support rod, wherein the front support rod, the lower push rod, and the upper push rod are all arc-shaped.

[0030] In some embodiments, the front support rod, the lower push rod, and the upper push rod all arch in a direction away from the seat frame, and the radius of curvature of the arc is 0.3 to 5 m.

[0031] In some embodiments, the radius of curvature of the arc is 0.4 to 1 m.

[0032] In some embodiments, when the stroller is in the unfolded state, the center of the seat frame is 0.25-0.55m above the ground.

[0033] In some embodiments, when the stroller is in the unfolded state, the center of the seat frame is 0.3-0.45m above the ground.

[0034] In some embodiments, the greater the height of the center of the frame above the ground, the greater the radius of curvature of the arc.

[0035] In some embodiments, when the push rod assembly slides relative to the front support to the unfolded position, the front support and the rear support rotate relative to each other to form a first angle; when the rear support is in the unfolded position, the front support and the rear support form a second angle, the second angle being greater than the first angle.

[0036] In some embodiments, the second included angle is greater than 90 degrees.

[0037] In some embodiments, a limiting part is provided on the front support, and the limiting part is disposed on the rotation path of the rear support. When the rear support rotates to abut against the limiting part, the rear support is in the unfolded position.

[0038] In some embodiments, the front support includes a front support rod and a first connector fixedly disposed on the upper part of the front support rod. The rear supports are respectively disposed on the left and right sides. The upper part of the rear support on each side is rotatably connected to the corresponding side of the first connector about a first axis. The limiting parts are respectively disposed on opposite sides of the first connector. The limiting parts on each side extend from the rear part of the first connector to the left or to the right and outward from the first connector.

[0039] In some embodiments, the stroller further includes a front wheel assembly disposed at the bottom of the front support and a rear wheel assembly disposed at the bottom of the rear support. When the stroller is in a folded state, the front support and the rear support are close together, the push rod assembly slides down and folds into the front support, and the push rod assembly extends down to the lower part of the front support so that the push rod assembly, the front wheel assembly and / or the rear wheel assembly are supported on the ground.

[0040] In some embodiments, the front wheel assembly is rotatably mounted at the bottom of the front support about a pivot extending in the vertical direction. When the stroller is folded, the lowest point of the rear wheel assembly is located below the lowest point of the front wheel assembly, and the lower parts of the rear wheel assembly and the push rod assembly are supported on the ground together.

[0041] The front support and the push rod assembly are both located in the middle of the stroller frame. The rear supports are located on the left and right sides of the stroller frame, and the rear wheel assemblies are located at the bottom of the rear supports on each side. When the stroller is folded, the lower parts of the rear wheel assemblies and the push rod assemblies on the left and right sides support each other on the ground. The lower parts of the rear wheel assemblies and the push rod assemblies on the left and right sides are connected sequentially to form a triangular structure.

[0042] In some embodiments, the push rod assembly includes a lower push rod and an upper push rod, the upper push rod being slidably disposed on the lower push rod along the length extension direction of the lower push rod, and the lower push rod being slidably disposed on the front bracket along the length extension direction of the front bracket. The push rod assembly further includes a locking member for locking the relative positions of the upper push rod and the lower push rod.

[0043] In some embodiments, when the stroller is in a folded state, the locking member cooperates with the front support to lock the positions of the front support and the lower push rod;

[0044] The front support has a protrusion, and the locking member has a recess that mates with the protrusion. When the stroller is folded, the protrusion engages with the recess. The locking member is rotatably mounted on the upper part of the lower push rod. The locking member can rotate relative to the lower push rod to engage the protrusion with the recess or disengage the protrusion from the recess.

[0045] In some embodiments, the stroller further includes a first locking mechanism for locking the relative positions of the front support and the lower push rod when the stroller frame is in the unfolded state, and for unlocking the first locking mechanism when the stroller is folded and the upper push rod slides relative to the lower push rod.

[0046] In some embodiments, the stroller further includes a second locking mechanism for locking the relative positions of the front support and the rear support when the stroller frame is in the unfolded state, and for unlocking the second locking mechanism when the stroller folds down and slides relative to the front support.

[0047] In some embodiments, the front support has a cavity extending along its length, and the push rod assembly is slidably disposed in the cavity along the length extension direction of the cavity, the bottom of the cavity being open; when the stroller is in the unfolded state, the lower part of the push rod assembly is located in the cavity and does not extend to the outside of the cavity; when the stroller is in the folded state, the lower part of the push rod assembly extends from the bottom of the cavity to the outside of the cavity.

[0048] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: When the stroller of the present invention is unfolded from the folded state, the push rod assembly is first slid relative to the front support to the unfolded position, and then the push rod assembly is pressed down to make the rear support and the front support rotate relative to each other to the unfolded position. When the push rod assembly slides relative to the front support to the unfolded position, the pull rope is in a pre-tensioned state. Only when the rear support rotates away from the front support to make the stroller continue to unfold is the pull rope fully tensioned. This ensures that the elasticity of the pull rope will not affect the unfolding operation of the stroller, making the entire unfolding operation of the stroller time-saving and labor-saving, operable with one hand, and convenient for the use of the stroller. Attached Figure Description

[0049] Figure 1 is a perspective view of the stroller in the unfolded state of this embodiment (viewed from front to back, with the fabric cover and armrests removed);

[0050] Figure 2 is a perspective view of the stroller in the unfolded state (viewed from back to front, with the fabric cover and armrests removed);

[0051] Figure 3 is a front view of the stroller in the unfolded state of this embodiment (with the fabric cover and armrests removed);

[0052] Figure 4 is a cross-sectional view along line AA in Figure 3;

[0053] Figure 5 is a perspective view of the stroller in the unfolded state (with the armrests removed);

[0054] Figure 6 is a three-dimensional schematic diagram of the stroller in this embodiment during the unfolding process (the pull rope is in a pre-tightened state, viewed from the front to the back, with the cloth cover and armrests removed);

[0055] Figure 7 is a three-dimensional schematic diagram of the stroller in this embodiment during the unfolding process (the pull rope is in a pre-tightened state, viewed from back to front, with the cloth cover and armrests removed);

[0056] Figure 8 is a front view of the stroller in this embodiment during the unfolding process (the pull rope is in a pre-tightened state, and the cloth cover and handles are removed);

[0057] Figure 9 is a cross-sectional view along line AA in Figure 8;

[0058] Figure 10 is a partially exploded view of the stroller of this embodiment (with the fabric cover and armrests removed, the push rod can slide relative to the side rod).

[0059] Figure 11 is a partially enlarged view of point A in Figure 10;

[0060] Figure 12 is a front view of the stroller of this embodiment (with the fabric cover and armrests removed, the push rod can slide relative to the side rod, and the pull rope is in a natural state).

[0061] Figure 13 is a cross-sectional view along line AA in Figure 12;

[0062] Figure 14 is a partial enlarged view of point A in Figure 13;

[0063] Figure 15 is a front view of the stroller of this embodiment (without the fabric cover and armrests, the push rod can slide relative to the side rod, and the pull rope is in a taut state).

[0064] Figure 16 is a cross-sectional view along line AA in Figure 15;

[0065] Figure 17 is a magnified view of part A in Figure 16.

[0066] Figure 18 is a perspective view of the stroller in this embodiment after the armrests have been removed from the fabric cover;

[0067] Figure 19 is a partially enlarged view of point A in Figure 18;

[0068] Figure 20 is a three-dimensional schematic diagram of the stroller in this embodiment after the handlebars are installed on the fabric cover;

[0069] Figure 21 is a side view of the stroller in this embodiment after the handlebars are installed on the fabric cover;

[0070] Figure 22 is a three-dimensional schematic diagram (enlarged view) of the handrail in this embodiment;

[0071] Figure 23 is a three-dimensional schematic diagram of the stroller in this embodiment during the folding process (with the fabric cover, pull rope, and handle removed);

[0072] Figure 24 is a side view of the stroller in this embodiment during the folding process (with the fabric cover, pull rope, and handle removed);

[0073] Figure 25 is a perspective view of the stroller in this embodiment in a folded state (with the fabric cover, pull rope, and handlebars removed);

[0074] Figure 26 is a side view of the stroller in this embodiment in a folded state (with the fabric cover, pull rope, and handlebars removed).

[0075] Wherein: 11. Front bracket; 111. Front support rod; 112. First connecting piece; 113. Second connecting piece; 113a. Protrusion; 114. Limiting part; 12. Rear bracket; 13. Push rod assembly; 131. Upper push rod; 132. Lower push rod; 133. Push handle; 1331. Crossbar; 1332. Side rod; 1332a. Third through hole; 1332b. Guide groove; 14. Connecting rod; 15. Rear crossbar; 16. First shaft; 2. Seat frame; 21. Third connecting piece; 22. Fourth connecting piece; 23. First through hole; 24. Second through hole; 25. Second shaft; 31. Front wheel assembly; 32. Rear wheel assembly; 41. Fabric sleeve; 411. Side; 411a. Bottom edge; 411b. Top; 411c. Bevel; 42. Pull rope; 51. Push rod winding part; 511. Slot; 52. Bracket winding part; 53. Seat frame winding part; 61. Drive component; 62. Nut; 7. Handrail; 71. Insertion part; 711. Chamfered part; 8. Mounting part; 81. Insertion slot; 9. Locking component; 91. Recess. Detailed Implementation

[0076] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0077] In the following description, the directions "front," "back," "left," "right," "up," and "down" refer to Figure 4. In the figure, the left direction is "front," the right direction is "back," the upper direction is "up," and the lower direction is "down." The directions perpendicular to the paper are "left" and "right." The above definitions of directions are merely for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0078] As shown in Figures 1 to 26, the stroller of the present invention includes a stroller frame, a seat assembly disposed on the stroller frame, a front wheel assembly 31 disposed at the bottom front of the stroller frame, and a rear wheel assembly 32 disposed at the bottom rear of the stroller frame.

[0079] The trolley frame includes a front support 11, a rear support 12, and a push rod assembly 13. A front wheel assembly 31 is disposed at the lower part of the front support 11, and a rear wheel assembly 32 is disposed at the lower part of the rear support 12. The upper part of the rear support 12 is rotatably connected to the upper part of the front support 11 about a first axis 16. The lower part of the push rod assembly 13 is slidably connected to the upper part of the front support 11, allowing the push rod assembly 13 to be slidably disposed relative to the front support 11 along its length extension direction.

[0080] In this embodiment, the front support 11 includes a front support rod 111 and a first connecting member 112. The front support rod 111 is located in the middle of the stroller in the left-right direction. When the stroller frame is in the unfolded state, the front support rod 111 extends from front to back and upward. The front wheel assembly 31 is disposed at the lower part of the front support rod 111. The first connecting member 112 is fixedly disposed at the upper part of the front support rod 111. The rear supports 12 are respectively disposed on the left and right sides of the first connecting member 112. The upper part of each rear support 12 is rotatably connected to the corresponding side of the first connecting member 112 around the first axis 16. The rear wheel assemblies 32 are respectively disposed at the lower part of each rear support 12.

[0081] Preferably, the front support rod 111 has a cavity extending along its length, and the push rod assembly 13 is slidably disposed within the cavity of the front support rod 111 along the length extension direction of the cavity. Both the upper and lower ends of the cavity of the front support rod 111 are open, such that the upper part of the push rod assembly 13 extends out of the upper part of the cavity, and the lower part of the push rod assembly 13 can be retracted into the cavity or extend out of the cavity.

[0082] The push rod assembly 13 may include a single rod or a telescopic rod body, which is composed of multiple rods that are sequentially slidably connected.

[0083] In this embodiment, the telescopic rod includes an upper push rod 131 and a lower push rod 132. The lower push rod 132 has a cavity extending along its length direction, and the upper push rod 131 is slidably disposed within the cavity of the lower push rod 132 along the length extension direction of the cavity. The lower push rod 132 is slidably disposed within the cavity of the front support rod 111 along the length extension direction of the cavity, and the lower part of the lower push rod 132 can extend from the lower part of the cavity of the front support rod 111 to the outside of the cavity.

[0084] The push rod assembly 13 also includes a push handle 133, with the upper end of the telescopic rod fixedly disposed in the middle of the push handle 133. Specifically, the push handle 133 includes a horizontal bar 1331 extending in the left-right direction and side bars 1332 extending forward from the left and right ends of the horizontal bar 1331, respectively. The upper end of the upper push rod 131 is fixedly disposed in the middle of the horizontal bar 1331.

[0085] The seat assembly is designed for children to sit on. It includes a seat frame 2, which is movably mounted on the front support 11. The seat assembly also includes a linkage mechanism located between the seat frame 2 and the rear support 12, and movably connected to both the rear support 12 and the seat frame 2. When the rear support 12 folds towards the front support 11, the linkage mechanism causes the seat frame 2 to fold towards the front support 11. When the rear support 12 rotates towards the unfolded position, the linkage mechanism causes the seat frame 12 to move towards the unfolded position. Thus, during the unfolding or folding of the stroller, the rotation of the rear support 12 automatically rotates the seat frame 2 relative to the front support 11, eliminating the need for separate operation of rotating the seat frame 2 relative to the front support 11, making the folding and unfolding of the stroller convenient.

[0086] Specifically, the linkage mechanism includes a link 14. The rear part of the seat 2 is rotatably connected to the upper part of the front support 11 about the second axis 25. One end of the link 14 is rotatably connected to the upper part of the rear support 12. Specifically, a portion of the rear support 12 extends upward to the other side of the first axis 16 to form an extension, and one end of the link 14 is rotatably connected to the extension of the rear support 12; the other end of the link 14 is rotatably connected to the front part of the seat 2. In this way, a four-bar linkage is formed between the front support 11, the seat 2, the link 14, and the rear support 12, so that when the rear support 12 rotates relative to the front support 11, the seat 2 can rotate synchronously relative to the front support 11.

[0087] In this embodiment, a second connector 113 is fixedly installed on the upper part of the front support rod 111, and the second connector 113 is located above the first connector 112. Connecting rods 14 are respectively installed on the left and right sides. Third connectors 21 extending downwards from the bottom of the seat frame 2 are respectively installed on the left and right sides of the front part of the seat frame 2, and a fourth connector 22 extending downwards from the bottom of the seat frame 2 is installed in the middle of the rear part of the seat frame 2. The second connector 113 and the fourth connector 22 are rotatably connected around the second axis 25. One end of each connecting rod 14 is rotatably connected to the upper part of the corresponding rear support 12, and the other end of the connecting rod 14 is rotatably connected to the corresponding third connector 21.

[0088] The seat assembly also includes a fabric cover 41 and a pull cord 42. When the stroller is in the unfolded state, the pull cord 42 supports the seat frame 2 and the push rod assembly 13. The fabric cover 42 is positioned between the pull cord 41 and the seat frame 2, forming a forward-opening support space with the seat frame 2. When the stroller is in the unfolded state, the pull cord 42 is taut, allowing the fabric cover 41 to remain taut and wrinkle-free, resulting in an aesthetically pleasing appearance for the stroller.

[0089] Specifically, the pull cord 42 is positioned between the seat frame 2 and the side rod 1332 of the push handle 133. One end of the pull cord 42 is fixed to the seat frame 2, and the other end of the pull cord 42 is wound around the side rod 1332 and then engages with the rear support 12. During the unfolding process of the stroller from its folded state, when the push rod assembly 13 slides relative to the front support 11 to the unfolded position, the pull cord 42 is in a pre-tensioned state. The pre-tensioned state means that a small preset tension is applied to the pull cord 42, keeping it slightly taut but not reaching its maximum load-bearing capacity, as shown in Figures 4-9. This makes unfolding the push rod assembly 13 easier and allows for one-handed operation. When the push rod assembly 13 is unfolded, pressing down on the push rod assembly 13 causes relative rotation between the rear support 12 and the front support 11. When the rear support 12 is in the unfolded position, the pull cord 42 is in a taut state, meaning that the pull cord 42 bears a large tension, approaching or reaching its design load-bearing capacity, as shown in Figures 1-5. This design makes it easier to unfold the stroller from its folded state.

[0090] This embodiment provides one way of setting the pull rope 42, but the way the pull rope 42 is set is not limited to this embodiment. The specific way of setting the pull rope 42 in this embodiment is as follows:

[0091] As shown in Figures 2, 4, 7, and 9, one end of the pull rope 42 is fixedly mounted on the bottom front of the seat frame 2. The pull rope 42 extends upward from the bottom front of the seat frame 2, moves around the upper part of the side rod 1332, and then extends downward. The pull rope 42 then moves around the upper part of the rear support 12, and the other end of the pull rope 42 is fixedly mounted on the bottom rear of the seat frame 2. Alternatively, after the pull rope 42 moves around the upper part of the side rod 1332 and extends downward, it can remain stationary around the upper part of the rear support 12, with the other end directly fixed to the upper part of the rear support 12. The former solution is preferred, as it increases the travel distance of the pull rope 42 when the stroller is unfolded, making the unfolding operation of the stroller easier.

[0092] As shown in Figures 4 and 9, the stroller also includes a push rod winding part 51 and a bracket winding part 52. The push rod winding part 51 is disposed on the side rod 1332. The bracket winding part 52 is disposed on the upper part of the rear bracket 12, specifically, the bracket winding part 52 is disposed on the extension of the rear bracket 12. The pull rope 42 extends upward from the bottom of the seat frame 2, and then sequentially moves around the push rod winding part 51 and the bracket winding part 52 before being fixed to the seat frame 2.

[0093] Preferably, the push rod winding part 51 is rotatably connected to the side rod 1332, and the bracket winding part 52 is rotatably connected to the upper part of the rear bracket 12. The push rod winding part 51 and the bracket winding part 52 can be rollers or rotating shafts, as shown in Figures 4 and 9. During the unfolding of the stroller, when the pull rope 42 moves relative to the side rod 1332 and the rear bracket 12, the push rod winding part 51 can rotate relative to the side rod 1332, and the bracket winding part 52 can rotate relative to the rear bracket 12. In this way, there is rolling contact between the pull rope 42 and the push rod winding part 51, and between the pull rope 42 and the bracket winding part 52. This reduces the friction between the two, reduces the wear of the pull rope 42, and makes the movement of the pull rope 42 smoother and less prone to jamming, making the unfolding operation of the stroller easier.

[0094] After the pull rope 42 extends downwards by moving around the upper part of the side rod 1332, it can also first move around the seat 2, and then move around the upper part of the rear support 12 or be fixedly set on the upper part of the rear support 12. This can guide the direction of the pull rope 42 and make the movement of the pull rope 42 smoother.

[0095] Specifically, as shown in Figures 4 and 9, the stroller also includes a seat frame wrapping section 53. The seat frame wrapping section 53 is located at the rear of the seat frame 2, and the pull cord 42 movably wraps around it. Preferably, the seat frame wrapping section 53 is rotatably connected to the seat frame 2. The seat frame wrapping section 53 can also be a roller or a pivot. During the stroller's unfolding process, as the pull cord 42 moves relative to the seat frame 2, the seat frame wrapping section 53 can rotate relative to the seat frame 2. This creates rolling contact between the pull cord 42 and the seat frame wrapping section 53, further reducing friction between them.

[0096] When the stroller is in the unfolded state, the second shaft 25 is positioned between the seat frame winding part 53 and the bracket winding part 52.

[0097] As shown in Figures 2 and 7, a first through hole 23 is provided at the front of the seat frame 2. The first through hole 23 passes through the upper and lower end faces of the seat frame 2. The pull rope 42 extends from the fixed point at the bottom of the seat frame 2 to the left or right and to the outside of the seat frame 2, passes through the first through hole 23, then extends upwards, moves around the side rod 1332, and then extends downwards. By providing the first through hole 23 on the seat frame 2 and allowing the pull rope 42 to pass through the first through hole 23, the direction of the pull rope 42 can be guided.

[0098] As shown in Figures 2 and 7, a second through hole 24 is also provided at the bottom of the rear part of the seat frame 2. After the pull rope 42 extends downward from the side rod 1332 and passes through the second through hole 24, the pull rope 42 extends rearward and moves around the rear part of the seat frame 2. By providing a second through hole 24 on the seat frame 2 and allowing the pull rope 42 to pass through the second through hole 24, the direction of the pull rope 42 can also be guided.

[0099] In this embodiment, as shown in Figures 1, 2, and 5-7, pull ropes 42 are respectively disposed on the left and right sides, and push rod winding portions 51 are rotatably disposed on the side rods 1332 on the left and right sides respectively. Bracket winding portions 52 are rotatably disposed on the upper part of the rear bracket 12 on each side respectively. Seat frame winding portions 53 are rotatably disposed on the left and right sides of the rear part of the seat frame 2 respectively. One end of each pull rope 42 is fixedly disposed on the corresponding side of the seat frame 2, extends upward after passing through the first through hole 23, extends downward after movably winding around the push rod winding portion 51 on the corresponding side, extends backward after passing through the second through hole 24, extends forward after movably winding around the seat frame winding portion 53 on the corresponding side, extends forward after movably winding around the bracket winding portion 52 on the corresponding side, and the other end of the pull rope 42 is fixedly disposed on the corresponding side of the seat frame 2. Alternatively, the pull rope 42 can movably wind around the seat frame winding portion 51 on the corresponding side and extend forward so that its other end is directly fixedly disposed on the upper part of the rear bracket 12 on the corresponding side.

[0100] Preferably, one or more of the push rod winding part 51, the bracket winding part 52 and the seat winding part 53 can slide relative to the component on which they are set to adjust their position, so that the pull rope 42 can move synchronously to change the length of the pull rope 42, thereby adjusting the tension of the pull rope 42.

[0101] The following explanation uses the sliding of the push rod winding portion 51 relative to the side rod 1332 as an example. Specifically, as shown in Figures 10, 11, 13, 14, 16, and 17, the side rod 1332 is provided with a third through hole 1332a. After the pull rope 42 is sleeved on the push rod winding portion 51, both ends of the pull rope 42 simultaneously pass through the third through hole 1332a and extend downwards respectively. When the push rod winding portion 51 moves relative to the side rod 1332, the length of the pull rope 42 between the third through hole 1332a and the push rod winding portion 51 can be changed, thereby achieving the effect of adjusting the tension of the pull rope 42.

[0102] The push rod winding part 51 and the pull rope 42 are coupled as follows: the push rod winding part 51 is provided with a slot 511, and the pull rope 42 is movably disposed in the slot 511, as shown in Figures 13, 14, 16 and 17. This coupling method makes it difficult for the pull rope 42 to come out of the slot 511, so as to ensure that when the push rod winding part 51 moves relative to the trolley frame, it drives the pull rope 42 to move synchronously.

[0103] The side rod 1332 is also provided with a guide groove 1332b that cooperates with the push rod winding part 51. The guide groove 1332b extends along the sliding direction of the push rod winding part 51, that is, it extends along the front and back direction. The push rod winding part 51 can be slidably disposed in the guide groove 1332b along the length extension direction of the guide groove 1332b, as shown in Figures 13, 14, 16 and 17.

[0104] The third through hole 1332a communicates with the guide groove 1332b, and the third through hole 1332a can be close to the front end of the guide groove 1332b, as shown in Figures 13, 14, 16, and 17. Thus, when the push rod winding portion 51 slides backward along the guide groove 1332b, the length of the pull rope 42 between the third through hole 1332a and the push rod winding portion 51 increases, causing the pull rope 42 to tighten. Conversely, when the push rod winding portion 51 slides forward along the guide groove 1332b, the length of the pull rope 42 between the third through hole 1332a and the push rod winding portion 51 decreases, causing the pull rope 42 to slack.

[0105] Of course, the third through hole 1332a can also be set near the rear end of the guide groove 1332b. In this way, when the push rod winding part 51 slides forward along the guide groove 1332b, the pull rope 42 is tensioned; when the push rod winding part 51 slides backward along the guide groove 1332b, the pull rope 42 is relaxed.

[0106] The stroller also includes a drive unit 61, which is rotatably or slidably mounted on the side rod 1332. The drive unit 61 cooperates with the push rod winding part 51. When the drive unit 61 rotates or slides relative to the side rod 1332, the push rod winding part 51 is driven to slide and adjust its position relative to the side rod 1332 through the cooperation between the drive unit 61 and the push rod winding part 51.

[0107] The drive member 61 is rotatably mounted on the side rod 1332. By rotating the drive member 61 relative to the side rod 1332, the push rod moves around the mounting part 51 relative to the side rod 1332.

[0108] Specifically, as shown in Figures 13, 14, 16, and 17, the driving component 61 can be a screw, which is rotatably mounted on the side rod 1332 around its own axis. A nut 62 is fixedly mounted inside the push rod winding portion 51, and the screw and nut 62 are connected by a threaded connection. When the screw is operated to rotate around its own axis, the nut 62 is driven to move along the axis of the screw, thereby driving the push rod winding portion 51 to move in the same direction to adjust its position.

[0109] In other embodiments, the drive member 61 may also be slidably mounted on the trolley frame, and the drive member 61 and the push rod winding part 51 are engaged by an inclined surface.

[0110] As shown in Figures 18, 20 and 21, the stroller may also include a handle 7, which is detachably mounted on the fabric cover 41.

[0111] By installing handrails 7 on the fabric cover 41, children can be prevented from sliding out of the carrying space when they are sitting in it, thus providing safety protection for children through the handrails 7.

[0112] In addition, the armrest 7 is detachably connected to the fabric cover 41. When the armrest 7 is not in use, it can be removed from the fabric cover 41, making the stroller look simple and beautiful, and avoiding the problem that the armrest 7 connected to the fabric cover 41 may affect the use of the stroller.

[0113] The armrest 7 is made of rigid material. While preventing children from sliding out of the seat and providing safety, the armrest 7 also allows children to lean against it and sleep when tired, improving comfort and enhancing the overall aesthetics of the stroller. The armrest 7 is preferably made of rigid plastic.

[0114] The fabric cover 41 is provided with a mounting part 8, and the handrail 7 is detachably mounted on the mounting part 8. Specifically, as shown in Figures 18, 19 and 22, the mounting part 8 is provided with a insertion groove 81, and the handrail 7 has an insertion part 71. The insertion part 71 cooperates with the insertion groove 81, and the insertion part 71 can be inserted into the insertion groove 81 or disengaged from the insertion groove 81.

[0115] As shown in Figure 22, chamfered portions 711 are provided on opposite sides of the end of the plug portion 71, so as to facilitate the plug portion 71 being inserted into the plug slot 81.

[0116] The fabric cover 41 has a pair of side panels 411 respectively located on the left and right sides of the support space, and mounting parts 8 are respectively located on each side panel 411. The handrail 7 has a U-shaped structure with the opening facing backward, and the insertion parts 71 are respectively located at the two ends of the handrail 7. When the handrail 7 is installed on the fabric cover 41, the insertion parts 71 on each side are inserted into the insertion slots 81 on the corresponding side, as shown in Figures 20 and 21.

[0117] As shown in Figures 18, 20 and 21, each side 411 of the fabric cover 41 has a bottom edge 411a and a top edge 411b. The bottom edge 411a of the fabric cover 41 is located at the position of the seat 2, and the top edge 411b of the side 411 is located at the position of the side rod 1332 of the push handle 133.

[0118] The length of the bottom edge 411a of the side 411 extending in the front-back direction is approximately equal to the length of the seat frame 2 extending in the front-back direction. Here, "approximately equal" means that the two are exactly the same, or the length of the bottom edge 411a extending in the front-back direction is slightly less than the length of the seat frame 2 extending in the front-back direction.

[0119] On each side 411, the length of the side 411 extending in the front-to-back direction gradually decreases from its bottom edge 411a to its top edge 411b. A mounting portion 8 is located near the bottom edge 411a of the side 411, extending in a direction obliquely intersecting the bottom edge 411a, with one end extending towards the rear end of the seat frame 2. This increases the length of the mounting portion 8, thereby increasing the mating length between the insertion portion 71 and the insertion slot 81, resulting in better stability of the armrest 7 when mounted on the fabric cover 41, thus providing better support and safety protection for children.

[0120] As shown in Figures 18, 20, and 21, each side 411 also has a bevel 411c extending from the side bar 1332 and the front end of the seat frame 2, with at least the bevel 411c being attached to the pull rope 42. The other end of the mounting part 8 extends to the position of the bevel 411c and is attached to the pull rope 42, which improves the rigidity and stability of the handrail 7 after it is installed in the mounting part 8.

[0121] In one specific embodiment, the mounting part 8 is a rigid material component fixedly mounted on the side 411 of each side. The use of a rigid material for the mounting part 8 ensures good rigidity and stability in the connection between the handrail 7 and the mounting part 8. The mounting part 8 is preferably made of rigid plastic.

[0122] The preferred mounting part 8 is located on the side 411 facing the carrying space, which makes the stroller look neat and beautiful.

[0123] In another embodiment, the mounting part 8 can also be made of the same material as the cover 41. In this case, the mounting part 8 can be integrally made with the cover 41, or the mounting part 8 can be sewn onto the side of the cover 41 facing the bearing space. The manufacturing process of making the mounting part 8 of the same material as the cover 41 is simple and the cost is low.

[0124] The stroller also includes a locking mechanism. When the armrest 7 is installed on the mounting part 8, the relative position between the armrest 7 and the mounting part 8 is locked by the locking mechanism. The locking mechanism is respectively provided between the mounting part 8 and the insertion part 71 on each side. After both locking mechanisms are unlocked, the armrest 7 can be detached from the mounting part 8.

[0125] The locking structure is preferably located at the oblique edge 411c of the side 411 of the mounting part 8 near the cloth cover 41, which facilitates the operation of the locking structure to lock or unlock it.

[0126] The locking structure can adopt a combination of large white buckles, snaps, or other structural forms.

[0127] The push rod assembly 13 also includes a locking member 9, which is used to lock the relative positions of the upper push rod 131 and the lower push rod 132. In this embodiment, the locking member 9 is rotatably disposed on the lower push rod 132. When the locking member 9 is in the locked state, the locking member 9 abuts against the upper push rod 131, thereby offsetting the radial clearance between the upper push rod 131 and the lower push rod 132 and preventing wobbling between the upper push rod 131 and the lower push rod 132, as shown in Figures 2 and 4.

[0128] The push rod assembly 13 can also lock the axial position between the upper push rod 131 and the lower push rod 132 via an additional locking element, preventing them from sliding relative to each other. Only after the locking element 9 is unlocked can the additional locking element be unlocked, allowing the upper push rod 131 and the lower push rod 132 to slide relative to each other. This improves the safety performance of the stroller and prevents accidental unlocking of the lock between the upper push rod 131 and the lower push rod 132, thus preventing relative sliding between them.

[0129] When the stroller is in the folded state, the locking element 9 can cooperate with the front support 11 to lock the positions of the front support 11 and the lower push rod 132, so that the stroller can be in a stable folded state without automatically unfolding, as shown in Figures 25 and 26.

[0130] Specifically, the front support 11 has a protrusion 113a, and the locking member 9 has a recess 91 that mates with the protrusion 113a, as shown in Figures 1, 2, and 5-7. When the stroller is in the folded state, the locking member 9 is locked, and the protrusion 113a engages with the recess 91, thereby locking the positions of the front support 11 and the lower push rod 132, as shown in Figures 25 and 26. When the locking member 9 is unlocked by rotating relative to the lower push rod 132, the protrusion 113a disengages from the recess 91. When the locking member 9 is locked by rotating relative to the lower push rod 132, the protrusion 113a engages with the recess 91.

[0131] The stroller also includes a first locking mechanism, which locks the relative positions of the front support 11 and the lower push rod 132 when the stroller frame is in the unfolded state. When the stroller is folded, the upper push rod 131 slides relative to the lower push rod 132, which unlocks the first locking mechanism. This makes unlocking the first locking mechanism convenient, requiring no separate operation, and facilitates the folding of the stroller. The specific structure of the first locking mechanism and the structure that unlocks it can both adopt structures from the prior art.

[0132] The stroller also includes a second locking mechanism. When the stroller frame is in the unfolded state, the second locking mechanism locks the relative positions of the front support 11 and the rear support 12, thereby locking the position of the four-bar linkage formed between the front support 11, the seat frame 2, the connecting rod 14, and the rear support 12. When the stroller is folded down, the push rod 132 slides relative to the front support 11, which unlocks the second locking mechanism. This makes unlocking the second locking mechanism convenient, requiring no separate operation, and facilitates the folding of the stroller. The specific structure of the second locking mechanism and the structure that drives the unlocking of the second locking mechanism can both adopt structures in the prior art.

[0133] As shown in Figure 5, the stroller frame also includes a rear crossbar 15 connecting the lower parts of the rear supports 12 on the left and right sides. The front wheel assembly 31 is located between the rear wheel assemblies 32 on the left and right sides and in front of the rear crossbar 15. Preferably, the front wheel assembly 31 is rotatably mounted on the front support 11 about a pivot extending in the vertical direction. In this way, when the stroller is folded, the front wheel assembly 31 can rotate relative to the front support 11, so that the plane of the front wheel assembly 31 is approximately parallel to the central axis of the rear crossbar 15. This allows the front wheel assembly 31 to be closer to the rear crossbar 15, and the front support 11 to be more closely aligned with the rear support 12, thereby reducing the structural volume of the stroller after folding.

[0134] When the stroller is in the unfolded state, as shown in Figures 1-5, all locking elements, the first locking mechanism, and the second locking mechanism on the push rod assembly 13 are locked. Most of the upper push rod 131 extends from the upper end of the lower push rod 132's cavity to the outside of the lower push rod 132's cavity. Most of the lower push rod 132 extends from the upper end of the front support rod 111's cavity to the outside of the front support rod 111's cavity. The lower part of the lower push rod 132 is located inside the front support rod 111's cavity and does not extend outside. The pull cord 42 is taut, keeping the fabric cover 41 flat. The upper push rod 131, lower push rod 132, and front support rod 111 are all arc-shaped, arching away from the seat frame 2, with a radius of curvature of 0.3–5 m. Preferably, the radius of curvature is 0.4–1 m. In this way, compared to the straight-bar upper push rod 131, lower push rod 132, and front support rod 111, the tilt of the pull rope 42 can be reduced, thereby improving the comfort of the seat assembly when riding. Furthermore, when the angle between the front support 11 and the rear support 12 is large, in this embodiment, the angle between the front support 11 and the rear support 12 is greater than 90 degrees. Compared to the straight-bar upper push rod 131, lower push rod 132, and front support rod 111, the backward tilt angle can be reduced, thus avoiding the problem of the stroller tipping over due to the center of gravity shifting backward. Additionally, the length of the push rod assembly 13 can be reduced to decrease the structural volume of the stroller, while also making the stroller more aesthetically pleasing. The center of the seat frame 2 is 0.25-0.55m above the ground, preferably 0.3-0.45m. The higher the center of the seat frame 2 is above the ground, the larger the radius of curvature of the corresponding upper push rod 131, lower push rod 132, and front support rod 111.

[0135] When the stroller is folded, the locks between the upper push rod 131 and the lower push rod 132 are fully unlocked, causing the upper push rod 131 to slide downwards until it is mostly retracted into the cavity of the lower push rod 132, simultaneously unlocking the first locking mechanism. The push rod assembly 13 slides downwards as a whole until the upper part of the telescopic rod is mostly retracted into the cavity of the front support rod 111, simultaneously unlocking the second locking mechanism. This causes the front wheel assembly 31 to rotate relative to the front support 11 around the pivot extending vertically, causing the rear support 12 to rotate forward and gradually approach the front support 11. The connecting rod 14 pulls the seat frame 2 downwards, gradually approaching the front support 11. During this process, the pull rope 42 gradually loosens. See Figures 23 and 24.

[0136] When the stroller is folded, the plane of the front wheel assembly 31 is approximately parallel to the central axis of the rear crossbar 15, causing the various rods that make up the stroller frame to be tightly close together. The lower part of the lower push rod 132 extends downwards to the outside of the cavity of the front support rod 111, allowing the lower part of the lower push rod 132, the front wheel assembly 31, and / or the rear wheel assembly 32 to stand upright on the ground. This allows the stroller to stand upright on the ground after folding, making it convenient to carry and store. In this embodiment, when the stroller is folded, the lowest point of the front wheel assembly 31 is located above the lowest point of the rear wheel assembly 32. The lower part of the lower push rod 132 and the rear wheel assemblies 32 on both sides stand upright on the ground. The rear wheel assemblies 32 on both sides and the lower part of the lower push rod 132 are sequentially connected to form a triangular structure, which makes the stroller more stable after folding and allows it to stand upright on the ground without easily tipping over. As shown in Figures 25 and 26.

[0137] When the stroller unfolds from its folded state, the push rod assembly 13 slides upward relative to the front support rod 111 until most of it extends out of the cavity of the front support rod 111, and the upper push rod 131 slides upward relative to the lower push rod 132 until most of it extends out of the cavity of the lower push rod 132. During this process, the pull cord 42 is gradually stretched. When the push rod assembly 13 is in the unfolded position, the pull cord 42 is in a pre-tensioned state. As the pull cord 42 is stretched to the pre-tensioned state, it can drive the seat frame 2 to rotate, thereby causing the rear support 12 and the front support 11 to rotate relative to each other. When the push rod assembly 13 is in the unfolded position, the front support 11 and the rear support 12 form a first angle, as shown in Figures 4 to 9. Then, when the push rod assembly 13 is pressed down, the rear support 12 and the front support 11 continue to rotate relative to each other and unfold, and the connecting rod 14 drives the seat frame 2 to gradually rotate upward away from the front support 11. During this process, the pull cord 42 moves relative to the push rod assembly 13, seat frame 2, and rear support 12 as the rear support 12 rotates. Its stroke continues to change, ensuring that the elasticity of the pull cord 42 does not affect the unfolding operation of the stroller. This allows the rear support 12 and front support 11 to continue rotating relative to each other until they reach the unfolded position, and the seat frame 2 to continue rotating upwards until it reaches the unfolded position. When the front support 11, rear support 12, and seat frame 2 have all reached the unfolded position, a second angle is formed between the front support 11 and rear support 12, which is greater than the first angle.

[0138] The front support 11 is provided with a limiting part 114. When the stroller is unfolded from the folded state and the rear support 12 is rotated away from the front support 11, the limiting part 114 limits the rotation of the rear support 12, thereby limiting the rear support 12 to the unfolded position of the stroller.

[0139] As shown in Figure 7, limiting parts 114 are respectively disposed on the left and right sides of the first connecting member 112, and protrude outward from the left or right side of the first connecting member 112 respectively. The limiting parts 114 are located on the rotation path of the rear support 112 in the direction away from the front support 11. When the trolley frame is in the unfolded state, the limiting parts 114 abut against the rear support 12, thereby blocking the rotation of the rear support 12, so that the rear support 12 cannot continue to rotate away from the front support 11, and the trolley frame is in the unfolded state.

[0140] The first shaft 16 and the limiting part 114 are located at opposite ends of the first connector 112, with the first shaft 16 closer to the upper end of the first connector 112 and the limiting part 114 closer to the lower end of the first connector 112. This arrangement results in a relatively large distance between the first shaft 16 and the limiting part 114, which can improve the connection strength between the front support 11 and the rear support 12 when the stroller is in the unfolded state.

[0141] Preferably, when the stroller is in the unfolded state, the first shaft 16 and the limiting part 114 are located on the upper and lower sides of the front support rod 111, respectively.

[0142] The limiting part 114 and the first connecting part 112 are integrally formed.

[0143] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A children's stroller, characterized in that: The stroller includes a stroller frame with an unfolded state and a folded state. The stroller frame includes a front support, a rear support, and a push rod assembly. The upper part of the front support is rotatably connected to the upper part of the rear support, and the push rod assembly is slidably connected to the front support. The stroller also includes a seat assembly disposed on the stroller frame. The seat assembly includes a seat frame, a pull cord, and a fabric cover. In the unfolded state, the pull cord is supported between the seat frame and the push rod assembly, and the fabric cover is disposed between the pull cord and the seat frame. The fabric cover and the seat frame form a forward-opening load-bearing space.

2. The stroller according to claim 1, characterized in that: During the unfolding process of the stroller from the folded state, the push rod assembly is in the unfolded position before the rear support; When the push rod assembly is fully extended, the pull rope is in a pre-tensioned state; when the rear bracket rotates relative to the front bracket to the extended position, the rear bracket drives the pull rope to a tensioned state.

3. The stroller according to claim 2, characterized in that: The first end of the pull rope is fixedly mounted on the base frame. The pull rope extends upward, passes over the upper part of the push rod assembly, and then extends downward to cooperate with the rear bracket, so that the pull rope moves and is tensioned when the rear bracket moves towards the unfolded state.

4. The stroller according to claim 3, characterized in that: The upper part of the rear bracket is provided with a bracket winding part that can slide relative to the pull rope. After the pull rope passes around the upper part of the push rod assembly, it extends downward and passes around the bracket winding part. The second end of the pull rope is fixedly mounted on the seat frame. Alternatively, the pull rope may be wrapped around the upper part of the push rod assembly and then extended downward so that the second end of the pull rope is fixedly disposed on the upper part of the rear bracket.

5. The stroller according to claim 4, characterized in that: The rear bracket is rotatably connected to the front bracket around the first axis, and a portion of the rear bracket extends upward to the front and above the first axis to form an extension portion, and the bracket winding portion is disposed on the extension portion.

6. The stroller according to claim 4, characterized in that: The first end of the pull rope is fixedly disposed at the front of the seat frame, and the rear of the seat frame is provided with a seat frame winding portion that can slide relative to the pull rope. The upper part of the push rod assembly is provided with a push rod winding portion that can slide relative to the pull rope. After the pull rope passes through the push rod winding portion, the seat frame winding portion and the bracket winding portion in sequence, the second end of the pull rope is fixedly disposed on the seat frame. Alternatively, after the pull rope passes through the push rod winding portion and the seat frame winding portion in sequence, the second end of the pull rope is fixedly disposed on the upper part of the rear bracket.

7. The stroller according to claim 6, characterized in that: The push rod is rotatably mounted on the push rod assembly, the seat is rotatably mounted on the seat, and the bracket is rotatably mounted on the rear bracket.

8. The stroller according to claim 6 or 7, characterized in that: One or more of the push rod winding part, the bracket winding part, and the seat winding part can slide relative to the component on which they are set, so as to adjust their position.

9. The stroller according to claim 8, characterized in that: The stroller also includes a driving member for sliding one or more of the push rod winding part, the bracket winding part, and the seat frame winding part. The driving member is rotatably or slidably mounted on the component on which the push rod winding part, the bracket winding part, or the seat frame winding part is mounted. The driving member cooperates with the push rod winding part, the bracket winding part, or the seat frame winding part.

10. The stroller according to claim 6, characterized in that: The seat frame is movably mounted on the front support. The seat assembly also has a linkage mechanism disposed between the seat frame and the rear support. The linkage mechanism is movably connected to the rear support and the seat frame respectively. When the rear support moves closer to the front support and folds down, the rear support drives the seat frame to move closer to the front support and fold down through the linkage mechanism. When the rear support rotates to the unfolded position, the rear support drives the seat frame to move to the unfolded position through the linkage mechanism.

11. The stroller according to claim 10, characterized in that: When the rear support rotates toward the unfolded position, the support winding portion and the seat winding portion move away from each other to tighten the pull rope.

12. The stroller according to claim 10, characterized in that: The seat frame is rotatably connected to the front support via a second shaft. In the unfolded state, the second shaft is located between the seat frame winding portion and the support winding portion.

13. The stroller according to claim 10, characterized in that: The linkage mechanism includes a connecting rod, one end of which is rotatably connected to the front of the seat frame; the other end of which is rotatably connected to the upper part of the rear support.

14. The stroller according to claim 3, characterized in that: The push rod assembly includes a push handle located at the top, the push handle includes a crossbar and side bars respectively disposed at both ends of the crossbar, the rear brackets are respectively disposed on the left and right sides, the pull ropes are respectively disposed on the left and right sides, the first end of the pull rope on each side is fixedly disposed on the corresponding side of the seat frame, and after sequentially moving around the side bar on the corresponding side and the upper part of the rear bracket on the corresponding side, the second end of the pull rope is fixedly disposed on the corresponding side of the seat frame; or, the first end of the pull rope on each side is fixedly disposed on the corresponding side of the seat frame, and after moving around the side bar on the corresponding side, the second end of the pull rope is fixedly disposed on the upper part of the rear bracket on the corresponding side.

15. The stroller according to claim 1, characterized in that: The stroller also includes a handlebar, which is detachably mounted on the fabric cover.

16. The stroller according to claim 15, characterized in that: The handrail is made of a rigid material, and the fabric cover is provided with a mounting part. The mounting part is provided with a plug groove, and the handrail has a plug part that mates with the plug groove.

17. The stroller according to claim 16, characterized in that: The fabric cover has a pair of side surfaces disposed on opposite sides of the bearing space, and each side surface is provided with the mounting portion.

18. The stroller according to claim 17, characterized in that: The side has a bottom edge disposed on the seat, and the length of the bottom edge of the side extending in the front-back direction is approximately equal to the length of the seat extending in the front-back direction; the push rod has a push handle, and the top of the side is disposed on the push handle; The mounting part is located near the bottom edge of the side, and the direction in which the mounting part extends intersects the bottom edge at an angle, with one end of the mounting part extending towards the rear end of the seat.

19. The stroller according to claim 18, characterized in that: The side also has an inclined edge extending from the front end of the push handle and the seat, and the other end of the mounting part extends to the inclined edge; the inclined edge is disposed on the pull cord, and the other end of the mounting part is disposed on the pull cord.

20. The stroller according to claim 1, characterized in that: The front support includes a front support rod and a first connector fixedly disposed on the upper part of the front support rod. The rear supports are respectively disposed on the left and right sides. The upper part of the rear support on each side is rotatably connected to the corresponding side of the first connector. The lower part of the push rod assembly is rotatably or slidably connected to the upper part of the front support rod.

21. The stroller according to claim 20, characterized in that: The push rod assembly includes an upper push rod and a lower push rod. The lower part of the upper push rod is slidably connected to the upper part of the lower push rod, and the lower part of the lower push rod is slidably connected to the upper part of the front support rod. The front support rod, the lower push rod, and the upper push rod are all arc-shaped.

22. The stroller according to claim 21, characterized in that: The front support rod, the lower push rod, and the upper push rod all arch in a direction away from the seat frame, and the radius of curvature of the arc is 0.3 to 5m.

23. The stroller according to claim 22, characterized in that: The radius of curvature of the arc is 0.4 to 1 m.

24. The stroller according to claim 21, characterized in that: When the stroller is in the unfolded state, the center of the seat frame is 0.25-0.55m above the ground.

25. The stroller according to claim 24, characterized in that: When the stroller is in the unfolded state, the center of the seat frame is 0.3-0.45m above the ground.

26. The stroller according to claim 21, characterized in that: The greater the height of the center of the frame from the ground, the greater the radius of curvature of the arc.

27. The stroller according to claim 1, characterized in that: When the push rod assembly slides relative to the front support to the unfolded position, the front support and the rear support rotate relative to each other to form a first angle; when the rear support is in the unfolded position, the front support and the rear support form a second angle, which is greater than the first angle.

28. The stroller according to claim 27, characterized in that: The second included angle is greater than 90 degrees.

29. The stroller according to claim 1 or 27, characterized in that: The front support is provided with a limiting part, which is located on the rotation path of the rear support. When the rear support rotates to abut against the limiting part, the rear support is in the unfolded position.

30. The stroller according to claim 29, characterized in that: The front support includes a front support rod and a first connector fixedly disposed on the upper part of the front support rod. The rear supports are respectively disposed on the left and right sides. The upper part of the rear support on each side is rotatably connected to the corresponding side of the first connector around a first axis. The limiting parts are respectively disposed on opposite sides of the first connector. The limiting parts on each side extend from the rear of the first connector to the left or to the right and outward from the first connector.

31. The stroller according to claim 1, characterized in that: The stroller also includes a front wheel assembly located at the bottom of the front support and a rear wheel assembly located at the bottom of the rear support. When the stroller is in a folded state, the front support and the rear support are close together, the push rod assembly slides down and folds into the front support, and the push rod assembly extends down to the lower part of the front support so that the push rod assembly, the front wheel assembly and / or the rear wheel assembly are supported on the ground.

32. The stroller according to claim 31, characterized in that: The front wheel assembly is rotatably mounted at the bottom of the front support about a pivot extending in the vertical direction. When the stroller is folded, the bottom of the rear wheel assembly is located below the bottom of the front wheel assembly, and the lower parts of the rear wheel assembly and the push rod assembly are supported on the ground together. The front support and the push rod assembly are both located in the middle of the stroller frame. The rear supports are located on the left and right sides of the stroller frame, and the rear wheel assemblies are located at the bottom of the rear supports on each side. When the stroller is folded, the lower parts of the rear wheel assemblies and the push rod assemblies on the left and right sides support each other on the ground. The lower parts of the rear wheel assemblies and the push rod assemblies on the left and right sides are connected sequentially to form a triangular structure.

33. The stroller according to claim 1, characterized in that: The push rod assembly includes a lower push rod and an upper push rod. The upper push rod is slidably disposed on the lower push rod along the length extension direction of the lower push rod. The lower push rod is slidably disposed on the front bracket along the length extension direction of the front bracket. The push rod assembly also includes a locking member for locking the relative positions of the upper push rod and the lower push rod.

34. The stroller according to claim 33, characterized in that: When the stroller is in a folded state, the locking device cooperates with the front support to lock the positions of the front support and the lower push rod; The front support has a protrusion, and the locking member has a recess that mates with the protrusion. When the stroller is folded, the protrusion engages with the recess. The locking member is rotatably mounted on the upper part of the lower push rod. The locking member can rotate relative to the lower push rod to engage the protrusion with the recess or disengage the protrusion from the recess.

35. The stroller according to claim 33, characterized in that: The stroller also includes a first locking mechanism for locking the relative positions of the front support and the lower push rod when the stroller frame is in the unfolded state, and for unlocking the first locking mechanism when the stroller is folded and the upper push rod slides relative to the lower push rod.

36. The stroller according to claim 33, characterized in that: The stroller also includes a second locking mechanism for locking the relative positions of the front support and the rear support when the stroller frame is in the unfolded state, and for unlocking the second locking mechanism when the stroller folds down and slides relative to the front support.

37. The stroller according to claim 1, characterized in that: The front support has a cavity extending along its length, and the push rod assembly is slidably disposed in the cavity along the length of the cavity, the bottom of the cavity being open; when the stroller is in the unfolded state, the lower part of the push rod assembly is located in the cavity and does not extend outside the cavity; when the stroller is in the folded state, the lower part of the push rod assembly extends from the bottom of the cavity to the outside of the cavity.

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