A baby stroller

Abstract

The present disclosure relates to a baby stroller, comprising: a handlebar; two front wheels, two rear wheels and a wheel frame assembly; two positioning rods arranged side by side to connect the wheel frame assembly and the handlebar; two seats, respectively arranged on the wheel frame assembly and the positioning rod; a first folding joint; and a second folding joint; wherein the handlebar is provided with a folding switch, which can trigger the first folding joint to unlock when pressed, so that when the handlebar is folded to a preset angle relative to the positioning rod, the second folding joint is further triggered to unlock, thereby completing the overall folding of the baby stroller after the wheel frame assembly itself is folded. According to an embodiment of the present disclosure, the baby stroller can accommodate at least two babies at the same time, and on the basis of ensuring that the baby stroller has a compact structure and strong maneuverability, it is more convenient to fold, so as to make it more convenient to carry the baby stroller and reduce the space occupied during storage of the baby stroller.

Description

Technical Field

[0001] The present disclosure relates to the field of baby carriages, and in particular to a baby carriage. Background Art

[0002] Currently, there are double-seat strollers on the market designed for twins, greatly facilitating parents' ability to carry and care for two children simultaneously while out and about. Existing double-seat strollers are primarily designed to be placed side-by-side. These strollers are relatively simple in structure, essentially two single-seat strollers joined horizontally. However, the doubled width of the stroller reduces maneuverability and increases the turning radius, making it more difficult to operate and potentially dangerous.

[0003] Compared to a horizontally arranged stroller, a vertically arranged stroller has the same width as a single-seat stroller, offering minimal change in maneuverability, a slightly increased turning radius, and overall greater maneuverability, making it a relatively safe two-seat stroller. However, a vertically arranged stroller requires two seats to be positioned between the front and rear wheels, resulting in a larger gap between the front and rear wheels and placing higher demands on structural strength and stability.

[0004] Existing longitudinally arranged strollers are divided into strollers with front and rear seats of uniform height and strollers with different front and rear seats. In the former, both seats can be mounted on the wheel frame assembly, while in the latter, both seats can be mounted separately on the wheel frame assembly and a positioning rod, or mounted on the positioning rod. Strollers with different seat heights can be designed to be more compact, making them easier to maneuver.

[0005] In summary, a stroller with longitudinal arrangement and different seat heights has higher overall maneuverability and safety due to the larger distance between the front and rear wheels and a more compact structure. However, it also makes the stroller more difficult to fold, inconvenient to carry, and occupies a larger space during storage. Summary of the Invention

[0006] In view of this, an embodiment of the present disclosure provides a baby stroller that can accommodate two babies at the same time. While ensuring the baby stroller's compact structure and strong maneuverability, it is more convenient to fold, making the baby stroller more convenient to carry and reducing the space occupied during storage.

[0007] In one aspect of the present disclosure, there is provided a baby stroller comprising:

[0008] Handlebar;

[0009] Two front wheels, two rear wheels, and wheel frame assemblies connected to the two front wheels and the two rear wheels respectively;

[0010] two positioning rods arranged side by side to connect the wheel frame assembly and the handlebar;

[0011] Two seats, respectively arranged on the wheel frame assembly and the positioning rod;

[0012] a first folding joint connected between the handlebar and the positioning rod, for locking the relative position between the handlebar and the positioning rod, or unlocking the handlebar and the positioning rod; and

[0013] a second folding joint, provided on the wheel carrier assembly, for locking the relative positions of the components of the wheel carrier assembly, or unlocking the wheel carrier assembly;

[0014] In which, the handlebar is provided with a folding switch, which can trigger the unlocking of the first folding joint when pressed, so that when the handlebar is folded to a preset angle relative to the positioning rod, the second folding joint is further triggered to unlock, thereby completing the overall folding of the stroller after the wheel frame assembly itself is folded.

[0015] In some embodiments, the first fold joint comprises:

[0016] A first housing, fixedly connected to the handlebar, and having a first internal tooth disposed therein;

[0017] A second housing, fixedly connected to the positioning rod, having a second inner tooth disposed therein, and disposed opposite to the first housing;

[0018] a first rotating shaft, for connecting the first shell and the second shell, and allowing the first shell and the second shell to rotate relative to each other; and

[0019] The first positioning gear is arranged between the first housing and the second housing, and is engaged with one of the second internal teeth and the first internal teeth at a first position in the axial direction of the first rotating shaft, and is engaged with both the first internal teeth and the second internal teeth at a second position in the axial direction of the first rotating shaft.

[0020] In some embodiments, the first fold joint further comprises:

[0021] a first elastic component, disposed between the first positioning gear and the second housing, capable of providing elastic force to enable the first positioning gear to engage with the first internal teeth and the second internal teeth simultaneously at the second position; and

[0022] a first shifting wheel, disposed between the first positioning gear and the first housing, capable of rotating to push the first positioning gear to move to the first position along the first rotating shaft;

[0023] The stroller further comprises:

[0024] The first steel rope is connected between the folding switch and the first toggle wheel, and can pull the first toggle wheel to rotate when the folding switch is pressed.

[0025] In some embodiments, a plurality of first grooves are provided on the side of the first toggle wheel close to the first shell, and the plurality of first grooves are distributed on the same circumference with the center of the first toggle wheel as the center, and the depth of each first groove gradually deepens along the same clockwise direction. A plurality of first protrusions opposite to the plurality of first grooves are provided on the side of the first shell opposite to the first toggle wheel. The plurality of first protrusions can slide respectively in the plurality of first grooves during the rotation of the first toggle wheel and abut against different depths of the plurality of first grooves to change the distance between the first toggle wheel and the second shell.

[0026] In some embodiments, the second fold joint comprises:

[0027] a third housing, fixedly connected to the positioning rod and provided with third internal teeth;

[0028] a fourth housing fixedly connected to the wheel carrier assembly, having a fourth internal tooth disposed therein and arranged opposite to the third housing;

[0029] a second rotating shaft, for connecting the third housing and the fourth housing, and enabling the third housing and the fourth housing to rotate relative to each other; and

[0030] The second positioning gear is arranged between the third housing and the fourth housing, and is engaged with one of the third internal teeth and the fourth internal teeth at a third position in the axial direction of the second rotating shaft, and is engaged with both the third internal teeth and the fourth internal teeth at a fourth position in the axial direction of the second rotating shaft.

[0031] In some embodiments, the second folding joint further comprises:

[0032] a second elastic component, disposed between the second positioning gear and the fourth housing, capable of providing elastic force to enable the second positioning gear to engage with the third inner teeth and the fourth inner teeth simultaneously at the fourth position; and

[0033] a second shifting wheel, disposed between the second positioning gear and the third housing, capable of rotating to push the second positioning gear to move along the second rotation axis to the fourth housing to the third position;

[0034] The stroller further comprises:

[0035] The second steel rope is connected between the first retractable joint and the second toggle wheel, and can pull the second toggle wheel to rotate when the first retractable joint rotates.

[0036] In some embodiments, a plurality of second grooves are provided on the side of the second positioning gear close to the second toggle wheel, and the plurality of second grooves are distributed on the same circumference with the center of the second positioning gear as the center, and the depth of each second groove gradually deepens along the same clockwise direction. A plurality of second protrusions opposite to the plurality of second grooves are provided on the side of the second toggle wheel opposite to the second positioning gear. The plurality of second protrusions can slide respectively in the plurality of second grooves during the rotation of the second toggle wheel and abut against the plurality of second grooves at different depths, so that the second toggle wheel changes the distance between the second positioning gear and the fourth shell.

[0037] In some embodiments, the first fold joint further comprises:

[0038] a folding linkage gear, fixedly connected to the first housing and capable of rotating around the first rotating shaft along with the first housing; and

[0039] A folding and pulling rack is provided on the second housing and can be engaged with the folding and pulling linkage gear and rotated along with the second housing;

[0040] Among them, a long slot hole is provided on the folding and traction rack in the same direction as the extension direction of the rack, and the first rotating shaft passes through the long slot hole so that the folding and traction rack can slide relative to the second shell, thereby pulling the second steel rope arranged at one end of the folding and traction rack away from the handle rod.

[0041] In some embodiments, the folding linkage gear is an incomplete gear, and when the handlebar and the positioning rod are not folded, the toothed area on the folding linkage gear is opposite to the folding traction rack, and when the handlebar and the positioning rod are fully folded, the toothed area on the folding linkage gear is opposite to the folding traction rack.

[0042] In some embodiments, the range of the toothless area on the folding linkage gear is configured such that when the handle bar and the positioning bar are folded from the unfolded state to a set angle, the toothed area of the folding linkage gear begins to contact the folding traction rack.

[0043] In some embodiments, the distance between the center line of the long slot hole in the length direction and the root of the folding traction rack is greater than the distance between the center and the top of the tooth of the folding linkage gear, and the distance between the center line of the long slot hole in the length direction and the top of the tooth of the folding traction rack is less than the distance between the center and the top of the tooth of the folding linkage gear.

[0044] In some embodiments, the tooth heights at both ends of the folding and traction rack are less than or equal to the tooth height at the middle section of the folding and traction rack.

[0045] In some embodiments, the wheel carrier assembly comprises:

[0046] a first front wheel frame, one end of which is connected to the two front wheels, and the other end of which is fixedly connected to the first side of the second folding joint;

[0047] a second front wheel frame, a first end of which is fixedly connected to the second side of the second folding joint; and

[0048] a rear wheel frame, a first end of which is connected to the rear wheel of the stroller, and a middle portion of which is rotatably connected to the middle portion of the second front wheel frame;

[0049] The first front wheel frame and the second front wheel frame are foldable with the second folding joint as a hinge point.

[0050] In some embodiments, the stroller further comprises:

[0051] The connecting rod assembly is foldably connected between the wheel frame assembly and the positioning rod, and is foldable during the overall folding process of the baby carriage.

[0052] In some embodiments, the connecting rod assembly includes:

[0053] a first connecting rod, a first end of which is fixedly connected to the second retracting joint and a second end of which is rotatably connected to the positioning rod;

[0054] a second connecting rod, a first end of which is rotatably connected to the positioning rod, and a second end of which is rotatably connected to the second end of the rear wheel frame; and

[0055] a third connecting rod, a first end of which is rotatably connected to the second end of the second connecting rod, and a second end of which is rotatably connected to the second retractable joint;

[0056] Wherein, the second end of the first connecting rod and the first end of the second connecting rod have a set distance on the positioning rod.

[0057] In some embodiments, the wheel carrier assembly further comprises:

[0058] A front crossbeam, with both ends fixedly connected to the middle portions of the two first front wheel frames;

[0059] A middle crossbeam, with two ends respectively fixedly connected to the two second retractable joints;

[0060] a rear cross beam, both ends of which are fixedly connected to the second ends of the two rear wheel frames; and

[0061] The rear wheel axle has two ends respectively connected to the wheel center positions of the two rear wheels.

[0062] In some embodiments, the length of the handlebar between the two positioning rods is retractable, and the front crossbeam, the middle crossbeam, the rear crossbeam and the rear wheel axle are retractable.

[0063] In some embodiments, the two seats include:

[0064] A first seat is detachably and position-adjustably mounted between the two first front wheel frames; and

[0065] The second seat is detachably and position-adjustably installed between the two positioning rods.

[0066] In some embodiments, the first seat and the second seat are foldable along a straight line where the distance between the two positioning rods lies.

[0067] Therefore, the baby stroller provided according to the embodiment of the present disclosure can accommodate at least two babies at the same time, and on the basis of ensuring the compact structure and strong maneuverability of the baby stroller, it is more convenient to fold, so as to make the baby stroller more convenient to carry and reduce the space occupied during the storage process of the baby stroller. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0069] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0070] Figure 1 is a schematic diagram of the overall structure according to some embodiments of the present disclosure;

[0071] Figure 2 is a schematic diagram of a frame structure with seats removed according to some embodiments of the present disclosure;

[0072] Figure 3 is a schematic diagram of a first folded state according to some embodiments of the present disclosure;

[0073] Figure 4 is a schematic diagram of a second folded state according to some embodiments of the present disclosure;

[0074] Figure 5 is a schematic diagram of a third folding state according to some embodiments of the present disclosure;

[0075] Figure 6 is a schematic diagram of a fourth folding state according to some embodiments of the present disclosure;

[0076] Figure 7is a schematic diagram of the positioning rod and handlebar structure according to some embodiments of the present disclosure;

[0077] Figure 8 is a schematic diagram of the setting position of the first steel rope according to some embodiments of the present disclosure;

[0078] Figure 9 is a schematic diagram of the exploded structure of the positioning rod, the handle rod, the first retractable joint and the second retractable joint according to some embodiments of the present disclosure;

[0079] Figure 10 is a schematic structural diagram of a locked state of a first folded joint according to some embodiments of the present disclosure;

[0080] Figure 11 is a schematic structural diagram of the unlocked state of the first folding joint according to some embodiments of the present disclosure;

[0081] Figure 12 is a schematic diagram of a first housing structure according to some embodiments of the present disclosure;

[0082] Figure 13 is a structural schematic diagram of the connection relationship between the first housing, the folding linkage gear, and the folding traction rack according to some embodiments of the present disclosure;

[0083] Figure 14 is a schematic cross-sectional structural diagram of a locked state of a first folded joint according to some embodiments of the present disclosure;

[0084] Figure 15 is a schematic cross-sectional structural diagram of the first folding joint in an unlocked state according to some embodiments of the present disclosure;

[0085] Figure 16 is a schematic structural diagram of a foldable traction rack according to some embodiments of the present disclosure;

[0086] Figure 17 is a schematic structural diagram of a folding linkage gear according to some embodiments of the present disclosure;

[0087] Figure 18 is a schematic structural diagram of a handlebar in a folded position relative to a positioning rod according to some embodiments of the present disclosure;

[0088] Figure 19 is a schematic diagram of the cooperation relationship between the folding traction rack and the folding linkage gear in a non-meshed state according to some embodiments of the present disclosure;

[0089] Figure 20 is a schematic diagram illustrating the meshing relationship between the folding traction rack and the folding linkage gear according to some embodiments of the present disclosure;

[0090] Figure 21is a schematic structural diagram of a handlebar in a fully folded position relative to a positioning rod according to some embodiments of the present disclosure;

[0091] Figure 22 is a schematic diagram of a connection structure of a second steel rope according to some embodiments of the present disclosure;

[0092] Figure 23 is a schematic structural diagram of a second folding joint according to some embodiments of the present disclosure;

[0093] Figure 24 is a schematic structural diagram of a second toggle wheel according to some embodiments of the present disclosure;

[0094] Figure 25 is a structural schematic diagram of a second positioning gear according to some embodiments of the present disclosure;

[0095] Figure 26 is a structural schematic diagram of a third housing according to some embodiments of the present disclosure;

[0096] Figure 27 is a schematic structural diagram of a fourth housing according to some embodiments of the present disclosure;

[0097] Figure 28 is a structural schematic diagram of a second positioning gear in a locked state according to some embodiments of the present disclosure;

[0098] Figure 29 is a structural schematic diagram of a second positioning gear in an unlocked state according to some embodiments of the present disclosure;

[0099] Figure 30 is a schematic cross-sectional structural diagram of a second positioning gear in a locked state according to some embodiments of the present disclosure;

[0100] Figure 31 is a schematic cross-sectional structural diagram of a second positioning gear in an unlocked state according to some embodiments of the present disclosure;

[0101] In the picture:

[0102] 1. Handle bar, 11. Retraction switch;

[0103] 21. Front wheel, 22. Rear wheel, 23. Wheel frame assembly, 231. First front wheel frame, 232. Second front wheel frame, 233. Rear wheel frame, 234. Front crossbeam, 235. Middle crossbeam, 236. Rear crossbeam, 237. Rear wheel axle;

[0104] 3. Positioning rod;

[0105] 4, seats, 41, first seat, 42, second seat;

[0106] 5. First folding joint, 51. First housing, 511. First inner tooth, 512. First protrusion, 52. Second housing, 521. Second inner tooth, 53. First rotating shaft, 54. First positioning gear, 55. First elastic component, 56. First toggle wheel, 561. First slot, 57. Folding linkage gear, 571. Toothless area, 572. Toothed area, 58. Folding traction rack, 581. Long slot;

[0107] 6. Second folding joint, 61. Third housing, 611. Third inner tooth, 62. Fourth housing, 621. Fourth inner tooth, 63. Second rotating shaft, 64. Second positioning gear, 641. Second slot, 65. Second elastic component, 66. Second toggle wheel, 661. Second protrusion;

[0108] 71, first steel rope, 72, second steel rope;

[0109] 8. Connecting rod assembly, 81. First connecting rod, 82. Second connecting rod, 83. Third connecting rod.

[0110] It should be understood that the size of each part shown in the drawings is not drawn according to the actual proportional relationship.In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0111] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure, its application, or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions, and numerical values set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0112] The terms "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The terms "include" or "comprises" and similar terms mean that the elements before the term include the elements listed after the term, and do not exclude the possibility of also including other elements. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0113] In the present disclosure, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be not directly connected to the other device but with an intervening device.

[0114] All terms (including technical or scientific terms) used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0115] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0116] like Figures 1 to 31 As shown:

[0117] In one aspect of the present disclosure, there is provided a baby stroller comprising:

[0118] Handlebar;

[0119] Two front wheels, two rear wheels, and wheel frame assemblies connected to the two front wheels and the two rear wheels respectively;

[0120] two positioning rods arranged side by side to connect the wheel frame assembly and the handlebar;

[0121] Two seats, respectively arranged on the wheel frame assembly and the positioning rod;

[0122] a first folding joint connected between the handlebar and the positioning rod, for locking the relative position between the handlebar and the positioning rod, or unlocking the handlebar and the positioning rod; and

[0123] a second folding joint, provided on the wheel carrier assembly, for locking the relative positions of the components of the wheel carrier assembly, or unlocking the wheel carrier assembly;

[0124] In which, the handlebar is provided with a folding switch, which can trigger the unlocking of the first folding joint when pressed, so that when the handlebar is folded to a preset angle relative to the positioning rod, the second folding joint is further triggered to unlock, thereby completing the overall folding of the stroller after the wheel frame assembly itself is folded.

[0125] The baby stroller provided by the present disclosure has two seats arranged in the vertical direction, one of which is arranged on the wheel frame assembly, and the other is arranged on the positioning rod, so that the wheel frame assembly and the positioning rod of the baby stroller are longer than those of an ordinary single-seat baby stroller. Therefore, it is necessary to make corresponding folding designs for the wheel frame assembly and the positioning rod.

[0126] Based on this, the first folding joint is used to fold the handlebar and the positioning rod, while the second folding joint is used to fold the wheel frame assembly, so that the folded length of the baby stroller can be reduced as much as possible in the length direction and the folded volume can be smaller.

[0127] Similarly, unlike single-seat strollers that can be folded with a single action, during the folding process of a double-seat stroller, the two folding joints are located far apart. Therefore, a single folding control action, such as pressing a folding button or pulling a folding cable, is difficult to act on the distant folding joints. In addition, folding two folding joints at the same time is prone to mutual interference between components, which invisibly increases the difficulty of the folding operation.

[0128] To address this issue, the present application introduces a coordinated folding mechanism between the first and second folding joints. Specifically, the second folding joint unlocks only when the first folding joint is unlocked and the handlebar is folded to a preset angle relative to the positioning rod. Therefore, the operator can only fold the stroller according to a predetermined sequence, preventing misoperation. Furthermore, the reliability of the locking and unlocking of the first and second folding joints is improved through independent control.

[0129] The folding process of the baby carriage is as follows: Figures 2 to 6 As shown, Figure 2 The stroller is shown in an unfolded state (with the seat removed); Figure 3 It shows that under the control of the folding switch, the handlebar rotates with the first folding joint as the rotation center until it overlaps with the positioning rod, at which time the second folding joint is unlocked; Figure 4~Figure 5 It shows two intermediate states of the wheel frame assembly being folded with the second folding joint as the rotation center; and Figure 6 The fully folded state of the baby carriage is shown, which takes up very little space and is easy to carry and store.

[0130] like Figures 7-9As shown, the distribution is a schematic diagram of the connection status of the handle rod, the positioning rod, the first retracting joint and the second retracting joint, the explosion structure and the structure of the first retracting joint. The figure shows the relationship between the retracting switch connected by the first steel rope and the first retracting joint: when the retracting switch is pressed, the first steel rope will be pulled toward the side of the handle rod, thereby driving the unlocking of the first retracting joint.

[0131] The unlocking of the first retraction joint is as follows Figures 10-14 As shown, in some embodiments, the first folding joint includes:

[0132] A first housing, fixedly connected to the handlebar, and having a first internal tooth disposed therein;

[0133] A second housing, fixedly connected to the positioning rod, having a second inner tooth disposed therein, and disposed opposite to the first housing;

[0134] a first rotating shaft, for connecting the first shell and the second shell, and allowing the first shell and the second shell to rotate relative to each other; and

[0135] The first positioning gear is arranged between the first housing and the second housing, and is engaged with one of the second internal teeth and the first internal teeth at a first position in the axial direction of the first rotating shaft, and is engaged with both the first internal teeth and the second internal teeth at a second position in the axial direction of the first rotating shaft.

[0136] The first retractable joint is controlled to be locked or unlocked by the engagement of the first positioning gear with the first shell and / or the second shell, that is, the first retractable joint is unlocked when engaged alone, and is locked when engaged simultaneously. The engagement between the first positioning gear and the first internal teeth and the second internal teeth can more evenly transmit the circumferential load between the positioning rod and the handlebar, avoiding the disadvantage of excessive stress concentration on the key during traditional keyway mating, and providing the first retractable joint with higher reliability and allowable stress range.

[0137] In addition, the unlocking direction of the first positioning gear is axially perpendicular to the force direction of the first positioning gear, which can ensure that even when the first positioning joint is subjected to a large circumferential load, the unlocking action can still be completed under relatively undisturbed conditions, thereby making the unlocking and locking of the first retracting joint more independent.

[0138] Furthermore, in order to achieve the axial movement of the first positioning gear, in some embodiments, the first retraction joint further includes:

[0139] a first elastic component, disposed between the first positioning gear and the second housing, capable of providing elastic force to enable the first positioning gear to engage with the first internal teeth and the second internal teeth simultaneously at the second position; and

[0140] a first shifting wheel, disposed between the first positioning gear and the first housing, capable of rotating to push the first positioning gear to move to the first position along the first rotating shaft;

[0141] The stroller further comprises:

[0142] The first steel rope is connected between the folding switch and the first toggle wheel, and can pull the first toggle wheel to rotate when the folding switch is pressed.

[0143] For those skilled in the art, the relative positions of the first elastic component and the first toggle wheel in the first retractable joint are varied, and it is only necessary to ensure that the first positioning gear is simultaneously engaged in the locked state and individually engaged in the unlocked state.

[0144] Furthermore, in order to enable the first toggle wheel to push the first positioning gear to move axially from the second position of simultaneous engagement to the first position of individual engagement during rotation, in some embodiments, a plurality of first grooves are provided on the side of the first toggle wheel close to the first shell, and the plurality of first grooves are distributed on the same circumference with the center of the first toggle wheel as the center, and the depth of each first groove gradually deepens in the same clockwise direction. A plurality of first protrusions opposite to the plurality of first grooves are provided on the side of the first shell opposite to the first toggle wheel. The plurality of first protrusions can slide in the plurality of first grooves respectively during the rotation of the first toggle wheel, and abut against different depths of the plurality of first grooves, so that the first toggle wheel changes the distance between it and the second shell.

[0145] It should be noted that the reference surface of the first groove is the side surface of the first driving wheel close to the first housing. With this surface as the reference, the depths of the multiple first grooves gradually increase along the same circumferential direction. The same circumferential direction in this case refers to the same clockwise direction or the same counterclockwise direction. The specific clockwise direction is determined by the pulling direction of the first steel rope and the facing direction of the first groove.

[0146] Further, such as Figures 21 and 22 As shown, when the handlebar is unlocked by the first retracting joint and completely overlaps the positioning rod, the second retracting joint is unlocked. At this time, the second steel rope is pulled between the first retracting joint and the second retracting joint to control the unlocking and locking of the second retracting joint.

[0147] Specifically, similar to the first fold joint, Figures 23 to 31 As shown, in some embodiments, the second folding joint includes:

[0148] a third housing, fixedly connected to the positioning rod and provided with third internal teeth;

[0149] a fourth housing fixedly connected to the wheel carrier assembly, having a fourth internal tooth disposed therein and arranged opposite to the third housing;

[0150] a second rotating shaft, for connecting the third housing and the fourth housing, and enabling the third housing and the fourth housing to rotate relative to each other; and

[0151] The second positioning gear is arranged between the third housing and the fourth housing, and is engaged with one of the third internal teeth and the fourth internal teeth at a third position in the axial direction of the second rotating shaft, and is engaged with both the third internal teeth and the fourth internal teeth at a fourth position in the axial direction of the second rotating shaft.

[0152] Similarly, in some embodiments, the second folding joint further comprises:

[0153] a second elastic component, disposed between the second positioning gear and the fourth housing, capable of providing elastic force to enable the second positioning gear to engage with the third inner teeth and the fourth inner teeth simultaneously at the fourth position; and

[0154] a second shifting wheel, disposed between the second positioning gear and the third housing, capable of rotating to push the second positioning gear to move along the second rotation axis to the fourth housing to the third position;

[0155] The stroller further comprises:

[0156] The second steel rope is connected between the first retractable joint and the second toggle wheel, and can pull the second toggle wheel to rotate when the first retractable joint rotates.

[0157] Similarly, in some embodiments, a plurality of second grooves are provided on the side of the second positioning gear close to the second toggle wheel, and the plurality of second grooves are distributed on the same circumference with the center of the second positioning gear as the center, and the depth of each second groove gradually deepens in the same clockwise direction. A plurality of second protrusions opposite to the plurality of second grooves are provided on the side of the second toggle wheel opposite to the second positioning gear. The plurality of second protrusions can slide respectively in the plurality of second grooves during the rotation of the second toggle wheel, and abut against the plurality of second grooves at different depths, so that the second toggle wheel changes the distance between the second positioning gear and the fourth shell.

[0158] It should be noted that in the first retractable joint, the first groove and the first protrusion are located on opposite sides of the first housing and the first toggle wheel, while in the second retractable joint, the second groove and the second protrusion are located on opposite sides of the second positioning gear and the second retracting gear. Therefore, those skilled in the art should understand that in either the first or second retractable joint, the cooperating groove and protrusion only need to be located on opposite axial sides of two different parts, not limited to the housing, the positioning gear, or the toggle wheel. Therefore, the choice of locating them in two or other components can be determined based on the production and design difficulty of the component.

[0159] like Figures 15-20 As shown, in order to achieve the linkage retraction control of the second retraction joint by the first retraction joint, in some embodiments, the first retraction joint further includes:

[0160] a folding linkage gear, fixedly connected to the first housing and capable of rotating around the first rotating shaft along with the first housing; and

[0161] A folding and pulling rack is provided on the second housing and can be engaged with the folding and pulling linkage gear and rotated along with the second housing;

[0162] Among them, a long slot hole is provided on the folding and traction rack in the same direction as the extension direction of the rack, and the first rotating shaft passes through the long slot hole so that the folding and traction rack can slide relative to the second shell, thereby pulling the second steel rope arranged at one end of the folding and traction rack away from the handle rod.

[0163] The arrangement of the folding linkage gear and the folding traction rack cleverly converts the rotational motion between the positioning rod and the handlebar into linear motion of the second steel cable, thereby achieving a change in the motion mode during the folding operation with relatively small components. Furthermore, the folding linkage gear and the folding traction rack can transmit motion in any direction. That is, when the handlebar is rotated from the folded position to the open position, the second steel cable will move in the opposite direction, causing the second folding joint to relock.

[0164] Furthermore, in order to achieve precise control of the displacement of the second steel rope and prevent the second folding joint from being unlocked by rotating the handlebar by a smaller angle due to misoperation, in some embodiments, the folding linkage gear is an incomplete gear, and when the handlebar and the positioning rod are not folded, the toothed area on the folding linkage gear is opposite to the folding traction rack, and when the handlebar and the positioning rod are fully folded, the toothed area on the folding linkage gear is opposite to the folding traction rack.

[0165] And, in some embodiments, the range of the toothless area on the folding linkage gear is configured so that when the handle bar and the positioning bar are folded from the unfolded state to a set angle, the toothed area of the folding linkage gear begins to contact the folding traction rack.

[0166] It can be imagined that the size of the toothed area on the folding linkage gear is positively correlated with the displacement length of the second steel rope, so the displacement length of the second steel rope can be controlled by adjusting the toothed area on the folding linkage gear.

[0167] Since the folding switch is provided on the handlebar, the operator may easily touch the folding switch by mistake while pushing the stroller. In this case, even if the first folding joint is unlocked, the handlebar can rotate relative to the first folding joint. However, under the premise that the folding linkage gear adopts an incomplete gear structure, the second folding joint will not be unlocked as long as the rotation angle of the handlebar does not exceed a specific angle range, thereby ensuring the structural stability of the wheel frame assembly and further ensuring the relative stability of the overall structure of the stroller. At this time, the operator has enough time to react, correct the misoperation, and return the handlebar to its original position, thus avoiding possible damage to the baby in the stroller due to the instantaneous unlocking of the entire stroller structure in case of misoperation.

[0168] Furthermore, in order to ensure effective engagement between the folding traction rack and the folding linkage gear, in some embodiments, the distance between the midline of the long slot hole in the length direction and the tooth root of the folding traction rack is greater than the distance between the center and the tooth top of the folding linkage gear, and the distance between the midline of the long slot hole in the length direction and the tooth top of the folding traction rack is less than the distance between the center and the tooth top of the folding linkage gear.

[0169] The first distance requirement is used to ensure that the teeth of the folding linkage gear can be accommodated between the teeth of the folding traction rack, and the second distance requirement is used to ensure that the teeth of the folding linkage gear and the teeth of the folding traction rack can abut against each other in the meshing state to transfer the load.

[0170] Furthermore, in order to ensure smoothness of the initial engagement between the folding traction rack and the folding linkage gear, in some embodiments, the tooth heights at both ends of the folding traction rack are less than or equal to the tooth height of the middle section of the folding traction rack.

[0171] In order to realize the foldable function of the wheel frame assembly, Figure 2 As shown, in some embodiments, the wheel carrier assembly includes:

[0172] a first front wheel frame, one end of which is connected to the two front wheels, and the other end of which is fixedly connected to the first side of the second folding joint;

[0173] a second front wheel frame, a first end of which is fixedly connected to the second side of the second folding joint; and

[0174] a rear wheel frame, a first end of which is connected to the rear wheel of the stroller, and a middle portion of which is rotatably connected to the middle portion of the second front wheel frame;

[0175] The first front wheel frame and the second front wheel frame are foldable with the second folding joint as a hinge point.

[0176] The arrangement of the first front wheel frame and the second front wheel frame not only meets the front wheel frame length requirements and the connection requirements with the rear wheel frame required by the double-seater baby carriage, but also makes the wheel frame assembly smaller in size after folding through the second folding joint, thereby achieving a good design effect.

[0177] Furthermore, in order to achieve effective support of the wheel frame assembly in the open state and effective traction of the wheel frame assembly in the folded state, in some embodiments, the baby stroller further includes:

[0178] The connecting rod assembly is foldably connected between the wheel frame assembly and the positioning rod, and is foldable during the overall folding process of the baby carriage.

[0179] Specifically, if Figure 2 As shown, in some embodiments, the connecting rod assembly includes:

[0180] a first connecting rod, a first end of which is fixedly connected to the second retracting joint and a second end of which is rotatably connected to the positioning rod;

[0181] a second connecting rod, a first end of which is rotatably connected to the positioning rod, and a second end of which is rotatably connected to the second end of the rear wheel frame; and

[0182] a third connecting rod, a first end of which is rotatably connected to the second end of the second connecting rod, and a second end of which is rotatably connected to the second retractable joint;

[0183] Wherein, the second end of the first connecting rod and the first end of the second connecting rod have a set distance on the positioning rod.

[0184] It should be noted that if Figures 3 and 4As shown, when the stroller is in the open position, the second link and the rear wheel frame are collinear, forming a stable self-locking structure. This means that the second link can effectively transfer the load from the rear wheel frame to the handlebar. The first end of the third link is disposed at the junction of the second link and the rear wheel frame. Therefore, the third link pulls the second link, easily breaking the self-locking structure and allowing the second link and the rear wheel frame to fold relative to each other.

[0185] Further, such as Figure 2 As shown, in some embodiments, the wheel carrier assembly further includes:

[0186] A front crossbeam, with both ends fixedly connected to the middle portions of the two first front wheel frames;

[0187] A middle crossbeam, with two ends respectively fixedly connected to the two second retractable joints;

[0188] a rear cross beam, both ends of which are fixedly connected to the second ends of the two rear wheel frames; and

[0189] The rear wheel axle has two ends respectively connected to the wheel center positions of the two rear wheels.

[0190] In order to achieve a more complete folding of the baby stroller, in some embodiments, the length of the handlebar between the two positioning rods is retractable, and the front crossbeam, the middle crossbeam, the rear crossbeam and the rear wheel axle are retractable.

[0191] In some embodiments, the two seats include:

[0192] A first seat is detachably and position-adjustably mounted between the two first front wheel frames; and

[0193] The second seat is detachably and position-adjustably installed between the two positioning rods.

[0194] In order to further achieve a more complete folding of the baby stroller, in some embodiments, the first seat and the second seat are foldable along a straight line where the distance between the two positioning rods lies.

[0195] Therefore, the baby stroller provided according to the embodiment of the present disclosure can accommodate at least two babies at the same time, and on the basis of ensuring the compact structure and strong maneuverability of the baby stroller, it is more convenient to fold, so as to make the baby stroller more convenient to carry and reduce the space occupied during the storage process of the baby stroller.

[0196] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0197] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A baby stroller, characterized in that: include: Handlebar; Two front wheels, two rear wheels, and wheel frame assemblies connected to the two front wheels and the two rear wheels respectively; two positioning rods arranged side by side to connect the wheel frame assembly and the handlebar; Two seats, respectively arranged on the wheel frame assembly and the positioning rod; a first folding joint connected between the handlebar and the positioning rod, for locking the relative position between the handlebar and the positioning rod, or unlocking the handlebar and the positioning rod; as well as a second folding joint, provided on the wheel carrier assembly, for locking the relative positions of the components of the wheel carrier assembly, or unlocking the wheel carrier assembly; a first steel rope connecting the retractable switch and the first retractable joint; a second steel rope, pulled between the first retractable joint and the second retractable joint, for controlling the unlocking and locking of the second retractable joint; The handlebar is provided with a folding switch, which can trigger the unlocking of the first folding joint when pressed, so that when the handlebar is folded to a preset angle relative to the positioning rod, the second folding joint is further triggered to unlock, thereby completing the overall folding of the baby stroller after the wheel frame assembly itself is folded; When the folding switch is pressed, the first steel rope will be pulled toward the side of the handle bar, thereby driving the unlocking of the first folding joint. When the handle bar is unlocked by the first folding joint and rotates around the first folding joint as the rotation center until it overlaps with the positioning rod, the second folding joint is unlocked. The first folding joint includes a first shell fixedly connected to the handlebar, a second shell fixedly connected to the positioning rod and arranged opposite to the first shell, a first rotating shaft connecting the first shell and the second shell so that the first shell and the second shell can rotate with each other, a folding linkage gear fixedly connected to the first shell and capable of rotating with the first shell around the first rotating shaft, and a folding traction rack arranged on the second shell and capable of rotating with the second shell in meshing with the folding linkage gear; The folding and traction rack is provided with a long slot hole consistent with the extension direction of the rack, and the first rotating shaft passes through the long slot hole to enable the folding and traction rack to slide relative to the second shell, thereby pulling the second steel rope arranged at one end of the folding and traction rack away from the handle rod.

2. The baby stroller according to claim 1, wherein: The first shell is provided with first internal teeth, and the second shell is provided with second internal teeth; Wherein, the first retraction joint further includes: The first positioning gear is arranged between the first housing and the second housing, and is engaged with one of the second internal teeth and the first internal teeth at a first position in the axial direction of the first rotating shaft, and is engaged with both the first internal teeth and the second internal teeth at a second position in the axial direction of the first rotating shaft.

3. The baby stroller according to claim 2, wherein: The first folding joint further includes: a first elastic component, disposed between the first positioning gear and the second housing, capable of providing elastic force to enable the first positioning gear to engage with the first internal teeth and the second internal teeth simultaneously at the second position; and a first shifting wheel, disposed between the first positioning gear and the first housing, capable of rotating to push the first positioning gear to move to the first position along the first rotating shaft; The first steel rope is connected between the folding switch and the first toggle wheel, and can pull the first toggle wheel to rotate when the folding switch is pressed.

4. The baby stroller according to claim 3, wherein: A plurality of first grooves are provided on a side surface of the first toggle wheel close to the first shell. The plurality of first grooves are distributed on the same circumference with the center of the first toggle wheel as the center, and the depth of each first groove gradually deepens along the same clockwise direction. A plurality of first protrusions opposite to the plurality of first grooves are provided on a side of the first shell opposite to the first toggle wheel. The plurality of first protrusions can slide respectively in the plurality of first grooves during the rotation of the first toggle wheel and abut against the plurality of first grooves at different depths, so that the first toggle wheel changes the distance between it and the second shell.

5. The baby stroller according to claim 2, wherein: The second folding joint comprises: a third housing, fixedly connected to the positioning rod and provided with third internal teeth; a fourth housing fixedly connected to the wheel carrier assembly, having a fourth internal tooth disposed therein and arranged opposite to the third housing; a second rotating shaft, for connecting the third housing and the fourth housing, and enabling the third housing and the fourth housing to rotate relative to each other; and The second positioning gear is arranged between the third housing and the fourth housing, and is engaged with one of the third internal teeth and the fourth internal teeth at a third position in the axial direction of the second rotating shaft, and is engaged with both the third internal teeth and the fourth internal teeth at a fourth position in the axial direction of the second rotating shaft.

6. The baby stroller according to claim 5, characterized in that: The second folding joint further includes: a second elastic component, disposed between the second positioning gear and the fourth housing, capable of providing elastic force to enable the second positioning gear to engage with the third inner teeth and the fourth inner teeth simultaneously at the fourth position; and a second shifting wheel, disposed between the second positioning gear and the third housing, capable of rotating to push the second positioning gear to move along the second rotation axis to the fourth housing to the third position; The second steel rope is connected between the first folding joint and the second toggle wheel, and can pull the second toggle wheel to rotate when the first folding joint rotates.

7. The baby stroller according to claim 6, wherein: A plurality of second grooves are provided on the side of the second positioning gear close to the second toggle wheel. The plurality of second grooves are distributed on the same circumference with the center of the second positioning gear as the center, and the depth of each second groove gradually deepens along the same clockwise direction. A plurality of second protrusions opposite to the plurality of second grooves are provided on the side of the second toggle wheel opposite to the second positioning gear. The plurality of second protrusions can slide respectively in the plurality of second grooves during the rotation of the second toggle wheel and abut against the plurality of second grooves at different depths, so that the second toggle wheel changes the distance between the second positioning gear and the fourth shell.

8. The baby stroller according to claim 1, wherein: The folding linkage gear is an incomplete gear, and when the handle bar and the positioning bar are not folded, the toothed area on the folding linkage gear is opposite to the folding traction rack, and when the handle bar and the positioning bar are fully folded, the toothed area on the folding linkage gear is opposite to the folding traction rack.

9. The baby stroller according to claim 8, characterized in that: The range of the toothless area on the folding linkage gear is configured such that when the handle bar and the positioning bar are folded from the unfolded state to a set angle, the toothed area of the folding linkage gear begins to contact the folding traction rack.

10. The baby stroller according to claim 1, wherein: The distance between the center line of the long slot hole in the length direction and the tooth root of the folding traction rack is greater than the distance between the center and the tooth top of the folding linkage gear, and the distance between the center line of the long slot hole in the length direction and the tooth top of the folding traction rack is less than the distance between the center and the tooth top of the folding linkage gear.

11. The baby stroller according to claim 10, wherein: The tooth heights at both ends of the folding and traction rack are less than or equal to the tooth height of the middle section of the folding and traction rack.

12. The baby stroller according to claim 1, wherein: The wheel carrier assembly comprises: a first front wheel frame, one end of which is connected to the two front wheels, and the other end of which is fixedly connected to the first side of the second folding joint; a second front wheel frame, a first end of which is fixedly connected to the second side of the second folding joint; and a rear wheel frame, a first end of which is connected to the rear wheel of the stroller, and a middle portion of which is rotatably connected to the middle portion of the second front wheel frame; The first front wheel frame and the second front wheel frame are foldable with the second folding joint as a hinge point.

13. The baby stroller according to claim 12, wherein: The stroller further comprises: The connecting rod assembly is foldably connected between the wheel frame assembly and the positioning rod, and is foldable during the overall folding process of the baby carriage.

14. The baby stroller according to claim 13, wherein: The connecting rod assembly comprises: a first connecting rod, a first end of which is fixedly connected to the second retracting joint and a second end of which is rotatably connected to the positioning rod; a second connecting rod, a first end of which is rotatably connected to the positioning rod, and a second end of which is rotatably connected to the second end of the rear wheel frame; and a third connecting rod, a first end of which is rotatably connected to the second end of the second connecting rod, and a second end of which is rotatably connected to the second retractable joint; Wherein, the second end of the first connecting rod and the first end of the second connecting rod have a set distance on the positioning rod.

15. The baby stroller according to claim 12, wherein: The wheel carrier assembly further comprises: A front crossbeam, with both ends fixedly connected to the middle portions of the two first front wheel frames; A middle crossbeam, with two ends respectively fixedly connected to the two second retractable joints; a rear cross beam, both ends of which are fixedly connected to the second ends of the two rear wheel frames; and The rear wheel axle has two ends respectively connected to the wheel center positions of the two rear wheels.

16. The baby stroller according to claim 15, wherein: The length of the handlebar between the two positioning rods is retractable, and the front crossbeam, the middle crossbeam, the rear crossbeam and the rear wheel axle are retractable.

17. The baby stroller according to claim 12, wherein: The two seats include: A first seat is detachably and position-adjustably mounted between the two first front wheel frames; and The second seat is detachably and position-adjustably installed between the two positioning rods.

18. The baby stroller according to claim 17, wherein: The first seat and the second seat are foldable along a direction of a straight line where a distance between the two positioning rods is located.

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