Baby stroller frame folding joint, baby stroller frame and baby stroller

Abstract

The present invention relates to a folding joint of a baby stroller frame, a baby stroller frame, and a baby stroller. The folding joint (400) of the baby stroller frame includes: a handle joint (403); a rear foot joint (407) disposed inside the handle joint and having a locked state fixedly relative to the handle joint and an unlocked state rotatable relative to the handle joint; a first unlocking device for switching the rear foot joint to the unlocked state rotatable relative to the handle joint; a front foot joint (411) disposed inside the rear foot joint and having a locked state fixedly relative to the rear foot joint and an unlocked state rotatable relative to the rear foot joint; and a second unlocking device disposed on the handle joint for driving the front foot joint to switch to the unlocked state rotatable relative to the rear foot joint when the handle joint rotates a first preset angle relative to the rear foot joint. The baby stroller frame includes the folding joint. The baby stroller includes the baby stroller frame. The frame of the present invention has better safety when folded.

Description

Technical Field

[0001] The present invention relates to the technical field of baby strollers, and in particular to a folding joint of a baby stroller frame, a baby stroller frame and a baby stroller. Background Art

[0002] At present, baby strollers are widely used. Most parenting families use baby strollers to carry babies. Especially when the journey is a bit far, using a baby stroller to transport a baby can save a lot of effort.

[0003] Existing baby strollers are usually foldable. However, when folding, once the unlocking button is operated, all joints enter the unlocked state. At this time, most parts of the baby stroller frame are in a movable state. If the operation is a bit careless, it may cause accidental injuries such as pinching to the baby in the stroller and the operator, affecting the safety of using the stroller. Summary of the Invention

[0004] The purpose of the present invention is to provide a folding joint of a baby stroller frame, a baby stroller frame and a baby stroller, and to improve the safety and convenience of the operation when folding the baby stroller frame as much as possible.

[0005] Based on the first aspect of the present invention, a folding joint of a baby stroller frame is provided, including:

[0006] A handle joint;

[0007] A rear foot joint, arranged inside the handle joint, and having a locked state relatively fixed to the handle joint and an unlocked state rotatable relative to the handle joint;

[0008] A first unlocking device for switching the rear foot joint to an unlocked state rotatable relative to the handle joint;

[0009] A front foot joint, arranged inside the rear foot joint, and having a locked state relatively fixed to the rear foot joint and an unlocked state rotatable relative to the rear foot joint; and

[0010] A second unlocking device, arranged on the handle joint, for driving the front foot joint to switch to an unlocked state rotatable relative to the rear foot joint when the handle joint rotates a first preset angle relative to the rear foot joint.

[0011] Optionally, the folding joint of the baby stroller frame further includes a first locking device arranged between the handle joint and the rear foot joint. The first locking device is used to relatively fix the handle joint and the rear foot joint, and the first unlocking device is used to drive the first locking device to move so as to switch the rear foot joint to an unlocked state rotatable relative to the handle joint.

[0012] Optionally, the folding joint of the stroller frame further includes a second locking device disposed between the rear foot joint and the front foot joint. The second locking device is used to relatively fix the rear foot joint and the front foot joint, and the second unlocking device is used to drive the second locking device to move so that the front foot joint switches to an unlocked state where it can rotate relative to the rear foot joint.

[0013] Optionally, the second unlocking device includes a first boss. The first boss is disposed on the side of the handle joint close to the rear foot joint, and the top surface of the first boss is inclined relative to this side. The rear foot joint is provided with a first through hole. The first boss passes through the first through hole, and the first boss is used to push the second locking device to move when the handle joint rotates a first preset angle relative to the rear foot joint.

[0014] Optionally, the second locking device includes a first gear, a first toothed ring disposed inside the front foot joint, and a second toothed ring disposed inside the rear foot joint. In the locked state where the front foot joint and the rear foot joint are relatively fixed, the first gear meshes with both the first toothed ring and the second toothed ring simultaneously; in the unlocked state where the front foot joint can rotate relative to the rear foot joint, the first gear disengages from the position where it meshes with the first toothed ring or the first gear disengages from the position where it meshes with the second toothed ring.

[0015] Optionally, the second unlocking device includes a first boss. The first boss is disposed on the side of the handle joint close to the rear foot joint, and the top surface of the first boss is inclined relative to this side. The rear foot joint is provided with a first through hole. The first boss passes through the first through hole, and the first boss is used to push the first gear to disengage from the position where it meshes with the second toothed ring when the handle joint rotates a first preset angle relative to the rear foot joint.

[0016] Optionally, the second locking device further includes a push plate. The push plate is disposed between the first gear and the rear foot joint, and the first boss pushes the first gear by pushing the push plate.

[0017] Optionally, the folding joint of the stroller frame further includes:

[0018] A first connecting joint, disposed inside the front foot joint, for connecting the seat, and having a locked state where it is relatively fixed to the front foot joint and an unlocked state where it can rotate relative to the front foot joint; and

[0019] A third unlocking device, disposed on the rear foot joint, for driving the first connecting joint to switch to an unlocked state where it can rotate relative to the front foot joint when the rear foot joint rotates a second preset angle relative to the front foot joint.

[0020] Optionally, the folding joint of the stroller frame further includes a third locking device disposed between the front foot joint and the first connecting joint. The third locking device is used to relatively fix the front foot joint and the first connecting joint, and the third unlocking device is used to drive the third locking device to move so that the first connecting joint switches to an unlocked state where it can rotate relative to the front foot joint.

[0021] Optionally, the third unlocking device includes a second boss, which is arranged on the side of the rear foot joint close to the front foot joint. The front foot joint is provided with a second through hole, and the second boss passes through the second through hole. The second boss is used to push the third locking device to move when the rear foot joint rotates relative to the front foot joint by a second preset angle.

[0022] Optionally, the third locking device includes:

[0023] A first groove, which is arranged on the first connecting joint; and

[0024] A first bolt, which is movably connected to the front foot joint. In the locked state where the front foot joint and the first connecting joint are relatively fixed, the first bolt is inserted into the first groove; in the unlocked state where the front foot joint is rotatable relative to the first connecting joint, the first bolt disengages from the first groove.

[0025] Optionally, the third unlocking device includes a second boss, which is arranged on the side of the rear foot joint close to the front foot joint. The front foot joint is provided with a second through hole, and the second boss passes through the second through hole. The second boss is used to push the first bolt away from the first groove when the rear foot joint rotates relative to the front foot joint by a second preset angle.

[0026] Optionally, the end of the first bolt is provided with a first inclined surface that is inclined with respect to the moving direction of the first bolt.

[0027] Optionally, the folding joint of the stroller frame further includes a first connecting joint, which is arranged inside the front foot joint and is used to connect the seat. The first connecting joint has a locked state where it is relatively fixed to the front foot joint and an unlocked state where it is rotatable relative to the front foot joint. A first stop block is arranged on the first connecting joint, and a second stop block is arranged on the handle joint. The second stop block passes through the rear foot joint and the front foot joint and extends to the circumferential side of the first stop block. The second stop block is used to push the first stop block to rotate the first connecting joint to a preset position when the stroller frame is unfolded.

[0028] Based on the second aspect of the present invention, a stroller frame is provided, which includes the folding joint of the stroller frame described above.

[0029] Based on the third aspect of the present invention, a stroller frame is provided, which includes a second connecting joint and the folding joint of the stroller frame described above. The second connecting joint is connected to the first connecting joint, and the second connecting joint is used to install the seat.

[0030] Optionally, the first connecting joint includes a socket, and the second connecting joint includes a plug. The plug is inserted into the socket to realize the connection between the first connecting joint and the second connecting joint.

[0031] Optionally, the socket is symmetric about its vertical axis front and back, and the plug is symmetric about its vertical axis front and back.

[0032] Optionally, the stroller frame further includes a fourth locking device and a fourth unlocking device. The fourth locking device is disposed between the plug and the socket and is used to relatively fix the plug and the socket, and the fourth unlocking device is used to drive the fourth locking device to move so that the plug and the socket can move relative to each other.

[0033] Optionally, the fourth locking device includes a first slider and a pin disposed on the plug. The first slider is provided with a long hole inclined with respect to the relative movement direction of the plug and the socket. The pin is inserted into the long hole and moves within the long hole. A locking port is provided in the socket. When the pin is inserted into the locking port, the plug and the socket are relatively fixed. The fourth unlocking device is used to drive the first slider to move, thereby driving the pin to disengage from the locking port.

[0034] Optionally, the stroller frame further includes a backrest joint, a fifth locking device and a fifth unlocking device. The backrest joint is disposed inside the second connecting joint. The fifth locking device is disposed between the backrest joint and the second connecting joint. The fifth locking device is used to relatively fix the backrest joint and the second connecting joint, and the fifth unlocking device is used to drive the fifth locking device to move so that the backrest joint and the second connecting joint can move relative to each other.

[0035] Optionally, the fifth locking device includes a second gear, a third gear ring disposed on the backrest joint, and a fourth gear ring disposed on the second connecting joint. In the locked state where the backrest joint and the second connecting joint are relatively fixed, the second gear meshes with the third gear ring and the fourth gear ring simultaneously; in the unlocked state where the backrest joint is rotatable relative to the second connecting joint, the second gear moves away from the position where it meshes with the third gear ring or the second gear moves away from the position where it meshes with the fourth gear ring.

[0036] Optionally, the fifth unlocking device includes a second flexible member, a second slider and a third slider. The second flexible member is connected to the second slider. The second slider is provided with a first tooth, and the third slider is provided with a second tooth. The first tooth has a second inclined surface inclined with respect to the movement direction of the first tooth, and the second tooth has a third inclined surface inclined with respect to the movement direction of the second tooth. The first tooth and the second tooth mesh with each other, and the second inclined surface contacts the third inclined surface. The third slider is disposed inside the backrest joint and contacts the second gear. When the second flexible member is pulled, it drives the second slider to move. The second slider drives the third slider to move axially along the backrest joint through the first tooth, thereby pushing the second gear away from the position where it meshes with the third gear ring.

[0037] Optionally, the stroller frame further includes a footrest joint. The footrest joint is disposed inside the backrest joint. The footrest joint is provided with a third stop block, and the backrest joint is provided with a fourth stop block. The third stop block and the fourth stop block contact each other and are used to make the footrest joint move together with the backrest joint when the backrest joint moves backward.

[0038] Optionally, the stroller frame further includes an armrest joint disposed inside the footrest joint. The armrest joint is provided with a fifth stop block, the footrest joint is provided with a third through hole, and the backrest joint is provided with a second groove. The fifth stop block passes through the third through hole and is inserted into the second groove. When the backrest joint folds relative to the footrest joint, the fifth stop block drives the armrest joint to fold towards the footrest joint.

[0039] Based on the fourth aspect of the present invention, a stroller is provided, including the above stroller frame.

[0040] Based on the above technical solution, in the embodiment of the folding joint of the stroller frame of the present invention, by operating the first unlocking device, the rear foot joint can be switched to an unlocked state where it is rotatable relative to the handle joint. When the handle joint rotates a first preset angle relative to the rear foot joint, the second unlocking device is triggered. The second unlocking device can drive the front foot joint to switch to an unlocking device that is rotatable relative to the rear foot joint, enabling the front foot joint to fold relative to the rear foot joint, thereby realizing the folding of the handle joint, the rear foot joint, and the front foot joint. During the folding process, the second unlocking device is not triggered after the first unlocking device is unlocked, and the second unlocking device is only triggered after the handle joint rotates a first preset angle relative to the rear foot joint. Therefore, the joints in the folding joint do not all enter the unlocked state simultaneously, effectively avoiding accidental injuries such as pinching to the baby in the stroller or the operator, and improving the safety of operation; the second unlocking device can be automatically triggered after the handle joint rotates a first preset angle without further operating the unlocking button, thus effectively improving the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0042] Figure 1 It is a schematic structural diagram of an embodiment of the stroller frame of the present invention.

[0043] Figure 2 It is a schematic structural diagram of another embodiment of the stroller frame of the present invention.

[0044] Figure 3 It is a schematic structural diagram of the folded state of an embodiment of the stroller frame of the present invention.

[0045] Figure 4 It is a schematic structural diagram of the folded state of another embodiment of the stroller frame of the present invention.

[0046] Figure 5 It is a schematic partial structural diagram of an embodiment of the stroller frame of the present invention.

[0047] Figure 6 Exploded view of an embodiment of the folding joint of the stroller frame of the present invention.

[0048] Figure 7 Schematic structural diagram of the handle joint and the first locking device in an embodiment of the folding joint of the stroller frame of the present invention.

[0049] Figure 8 Schematic structural diagram of the rear foot joint in an embodiment of the folding joint of the stroller frame of the present invention.

[0050] Figure 9 Schematic structural diagram of the handle joint in an embodiment of the folding joint of the stroller frame of the present invention.

[0051] Figure 10 Schematic structural diagram of the first gear, the push plate and the second elastic member in an embodiment of the folding joint of the stroller frame of the present invention.

[0052] Figure 11 Schematic structural diagram of the first connecting joint in an embodiment of the folding joint of the stroller frame of the present invention.

[0053] Figure 12 Schematic structural diagram of the first pin in an embodiment of the folding joint of the stroller frame of the present invention.

[0054] Figure 13 Schematic structural diagram of the mating structure between the second boss and the first pin in an embodiment of the folding joint of the stroller frame of the present invention.

[0055] Figure 14 Schematic structural diagram of the mating structure between the handle joint and the first connecting joint in an embodiment of the folding joint of the stroller frame of the present invention.

[0056] Figure 15 Schematic structural diagram of the seat mounting bracket in an embodiment of the stroller frame of the present invention.

[0057] Figure 16 Schematic diagram of the first folded state of the seat mounting bracket in an embodiment of the stroller frame of the present invention.

[0058] Figure 17 Schematic diagram of the second folded state of the seat mounting bracket in an embodiment of the stroller frame of the present invention.

[0059] Figure 18 Schematic structural diagram of the seat mounting bracket after being completely folded in an embodiment of the stroller frame of the present invention.

[0060] Figure 19 Exploded view of the folding joint in an embodiment of the stroller frame of the present invention.

[0061] Figure 20 Schematic diagram of the assembly structure of the backrest joint, footrest joint and armrest joint in an embodiment of the stroller frame of the present invention.

[0062] Figure 21 Schematic diagram of the structure of the second connecting joint in an embodiment of the stroller frame of the present invention.

[0063] Figure 22 Schematic diagram of the cooperation structure among the backrest joint, footrest joint and armrest joint in an embodiment of the stroller frame of the present invention.

[0064] In the figure:

[0065] 100, handle bar; 200, rear foot bar; 300, front foot bar; 400, folding joint; 500, backrest bar; 600, footrest bar; 700, folding joint; 800, armrest bar; 900, canopy bar;

[0066] 101, folding button; 501, folding button;

[0067] 401, protective cover; 402, first rivet; 403, handle joint; 404, second pin; 405, first flexible member; 406, first elastic member; 407, rear foot joint; 408, push plate; 409, first gear; 410, second elastic member; 411, front foot joint; 412, third elastic member; 413, first pin; 414, first connecting joint; 415, first stop block; 416, second boss; 417, second stop block; 418, first boss; 419, third groove; 420, first groove; 421, second boss; 422, fourth through hole; 423, first inclined surface;

[0068] 701, quick release button; 702, second rivet; 703, second connecting joint; 704, first slider; 705, retaining pin; 706, fourth elastic member; 707, fifth elastic member; 708, second gear; 709, backrest joint; 710, canopy joint; 711, third slider; 712, second slider; 713, second flexible member; 714, sixth elastic member; 715, footrest joint; 716, fifth stop block; 717, armrest joint; 718, third stop block; 719, fourth stop block; 720, second groove; 721, third through hole. Detailed implementation manners

[0069] Next, the technical solutions in the embodiments will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0070] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0071] Reference Figures 1 - 6 As shown, in a schematic embodiment of the folding joint of the stroller frame provided by the present invention, the folding joint 400 includes a handle joint 403, a rear foot joint 407, a first unlocking device, a front foot joint 411, and a second unlocking device. The rear foot joint 407 is arranged inside the handle joint 403, and the rear foot joint 407 has a locked state of being relatively fixed to the handle joint 403 and an unlocked state of being rotatable relative to the handle joint 403. The first unlocking device is used to switch the rear foot joint 407 to the unlocked state of being rotatable relative to the handle joint 403. The front foot joint 411 is arranged inside the rear foot joint 407, and the front foot joint 411 has a locked state of being relatively fixed to the rear foot joint 407 and an unlocked state of being rotatable relative to the rear foot joint 407. The second unlocking device is arranged on the handle joint 403. The second unlocking device is used to drive the front foot joint 411 to switch to the unlocked state of being rotatable relative to the rear foot joint 407 when the handle joint 403 rotates a first preset angle relative to the rear foot joint 407.

[0072] In the above schematic embodiment, the inner side refers to the side close to the center of the stroller frame.

[0073] In the above-described exemplary embodiment, by operating the first unlocking device, the rear foot joint 407 can be switched to an unlocked state where it is rotatable relative to the handle joint 403. When the handle joint 403 rotates a first preset angle relative to the rear foot joint 407, the second unlocking device is triggered. The second unlocking device can drive the front foot joint 411 to switch to an unlocked state where it is rotatable relative to the rear foot joint 407, enabling the front foot joint 411 to fold relative to the rear foot joint 407, thereby achieving the folding of the handle joint 403, the rear foot joint 407, and the front foot joint 411. During the folding process, the second unlocking device is not triggered after the first unlocking device is unlocked, and the second unlocking device is only triggered after the handle joint 403 rotates a first preset angle relative to the rear foot joint 407. Therefore, not all joints in the folding joints will enter the unlocked state simultaneously, effectively avoiding accidental injuries such as pinching to the baby in the stroller or the operator, and improving the safety of the operation; after the handle joint rotates a first preset angle, the second unlocking device can be automatically triggered without further operating the unlocking button, thus effectively improving the convenience of the operation.

[0074] In the above-described exemplary embodiment, the first preset angle can be the angle when the handle joint 403 and the rear foot joint 407 are completely folded and the handle joint 403 contacts the rear foot joint 407.

[0075] Further, the folding joint 400 further includes a first connecting joint 414 and a third unlocking device. The first connecting joint 414 is disposed inside the front foot joint 411. The first connecting joint 414 is used to connect the seat, and the first connecting joint 414 has a locked state where it is relatively fixed to the front foot joint 411 and an unlocked state where it is rotatable relative to the front foot joint 411. The third unlocking device is disposed on the rear foot joint 407. The third unlocking device is used to drive the first connecting joint 414 to switch to an unlocked state where it is rotatable relative to the front foot joint 411 when the rear foot joint 407 rotates a second preset angle relative to the front foot joint 411.

[0076] The second preset angle can be the angle when the rear foot joint 407 and the front foot joint 411 are completely folded and the rear foot joint 407 contacts the front foot joint 411.

[0077] By providing the third unlocking device, after the handle joint 403, the rear foot joint 407, and the front foot joint 411 are folded, when the rear foot joint 407 rotates a second preset angle relative to the front foot joint 411, the third unlocking device can drive the first connecting joint 414 to switch to an unlocked state where it is rotatable relative to the front foot joint 411, enabling the first connecting joint 414 to rotate relative to the front foot joint 411 to achieve the folding of components such as the seat connected to the first connecting joint 414 relative to the front foot joint 411, the rear foot joint 407, and the handle joint 403.

[0078] It can be seen that the unlocking of the third unlocking device is also triggered when the folding reaches a certain degree, which further ensures that not all joints in the folding joint enter the unlocking state simultaneously, effectively improving the safety of operation.

[0079] In an alternative embodiment of the stroller frame, the stroller frame further includes a folding joint 700. The folding joint 700 includes a second connecting joint 703. The second connecting joint 703 is connected to the first connecting joint 414. The second connecting joint 703 is used for mounting a seat, and the seat is used for carrying a baby.

[0080] The present invention also provides a stroller frame, which includes the above-mentioned folding joint; the present invention also provides a stroller, which includes the above-mentioned stroller frame.

[0081] The technical effects of the folding joint of the stroller frame are equally applicable to the stroller frame and the stroller, and will not be elaborated here.

[0082] Next, a specific structure of an embodiment of the folding joint of the stroller frame, the stroller frame and the stroller of the present invention will be described in detail:

[0083] As Figures 1 - 5 shown, the stroller frame includes a handlebar 100, a rear footrest 200, a front footrest 300, a folding joint 400, a backrest rod 500, a footrest rod 600, a folding joint 700, an armrest rod 800 and a canopy rod 900.

[0084] The handlebar 100, the rear footrest 200 and the front footrest 300 are connected by the folding joint 400. The backrest rod 500, the footrest rod 600 and the armrest rod 800 are connected by the folding joint 700. The canopy rod 900 is installed on the backrest rod 500. The folding joint 400 is connected to the folding joint 700.

[0085] The handlebar 100, the rear footrest 200, the front footrest 300, the backrest rod 500, the footrest rod 600, the armrest rod 800 and the canopy rod 900 can be solid or hollow.

[0086] The handlebar 100, the backrest rod 500, the footrest rod 600, the armrest rod 800 and the canopy rod 900 are all in a U-shaped configuration. There are two rear footrests 200 and two front footrests 300, which are respectively arranged on the left and right sides of the frame. The number of the folding joints 400 and the folding joints 700 is also two, which are respectively arranged on the left and right sides of the frame.

[0087] As Figure 6 and Figure 19As shown, the folding joint 400 includes a first connecting joint 414, and the folding joint 700 includes a second connecting joint 703. The first connecting joint 414 is connected to the second connecting joint 703 to achieve the connection between the folding joint 400 and the folding joint 700.

[0088] As Figure 6 shown, the folding joint 400 includes a handle joint 403, a rear foot joint 407, a front foot joint 411, and a first connecting joint 414. The handle rod 100 is installed on the handle joint 403, the rear foot rod 200 is installed on the rear foot joint 407, the front foot rod 300 is installed on the front foot joint 411, and the folding joint 700 is connected to the first connecting joint 414.

[0089] A first locking device is provided between the handle joint 403 and the rear foot joint 407. The first locking device is used to relatively fix the handle joint 403 and the rear foot joint 407, and the first unlocking device is used to drive the first locking device to move so that the rear foot joint 407 switches to an unlocked state where it can rotate relative to the handle joint 403.

[0090] The first locking device includes a second bolt 404 and a third groove 419. As Figure 8 shown, the third groove 419 is provided on the rear foot joint 407. The second bolt 404 is movably connected to the handle joint 403. In the locked state where the rear foot joint 407 and the handle joint 403 are relatively fixed, the second bolt 404 is inserted into the third groove 419; in the unlocked state where the rear foot joint 407 can rotate relative to the handle joint 403, the second bolt 404 disengages from the third groove 419.

[0091] As Figure 7 shown, the first locking device further includes a first elastic member 406. The first elastic member 406 is provided inside the handle joint 403 and abuts against the second bolt 404. The first elastic member 406 is used to keep the second bolt 404 in the state of being inserted into the third groove 419 and reset the second bolt 404 after the second bolt 404 disengages from the third groove 419.

[0092] The first unlocking device includes a first flexible member 405. The first flexible member 405 is connected to the second bolt 404. When the first flexible member 405 is pulled, it drives the second bolt 404 to move relative to the third groove 419. Under the action of the first flexible member 405, when the second bolt 404 disengages from the third groove 419, the locking between the handle joint 403 and the rear foot joint 407 is released, and the handle joint 403 can rotate relative to the rear foot joint 407.

[0093] The first flexible member 405 passes through the handle rod 100. A closing button 101 is provided on the upper part of the handle rod 100. By pressing the closing button 101, the user can pull the first flexible member 405, so that the second bolt 404 disengages from the third groove 419, and the locking between the handle joint 403 and the rear foot joint 407 is released.

[0094] A second locking device is provided between the rear foot joint 407 and the front foot joint 411. The second locking device is used to relatively fix the rear foot joint 407 and the front foot joint 411. The second unlocking device is used to drive the second locking device to move when the handle joint 403 rotates a first preset angle relative to the rear foot joint 407, so that the front foot joint 411 switches to an unlocked state where it can rotate relative to the rear foot joint 407.

[0095] As Figure 7 and Figure 9 shown, the second unlocking device includes a first boss 418. The first boss 418 is provided on the side of the handle joint 403 close to the rear foot joint 407, and the top surface of the first boss 418 is inclined relative to this side. The rear foot joint 407 is provided with a first through hole. The first boss 418 passes through the first through hole. The first boss 418 is used to push the second locking device to move when the handle joint 403 rotates a first preset angle relative to the rear foot joint 407.

[0096] The first boss 418 is provided on the side of the handle joint 403 close to the rear foot joint 407. The first boss 418 extends axially in the direction close to the rear foot joint 407 along the circumferential direction from this side, and the top surface of the first boss 418 is inclined relative to this side. The number of the first bosses 418 is two, which are respectively arranged on both sides of the second bolt 404. The first boss 418 is arc-shaped.

[0097] The second locking device includes a first gear 409, a first toothed ring arranged in the front foot joint 411, and a second toothed ring arranged in the rear foot joint 407. In the locked state where the front foot joint 411 and the rear foot joint 407 are relatively fixed, the first gear 409 meshes with the first toothed ring and the second toothed ring at the same time; in the unlocked state where the front foot joint 411 can rotate relative to the rear foot joint 407, the first gear 409 leaves the position where it meshes with the first toothed ring or the first gear 409 leaves the position where it meshes with the second toothed ring. The first boss 418 is used to push the first gear 409 to leave the position where it meshes with the second toothed ring when the handle joint 403 rotates a first preset angle relative to the rear foot joint 407.

[0098] As Figure 10 shown, the second locking device further includes a push plate 408. The push plate 408 is arranged between the first gear 409 and the rear foot joint 407. The first boss 418 pushes the first gear 409 by pushing the push plate 408.

[0099] The push plate 408 includes a plate portion and a tooth portion, and the tooth portion is connected to the plate portion. By providing the tooth portion, the maximum thickness of the push plate 408 can be increased, and at the same time, it is beneficial to reduce the total weight of the push plate 408. By providing the tooth portion, it is convenient to contact the first boss 418 and push the first gear 409 under the action of the first boss 418.

[0100] The second locking device further includes a second elastic member 410. The second elastic member 410 is used to keep the first gear 409 in a position where it meshes with the first gear ring and the second gear ring simultaneously, and to reset it when the first gear 409 leaves the position where it meshes with the first gear ring or the second gear ring.

[0101] A third locking device is provided between the front foot joint 411 and the first connecting joint 414. The third locking device is used to relatively fix the front foot joint 411 and the first connecting joint 414, and the third unlocking device is used to drive the third locking device to move so that the first connecting joint 414 switches to an unlocked state where it can rotate relative to the front foot joint 411.

[0102] The third unlocking device includes a second boss 416. The second boss 416 is provided on the side of the rear foot joint 407 close to the front foot joint 411. The front foot joint 411 is provided with a second through hole, and the second boss 416 passes through the second through hole. The second boss 416 is used to push the third locking device to move when the rear foot joint 407 rotates relative to the front foot joint 411 by a second preset angle.

[0103] The second boss 416 is cylindrical, and the second boss 416 is provided at a position close to the outer edge of the rear foot joint 407. The second boss 416 extends axially in a direction close to the front foot joint 411 from the side of the rear foot joint 407 close to the front foot joint 411.

[0104] As Figure 11 shown, the third locking device includes a first groove 420 and a first pin 413. The first groove 420 is provided on the first connecting joint 414. The first pin 413 is movably connected to the front foot joint 411. In the locked state where the front foot joint 411 and the first connecting joint 414 are relatively fixed, the first pin 413 is inserted into the first groove 420; in the unlocked state where the front foot joint 411 can rotate relative to the first connecting joint 414, the first pin 413 disengages from the first groove 420. The second boss 416 is used to push the first pin 413 out of the first groove 420 when the rear foot joint 407 rotates relative to the front foot joint 411 by a second preset angle.

[0105] As Figure 12As shown, the first bolt 413 is provided with a second boss 421 and a fourth through hole 422. The second boss 421 is inserted into the first groove 420. The first bolt 413 is installed on the front foot joint 411 through the fourth through hole 422. The fourth through hole 422 is an oblong hole, and the first bolt 413 can move relative to the front foot joint 411.

[0106] The length of the second through hole is greater than the width of the second boss 416. When the rear foot joint 407 rotates relative to the front foot joint 411, the second boss 416 moves within the second through hole. When the rear foot joint 407 rotates relative to the front foot joint 411 by a second preset angle, the second boss 416 contacts the end of the first bolt 413 and pushes the first bolt 413 out of the first groove 420.

[0107] The third locking device further includes a third elastic member 412. The third elastic member 412 abuts against the first bolt 413, is used to keep the first bolt 413 in the position of being inserted into the first groove 420, and reset it after the first bolt 413 disengages from the first groove 420.

[0108] As Figure 13 shown, in order to avoid direct collision, the end of the first bolt 413 is provided with a first inclined surface 423 that is inclined with respect to the movement direction of the first bolt 413. By providing the first inclined surface 423, when the second boss 416 moves with the rear foot joint 407 to the position where it contacts the end of the first bolt 413, the first bolt 413 can be slowly pushed along the first inclined surface 423, avoiding direct collision between the second boss 416 and the first bolt 413 and causing damage to the second boss 416 or the first bolt 413.

[0109] As Figure 14 shown, the first connecting joint 414 is arranged inside the front foot joint 411, and the first connecting joint 414 has a locked state of being relatively fixed to the front foot joint 411 and an unlocked state of being rotatable relative to the front foot joint 411. The first connecting joint 414 is provided with a first stop block 415, and the handle joint 403 is provided with a second stop block 417. The second stop block 417 passes through the rear foot joint 407 and the front foot joint 411 and extends to the circumferential side of the first stop block 415. The second stop block 417 is used to rotate the first connecting joint 414 to a preset position by pushing the first stop block 415 when the baby stroller frame is unfolded.

[0110] By providing the first stop block 415 and the second stop block 417, it can be ensured that the first connecting joint 414 can be unfolded to a preset position when the baby stroller frame is unfolded.

[0111] The folding joint 400 further includes a protective cover 401 and a first rivet 402. The protective cover 401 is disposed on the outermost side and is used to protect the components within the folding joint 400. The first rivet 402 passes through the handle joint 403, the second pin 404, the rear foot joint 407, the push plate 408, the first gear 409, the second elastic member 410, the front foot joint 411, the first pin 413, and the first connecting joint 414.

[0112] Up to this point, when folding, the folding button 101 can be pressed first, the first flexible member 405 is pulled, driving the second pin 404 to disengage from the third groove 419, unlocking the rear foot joint 407 and the handle joint 403; the handle joint 403 is pressed downward so that the handle joint 403 folds backward against the rear foot joint 407; when the handle joint 403 and the rear foot joint 407 are fully folded and in contact, the first boss 418 pushes the push plate 408, and the push plate 408 pushes the first gear 409 away from the position meshing with the second toothed ring, releasing the lock between the rear foot joint 407 and the front foot joint 411; the rear foot joint 407 and the front foot joint 411 are folded relative to each other, and when the rear foot joint 407 and the front foot joint 411 are fully folded and in contact, the second boss 416 drives the first pin 413 to disengage from the first groove 420, releasing the lock between the front foot joint 411 and the first connecting joint 414, and the component connected to the first connecting joint 414 can be folded relative to the front foot joint 411.

[0113] To facilitate the connection and disconnection of the first connecting joint 414 and the second connecting joint 703, the first connecting joint 414 includes a socket, and the second connecting joint 703 includes a plug. The plug is inserted into the socket to achieve the connection between the first connecting joint 414 and the second connecting joint 703.

[0114] By providing the socket and the plug, the first connecting joint 414 and the second connecting joint 703 can be quickly connected and are also easy to quickly disassemble.

[0115] The stroller frame further includes a fourth locking device and a fourth unlocking device. The fourth locking device is disposed between the plug and the socket and is used to relatively fix the plug and the socket, and the fourth unlocking device is used to drive the fourth locking device to move so that the plug and the socket can move relative to each other.

[0116] As Figure 19 shown, the fourth locking device includes a first slider 704 and a retaining pin 705 provided on the plug. The first slider 704 is provided with a long hole inclined with respect to the relative movement direction of the plug and the socket. The retaining pin 705 is inserted into the long hole and moves within the long hole. A locking notch is provided in the socket. When the retaining pin 705 is inserted into the locking notch, the plug and the socket are relatively fixed. The fourth unlocking device is used to drive the first slider 704 to move, thereby driving the retaining pin 705 to disengage from the locking notch.

[0117] The fourth locking device further includes a fourth elastic member 706, which is used to keep the first slider 704 in the position where the pin 705 is inserted into the locking notch, and to reset the first slider 704 after the pin disengages from the locking notch.

[0118] The fourth unlocking device includes a quick-release button 701. By pressing the quick-release button 701, the first slider 704 can be driven to move upward, thereby driving the pin 705 to retract through the long hole. The pin 705 disengages from the locking notch. At this time, the plug can be pulled out, and the first connecting joint 414 and the second connecting joint 703 are disconnected, realizing the disassembly of the seat. After releasing the quick-release button 701, under the action of the fourth elastic member 706, the first slider 704 resets, driving the pin 705 to extend and engage into the locking notch, thereby connecting the first connecting joint 414 and the second connecting joint 703, realizing the installation and fixation of the seat.

[0119] The socket is symmetric about its vertical axis in the front-back direction, and the plug is symmetric about its vertical axis in the front-back direction. The front-back direction here refers to the direction from the front foot bar 300 to the rear foot bar 200. The advantage of this setting is that it is convenient for the cross-matching between the sockets and plugs on the left and right sides of the vehicle frame, and the seat can be installed bidirectionally.

[0120] As Figure 1 shown, the seat mounting frame composed of the backrest bar 500, the footrest bar 600, the folding joint 700, the armrest bar 800, and the ceiling bar 900 is positively mounted on the vehicle body composed of the handle bar 100, the rear foot bar 200, the front foot bar 300, and the folding joint 400;

[0121] As Figure 2 shown, the seat mounting frame is reversely mounted on the vehicle body;

[0122] As Figure 3 shown, the seat mounting frame is positively mounted on the vehicle body and is fully folded;

[0123] As Figure 4 shown, the seat mounting frame is reversely mounted on the vehicle body and is fully folded.

[0124] Furthermore, the seat mounting frame can also be fully folded.

[0125] As Figure 15 shown, it is a schematic structural diagram of the seat mounting frame in the unfolded state. As Figure 16 shown, the seat mounting frame is in the first folding state; as Figure 17 shown, the seat mounting frame is in the second folding state; as Figure 18 shown, the seat mounting frame is in the fully folded state.

[0126] As Figure 19As shown, the stroller frame further includes a backrest joint 709, a fifth locking device, and a fifth unlocking device. The backrest joint 709 is disposed inside the second connecting joint 703. The fifth locking device is disposed between the backrest joint 709 and the second connecting joint 703. The fifth locking device is used to relatively fix the backrest joint 709 and the second connecting joint 703. The fifth unlocking device is used to drive the fifth locking device to move so that the backrest joint 709 and the second connecting joint 703 can relatively move.

[0127] The fifth locking device includes a second gear 708, a third gear ring disposed on the backrest joint 709, and a fourth gear ring disposed on the second connecting joint 703. In the locked state where the backrest joint 709 and the second connecting joint 703 are relatively fixed, the second gear 708 meshes with both the third gear ring and the fourth gear ring simultaneously; in the unlocked state where the backrest joint 709 is rotatable relative to the second connecting joint 703, the second gear 708 leaves the position where it meshes with the third gear ring or the second gear 708 leaves the position where it meshes with the fourth gear ring.

[0128] The fifth locking device further includes a fifth elastic member 707. The fifth elastic member 707 is disposed outside the second gear 708 and is used to keep the second gear 708 in the position where it meshes with the third gear ring and the fourth gear ring, and to reset the second gear 708 when the second gear 708 leaves the position where it meshes with the third gear ring or the position where it meshes with the fourth gear ring.

[0129] The fifth unlocking device includes a second flexible member 713, a second slider 712, and a third slider 711. The second flexible member 713 is connected to the second slider 712. The second slider 712 is provided with a first tooth, and the third slider 711 is provided with a second tooth. The first tooth has a second inclined surface inclined with respect to the movement direction of the first tooth, and the second tooth has a third inclined surface inclined with respect to the movement direction of the second tooth. The first tooth and the second tooth mesh with each other, and the second inclined surface contacts the third inclined surface. The third slider 711 is disposed inside the backrest joint 709 and contacts the second gear 708. When the second flexible member 713 is pulled, it drives the second slider 712 to move. The second slider 712 drives the third slider 711 to move axially along the backrest joint 709 through the first tooth, thereby pushing the second gear 708 away from the position where it meshes with the third gear ring.

[0130] The fifth unlocking device further includes a sixth elastic member 714. The sixth elastic member 714 abuts against the second slider 712 and is used to reset the second slider 712 after it moves.

[0131] The second flexible member 713 penetrates into the backrest rod 500. A folding button 501 is provided at the top of the backrest rod 500. By pressing the folding button 501, the second flexible member 713 can be pulled, and then the second slider 712 can be pulled to release the lock between the backrest joint 709 and the second connecting joint 703.

[0132] As Figure 20 shown, the stroller frame further includes a footrest joint 715. The footrest joint 715 is disposed inside the backrest joint 709. The footrest joint 715 is provided with a third stopper 718, and the backrest joint 709 is provided with a fourth stopper 719. The third stopper 718 and the fourth stopper 719 are in contact with each other and are used to cause the footrest joint 715 to move together with the backrest joint 709 when the backrest joint 709 moves backward.

[0133] The third stopper 718 is disposed on the outer edge of the footrest joint 715, and the fourth stopper 719 is disposed on the outer edge of the backrest joint 709. When the third stopper 718 and the fourth stopper 719 are in contact with each other, the footrest joint 715 cannot continue to rotate backward relative to the backrest joint 709. Therefore, it can rotate backward together with the backrest joint 709, and during the rotation process, the footrest joint 715 and the backrest joint 709 can always maintain an included angle of 180 degrees.

[0134] As Figure 21 and Figure 22 shown, the stroller frame further includes an armrest joint 717. The armrest joint 717 is disposed inside the footrest joint 715. The armrest joint 717 is provided with a fifth stopper 716, the footrest joint 715 is provided with a third through hole 721, and the backrest joint 709 is provided with a second groove 720. The fifth stopper 716 passes through the third through hole 721 and is inserted into the second groove 720. When the backrest joint 709 folds relative to the footrest joint 715, the fifth stopper 716 drives the armrest joint 717 to fold toward the footrest joint 715. By providing the fifth stopper 716, the armrest joint 717 can be caused to fold toward the footrest joint 715 together with the backrest joint 709, thereby realizing the complete folding of the backrest joint 709, the armrest joint 717, and the footrest joint 715.

[0135] So far, when the seat mounting frame is folded, the folding button 501 can be pressed first, and the second flexible member 713 can be pulled to drive the second slider 712 to move upward. When the second slider 712 moves upward, through the cooperation of the second inclined surface and the third inclined surface, the third slider 711 will be driven to move axially in the direction close to the second connecting joint 703, thereby driving the second gear 708 to leave the position meshed with the third gear ring, and the locking between the backrest joint 709 and the second connecting joint 703 is released; the backrest joint 709 is pushed to fold toward the footrest joint 715; during the folding process of the backrest joint 709, the fifth stopper 716 can drive the armrest joint 717 to fold toward the footrest joint 715 together; the canopy joint 710 is rotatably mounted on the backrest rod 500, and during the folding process of the seat mounting frame, the canopy joint 710 can also be folded, thereby realizing the complete folding of the seat mounting frame.

[0136] Through the description of multiple embodiments of the folding joint of the stroller frame, the stroller frame, and the stroller of the present invention, it can be seen that the folding joint of the stroller frame, the stroller frame, and the stroller embodiments of the present invention adopt a progressive unlocking method, effectively improving the safety of the stroller during folding operation. At the same time, the seat can be installed in two directions, forward and reverse, and both forward installation and reverse installation can achieve folding, ensuring the convenience of using the stroller.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features. Without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A folding joint (400) of a baby stroller frame, characterized in that, it includes: a handle joint (403); a rear foot joint (407), arranged inside the handle joint (403), and having a locked state relatively fixed to the handle joint (403) and an unlocked state rotatable relative to the handle joint (403); a first unlocking device for switching the rear foot joint (407) to an unlocked state rotatable relative to the handle joint (403); a front foot joint (411), arranged inside the rear foot joint (407), and having a locked state relatively fixed to the rear foot joint (407) and an unlocked state rotatable relative to the rear foot joint (407); a second unlocking device, arranged on the handle joint (403), for driving the front foot joint (411) to switch to an unlocked state rotatable relative to the rear foot joint (407) when the handle joint (403) rotates a first preset angle relative to the rear foot joint (407); a first connecting joint (414), arranged inside the front foot joint (411), for connecting the seat, and having a locked state relatively fixed to the front foot joint (411) and an unlocked state rotatable relative to the front foot joint (411); and a third unlocking device, arranged on the rear foot joint (407), for driving the first connecting joint (414) to switch to an unlocked state rotatable relative to the front foot joint (411) when the rear foot joint (407) rotates a second preset angle relative to the front foot joint (411).

2. The folding joint (400) of a baby stroller frame according to claim 1, characterized in that, it further includes a first locking device arranged between the handle joint (403) and the rear foot joint (407), the first locking device is used to make the handle joint (403) and the rear foot joint (407) relatively fixed, and the first unlocking device is used to drive the first locking device to move so that the rear foot joint (407) switches to an unlocked state rotatable relative to the handle joint (403).

3. The folding joint (400) of a baby stroller frame according to claim 1, characterized in that, it further includes a second locking device arranged between the rear foot joint (407) and the front foot joint (411), the second locking device is used to make the rear foot joint (407) and the front foot joint (411) relatively fixed, and the second unlocking device is used to drive the second locking device to move so that the front foot joint (411) switches to an unlocked state rotatable relative to the rear foot joint (407).

4. The folding joint (400) of a baby stroller frame according to claim 3, characterized in that, The second unlocking device includes a first boss (418). The first boss (418) is arranged on the side of the handle joint (403) close to the rear foot joint (407), and the top surface of the first boss (418) is inclined relative to this side. The rear foot joint (407) is provided with a first through hole, and the first boss (418) passes through the first through hole. The first boss (418) is used to push the second locking device to move when the handle joint (403) rotates a first preset angle relative to the rear foot joint (407).

5. The folding joint (400) of the stroller frame according to claim 3, wherein, the second locking device includes a first gear (409), a first gear ring arranged in the front foot joint (411), and a second gear ring arranged in the rear foot joint (407). In the locked state where the front foot joint (411) and the rear foot joint (407) are relatively fixed, the first gear (409) meshes with both the first gear ring and the second gear ring; in the unlocked state where the front foot joint (411) is rotatable relative to the rear foot joint (407), the first gear (409) disengages from the position where it meshes with the first gear ring or the first gear (409) disengages from the position where it meshes with the second gear ring.

6. The folding joint (400) of the stroller frame according to claim 5, wherein, the second unlocking device includes a first boss (418). The first boss (418) is arranged on the side of the handle joint (403) close to the rear foot joint (407), and the top surface of the first boss (418) is inclined relative to this side. The rear foot joint (407) is provided with a first through hole, and the first boss (418) passes through the first through hole. The first boss (418) is used to push the first gear (409) to disengage from the position where it meshes with the second gear ring when the handle joint (403) rotates a first preset angle relative to the rear foot joint (407).

7. The folding joint (400) of the stroller frame according to claim 6, wherein, the second locking device further includes a push plate (408). The push plate (408) is arranged between the first gear (409) and the rear foot joint (407), and the first boss (418) pushes the first gear (409) by pushing the push plate (408).

8. The folding joint (400) of the stroller frame according to claim 1, wherein, it further includes a third locking device arranged between the front foot joint (411) and the first connecting joint (414). The third locking device is used to make the front foot joint (411) and the first connecting joint (414) relatively fixed, and the third unlocking device is used to drive the third locking device to move so that the first connecting joint (414) is switched to the unlocked state where it is rotatable relative to the front foot joint (411).

9. The stroller frame folding joint (400) according to claim 8, wherein, the third unlocking device includes a second boss (416) disposed on a side of the rear foot joint (407) close to the front foot joint (411). The front foot joint (411) is provided with a second through hole, and the second boss (416) passes through the second through hole. The second boss (416) is configured to push the third locking device to move when the rear foot joint (407) rotates relative to the front foot joint (411) by a second preset angle.

10. The stroller frame folding joint (400) according to claim 8, wherein, the third locking device includes: a first groove (420) disposed on the first connecting joint (414); and a first latch (413) movably connected to the front foot joint (411). In a locked state where the front foot joint (411) and the first connecting joint (414) are relatively fixed, the first latch (413) is inserted into the first groove (420). In an unlocked state where the front foot joint (411) is rotatable relative to the first connecting joint (414), the first latch (413) disengages from the first groove (420).

11. The stroller frame folding joint (400) according to claim 10, wherein, the third unlocking device includes a second boss (416) disposed on a side of the rear foot joint (407) close to the front foot joint (411). The front foot joint (411) is provided with a second through hole, and the second boss (416) passes through the second through hole. The second boss (416) is configured to push the first latch (413) out of the first groove (420) when the rear foot joint (407) rotates relative to the front foot joint (411) by a second preset angle.

12. The stroller frame folding joint (400) according to claim 11, wherein, a first inclined surface (423) inclined with respect to a moving direction of the first latch (413) is provided at an end of the first latch (413).

13. The stroller frame folding joint (400) according to claim 1, wherein, It further includes a first connecting joint (414) which is arranged inside the front foot joint (411) for connecting the seat, and has a locked state relatively fixed to the front foot joint (411) and an unlocked state rotatable relative to the front foot joint (411). A first stopper (415) is provided on the first connecting joint (414), and a second stopper (417) is provided on the handle joint (403). The second stopper (417) passes through the rear foot joint (407) and the front foot joint (411) and extends to the circumferential side of the first stopper (415). The second stopper (417) is used to rotate the first connecting joint (414) to a preset position by pushing the first stopper (415) when the stroller frame is unfolded.

14. A stroller frame, characterized in that, it includes the stroller frame folding joint (400) according to any one of claims 1 to 13.

15. A stroller frame, characterized in that, it includes a second connecting joint (703) and the stroller frame folding joint (400) according to any one of claims 1 to 13. The second connecting joint (703) is connected to the first connecting joint (414), and the second connecting joint (703) is used for installing the seat.

16. The stroller frame according to claim 15, characterized in that, the first connecting joint (414) includes a socket, the second connecting joint (703) includes a plug, and the plug is inserted into the socket to realize the connection between the first connecting joint (414) and the second connecting joint (703).

17. The stroller frame according to claim 16, characterized in that, the socket is symmetric about its vertical axis before and after, and the plug is symmetric about its vertical axis before and after.

18. The stroller frame according to claim 16, characterized in that, it further includes a fourth locking device and a fourth unlocking device. The fourth locking device is arranged between the plug and the socket and is used to make the plug and the socket relatively fixed, and the fourth unlocking device is used to drive the fourth locking device to move so that the plug and the socket can move relatively.

19. The stroller frame according to claim 18, characterized in that, the fourth locking device includes a first slider (704) and a retaining pin (705) arranged on the plug. The first slider (704) is provided with a long hole inclined with respect to the relative movement direction of the plug and the socket. The retaining pin (705) is inserted into the long hole and moves in the long hole. A locking notch is provided in the socket. When the retaining pin (705) is inserted into the locking notch, the plug and the socket are relatively fixed. The fourth unlocking device is used to drive the first slider (704) to move, thereby driving the retaining pin (705) to disengage from the locking notch.

20. The stroller frame according to claim 15, characterized in that, It further includes a backrest joint (709), a fifth locking device, and a fifth unlocking device. The backrest joint (709) is disposed inside the second connecting joint (703). The fifth locking device is arranged between the backrest joint (709) and the second connecting joint (703). The fifth locking device is configured to relatively fix the backrest joint (709) and the second connecting joint (703). The fifth unlocking device is used to drive the fifth locking device to move so that the backrest joint (709) and the second connecting joint (703) can move relative to each other.

21. The stroller frame according to claim 20, wherein, the fifth locking device includes a second gear (708), a third toothed ring disposed on the backrest joint (709), and a fourth toothed ring disposed on the second connecting joint (703). In the locked state where the backrest joint (709) and the second connecting joint (703) are relatively fixed, the second gear (708) meshes with both the third toothed ring and the fourth toothed ring simultaneously; in the unlocked state where the backrest joint (709) is rotatable relative to the second connecting joint (703), the second gear (708) disengages from the position where it meshes with the third toothed ring or the second gear (708) disengages from the position where it meshes with the fourth toothed ring.

22. The stroller frame according to claim 21, wherein, the fifth unlocking device includes a second flexible member (713), a second slider (712), and a third slider (711). The second flexible member (713) is connected to the second slider (712). The second slider (712) is provided with a first tooth, and the third slider (711) is provided with a second tooth. The first tooth has a second inclined surface inclined with respect to the movement direction of the first tooth, and the second tooth has a third inclined surface inclined with respect to the movement direction of the second tooth. The first tooth and the second tooth mesh with each other, and the second inclined surface contacts the third inclined surface. The third slider (711) is disposed inside the backrest joint (709) and contacts the second gear (708). When the second flexible member (713) is pulled, it drives the second slider (712) to move. The second slider (712) drives the third slider (711) to move axially along the backrest joint (709) through the first tooth, and further pushes the second gear (708) to disengage from the position where it meshes with the third toothed ring.

23. The stroller frame according to claim 20, wherein, Further included is a footrest joint (715), the footrest joint (715) is disposed inside the backrest joint (709), the footrest joint (715) is provided with a third stopper (718), the backrest joint (709) is provided with a fourth stopper (719), the third stopper (718) and the fourth stopper (719) are in contact with each other and are used to cause the footrest joint (715) to move together with the backrest joint (709) when the backrest joint (709) moves backward.

24. The stroller frame according to claim 23, wherein, further included is an armrest joint (717), the armrest joint (717) is disposed inside the footrest joint (715), the armrest joint (717) is provided with a fifth stopper (716), the footrest joint (715) is provided with a third through hole (721), the backrest joint (709) is provided with a second groove (720), the fifth stopper (716) passes through the third through hole (721) and is inserted into the second groove (720), when the backrest joint (709) folds relative to the footrest joint (715), the fifth stopper (716) drives the armrest joint (717) to fold towards the footrest joint (715).

25. A stroller, wherein, it includes the stroller frame according to any one of claims 14 to 24.

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