CN111746618A

CN111746618A - Baby carriage frame folding joint, baby carriage frame and baby carriage

Info

Publication number: CN111746618A
Application number: CN201910249580.0A
Authority: CN
Inventors: 刘修平
Original assignee: Unitron Enterprises Zhuhai Co ltd
Current assignee: Unitron Enterprises Zhuhai Co ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2020-10-09

Abstract

The invention relates to a baby carriage frame folding joint, a baby carriage frame and a baby carriage, wherein the baby carriage frame folding joint (400) comprises: a handle joint (403); a rear foot joint (407) provided on the inner side of the handlebar joint and having a locked state fixed relative to the handlebar joint and an unlocked state rotatable relative to the handlebar joint; the first unlocking device is used for switching the rear foot joint to an unlocking state which can rotate relative to the handlebar joint; a forefoot joint (411) that is provided on the inner side of the hindfoot joint and that has a locked state in which the forefoot joint is fixed relative to the hindfoot joint and an unlocked state in which the forefoot joint is rotatable relative to the hindfoot joint; and the second unlocking device is arranged on the handle joint and used for driving the front foot joint to be switched to an unlocking state which can be rotated relative to the rear foot joint when the handle joint rotates relative to the rear foot joint by a first preset angle. The baby carriage frame comprises a folding joint. The stroller includes a stroller frame. The safety of the frame is better when the frame is folded.

Description

Baby carriage frame folding joint, baby carriage frame and baby carriage

Technical Field

The invention relates to the technical field of a baby carriage, in particular to a baby carriage frame folding joint, a baby carriage frame and a baby carriage.

Background

At present, the application of the baby carriage is very wide, most of infant care families use the baby carriage to carry a baby, and particularly when the baby carriage is far away in the road, the baby carriage can be used for carrying the baby, so that great strength can be saved.

The existing baby carriage is usually foldable, but when the baby carriage is folded, once an unlocking button is operated, all joints are in an unlocking state, most parts of the baby carriage frame are in a movable state, and if the baby carriage frame is carelessly operated, accidental injuries such as clamping and the like to a riding baby and an operator can be caused, so that the safety of the baby carriage frame is affected.

Disclosure of Invention

The invention aims to provide a baby carriage frame folding joint, a baby carriage frame and a baby carriage, which can improve the safety and convenience of operation of the baby carriage frame during folding as much as possible.

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

a handle joint;

the rear foot joint is arranged on the inner side of the handlebar joint and has a locking state fixed relative to the handlebar joint and an unlocking state capable of rotating relative to the handlebar joint;

the first unlocking device is used for switching the rear foot joint to an unlocking state which can rotate relative to the handlebar joint;

a forefoot joint provided on the inner side of the hindfoot joint and having a locked state fixed relative to the hindfoot joint and an unlocked state rotatable relative to the hindfoot joint; and

and the second unlocking device is arranged on the handle joint and used for driving the front foot joint to be switched to an unlocking state which can be rotated relative to the rear foot joint when the handle joint rotates relative to the rear foot joint by a first preset angle.

Optionally, the stroller frame folding joint further comprises a first locking device arranged between the handlebar joint and the rear foot joint, the first locking device is used for enabling the handlebar joint and the rear foot joint to be relatively fixed, and the first unlocking device is used for driving the first locking device to move so as to enable the rear foot joint to be switched to an unlocking state capable of rotating relative to the handlebar joint.

Optionally, the stroller frame folding joint further comprises a second locking device arranged between the rear foot joint and the front foot joint, the second locking device is used for enabling the rear foot joint and the front foot joint to be relatively fixed, and the second unlocking device is used for driving the second locking device to move so as to enable the front foot joint to be switched to an unlocking state capable of rotating relative to the rear foot joint.

Optionally, the second unlocking device includes a first boss, the first boss is disposed on a side surface of the handle joint close to the rearfoot joint, a top surface of the first boss is inclined relative to the side surface, the rearfoot joint is provided with a first through hole, the first boss passes through the first through hole, and the first boss is used for pushing the second locking device to move when the handle joint rotates relative to the rearfoot joint by a first preset angle.

Optionally, the second locking device comprises a first gear, a first gear ring arranged in the forefoot joint and a second gear ring arranged in the rearfoot joint, the first gear and the first gear ring and the second gear ring are simultaneously engaged in a locked state in which the forefoot joint and the rearfoot joint are relatively fixed; in an unlocked state in which the forefoot joint is rotatable relative to the rearfoot joint, the first gear wheel is moved out of a position in which it meshes with the first gear ring or the first gear wheel is moved out of a position in which it meshes with the second gear ring.

Optionally, the second unlocking device includes a first boss, the first boss is disposed on a side surface of the handle joint close to the rearfoot joint, a top surface of the first boss is inclined with respect to the side surface, the rearfoot joint is provided with a first through hole, the first boss passes through the first through hole, and the first boss is configured to push the first gear to leave a position engaged with the second gear ring when the handle joint rotates by a first preset angle with respect to the rearfoot joint.

Optionally, the second locking device further comprises a push plate disposed between the first gear and the hind foot joint, the first boss pushing the first gear by pushing the push plate.

Optionally, the stroller frame folding joint further comprises:

the first connecting joint is arranged on the inner side of the front foot joint, is used for connecting the seat and has a locking state which is relatively fixed with the front foot joint and an unlocking state which can rotate relative to the front foot joint; and

and the third unlocking device is arranged on the hind foot joint and used for driving the first connecting joint to be switched to an unlocking state which can be rotated relative to the forefoot joint when the hind foot joint rotates relative to the forefoot joint by a second preset angle.

Optionally, the stroller frame folding joint further comprises a third locking device arranged between the front foot joint and the first connecting joint, the third locking device is used for enabling the front foot joint and the first connecting joint to be relatively fixed, and the third unlocking device is used for driving the third locking device to move so as to enable the first connecting joint to be switched to an unlocking state capable of rotating relative to the front foot joint.

Optionally, the third unlocking device includes a second boss, the second boss is disposed on a side surface of the hind foot joint close to the forefoot joint, the forefoot joint is provided with a second through hole, the second boss passes through the second through hole, and the second boss is configured to push the third locking device to move when the hind foot joint rotates by a second preset angle relative to the forefoot joint.

Optionally, the third locking means comprises:

the first groove is arranged on the first connecting joint; and

the first bolt is movably connected with the front foot joint and is inserted into the first groove in a locking state that the front foot joint and the first connecting joint are relatively fixed; under the unlocking state that the front foot joint can rotate relative to the first connecting joint, the first bolt is separated from the first groove.

Optionally, the third unlocking device includes a second boss, the second boss is disposed on a side surface of the rear foot joint close to the front foot joint, the front foot joint is provided with a second through hole, the second boss penetrates through the second through hole, and the second boss is used for pushing the first bolt to leave the first groove when the rear foot joint rotates a second preset angle relative to the front foot joint.

Optionally, the end of the first pin is provided with a first inclined surface inclined with respect to the moving direction of the first pin.

Optionally, the stroller frame folding joint further includes a first connection joint, the first connection joint is disposed on an inner side of the front foot joint and used for connecting the seat, and has a locking state fixed relative to the front foot joint and an unlocking state rotatable relative to the front foot joint, the first connection joint is provided with a first stop block, the handle joint is provided with a second stop block, the second stop block passes through the rear foot joint and the front foot joint and extends to a circumferential side surface of the first stop block, and the second stop block is used for enabling the first connection joint to rotate to a preset position by pushing the first stop block when the stroller frame is unfolded.

According to a second aspect of the present invention, a stroller frame is provided, which includes the above stroller frame folding joint.

According to a third aspect of the present invention, a stroller frame is provided, which includes a second joint and the above stroller frame folding joint, the second joint is connected with the first joint, and the second joint is used for mounting a seat.

Optionally, the first joint comprises a socket and the second joint comprises a plug, and the plug is inserted into the socket to connect the first joint and the second joint.

Optionally, the socket is symmetrical back and forth about its vertical axis and the plug is symmetrical back and forth about its vertical axis.

Optionally, the stroller frame further comprises a fourth locking device disposed between the plug and the socket for relatively fixing the plug and the socket, and a fourth unlocking device for driving the fourth locking device to move to enable the plug and the socket to move relatively.

Optionally, the fourth locking device includes a first slider and a bayonet lock, the first slider is provided with a strip hole, the strip hole is obliquely arranged relative to the relative movement direction of the plug and the socket, the bayonet lock is inserted into the strip hole and moves in the strip hole, a locking notch is arranged in the socket, the plug and the socket are relatively fixed when the bayonet lock is inserted into the locking notch, and the fourth unlocking device is used for driving the first slider to move, so as to drive the bayonet lock to disengage from the locking notch.

Optionally, the stroller frame further comprises a backrest joint, a fifth locking device and a fifth unlocking device, the backrest joint is arranged on the inner side of the second connecting joint, the fifth locking device is arranged between the backrest joint and the second connecting joint, the fifth locking device is used for enabling the backrest joint and the second connecting joint to be relatively fixed, and the fifth unlocking device is used for driving the fifth locking device to move so as to enable the backrest joint and the second connecting joint to move relatively.

Optionally, the fifth locking device comprises a second gear, a third gear ring arranged on the backrest joint and a fourth gear ring arranged on the second connecting joint, and the second gear is simultaneously meshed with the third gear ring and the fourth gear ring in a locking state that the backrest joint and the second connecting joint are relatively fixed; in an unlocked state in which the backrest joint is rotatable relative to the second connection joint, the second gear is away from a position meshing with the third gear ring or the second gear is away from a position meshing with the fourth gear ring.

Optionally, the fifth unlocking device includes a second flexible component, a second slider and a third slider, the second flexible component is connected to the second slider, the second slider is provided with a first tooth, 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, the second tooth has a third inclined surface inclined with respect to the movement direction of the second tooth, the first tooth is engaged with the second tooth, the second inclined surface contacts with the third inclined surface, the third slider is disposed in the backrest joint and contacts with the second gear, the second flexible component drives the second slider to move when being pulled, and the second slider drives the third slider to move along the axial direction of the backrest joint through the first tooth, so as to push the second gear to leave the position engaged with the third gear ring.

Optionally, the baby carriage frame further comprises a pedal joint, the pedal joint is arranged on the inner side of the backrest joint, the pedal joint is provided with a third stop, the backrest joint is provided with a fourth stop, and the third stop and the fourth stop are in contact with each other and are used for enabling the pedal joint to move along with the backrest joint when the backrest joint moves backwards.

Optionally, the stroller frame further comprises a handrail joint, the handrail joint is arranged on the inner side of the pedal joint, the handrail joint is provided with a fifth stop dog, the pedal joint is provided with a third through hole, the backrest joint is provided with a second groove, the fifth stop dog penetrates through the third through hole and is inserted into the second groove, and the backrest joint drives the handrail joint to be folded towards the pedal joint through the fifth stop dog when being folded relative to the pedal joint.

According to a fourth aspect of the invention, a stroller is provided, comprising the stroller frame.

Based on the technical scheme, in the embodiment of the frame folding joint of the baby carriage, the rear foot joint can be switched to the unlocking state capable of rotating relative to the handle joint by operating the first unlocking device, the second unlocking device is triggered when the handle joint rotates relative to the rear foot joint by the first preset angle, the second unlocking device can drive the front foot joint to be switched to the unlocking device capable of rotating relative to the rear foot joint, the front foot joint can be folded relative to the rear foot joint, and therefore the folding of the handle joint, the rear foot joint and the front foot joint is achieved. In the folding process, the second unlocking device is not triggered after the first unlocking device is unlocked, and the second unlocking device is triggered after the handle joint rotates relative to the rear foot joint by a first preset angle, so that all joints in the folding joints cannot enter an unlocking state at the same time, accidental injuries such as squeezing and clamping on a riding baby or an operator are effectively avoided, and the operation safety is improved; the second unlocking device can be automatically triggered after the handle joint rotates by the first preset angle, and an unlocking button does not need to be further operated, so that the convenience of operation can be effectively improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic structural view of one embodiment of a stroller frame of the present invention.

Fig. 2 is a schematic structural view of another embodiment of the stroller frame of the present invention.

Fig. 3 is a schematic view of the folded stroller frame according to one embodiment of the present invention.

Fig. 4 is a schematic view of a folded stroller frame according to another embodiment of the present invention.

Fig. 5 is a partial schematic view of a stroller frame according to an embodiment of the present invention.

Fig. 6 is an exploded view of one embodiment of the frame folding joint of the stroller of the present invention.

Fig. 7 is a schematic structural view of a handle joint and a first locking device in an embodiment of a stroller frame folding joint of the present invention.

Fig. 8 is a schematic structural view of a rear foot joint in an embodiment of a stroller frame folding joint of the present invention.

Fig. 9 is a schematic structural view of a handle joint in an embodiment of a stroller frame folding joint of the present invention.

Fig. 10 is a schematic structural view of the first gear, the push plate and the second elastic member in one embodiment of the foldable joint of the stroller frame of the present invention.

Fig. 11 is a schematic structural view of a first joint in an embodiment of a stroller frame folding joint of the present invention.

Fig. 12 is a schematic structural view of a first plug in an embodiment of a baby carriage frame folding joint according to the present invention.

Fig. 13 is a schematic view of a fitting structure of the second boss and the first pin in an embodiment of the baby carriage frame folding joint of the present invention.

Fig. 14 is a schematic view of a matching structure of the handle joint and the first connecting joint in an embodiment of the stroller frame folding joint of the present invention.

FIG. 15 is a schematic view of the seat mount of one embodiment of the stroller frame of the present invention.

FIG. 16 is a first folded state of the seat mount of one embodiment of the stroller frame of the present invention.

FIG. 17 is a second folded state of the seat mount of one embodiment of the stroller frame of the present invention.

Fig. 18 is a schematic view of the seat mount fully folded in one embodiment of the stroller frame of the present invention.

Fig. 19 is an exploded view of the folding joint in one embodiment of the stroller frame of the present invention.

Fig. 20 is a schematic view showing an assembled structure of a back joint, a footrest joint and a handrail joint in one embodiment of the stroller frame of the present invention.

Fig. 21 is a schematic view of the second joint of the stroller frame according to an embodiment of the present invention.

Fig. 22 is a schematic view showing the fitting structure among the back joint, the footrest joint and the armrest joint in an embodiment of the stroller frame according to the present invention.

In the figure:

100. a handle bar; 200. a rear foot bar; 300. a front foot bar; 400. folding joints; 500. a back rest rod; 600. a foot lever; 700. a folding joint; 800. a grab rail; 900. a ceiling pole;

101. a folding button; 501. a folding button;

401. a protective cover; 402. a first rivet; 403. a handle joint; 404. a second bolt; 405. a first flexible member; 406. a first elastic member; 407. a hindfoot joint; 408. pushing the plate; 409. a first gear; 410. a second elastic member; 411. a forefoot joint; 412. a third elastic member; 413. a first latch; 414. a first connecting joint; 415. a first stopper; 416. a second boss; 417. a second stopper; 418. a first boss; 419. a third groove; 420. a first groove; 421. a second boss; 422. a fourth via hole; 423. a first inclined plane;

701. a quick release button; 702. a second rivet; 703. a second connecting joint; 704. a first slider; 705. a bayonet lock; 706. a fourth elastic member; 707. a fifth elastic member; 708. a second gear; 709. a backrest joint; 710. a ceiling joint; 711. a third slider; 712. a second slider; 713. a second flexible member; 714. a sixth elastic member; 715. a pedal joint; 716. a fifth stop block; 717. an armrest joint; 718. a third stopper; 719. a fourth stopper; 720. a second groove; 721. a third via.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the scope of the invention.

Referring to fig. 1 to 6, in an exemplary embodiment of a stroller frame folding joint 400 provided in the present invention, the folding joint 400 includes a handlebar 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 disposed inside the handlebar joint 403, the rear foot joint 407 has a locked state fixed relative to the handlebar joint 403 and an unlocked state rotatable relative to the handlebar joint 403, the first unlocking device is configured to switch the rear foot joint 407 to an unlocked state rotatable relative to the handlebar joint 403, the front foot joint 411 is disposed inside the rear foot joint 407, the front foot joint 411 has a locked state fixed relative to the rear foot joint 407 and an unlocked state rotatable relative to the rear foot joint 407, the second unlocking device is disposed on the handlebar joint 403, and the second unlocking device is configured to drive the front foot joint 411 to switch to an unlocked state rotatable relative to the rear foot joint 407 when the handlebar joint 403 rotates relative to the rear foot joint 407 by a first predetermined angle Segment 407 is a rotatable unlocked state.

In the above exemplary embodiment, the inner side refers to a side near the center of the stroller frame.

In the above exemplary embodiment, the rear foot joint 407 may be switched to the unlocked state rotatable with respect to the handlebar joint 403 by operating the first unlocking device, the second unlocking device may be triggered when the handlebar joint 403 rotates by a first preset angle with respect to the rear foot joint 407, and the second unlocking device may drive the front foot joint 411 to be switched to the unlocking device rotatable with respect to the rear foot joint 407, so that the front foot joint 411 may be folded with respect to the rear foot joint 407, thereby achieving folding of the handlebar joint 403, the rear foot joint 407, and the front foot joint 411. In the folding process, the second unlocking device is not triggered after the first unlocking device is unlocked, and the second unlocking device is triggered after the handle joint 403 rotates relative to the rear foot joint 407 by a first preset angle, so that all joints in the folding joints cannot enter an unlocking state at the same time, accidental injuries such as squeezing and clamping on a riding baby or an operator are effectively avoided, and the operation safety is improved; the second unlocking device can be automatically triggered after the handle joint rotates by the first preset angle, and an unlocking button does not need to be further operated, so that the convenience of operation can be effectively improved.

In the above exemplary embodiment, the first preset angle may be an angle at which the handle joint 403 and the hindfoot joint 407 are completely folded and the handle joint 403 and the hindfoot joint 407 are in contact.

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 for connecting the seat, the first connecting joint 414 has a locked state fixed relative to the front foot joint 411 and an unlocked state rotatable relative to the front foot joint 411, the third unlocking device is disposed on the rear foot joint 407, and the third unlocking device is used for driving the first connecting joint 414 to switch to the unlocked state rotatable relative to the front foot joint 411 when the rear foot joint 407 rotates relative to the front foot joint 411 by a second preset angle.

The second preset angle may be an angle at which the hindfoot joint 407 and the forefoot joint 411 are completely folded and the hindfoot joint 407 and the forefoot joint 411 are in contact.

By providing the third unlocking device, when the handle joint 403, the rear foot joint 407, and the front foot joint 411 are completely folded and the rear foot joint 407 rotates relative to the front foot joint 411 by a second preset angle, the third unlocking device can drive the first connecting joint 414 to switch to the unlocked state rotatable relative to the front foot joint 411, so that the first connecting joint 414 can rotate relative to the front foot joint 411, and thus components such as a seat connected to the first connecting joint 414 can be folded relative to the front foot joint 411, the rear foot joint 407, and the handle joint 403.

Therefore, the unlocking of the third unlocking device is triggered when the third unlocking device is folded to a certain degree, so that the joint in the folding joint can not enter the unlocking state at the same time, and the operation safety is effectively improved.

In an alternative embodiment of the stroller frame, the stroller frame further comprises a folding joint 700, the folding joint 700 comprises a second connecting joint 703, the second connecting joint 703 is connected with 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.

The invention also provides a baby carriage frame which comprises the folding joint; the invention further provides a baby carriage which comprises the baby carriage frame.

The technical effects of the baby carriage frame folding joint are also applicable to baby carriage frames and baby carriages, and are not described in detail herein.

The following is a detailed description of the specific structure of the stroller frame folding joint, the stroller frame and the stroller of an embodiment of the present invention:

as shown in fig. 1 to 5, the stroller frame includes a handle bar 100, a rear foot bar 200, a front foot bar 300, a folding joint 400, a backrest bar 500, a foot bar 600, a folding joint 700, a grab rail bar 800, and a ceiling bar 900.

The handle bar 100, the rear foot bar 200 and the front foot bar 300 are connected by a folding joint 400, the back rest bar 500, the foot bar 600 and the grab bar 800 are connected by a folding joint 700, and the ceiling bar 900 is mounted on the back rest bar 500. The folding joint 400 is connected with the folding joint 700.

The handle bar 100, the rear foot bar 200, the front foot bar 300, the back rest bar 500, the foot bar 600, the grab bar 800, and the ceiling bar 900 may be solid or hollow.

The handle bar 100, the back rest bar 500, the foot rest bar 600, the grab bar 800, and the ceiling bar 900 are all U-shaped. The rear foot bar 200 and the front foot bar 300 each include two, which are respectively provided on the left and right sides of the frame. The number of the folding joints 400 and the number of the folding joints 700 are two, and the two folding joints are respectively arranged on the left side and the right side of the frame.

As shown in fig. 6 and fig. 19, the folding joint 400 includes a first connecting joint 414, the folding joint 700 includes a second connecting joint 703, and the first connecting joint 414 is connected to the second connecting joint 703 to connect the folding joint 400 and the folding joint 700.

As shown in fig. 6, the folding joint 400 includes a handlebar joint 403, a rear foot joint 407, a front foot joint 411, and a first connecting joint 414. The handle bar 100 is mounted on the handle joint 403, the hindfoot bar 200 is mounted on the hindfoot joint 407, the forefoot bar 300 is mounted on the forefoot joint 411, and the folding joint 700 is connected to the first connecting joint 414.

A first locking device is provided between the handlebar joint 403 and the rearfoot joint 407, the first locking device is configured to fix the handlebar joint 403 and the rearfoot joint 407 relative to each other, and the first unlocking device is configured to drive the first locking device to move so as to switch the rearfoot joint 407 to an unlocked state that is rotatable relative to the handlebar joint 403.

The first locking device comprises a second bolt 404 and a third groove 419, as shown in fig. 8, the third groove 419 is arranged on the rear foot joint 407, the second bolt 404 is movably connected with the handle joint 403, and the second bolt 404 is inserted into the third groove 419 in a locking state that the rear foot joint 407 and the handle joint 403 are fixed relatively; in the unlocked state in which the rear foot joint 407 is rotatable relative to the handlebar joint 403, the second latch 404 disengages from the third recess 419.

As shown in fig. 7, the first locking device further includes a first elastic member 406, the first elastic member 406 is disposed in the handle joint 403 and abuts against the second pin 404, the first elastic member 406 is used for keeping the second pin 404 inserted into the third groove 419 and restoring the second pin 404 after the second pin 404 is disengaged from the third groove 419.

The first unlocking device comprises a first flexible member 405, the first flexible member 405 is connected with a second latch 404, the second latch 404 is driven to move relative to a third groove 419 when the first flexible member 405 is pulled, and when the second latch 404 is separated from the third groove 419, the locking between the handle joint 403 and the rear foot joint 407 is released under the action of the first flexible member 405, so that the handle joint 403 can rotate relative to the rear foot joint 407.

The first flexible member 405 penetrates into the handle bar 100, the folding button 101 is disposed on the upper portion of the handle bar 100, and a user can pull the first flexible member 405 by pressing the folding button 101, so that the second pin 404 is disengaged from the third groove 419, and the locking between the handle joint 403 and the rear foot joint 407 is released.

And a second locking device between the hindfoot joint 407 and the forefoot joint 411, wherein the second locking device is used for fixing the hindfoot joint 407 and the forefoot joint 411 relatively, and the second unlocking device is used for driving the second locking device to move when the handlebar joint 403 rotates relative to the hindfoot joint 407 by a first preset angle so as to enable the forefoot joint 411 to be switched to an unlocking state which can rotate relative to the hindfoot joint 407.

As shown in fig. 7 and 9, the second unlocking means includes a first boss 418, the first boss 418 is disposed on a side surface of the handlebar joint 403 close to the rearfoot joint 407, and a top surface of the first boss 418 is inclined with respect to the side surface, the rearfoot joint 407 is provided with a first through hole, the first boss 418 passes through the first through hole, and the first boss 418 is used for pushing the second locking means to move when the handlebar joint 403 rotates by a first preset angle with respect to the rearfoot joint 407.

The first boss 418 is provided on a side surface of the handlebar joint 403 close to the rearfoot joint 407, and the first boss 418 extends axially from the side surface in a direction close to the rearfoot joint 407 in the circumferential direction, and a top surface of the first boss 418 is inclined with respect to the side surface. The number of the first bosses 418 is two, and the first bosses are respectively arranged on both sides of the second pin 404. The first boss 418 is arcuate.

The second locking device comprises 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, and under the locking state that the front foot joint 411 and the rear foot joint 407 are relatively fixed, the first gear 409 is simultaneously meshed with the first gear ring and the second gear ring; in the unlocked state in which the forefoot joint 411 is rotatable relative to the rearfoot joint 407, the first gear 409 is away from the position meshing with the first gear ring or the first gear 409 is away from the position meshing with the second gear ring. The first boss 418 is used to push the first gear 409 away from engagement with the second gear ring when the handlebar joint 403 is rotated a first predetermined angle relative to the rearfoot joint 407.

As shown in fig. 10, the second locking means further includes a push plate 408, the push plate 408 is disposed between the first gear 409 and the hindfoot joint 407, and the first boss 418 pushes the first gear 409 by pushing the push plate 408.

The pusher plate 408 includes a plate portion and a tooth portion, and the tooth portion is connected to the plate portion. By providing the teeth, the maximum thickness of the pusher plate 408 can be increased while facilitating a reduction in the overall weight of the pusher plate 408. By providing teeth, contact with the first boss 418 is facilitated and the first gear 409 is pushed under the action of the first boss 418.

The second locking means further includes a second elastic member 410, and the second elastic member 410 serves to maintain the first gear 409 at a position where it is simultaneously engaged with the first ring gear and the second ring gear, and to restore the first gear 409 when it is separated from the position where it is engaged with the first ring gear or the position where it is engaged with the second ring gear.

And a third locking device between the forefoot joint 411 and the first connecting joint 414, wherein the third locking device is used for fixing the forefoot joint 411 and the first connecting joint 414 relatively, and the third unlocking device is used for driving the third locking device to move so as to enable the first connecting joint 414 to be switched to an unlocking state which can be rotated relative to the forefoot joint 411.

The third unlocking means comprises a second boss 416, the second boss 416 is arranged on the side surface 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, the second boss 416 penetrates through the second through hole, and the second boss 416 is used for pushing the third locking means to move when the rear foot joint 407 rotates relative to the front foot joint 411 by a second preset angle.

The second boss 416 is cylindrical, and the second boss 416 is disposed near the outer edge of the hindfoot joint 407. The second boss 416 extends axially from the side of the rear foot joint 407 adjacent to the forefoot joint 411 in the direction adjacent to the forefoot joint 411.

As shown in fig. 11, the third locking device includes a first groove 420 and a first pin 413, the first groove 420 is disposed on the first joint 414, the first pin 413 is movably connected with the front foot joint 411, and the first pin 413 is inserted into the first groove 420 in a locking state where the front foot joint 411 and the first joint 414 are fixed relative to each other; in an unlocked state where the forefoot joint 411 is rotatable with respect to the first connection joint 414, the first latch 413 is disengaged from the first recess 420. The second protrusion 416 is used to push the first pin 413 to leave the first groove 420 when the rear joint 407 rotates relative to the front joint 411 by a second predetermined angle.

As shown in fig. 12, the first pin 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 pin 413 is mounted on the front foot joint 411 through the fourth through hole 422, the fourth through hole 422 is an oblong hole, and the first pin 413 can move relative to the front foot joint 411.

The length of the second through hole is larger than the width of the second boss 416, and when the rear foot joint 407 rotates relative to the front foot joint 411, the second boss 416 moves in 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 with the end of the first pin 413, and pushes the first pin 413 to leave the first groove 420.

The third locking device further includes a third elastic member 412, and the third elastic member 412 abuts against the first pin 413, so as to keep the first pin 413 at a position inserted into the first groove 420 and reset the first pin 413 after the first pin 413 is disengaged from the first groove 420.

As shown in fig. 13, in order to avoid direct collision, the end of the first pin 413 is provided with a first slope 423 inclined with respect to the moving direction of the first pin 413. By providing the first inclined surface 423, when the second boss 416 is moved to a position where the foot joint 407 contacts with the end of the first pin 413, the first pin 413 can be pushed slowly along the first inclined surface 423, so as to prevent the second boss 416 and the first pin 413 from directly colliding, and damage to the second boss 416 or the first pin 413 is avoided.

As shown in fig. 14, the first coupling joint 414 is disposed inside the front foot joint 411, the first coupling joint 414 has a locked state fixed relative to the front foot joint 411 and an unlocked state rotatable relative to the front foot joint 411, the first coupling joint 414 is provided with a first stopper 415, the handle joint 403 is provided with a second stopper 417, the second stopper 417 extends to a circumferential side of the first stopper 415 through the rear foot joint 407 and the front foot joint 411, and the second stopper 417 is configured to rotate the first coupling joint 414 to a predetermined position by pushing the first stopper 415 when the stroller frame is unfolded.

By providing the first stopper 415 and the second stopper 417, it is ensured that the first connecting joint 414 can be unfolded to a predetermined position when the stroller frame is unfolded.

The folding joint 400 further comprises a protective cover 401 and a first rivet 402, wherein the protective cover 401 is arranged at the outermost side and is used for protecting components in 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.

Therefore, when folding, the folding button 101 can be pressed first, the first flexible member 405 is pulled, and the second pin 404 is driven to disengage from the third groove 419, so that the rear foot joint 407 and the handle joint 403 are unlocked; pressing down the handle joint 403 to fold the handle joint 403 toward the hind foot joint 407; when the handle joint 403 and the rear foot joint 407 are completely folded and contacted, the first boss 418 pushes the push plate 408, and the push plate 408 pushes the first gear 409 to leave a position meshed with the second gear ring, so that the locking between the rear foot joint 407 and the front foot joint 411 is released; the rear foot joint 407 and the front foot joint 411 are folded relatively, when the rear foot joint 407 and the front foot joint 411 are completely folded and contacted, the second boss 416 drives the first bolt 413 to be disengaged from the first groove 420, so that the locking between the front foot joint 411 and the first connecting joint 414 is released, and the component connected with the first connecting joint 414 can be folded relative to the front foot joint 411.

To facilitate connection and disconnection of the first connection joint 414 and the second connection joint 703, the first connection joint 414 includes a socket, and the second connection joint 703 includes a plug inserted into the socket to enable connection of the first connection joint 414 and the second connection joint 703.

By arranging the socket and the plug, the first connecting joint 414 and the second connecting joint 703 can be quickly connected, and quick disassembly is facilitated.

The baby carriage frame further comprises a fourth locking device and a fourth unlocking device, the fourth locking device is arranged between the plug and the socket and is used for enabling the plug and the socket to be relatively fixed, and the fourth unlocking device is used for driving the fourth locking device to move so as to enable the plug and the socket to move relatively.

As shown in fig. 19, the fourth locking device includes a first sliding block 704 and a locking pin 705, the first sliding block 704 is provided with a long hole inclined with respect to the relative movement direction of the plug and the socket, the locking pin 705 is inserted into the long hole and moves in the long hole, a locking notch is arranged in the socket, the plug and the socket are relatively fixed when the locking pin 705 is inserted into the locking notch, and the fourth unlocking device is used for driving the first sliding block 704 to move, so as to drive the locking pin 705 to disengage from the locking notch.

The fourth locking means further comprises a fourth resilient member 706, the fourth resilient member 706 being adapted to retain the first slider 704 in a position in which the detent 705 is inserted into the locking notch and to reset the first slider 704 after the detent has been disengaged from the locking notch.

The fourth unlocking device comprises a quick release button 701, the first sliding block 704 can be driven to move upwards by pressing the quick release button 701, so that the bayonet 705 is driven to retract through the strip hole, the bayonet 705 is separated from the locking notch, the plug can be pulled out at the moment, the first connecting joint 414 and the second connecting joint 703 are disconnected, and the seat is detached; after the quick release button 701 is released, under the action of the fourth elastic element 706, the first slider 704 is reset, and drives the bayonet 705 to extend out and be clamped into the bayonet, so that the first connection joint 414 and the second connection joint 703 are connected, and the installation and the fixation of the seat are realized.

The socket is symmetrical back and forth about its vertical axis and the plug is symmetrical back and forth about its vertical axis. The front-rear direction herein refers to a direction from the front foot bar 300 to the rear foot bar 200. The advantage of setting up like this is, the cross fit between the left and right sides socket and the plug on the frame of being convenient for, can realize the two-way installation of seat.

As shown in fig. 1, the seat mounting frame composed of the back rest lever 500, the foot rest lever 600, the folding joint 700, the grab bar 800 and the ceiling lever 900 is positively mounted on the vehicle body composed of the handle lever 100, the rear foot lever 200, the front foot lever 300 and the folding joint 400;

as shown in fig. 2, the seat mount is reversely mounted on the vehicle body;

as shown in fig. 3, the seat mount is mounted on the vehicle body in a forward direction and is fully folded;

as shown in fig. 4, the seat mount is reversely mounted on the vehicle body and is completely folded.

Further, the seat mount may also be fully folded.

Fig. 15 is a schematic view of the seat mount in the deployed state. As shown in fig. 16, the seat mount is in a first, folded state; as shown in fig. 17, the seat mount is in a second, folded state; as shown in fig. 18, the seat mount is in a fully folded condition.

As shown in fig. 19, 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 for fixing the backrest joint 709 and the second connecting joint 703 relatively, and the fifth unlocking device is used for driving the fifth locking device to move so as to enable the backrest joint 709 and the second connecting joint 703 to move relatively.

The fifth locking device comprises a second gear 708, a third gear ring arranged on the backrest joint 709 and a fourth gear ring arranged on the second connecting joint 703, and in a locking state that the backrest joint 709 and the second connecting joint 703 are relatively fixed, the second gear 708 is simultaneously meshed with the third gear ring and the fourth gear ring; in the unlocked state in which the backrest joint 709 is rotatable relative to the second connection joint 703, the second gear 708 is away from the position meshing with the third gear ring or the second gear 708 is away from the position meshing with the fourth gear ring.

The fifth locking means further includes a fifth elastic member 707, and the fifth elastic member 707 is provided outside the second gear 708, and serves to hold the second gear 708 in a position where it is engaged with the third ring gear and the fourth ring gear, and to reset the second gear 708 when the second gear 708 is moved from the position where it is engaged with the third ring gear or the position where it is engaged with the fourth ring gear.

The fifth unlocking device comprises a second flexible part 713, a second slider 712 and a third slider 711, the second flexible part 713 is connected with the second slider 712, the second slider 712 is provided with a first tooth, the third slider 711 is provided with a second tooth, the first tooth is provided with a second inclined surface inclined relative to the moving direction of the first tooth, the second tooth is provided with a third inclined surface inclined relative to the moving direction of the second tooth, the first tooth is meshed with the second tooth, the second inclined surface is in contact with the third inclined surface, the third slider 711 is arranged in the backrest joint 709 and is in contact with the second gear 708, the second flexible part 713 is pulled to drive the second slider 712 to move, and the second slider 712 drives the third slider 711 to move along the axial direction of the backrest joint 709 through the first tooth, so as to push the second gear 708 to leave the position where the third gear ring is meshed.

The fifth unlocking device further includes a sixth elastic member 714, and the sixth elastic member 714 abuts against the second slider 712 to reset the second slider 712 after moving the second slider.

The second flexible member 713 penetrates into the backrest rod 500, the folding button 501 is arranged at the top of the backrest rod 500, and the second flexible member 713 can be pulled by pressing the folding button 501, and then the second slider 712 is pulled, so that the locking between the backrest joint 709 and the second connecting joint 703 is released.

As shown in fig. 20, the stroller frame further includes a foot joint 715, the foot joint 715 is disposed inside the backrest joint 709, the foot joint 715 is provided with a third stopper 718, the backrest joint 709 is provided with a fourth stopper 719, and the third stopper 718 and the fourth stopper 719 are in contact with each other and are used to allow the foot joint 715 to move together with the backrest joint 709 when the backrest joint 709 moves backward.

The third stop block 718 is disposed at the outer edge of the pedal joint 715, the fourth stop block 719 is disposed at the outer edge of the backrest joint 709, and when the third stop block 718 and the fourth stop block 719 are in contact with each other, the pedal joint 715 cannot rotate backward relative to the backrest joint 709, so that the pedal joint 715 can rotate backward together with the backrest joint 709, and the pedal joint 715 and the backrest joint 709 can always keep an included angle of 180 degrees in the rotation process.

As shown in fig. 21 and 22, the stroller frame further includes an armrest joint 717, the armrest joint 717 is disposed inside the pedal joint 715, the armrest joint 717 is provided with a fifth stop 716, the pedal joint 715 is provided with a third through hole 721, the backrest joint 709 is provided with a second groove 720, the fifth stop 716 is inserted into the second groove 720 through the third through hole 721, and the armrest joint 717 is driven by the fifth stop 716 to fold toward the pedal joint 715 when the backrest joint 709 is folded with respect to the pedal joint 715. By providing the fifth stop block 716, the armrest joint 717 can be folded toward the footrest joint 715 together with the backrest joint 709, so that the backrest joint 709, the armrest joint 717, and the footrest joint 715 can be completely folded.

Therefore, when the seat mounting rack is folded, the folding button 501 can be pressed first, the second flexible part 713 is pulled, the second slider 712 is driven to move upwards, when the second slider 712 moves upwards, the third slider 711 is driven to move in the direction close to the second connecting joint 703 along the axial direction through the matching of the second inclined surface and the third inclined surface, so that the second gear 708 is driven 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; pushing the backrest joint 709 to fold toward the pedal joint 715; during the folding process of the backrest joint 709, the fifth stop block 716 can drive the armrest joints 717 to fold together towards the pedal joints 715; the ceiling joint 710 is rotatably installed on the back-rest lever 500, and the ceiling joint 710 can be folded during the folding of the seat mount, thereby achieving the complete folding of the seat mount.

Through the description of the plurality of embodiments of the baby carriage frame folding joint, the baby carriage frame and the baby carriage, the baby carriage frame folding joint, the baby carriage frame and the baby carriage in the embodiment of the invention can be seen to effectively improve the operation safety of the baby carriage during folding through a progressive unlocking mode, meanwhile, the seat can be installed in the positive direction and the negative direction, folding can be realized through forward installation and reverse installation, and the use convenience of the baby carriage is ensured.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims

1. A stroller frame folding joint (400), comprising:

a handle joint (403);

a rear foot joint (407) that is provided on the inner side of the handlebar joint (403), and that has a locked state in which the rear foot joint is fixed relative to the handlebar joint (403) and an unlocked state in which the rear foot joint is rotatable relative to the handlebar joint (403);

a first unlocking device for switching the rearfoot joint (407) to an unlocked state that is rotatable relative to the handlebar joint (403);

a forefoot joint (411) that is provided on the inner side of the rear foot joint (407) and that has a locked state in which the forefoot joint (407) is fixed relative to the rear foot joint and an unlocked state in which the forefoot joint (407) is rotatable; and

and the second unlocking device is arranged on the handlebar joint (403) and used for driving the front foot joint (411) to be switched to an unlocking state which can be rotated relative to the rear foot joint (407) when the handlebar joint (403) rotates relative to the rear foot joint (407) by a first preset angle.

2. The stroller frame folding joint (400) according to claim 1, further comprising a first locking device arranged between the handlebar joint (403) and the rear foot joint (407), wherein the first locking device is used for fixing the handlebar joint (403) and the rear foot joint (407) relatively, and the first unlocking device is used for driving the first locking device to move so as to enable the rear foot joint (407) to be switched to an unlocking state which can be rotated relative to the handlebar joint (403).

3. The stroller frame folding joint (400) according to claim 1, further comprising a second locking device disposed between the rear foot joint (407) and the front foot joint (411), the second locking device being used for fixing the rear foot joint (407) and the front foot joint (411) relatively, and the second unlocking device being used for driving the second locking device to move so as to enable the front foot joint (411) to be switched to an unlocking state which can be rotated relative to the rear foot joint (407).

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

5. The stroller frame folding joint (400) according to claim 3, wherein the second locking device comprises 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), and the first gear (409) is meshed with the first gear ring and the second gear ring simultaneously in a locking state that the front foot joint (411) and the rear foot joint (407) are relatively fixed; in an unlocked state in which the forefoot joint (411) is rotatable relative to the rearfoot joint (407), the first gear (409) leaves a position in which it meshes with the first gear ring or the first gear (409) leaves a position in which it meshes with the second gear ring.

6. The stroller frame folding joint (400) according to claim 5, wherein the second unlocking means comprises a first boss (418), the first boss (418) is arranged on the side surface of the handle joint (403) close to the rear foot joint (407), the top surface of the first boss (418) is inclined relative to the side surface, the rear foot joint (407) is provided with a first through hole, the first boss (418) passes through the first through hole, and the first boss (418) is used for pushing the first gear (409) to move away from the position of meshing with the second gear when the handle joint (403) rotates relative to the rear foot joint (407) by a first preset angle.

7. The stroller frame folding joint (400) according to claim 6, characterized in that the second locking device further comprises 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 stroller frame folding joint (400) according to claim 1, further comprising:

a first connection joint (414) which is arranged on the inner side of the front foot joint (411) and is used for connecting a seat, and has a locking state which is relatively fixed with the front foot joint (411) and an unlocking state which can rotate relative to the front foot joint (411); and

and the third unlocking device is arranged on the rear foot joint (407) and used for driving the first connecting joint (414) to be switched to an unlocking state which can be rotated relative to the front foot joint (411) when the rear foot joint (407) rotates relative to the front foot joint (411) by a second preset angle.

9. The stroller frame folding joint (400) according to claim 8, further comprising a third locking device disposed between the front foot joint (411) and the first connecting joint (414), wherein the third locking device is used for fixing the front foot joint (411) and the first connecting joint (414) relatively, and the third unlocking device is used for driving the third locking device to move so as to switch the first connecting joint (414) to an unlocking state which can rotate relative to the front foot joint (411).

10. The stroller frame folding joint (400) according to claim 9, wherein the third unlocking device comprises a second boss (416), the second boss (416) is disposed on a side surface 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, the second boss (416) passes through the second through hole, and the second boss (416) is used for pushing 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.

11. The stroller frame folding joint (400) according to claim 9, wherein said third locking means comprises:

a first groove (420) provided on the first coupling joint (414); and

a first bolt (413) movably connected with the front foot joint (411), wherein the first bolt (413) is inserted into the first groove (420) in a locking state that the front foot joint (411) and the first connecting joint (414) are relatively fixed; in an unlocked state in which the forefoot joint (411) is rotatable relative to the first coupling joint (414), the first latch (413) disengages from the first groove (420).

12. The stroller frame folding joint (400) according to claim 11, wherein the third unlocking device comprises a second boss (416), the second boss (416) is disposed on a side surface 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, the second boss (416) passes through the second through hole, and the second boss (416) is used for pushing the first bolt (413) to leave the first groove (420) when the rear foot joint (407) rotates relative to the front foot joint (411) by a second preset angle.

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

14. The stroller frame folding joint (400) according to claim 1, further comprising a first connecting joint (414), the first connection joint (414) is arranged on the inner side of the forefoot joint (411), is used for connecting a seat and has a locking state which is relatively fixed with the front foot joint (411) and an unlocking state which is rotatable relative to the front foot joint (411), a first stop block (415) is arranged on the first connecting joint (414), a second stop block (417) is arranged on the handle joint (403), the second block (417) extends through the hindfoot joint (407) and the forefoot joint (411) to the circumferential side of the first block (415), the second stopper (417) is used to rotate the first connection joint (414) to a preset position by pushing the first stopper (415) when the stroller frame is unfolded.

15. A stroller frame, comprising a stroller frame folding joint (400) according to any one of claims 1 to 14.

16. A stroller frame, characterized by comprising a second connection joint (703) and a stroller frame folding joint (400) according to any one of claims 8-14, wherein the second connection joint (703) is connected with the first connection joint (414), and the second connection joint (703) is used for installing a seat.

17. The stroller frame according to claim 16, characterized in that the first connection joint (414) comprises a socket and the second connection joint (703) comprises a plug which is inserted into the socket to enable the connection of the first connection joint (414) and the second connection joint (703).

18. The stroller frame of claim 17, wherein the socket is fore-aft symmetric about a vertical axis thereof and the plug is fore-aft symmetric about a vertical axis thereof.

19. The stroller frame of claim 17, further comprising a fourth locking device disposed between the plug and the socket for relatively securing the plug and the socket, and a fourth unlocking device for actuating movement of the fourth locking device to enable relative movement of the plug and the socket.

20. The stroller frame according to claim 19, wherein the fourth locking device comprises a first slider (704) and a bayonet (705) arranged on the plug, the first slider (704) is provided with a long hole obliquely arranged relative to the relative movement direction of the plug and the socket, the bayonet (705) is inserted into the long hole and moves in the long hole, a locking notch is arranged in the socket, the plug and the socket are relatively fixed when the bayonet (705) is inserted into the locking notch, and the fourth unlocking device is used for driving the first slider (704) to move so as to drive the bayonet (705) to be disengaged from the locking notch.

21. The stroller frame according to claim 16, further comprising a backrest joint (709), a fifth locking device and a fifth unlocking device, wherein the backrest joint (709) is arranged 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 used for fixing the backrest joint (709) and the second connecting joint (703) relatively, and the fifth unlocking device is used for driving the fifth locking device to move so as to enable the backrest joint (709) and the second connecting joint (703) to move relatively.

22. The stroller frame according to claim 21, characterized in that the fifth locking means comprises a second gear wheel (708), a third gear ring arranged on the backrest joint (709) and a fourth gear ring arranged on the second connection joint (703), the second gear wheel (708) meshing simultaneously with the third gear ring and the fourth gear ring in a locked state in which the backrest joint (709) and the second connection joint (703) are relatively fixed; in an unlocked state in which the backrest joint (709) is rotatable relative to the second connection joint (703), the second gear (708) is moved out of the position in which it meshes with the third gear ring or the second gear (708) is moved out of the position in which it meshes with the fourth gear ring.

23. The stroller frame according to claim 22, characterized in that the fifth unlocking means comprises a second flexible member (713), a second slider (712) and a third slider (711), the second flexible member (713) being connected to the second slider (712), the second slider (712) being provided with a first tooth, the third slider (711) being provided with a second tooth having a second slope inclined with respect to the direction of movement of the first tooth, the second tooth having a third slope inclined with respect to the direction of movement of the second tooth, the first tooth being in mesh with the second tooth, the second slope being in contact with the third slope, the third slider (711) being arranged in the backrest knuckle (709) and being in contact with the second gear (708), the second flexible member (713) moving the second slider (712) when pulled, the second sliding block (712) drives the third sliding block (711) to move along the axial direction of the backrest joint (709) through the first tooth, and then pushes the second gear (708) to leave the position meshed with the third gear ring.

24. The stroller frame according to claim 21, further comprising a foot joint (715), wherein the foot joint (715) is arranged inside the backrest joint (709), the foot joint (715) is provided with a third stop (718), the backrest joint (709) is provided with a fourth stop (719), and the third stop (718) and the fourth stop (719) are in contact with each other and are adapted to move the foot joint (715) with the backrest joint (709) when the backrest joint (709) moves backwards.

25. The stroller frame according to claim 24, further comprising an armrest joint (717), wherein the armrest joint (717) is disposed inside the pedal joint (715), the armrest joint (717) is provided with a fifth stop (716), the pedal joint (715) is provided with a third through hole (721), the backrest joint (709) is provided with a second groove (720), the fifth stop (716) is inserted into the second groove (720) through the third through hole (721), and the backrest joint (709) is folded relative to the pedal joint (715) to drive the armrest joint (717) to fold toward the pedal joint (715) through the fifth stop (716).

26. A stroller comprising a stroller frame according to any one of claims 15 to 25.