CN110588758B

CN110588758B - Infant's frame

Info

Publication number: CN110588758B
Application number: CN201910992523.1A
Authority: CN
Inventors: 杨钧卿
Original assignee: B & B Best Industrial Co ltd
Current assignee: B & B Best Industrial Co ltd
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2025-01-07
Anticipated expiration: 2039-10-18
Also published as: CN110588758A

Abstract

The present invention discloses an infant stroller frame, wherein the lower end of a push rod is connected to the upper end of a front foot rod by a joint, a handlebar rod is connected to the push rod, and a rear foot rod is connected to a sliding member, a front linkage rod is hinged between the sliding member and the front foot rod, and a rear linkage rod is hinged between the sliding member and the rear foot rod, a first locking control assembly is provided on the handlebar rod and the push rod, and a second locking control assembly is provided between the rear foot rod and the sliding member. When folding, the first locking control assembly is first acted on to retract the handlebar rod relative to the push rod, and when the lower end of the handlebar rod presses against the trigger joint, the joint is unlocked. At this time, the user pulls up the second locking control assembly again, the sliding member is unlocked, and under the action of gravity and the front linkage rod and the rear linkage rod, the front foot rod and the push rod are completely close to the rear foot rod. After folding is completed, the entire frame is in an upright state, and the user can operate it by one person with one hand. The frame is unlocked safely and orderly, and the problem of pinching caused by misoperation is avoided.

Description

Infant's frame

[ Field of technology ]

The invention relates to the field of baby carriages, in particular to an infant carriage frame.

[ Background Art ]

The existing infant carriage is provided with a folding structure in order to facilitate parents to fold the infant carriage conveniently when the parents take the infant to travel, the folding structure is various in design, the locking mechanism of the infant carriage can be folded generally, the unlocking and folding steps are complicated, and the hidden danger of unreliable locking exists.

In addition, when the frame of the common infant car is unfolded and used, the distance between the two front wheels is smaller than the distance between the two rear wheels, and the distance between the two front wheels and the distance between the two rear wheels are unchanged before and after folding, so that the whole car frame is folded, the two rear wheels are arranged on the outer sides of the two front wheels, and still occupy a larger space after folding, and the infant car frame is inconvenient to carry out.

Moreover, the existing foldable infant carriage needs two hands to cooperate to fold, and when a user holds a child with one hand, the infant carriage cannot be folded by one person, so that the infant carriage has the defect of inconvenience for some users.

The invention is researched and proposed to overcome the defects of the prior art.

[ Invention ]

The invention aims to solve the technical problem of providing an infant frame, which comprises a front foot rod, a rear foot rod, a push rod and a handle rod, wherein the lower end of the push rod is connected with the upper end of the front foot rod through a joint, the handle rod is telescopically connected to the push rod, a sliding piece is slidably connected to the rear foot rod, a rear linkage rod is hinged between the sliding piece and the rear foot rod, a first locking control assembly for controlling the telescopic motion of the handle rod relative to the push rod is arranged on the handle rod and the push rod, a second locking control assembly is arranged between the rear foot rod and the sliding piece, when the infant frame is folded, the first locking control assembly is firstly acted on to enable the handle rod to retract relative to the push rod, and when the lower end of the handle rod is pushed against a trigger joint, the joint is unlocked, at the moment, a user lifts the second locking control assembly upwards, the sliding piece is downwards folded towards the rear foot rod under the action of gravity, the sliding piece slides towards the lower end of the rear foot rod, pulls the front foot rod and the rear linkage rod, enables the front foot rod and the push rod to be completely close to the rear foot rod, and finally the handle rod is in a state of being folded, the infant frame is in a single-joint state, and the infant frame is locked by a single person, and the infant frame is prevented from being locked by the first locking control assembly and the joint.

In order to solve the technical problems, the invention provides an infant carriage, comprising:

the front foot rod, the front foot rod lower extreme is equipped with the front wheel subassembly.

The rear foot rod, the rear foot rod lower extreme is equipped with the rear wheel subassembly.

The push rod, be equipped with the joint that can rotate relatively between push rod lower extreme and the forefoot pole upper end.

The sliding piece is connected to the rear foot rod and can slide relative to the rear foot rod.

The lower end of the rear linkage rod is connected with the sliding part through a universal hinge structure, the upper end of the rear linkage rod is directly or indirectly connected with the push rod through a universal hinge structure, or the upper end of the rear linkage rod is directly or indirectly connected with the push rod through at least a secondary rotatable hinge structure.

The upper part of the push rod is connected with a handle rod in a telescopic way, and a first locking control assembly for controlling the handle rod to stretch and retract relative to the push rod and then unlocking a joint is arranged between the handle rod and the push rod.

And a second locking control assembly for locking the sliding piece on the rear foot rod when the frame is unfolded is arranged between the rear foot rod and the sliding piece.

According to the infant frame, the front linkage rod is hinged to the sliding piece, and the front end of the front linkage rod is directly or indirectly hinged to the front foot rod.

According to the infant frame, the first cross rod is arranged between the two front foot rods, and the front linkage rod is indirectly hinged with the front foot rods through the first cross rod.

According to the infant frame, the second cross rod is arranged between the two joints, and the upper ends of the rear foot rods are hinged with the second cross rod or the seat board.

The infant frame is characterized in that the second cross rod is provided with the hinge seat, the hinge seat is provided with the hinge shaft hole, and the upper end of the rear foot rod is rotatably connected with the corresponding hinge shaft hole.

In the infant carrier according to the above aspect, the included angle between the axes of the two hinge shaft holes 202 is α,180 ° > α >90 °, and the included angle between the axis of the hinge shaft hole 202 and the axis of the second cross bar 200 is β, β <90 °.

The infant frame comprises the first locking control assembly and the second locking control assembly, wherein the first locking control assembly comprises a handle switch assembly arranged on a handle rod and a handle rod locking assembly arranged between the end of the handle rod and a push rod, and a linkage piece is arranged between the handle switch assembly and the handle rod locking assembly.

The infant carriage comprises the handle arranged on the handle rod in a rotatable mode and the driving block arranged in the handle rod in an axially sliding mode, the driving block is provided with the driving chute, the inner side of the handle is provided with the bayonet lock extending into the driving chute to act on the driving block to slide along the handle rod, and the driving block is connected with the linkage piece.

The handle bar locking assembly comprises a sliding block, a triggering block, a lock tongue and an elastic resetting piece, wherein the sliding block is slidably arranged on the triggering block, two ends of the elastic resetting piece are respectively abutted against the sliding block and the triggering block, the lower end of the linkage piece is connected with the sliding block, a guide chute is arranged on the sliding block, a telescopic control groove radially arranged along the handle bar is arranged on the triggering block, the lock tongue penetrates through the guide chute and the telescopic control groove through a pin shaft and is connected onto the triggering block, the handle bar locking assembly further comprises a lock hole which is arranged on a push rod and is matched with the lock tongue, and when the linkage piece pulls the sliding block, the free end of the lock tongue withdraws from the lock hole, so that the handle bar can slide in a telescopic manner relative to the push rod.

The infant frame comprises an upper joint block connected with the lower end of a push rod and a lower joint block connected with the upper end of a front foot rod, wherein a locking clamping groove is formed between the upper joint block and the lower joint block, the infant frame further comprises a joint locking clamping block and a joint locking reset piece, the joint locking clamping block is movably embedded in the locking clamping groove, the joint locking reset piece is arranged between the joint locking clamping block and the upper joint block or the lower joint block, a joint unlocking guide inclined plane is arranged on one side surface of the joint locking clamping block, which is opposite to the joint locking reset piece, correspondingly, when the lower end of the handle rod directly or indirectly contacts with the joint unlocking guide inclined plane, the joint locking clamping block is separated from the locking clamping groove on the upper joint block or the lower joint block, and then the lower joint block can rotate relative to the upper joint block.

The infant frame is characterized in that the joint further comprises a wedge block, the wedge block is provided with a wedge surface matched with the joint unlocking guide inclined surface, when the lower end of the handle rod is abutted against the upper end of the wedge block to enable the wedge surface to press the joint unlocking guide inclined surface, the joint locking clamping block is separated from the locking clamping groove on the upper joint block or the lower joint block, and the lower joint block can rotate relative to the upper joint block.

The second locking control assembly comprises a clamping hook, a locking hook and a locking hook resetting piece, wherein the clamping hook is arranged on the sliding piece, the middle part of the locking hook is hinged to the upper part of the rear foot rod, the locking hook resetting piece is arranged between one end of the locking hook and the rear foot rod, the locking hook is enabled to be buckled on the clamping hook by elastically jacking the locking hook, and the locking hook is connected with an unlocking pull rope/belt used for pulling the locking hook to enable the locking hook to be separated from the clamping hook.

The infant frame is characterized in that the universal hinge structure is a spherical hinge structure, the secondary rotatable hinge structure comprises a first steering joint and a second steering joint, the first steering joint is directly or indirectly pivoted with the push rod, one end of the second steering joint is pivoted on the first steering joint, and the other end of the second steering joint is relatively fixed and connected with the rear linkage rod.

The invention also provides another infant carriage, which is characterized by comprising:

The lower end of the rear linkage rod is connected with the sliding part through a universal hinge structure, the upper end of the rear linkage rod is directly or indirectly connected with the push rod through a universal hinge structure, or the upper end of the rear linkage rod is directly or indirectly connected with the push rod through at least a secondary hinge structure.

The push rod is provided with a first locking control component for controlling the unlocking of the joint.

Compared with the prior art, the infant carriage has the following advantages:

1. The novel baby carriage is characterized in that a first locking control assembly, a joint and a second locking control assembly are respectively arranged between the handle bar and the push rod and between the push rod and the front foot bar and between the sliding piece and the rear foot bar, the whole carriage is provided with three locking and unlocking mechanisms, so that the carriage is unlocked safely and orderly, and the phenomenon that the baby carriage is folded due to unlocking caused by misoperation under the condition that a baby is arranged on a carriage seat part is avoided.

2. When the folding device is folded, a user can firstly act on the first locking control component by one hand to release the locking state of the handle bar, then the lower end of the handle bar can trigger the joint to unlock, the push rod is turned backwards and downwards under the action of gravity, at the moment, the user lifts the second locking control component, under the action of gravity and the front linkage rod and the rear linkage rod, the front foot rod and the push rod are close to be clung to the rear foot rod, and after the folding device is completely folded, the whole frame is in an upright state and has the characteristic of convenient folding.

3. The upper ends of the rear foot rods are connected through the hinge shaft holes of the hinge seat, and the hinge shaft holes are obliquely arranged relative to the second cross rod, so that the rear wheel assemblies of the two rear foot rods are positioned on the inner sides of the two front wheel assemblies after being folded, and when the frame of the bicycle is unfolded, the distance between the two rear wheel assemblies is larger than the distance between the two front wheel assemblies.

4. A plurality of lock holes are formed in the push rod, and the telescopic length of the handle rod can be adjusted by acting on the first locking control assembly so as to adjust the comfort level of a user.

5. The first cross rod is fixedly connected between the two front foot rods, the second cross rod is fixedly connected between the two joints, and the whole frame is connected more reliably and stably through the connection of the first cross rod and the second cross rod.

6. The two ends of the rear linkage rod are connected with the push rod and the sliding piece through universal hinge structures, or the upper ends of the rear linkage rod are connected with the push rod through at least two-stage rotatable hinge structures, so that the rear foot rod can be folded inwards smoothly in the folding process, and interference is avoided.

[ Description of the drawings ]

The invention is described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a side view of the present invention;

FIG. 2 is a schematic perspective view of the present invention;

FIG. 3 is a second perspective view of the present invention;

FIG. 4 is an exploded view of the handle bar locking assembly and push rod and handle bar attachment structure of the present invention;

FIG. 5 is an exploded view of the handle bar lock assembly of the present invention;

FIG. 6 is an exploded view of the handle switch assembly of the present invention;

FIG. 7 is an exploded view of the joint of the present invention;

FIG. 8 is an enlarged view of the mark A of FIG. 3 in accordance with the present invention;

FIG. 9 is a schematic view of the connection of the second cross bar to the hinge base in the present invention;

FIG. 10 is an exploded view of a second lock control assembly of the present invention;

FIG. 11 is a schematic view of the structure of the rear linkage rod of the present invention connected to the sliding member and the push rod, respectively;

FIG. 12 is a reference view of the folded state of the present invention;

fig. 13 is a side view of an embodiment of the present invention omitting the front linkage.

[ Detailed description ] of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 13, the infant carrier of the present invention includes a front foot bar 1, a rear foot bar 2, a push bar 3, a handle bar 31, a slider 5, and a rear link bar 7. The lower end of the front foot rod 1 is provided with a front wheel assembly, and the lower end of the rear foot rod 2 is provided with a rear wheel assembly.

A joint 4 capable of rotating relatively is arranged between the lower end of the push rod 3 and the upper end of the front foot rod 1, the joint 4 can automatically lock the push rod 2 and the front foot rod 1 relatively when the frame is unfolded, and when the lower end of the handle rod is pressed against the joint 4, the joint 4 is forced to unlock, so that the push rod can be folded backwards relative to the front foot rod.

The sliding piece 5 is connected to the rear foot rod 2 and can slide relative to the rear foot rod 2, a sliding groove 21 is formed in the rear foot rod, a guide block arranged in the sliding groove is arranged in the sliding piece, and a second locking control assembly 9 for locking the sliding piece 5 on the rear foot rod 2 when the frame is unfolded is arranged between the rear foot rod 2 and the sliding piece 5. When the bicycle is unfolded, the sliding piece is locked on the upper part of the rear foot rod through the second locking control assembly.

The rear linkage rod 7, the lower extreme of rear linkage rod 7 is connected through universal hinge structure with slider 5, the upper end of rear linkage rod 7 is directly or indirectly with be connected through universal hinge structure between the push rod 3, perhaps the upper end of rear linkage rod 7 is directly or indirectly with be connected through at least two-stage rotatable hinge structure between the push rod 3. As shown in fig. 11, in the embodiment of the present invention, the universal hinge structure is a spherical hinge structure, the two-stage rotatable hinge structure includes a first steering joint 71 and a second steering joint 72, the first steering joint 71 is directly or indirectly pivoted with the push rod 3, one end of the second steering joint 72 is pivoted on the first steering joint 71, and the other end of the second steering joint 72 is relatively fixed and connected with the rear linkage rod 7, so that the rear linkage rod 7 has two rotational degrees of freedom in different directions relative to the push rod 3, and when folding, the lower ends of the two rear foot rods 2 do not interfere when folding inwards of the two front foot rods, which ensures smooth folding, compact folding, and minimized volume.

When the second locking control assembly is acted to enable the sliding piece to be unlocked, the push rod is folded downwards and backwards under the action of gravity, and the sliding piece is acted by the rear linkage rod, so that the sliding piece slides along the rear end of the rear foot rod.

The upper part of the push rod 3 is connected with a handle rod 31 in a telescopic way, a first locking control assembly 8 for controlling the handle rod 31 to stretch out and draw back relative to the push rod 3 and unlocking the joint 4 after the handle rod 31 contracts is arranged between the handle rod 31 and the push rod 3, and the stretching length of the handle rod 31 relative to the push rod can be adjusted through the first locking control assembly 8 so as to adapt to the use height and the use length of a user.

As shown in fig. 1-3, in order to facilitate the folding and unfolding of the frame, the sliding piece 5 is hinged with a front linkage rod 6, and the other end of the front linkage rod 6 is directly or indirectly hinged with the front foot rod 1. When folding, the sliding piece slides downwards, and pulls the front foot rod to draw close towards the rear foot rod through the front linkage rod.

In order to strengthen the connection, a first cross bar 100 is arranged between the two front foot bars 2, and the front end of the front linkage bar 6 is hinged on the first cross bar 100, so that the hinge point of the front linkage bar 6 and the first cross bar is positioned between the inner sides of the two front foot bars.

Similarly, as shown in fig. 9, a second cross bar 200 is provided between the two joints 4, and the upper end of the rear foot bar 2 is hinged to the second cross bar 200 or the seat board. The second cross bar 200 is provided with a hinge seat 201, the hinge seat 201 is provided with a hinge shaft hole 202, and the upper end of the rear foot bar 2 is rotatably connected with the corresponding hinge shaft hole 202. As shown in fig. 9, the included angle between the axes of the two hinge shaft holes 202 is α,180 ° > α >90 °, and the included angle between the axis of the hinge shaft hole 202 and the axis of the second cross bar 200 is β, β <90 °. Because the hinge shaft hole is obliquely arranged relative to the second cross rod, the rear wheel assemblies of the two rear foot rods are positioned at the inner sides of the two front wheel assemblies after being folded, and when the frame of the bicycle is unfolded, the distance between the two rear wheel assemblies is larger than the distance between the two front wheel assemblies.

As shown in fig. 4 to 6, the first locking control assembly 8 includes a handle switch assembly 81 provided on the handle bar and a handle bar locking assembly 82 provided between the end of the handle bar and the push rod, and a link 83 is provided between the handle switch assembly 81 and the handle bar locking assembly 82.

As shown in fig. 6, the handle switch assembly 81 includes a handle 811 rotatably provided on the handle bar 31 and a driving block 812 axially slidably provided in the handle bar 31, a driving chute 813 is provided on the driving block 812, a bayonet 814 extending into the driving chute 83 to allow the driving block 812 to slide along the handle bar 31 is provided on the inner side of the handle 811, and the driving block 812 is connected with the linkage 83. When the movable sliding type sliding mechanism is used, the handle is correspondingly rotated, and the clamping pin acts on the driving block on the driving chute, so that the two driving blocks slide in opposite directions, and the linkage piece can be pulled.

As shown in fig. 4, the handle bar locking assembly 82 includes a sliding block 821, a trigger block 822, a lock tongue 823 and an elastic reset member 824, the sliding block 821 is slidably disposed on the trigger block 822, two ends of the elastic reset member 824 respectively abut against the sliding block 821 and the trigger block 822, the lower end of the linkage member 83 is connected with the sliding block 821, a guiding chute 825 is disposed on the sliding block 821, a telescopic control groove 826 radially disposed along the handle bar 31 is disposed on the trigger block 822, the lock tongue 823 penetrates through the guiding chute 825 and the telescopic control groove 826 through a pin shaft and is connected to the trigger block 821, the handle bar locking assembly 82 further includes a lock hole 827 disposed on the push rod and used for being matched with the lock tongue 823, the lock hole 827 can be designed in plurality, and when the linkage member 83 pulls the sliding block 821, the free end of the lock tongue 823 exits the lock hole 827, so that the handle bar can slide telescopically relative to the push rod. When the linkage piece is pulled, the lower end of the linkage piece overcomes the elastic reset piece to pull the sliding block to move, and the pin shaft on the lock tongue is matched with the guide chute 825 and the telescopic control groove 826 to enable the lock tongue to retract out of the lock hole, so that the telescopic length of the handle rod can be adjusted, and the handle rod can be unlocked to enable the lower end to push against the joint to unlock.

As shown in fig. 7, the joint 4 includes an upper joint block 41 connected to the lower end of the push rod, and a lower joint block 42 connected to the upper end of the front foot rod, a locking slot 43 is provided between the upper joint block 41 and the lower joint block 42, the joint 4 further includes a joint locking block 44 and a joint locking reset member 45, the joint locking block 44 is movably embedded in the locking slot 43, the joint locking reset member 45 is disposed between the joint locking block 44 and the upper joint block 41 or the lower joint block 42, correspondingly, a joint unlocking guiding inclined plane 46 is provided on a side of the joint locking block 44 facing away from the joint locking reset member 45, when the lower end of the handle rod directly or indirectly abuts against the joint unlocking guiding inclined plane 46, the joint locking block 44 is separated from the locking slot 43 on the upper joint block 41 or the lower joint block 42, and the lower joint block 42 can rotate relative to the upper joint block 41.

In the present invention, the joint 4 further includes a wedge 47, the wedge 47 has a wedge surface 471 that cooperates with the joint unlocking guiding inclined plane 46, when the lower end of the handle bar abuts against the upper end of the wedge 47 so that the wedge surface 471 presses the joint unlocking guiding inclined plane 46, the joint locking fixture 44 is separated from the locking fixture groove 43 on the upper joint block 41 or the lower joint block 42, and the upper joint block 41 can rotate relative to the lower joint block 42.

As shown in fig. 8 and 10, the second locking control assembly 9 includes a hook 91, a hook 92, and a hook reset member 93, where the hook 91 is disposed on the sliding member 5, the middle of the hook 92 is hinged to the upper portion of the rear leg, the hook reset member 93 is disposed between one end of the hook 92 and the rear leg to elastically push the hook 92 so that the hook 92 is snapped onto the hook 91, and the hook 92 is connected with an unlocking pull rope/belt 94 for pulling the hook 92 to disengage the hook 92 from the hook 91.

When the invention is folded, the handle of the first locking control assembly is correspondingly rotated, the driving block slides relative to the handle rod to pull the linkage piece, the lower end of the linkage piece pulls the sliding block, the sliding block enables the lock tongue to retract out of the lock hole, at the moment, the handle rod can retract and adjust relative to the push rod, when the trigger block at the lower end of the handle rod pushes against the trigger pushing wedge-shaped block, the wedge-shaped surface pushes against the joint unlocking guide inclined plane, so that the joint locking clamping block 44 is separated from the locking clamping groove 43 on the upper joint block 41 or the lower joint block 42, and the lower joint block 42 can rotate relative to the upper joint block 41. After that, the user pulls up the unlocking pull rope/belt 94 again to disengage the latch hook 92 from the latch hook 91, the sliding piece is unlocked, under the action of gravity, the push rod is turned down to be close to the rear foot rod, the sliding piece slides towards the lower end of the rear foot rod, and pulls the front linkage rod and the rear linkage rod, so that the front foot rod and the push rod are completely close to the rear foot rod, and finally after the folding is completed, the whole frame is in an upright state, the user can operate by a single person and can perform three locking and unlocking structures of the joint, the first locking control component and the second locking control component are adopted, the frame is unlocked safely and orderly, and the problem of clamping injury caused by misoperation is avoided.

The infant frame comprises a front foot rod 1, a rear foot rod 2, a push rod 3, a sliding piece 5 and a rear linkage rod 7, wherein a front wheel assembly is arranged at the lower end of the front foot rod 1, a rear wheel assembly is arranged at the lower end of the rear foot rod 2, a joint 4 capable of rotating relatively is arranged between the lower end of the push rod 3 and the upper end of the front foot rod 1, and the joint 4 can adopt a joint structure disclosed in China patent 2016211829323.

The sliding piece 5 is connected to the rear foot rod 2 and can slide relative to the rear foot rod 2, the lower end of the rear linkage rod 7 is connected with the sliding piece 5 through a universal hinge structure, the upper end of the rear linkage rod 7 is directly or indirectly connected with the push rod 3 through a universal hinge structure, such as a spherical hinge structure, or the upper end of the rear linkage rod 7 is directly or indirectly connected with the push rod 3 through at least a secondary hinge structure, as shown in fig. 11.

According to the requirement, the telescopic structure of the push rod design in this embodiment is also possible, the push rod 3 is provided with a first locking control assembly 8 for controlling the unlocking of the joint 4, for this first locking control assembly 8, an unlocking assembly disclosed in chinese patent 2016211829323 can be adopted, a second locking control assembly 9 for locking the sliding member 5 on the rear foot rod 2 when the frame is unfolded is arranged between the rear foot rod 2 and the sliding member 5, and the second locking control assembly 9 is shown in fig. 10.

Claims

1. An infant carrier characterized by comprising:

a front foot rod (1), wherein the lower end of the front foot rod (1) is provided with a front wheel assembly;

the rear foot rod (2), the lower end of the rear foot rod (2) is provided with a rear wheel assembly;

The push rod (3), there is a joint (4) that can rotate relatively between upper end of the front foot bar (1) and the lower end of the said push rod (3);

the sliding piece (5) is connected to the rear foot rod (2) and can slide relative to the rear foot rod (2);

The lower end of the rear linkage rod (7) is connected with the sliding piece (5) through a universal hinge structure, the upper end of the rear linkage rod (7) is directly or indirectly connected with the push rod (3) through a universal hinge structure, or the upper end of the rear linkage rod (7) is directly or indirectly connected with the push rod (3) through at least a secondary rotatable hinge structure;

The upper part of the push rod (3) is connected with a handle rod (31) in a telescopic way, and a first locking control assembly (8) for controlling the handle rod (31) to stretch and retract relative to the push rod (3) and the joint (4) to unlock after the handle rod (31) contracts is arranged between the handle rod (31) and the push rod (3);

A second locking control assembly (9) for locking the sliding piece (5) on the rear foot rod (2) when the frame is unfolded is arranged between the rear foot rod (2) and the sliding piece (5);

a front linkage rod (6) is hinged on the sliding piece (5), and the front end of the front linkage rod (6) is directly or indirectly hinged with the front foot rod (1);

The universal hinge structure is a spherical hinge structure, the secondary rotatable hinge structure comprises a first steering joint (71) and a second steering joint (72), the first steering joint (71) is directly or indirectly pivoted with the push rod (3), one end of the second steering joint (72) is pivoted on the first steering joint (71), and the other end of the second steering joint (72) is relatively fixed and connected with the rear linkage rod (7);

A second cross rod (200) is arranged between the two joints (4) or between the two front foot rods (1), and the upper end of the rear foot rod (2) is hinged with the second cross rod (200);

The hinge seat (201) is arranged on the second cross rod (200), the hinge seat (201) is provided with a hinge shaft hole (202), the upper ends of the rear foot rods (2) are rotatably connected with the corresponding hinge shaft holes (202), the included angle between the axes of the two hinge shaft holes (202) is alpha, 180 degrees and alpha >90 degrees, and the included angle between the axes of the hinge shaft holes (202) and the axis of the second cross rod (200) is beta, and beta is smaller than 90 degrees.

2. An infant carriage according to claim 1, characterized in that a first cross bar (100) is arranged between the two front foot bars (2), the front linkage bar (6) being indirectly hinged to the front foot bars (1) via the first cross bar (100).

3. An infant carrier according to claim 1, characterized in that the first locking control assembly (8) comprises a handle switch assembly (81) provided on the handle bar and a handle bar locking assembly (82) provided between the end of the handle bar and the push rod, a linkage (83) being provided between the handle switch assembly (81) and the handle bar locking assembly (82).

4. An infant carrier according to claim 3, characterized in that the handle switch assembly (81) comprises a handle (811) rotatably arranged on the handle bar (31) and a drive block (812) axially slidably arranged in the handle bar (31), the drive block (812) being provided with a drive chute (813), the inside of the handle (811) being provided with a bayonet (814) extending into the drive chute (83) for sliding the drive block (812) along the handle bar (31), the drive block (812) being connected with a linkage (83);

Handle bar locking component (82) include slider (821), trigger piece (822), spring bolt (823) and elasticity piece that resets (824), slider (821) slidable ground sets up on trigger piece (822), elasticity piece (824) both ends are contradicted respectively in slider (821) and trigger piece (822), linkage piece (83) lower extreme is connected with slider (821), be provided with direction chute (825) on slider (821), be equipped with on trigger piece (822) along the radial flexible control groove (826) that set up of handle bar (31), spring bolt (823) run through in direction chute (825) and flexible control groove (826) and are connected on trigger piece (821) through the round pin axle, handle bar locking component (82) still including set up on the push rod be used for with spring bolt (823) complex lockhole (827), when linkage piece (83) pulling slider (821), spring bolt (823) free end then withdraws from lockhole (827) for handle bar telescopic slip relatively.

5. The infant car frame according to claim 1, wherein the joint (4) comprises an upper joint block (41) connected with the lower end of the push rod and a lower joint block (42) connected with the upper end of the front foot rod, a locking clamping groove (43) is formed between the upper joint block (41) and the lower joint block (42), the joint (4) further comprises a joint locking clamping block (44) and a joint locking reset piece (45), the joint locking clamping block (44) is movably embedded in the locking clamping groove (43), the joint locking reset piece (45) is arranged between the joint locking clamping block (44) and the upper joint block (41) or the lower joint block (42), accordingly, a joint unlocking guide inclined surface (46) is formed on one side surface of the joint locking clamping block (44) away from the joint locking reset piece (41) and can enable the joint locking clamping block (44) to be separated from the locking clamping groove (43) on the upper joint block (41) or the lower joint block (42) when the lower end of the handle rod directly or indirectly abuts against the joint unlocking guide inclined surface (46), and the lower joint block (42) can rotate relatively.

6. The infant car frame according to claim 5, wherein the joint (4) further comprises a wedge block (47), the wedge block (47) is provided with a wedge surface (471) matched with the joint unlocking guide inclined surface (46), and when the lower end of the handle bar is abutted against the upper end of the wedge block (47) to enable the wedge surface (471) to press the joint unlocking guide inclined surface (46), the joint locking clamping block (44) can be separated from the locking clamping groove (43) on the upper joint block (41) or the lower joint block (42), and the upper joint block (41) can rotate relative to the lower joint block (42).

7. The infant carrier according to any one of claims 1-6, wherein the second locking control assembly (9) comprises a hook (91), a hook (92) and a hook reset member (93), the hook (91) is arranged on the sliding member (5), the middle part of the hook (92) is hinged to the upper part of the rear foot rod, the hook reset member (93) is arranged between one end of the hook (92) and the rear foot rod to elastically push the hook (92) so that the hook (92) is buckled on the hook (91), and the hook (92) is connected with an unlocking pull rope/belt (94) for pulling the hook (92) so that the hook (92) is separated from the hook (91).

8. An infant carrier characterized by comprising:

The push rod (3) is provided with a first locking control component (8) for controlling the unlocking of the joint (4);