Infant stroller frame

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

[Technical field]

[0001] The invention relates to the field of baby carriages, in particular to a baby carriage frame. [Background technology]

[0002] Existing infant stroller frames usually have a folding structure to facilitate parents to fold the stroller when taking their infants out, and the folding mechanism has various design structures. Generally, the locking mechanism of a foldable infant stroller is relatively complex, and the unlocking and folding steps are cumbersome, and there is a safety hazard of unreliable locking.

[0003] In addition, when the frame of a conventional baby stroller is unfolded for use, 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 between the two rear wheels remains unchanged before and after being folded, so that after the entire frame is folded, the two rear wheels are placed outside the two front wheels, and the stroller still occupies a large space after being folded, making it inconvenient to carry outside.

[0004] Furthermore, the existing foldable infant stroller frame requires two hands to operate when folding. When the user holds the child in one hand, it is impossible to fold the stroller by one person. Therefore, it is inconvenient for some users.

[0005] The present invention is proposed in view of the deficiencies in the prior art. [Summary of the invention]

[0006] The technical problem to be solved by the present invention is to provide an infant stroller frame, comprising a front foot rod, a rear foot rod, a push rod and a handle rod, the lower end of the push rod is connected to the upper end of the front foot rod by a joint, the handle rod is telescopically connected to the push rod, the rear foot rod is slidably connected to a sliding member, a rear linkage rod is hinged between the sliding member and the rear foot rod, a first locking control component for controlling the extension and retraction of the handle rod relative to the push rod is provided on the handle rod and the push rod, a second locking control component is provided between the rear foot rod and the sliding member, when folding, the first locking control component is first acted on to retract the handle rod relative to the push rod, and when the lower end of the handle rod is folded, the first locking control component is acted on to retract the handle rod relative to the push rod, and when the lower end of the handle rod is folded, the first locking control component is acted on to retract the handle rod relative to the push rod. The joint is triggered by top pressure and unlocked. At this time, the user pulls up the second locking control component again, the sliding part is unlocked, and under the action of gravity, the push rod is folded downward and moved closer to the rear foot rod. The sliding part slides toward the lower end of the rear foot rod and pulls the front connecting rod and the rear connecting rod, so that the front foot rod and the push rod are completely close to the rear foot rod. After the folding is finally completed, the whole frame is in an upright state, and the user can operate it with one hand. The three locking and unlocking structures of the joint, the first locking control component and the second locking control component are adopted, so that the frame can be unlocked safely and orderly, avoiding the problem of pinching caused by misoperation.

[0007] In order to solve the above technical problems, the present invention provides an infant bicycle frame, comprising:

[0008] A front foot rod, wherein a front wheel assembly is arranged at the lower end of the front foot rod.

[0009] A rear foot rod, wherein a rear wheel assembly is arranged at the lower end of the rear foot rod.

[0010] A push rod is provided with a relatively rotatable joint between the lower end of the push rod and the upper end of the front foot rod.

[0011] A sliding member is connected to the rear foot rod and can slide relative to the rear foot rod.

[0012] A rear linkage rod, wherein the lower end of the rear linkage rod is connected to the sliding member via a universal hinge structure, the upper end of the rear linkage rod is directly or indirectly connected to the push rod via a universal hinge structure, or the upper end of the rear linkage rod is directly or indirectly connected to the push rod via at least two levels of rotatable hinge structures.

[0013] The upper part of the push rod is telescopically connected to a handle rod, and a first locking control component for controlling the extension and retraction of the handle rod relative to the push rod and unlocking the joint after the handle rod is contracted is provided between the handle rod and the push rod.

[0014] A second locking control assembly is provided between the rear foot rod and the sliding member for locking the sliding member on the rear foot rod when the frame is unfolded.

[0015] In the above-mentioned infant stroller frame, a front linkage rod is hinged on the sliding member, and the front end of the front linkage rod is directly or indirectly hinged to the front foot rod.

[0016] In the above-mentioned infant stroller frame, a first cross bar is provided between the two front foot bars, and the front connecting rod is indirectly hinged to the front foot bars through the first cross bar.

[0017] In the above-mentioned infant stroller frame, a second crossbar is provided between the two joints, and the upper end of the rear foot rod is hinged to the second crossbar or the seat plate.

[0018] In the above-mentioned infant stroller frame, the second cross bar is provided with a hinge seat, the hinge seat is provided with a hinge shaft hole, and the upper end of the rear foot rod is rotatably connected to the corresponding hinge shaft hole.

[0019] In the above-mentioned infant stroller frame, the included angle between the axes of the two hinge shaft holes 202 is α, 180°>α>90°, and the included angle between the axes of the hinge shaft holes 202 and the axis of the second cross bar 200 is β, β<90°.

[0020] In the above-mentioned infant stroller frame, the first locking control assembly includes a handle switch assembly arranged on the handle bar and a handle bar locking assembly arranged between the end of the handle bar and the push rod, and a linkage is provided between the handle switch assembly and the handle bar locking assembly.

[0021] In the infant stroller frame as described above, the handle switch assembly includes a handle rotatably arranged on the handle rod and a drive block axially slidably arranged in the handle rod, the drive block is provided with a drive bevel groove, the inner side of the handle is provided with a latch pin extending into the drive bevel groove to cause the drive block to slide along the handle rod, and the drive block is connected to a linkage member.

[0022] The handle bar locking assembly includes a slider, a trigger block, a lock tongue and an elastic reset member, the slider can be slidably arranged on the trigger block, the two ends of the elastic reset member respectively abut against the slider and the trigger block, the lower end of the linkage member is connected to the slider, the slider is provided with a guide inclined groove, the trigger block is provided with a telescopic control groove arranged along the radial direction of the handle bar, the lock tongue is connected to the trigger block through a pin shaft passing through the guide inclined groove and the telescopic control groove, the handle bar locking assembly also includes a lock hole arranged on the push rod for cooperating with the lock tongue, when the linkage member pulls the slider, the free end of the lock tongue exits the lock hole, so that the handle bar can telescopically slide relative to the push rod.

[0023] As described above, a baby stroller frame, the joint includes an upper joint block connected to the lower end of the push rod and a lower joint block connected to the upper end of the front foot rod, a locking slot is provided between the upper joint block and the lower joint block, the joint also includes a joint locking block and a joint locking reset piece, the joint locking block can be movably embedded in the locking slot, the joint locking reset piece is arranged between the joint locking block and the upper joint block or the lower joint block, and correspondingly, a joint unlocking guide inclined surface is provided on the side of the joint locking block away from the joint locking reset piece, when the lower end of the handlebar rod directly or indirectly contacts the joint unlocking guide inclined surface, the joint locking block can be disengaged from the locking slot on the upper joint block or the lower joint block, and then the lower joint block can rotate relative to the upper joint block.

[0024] As described above, in an infant stroller frame, the joint further comprises a wedge block, wherein the wedge block has a wedge surface which cooperates with the joint unlocking guide inclined surface. When the lower end of the handlebar rod abuts against the upper end of the wedge block so that the wedge surface squeezes the joint unlocking guide inclined surface, the joint locking block can be disengaged from the locking groove on the upper joint block or the lower joint block, and the lower joint block can then rotate relative to the upper joint block.

[0025] As described above, in an infant stroller frame, the second locking control assembly comprises a hook, a lock hook and a lock hook reset member, wherein the hook is arranged on a sliding member, the middle portion of the lock hook is hinged to the upper portion of the rear foot rod, the lock hook reset member is arranged between one end of the lock hook and the rear foot rod to elastically press the lock hook so that the lock hook is buckled on the hook, and the lock hook is connected to an unlocking pull rope / belt for pulling the lock hook so that the lock hook is separated from the hook.

[0026] In the infant stroller frame as described above, the universal hinge structure is a spherical hinge structure, and the secondary rotatable hinge structure includes a first steering joint and a second steering joint, the first steering joint is directly or indirectly pivoted to the push rod, one end of the second steering joint is pivoted to the first steering joint, and the other end of the second steering joint is relatively fixed and connected to the rear linkage rod.

[0027] The present invention also provides another infant bicycle frame, which is characterized by comprising:

[0028] A front foot rod, wherein a front wheel assembly is arranged at the lower end of the front foot rod.

[0029] A rear foot rod, wherein a rear wheel assembly is arranged at the lower end of the rear foot rod.

[0030] A push rod is provided with a relatively rotatable joint between the lower end of the push rod and the upper end of the front foot rod.

[0031] A sliding member is connected to the rear foot rod and can slide relative to the rear foot rod.

[0032] A rear linkage rod, wherein the lower end of the rear linkage rod is connected to the sliding member via a universal hinge structure, the upper end of the rear linkage rod is directly or indirectly connected to the push rod via a universal hinge structure, or the upper end of the rear linkage rod is directly or indirectly connected to the push rod via at least a secondary hinge structure.

[0033] The push rod is provided with a first locking control component for controlling the unlocking of the joint.

[0034] A second locking control assembly is provided between the rear foot rod and the sliding member for locking the sliding member on the rear foot rod when the frame is unfolded.

[0035] Compared with the prior art, the infant carriage frame of the present invention has the following advantages:

[0036] 1. A first locking control assembly, a joint, and a second locking control assembly are respectively provided between the handlebar and the push rod, between the push rod and the front foot rod, and between the sliding member and the rear foot rod. The entire frame has three locking and unlocking mechanisms, so that the frame can be unlocked safely and orderly, avoiding the phenomenon that the infant frame is folded due to misoperation of the unlocking when there are infants on the seat of the frame. Therefore, the design scheme is safe and reliable to use.

[0037] 2. When folding, the user can first use one hand to activate the first locking control component to unlock the handlebar, and then the lower end of the handlebar can trigger the joint unlocking, and the push rod will flip backward and downward under the action of gravity. At this time, the user will pull the second locking control component, and under the action of gravity and the front linkage rod and the rear linkage rod, the front foot rod and the push rod will move close to the rear foot rod. After fully folded, the entire frame is in an upright state, which is convenient to fold.

[0038] 3. The upper end of the rear foot rod is connected through the hinge shaft hole of the hinge seat, and the hinge shaft hole is inclined relative to the second cross bar, so that the rear wheel assemblies of the two rear foot rods are located inside the two front wheel assemblies after being folded, and the distance between the two rear wheel assemblies is greater than the distance between the two front wheel assemblies when the frame is unfolded.

[0039] 4. A plurality of lock holes are provided on the push rod. By acting on the first locking control component, the telescopic length of the handle rod can be adjusted to adjust the comfort of the user.

[0040] 5. A first cross bar is relatively fixedly connected between the two front foot rods, and a second cross bar is relatively fixedly connected between the two joints. Through the connection between the first cross bar and the second cross bar, the connection of the entire frame is more reliable and stable.

[0041] 6. The two ends of the rear linkage rod are connected to the push rod and the sliding member through a universal hinge structure, or the upper end of the rear linkage rod is connected to the push rod through at least two levels of rotatable hinge structures, so that the rear foot rod can be smoothly folded inward during the folding process to avoid interference.

Brief Description of the Drawings

[0042] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0043] Figure 1 is a side view of the present invention;

[0044] Figure 2 It is one of the three-dimensional structural schematic diagrams of the present invention;

[0045] Figure 3 This is the second schematic diagram of the three-dimensional structure of the present invention;

[0046] Figure 4 An exploded view of the connection structure between the handlebar locking assembly, the push rod and the handlebar in the present invention;

[0047] Figure 5 An exploded view of the handle bar locking assembly of the present invention;

[0048] Figure 6 An exploded view of the handle switch assembly of the present invention;

[0049] Figure 7 An exploded view of a joint in the present invention;

[0050] Figure 8 For the present invention Figure 3 Magnified view of marker A;

[0051] Fig. 9 It is a schematic diagram of the structure of the connection between the second cross bar and the hinge seat in the present invention;

[0052] Fig.10 An exploded view of the second locking control assembly of the present invention;

[0053] Fig.11 It is a schematic diagram of the structure in which the rear linkage rod is respectively connected to the sliding member and the push rod in the present invention;

[0054] Fig.12 A reference diagram of the folded state of the present invention;

[0055] Fig.13 It is a side view of an embodiment of the present invention in which the front linkage rod is omitted. [Specific implementation method]

[0056] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0057] like Fig.13 As shown, an infant stroller frame of the present invention comprises a front foot bar 1, a rear foot bar 2, a push rod 3, a handle bar 31, a sliding member 5 and a rear linkage rod 7. The front foot bar 1 is provided with a front wheel assembly at the lower end, and the rear foot bar 2 is provided with a rear wheel assembly at the lower end.

[0058] A relatively rotatable joint 4 is provided between the lower end of the push rod 3 and the upper end of the front foot rod 1. When the frame is unfolded, the joint 4 can automatically lock the push rod 2 and the front foot rod 1 relative to each other. When the lower end of the handlebar is pressed against the joint 4, the joint 4 is forced to unlock, so that the push rod can be folded backward relative to the front foot rod.

[0059] The sliding member 5 is connected to the rear foot rod 2 and can slide relative to the rear foot rod 2. The rear foot rod is provided with a slide groove 21. The sliding member is provided with a guide block placed in the slide groove. A second locking control component 9 is provided between the rear foot rod 2 and the sliding member 5 for locking the sliding member 5 on the rear foot rod 2 when the frame is unfolded. When unfolded, the sliding member is locked to the upper part of the rear foot rod by the second locking control component.

[0060] The rear linkage rod 7, the lower end of which is connected to the sliding member 5 via a universal hinge structure, the upper end of which is directly or indirectly connected to the push rod 3 via a universal hinge structure, or the upper end of which is directly or indirectly connected to the push rod 3 via at least two levels of rotatable hinge structures. Fig.11As shown, in the embodiment of the present invention, the universal joint structure is a spherical joint structure, and the secondary rotatable joint structure includes a first steering joint 71 and a second steering joint 72, wherein the first steering joint 71 is directly or indirectly pivoted to the push rod 3, one end of the second steering joint 72 is pivoted to the first steering joint 71, and the other end of the second steering joint 72 is relatively fixedly connected to the rear linkage rod 7, so that the rear linkage rod 7 can have two degrees of rotational freedom in two different directions relative to the push rod 3, so when folding and storing the vehicle, the lower ends of the two rear leg rods 2 can be folded toward the inner sides of the two front leg rods without causing interference, thereby ensuring smooth folding, making it compact and minimizing the volume.

[0061] When the second locking control assembly is actuated to unlock the sliding member, the push rod is folded downward and backward under the action of gravity, and acts on the sliding member through the rear linkage rod, so that the sliding member slides along the rear end of the rear foot rod.

[0062] The upper part of the push rod 3 is telescopically connected to a handle rod 31, and a first locking control component 8 is provided between the handle rod 31 and the push rod 3 for controlling the extension and retraction of the handle rod 31 relative to the push rod 3 and unlocking the joint 4 after the handle rod 31 is contracted. The first locking control component 8 can be used to adjust the extension and retraction length of the handle rod 31 relative to the push rod to adapt to the user's height and length.

[0063] like Figure 1-3 As shown, in order to facilitate the folding and unfolding of the frame, the sliding member 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 member slides downward, and the front foot rod is pulled toward the rear foot rod through the front linkage rod.

[0064] In order to strengthen the connection, a first cross bar 100 is provided between the two front foot bars 2, the front end of the front linkage bar 6 is hinged to the first cross bar 100, and the hinge point between the front linkage bar 6 and the first cross bar is located between the inner sides of the two front foot bars.

[0065] Likewise, if Fig. 9 As shown, a second crossbar 200 is provided between the two joints 4, and the upper end of the rear foot rod 2 is hinged to the second crossbar 200 or the seat plate. The second crossbar 200 is provided with a hinge seat 201, and the hinge seat 201 is provided with a hinge shaft hole 202, and the upper end of the rear foot rod 2 is rotatably connected to the corresponding hinge shaft hole 202. Fig. 9 As shown, 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°. Since the hinge shaft hole is arranged obliquely relative to the second cross bar, the rear wheel assemblies of the two rear foot rods are located inside the two front wheel assemblies after being folded, and when the frame is unfolded, the distance between the two rear wheel assemblies is greater than the distance between the two front wheel assemblies.

[0066] like Figure 4-6 As shown, the first locking control assembly 8 includes a handle switch assembly 81 arranged on the handle bar and a handle bar locking assembly 82 arranged between the end of the handle bar and the push rod, and a linkage member 83 is provided between the handle switch assembly 81 and the handle bar locking assembly 82.

[0067] like Figure 6 As shown, the handle switch assembly 81 includes a handle 811 rotatably disposed on the handle rod 31 and a drive block 812 axially slidably disposed in the handle rod 31, the drive block 812 is provided with a drive inclined slot 813, the inner side of the handle 811 is provided with a bayonet 814 extending into the drive inclined slot 83 to force the drive block 812 to slide along the handle rod 31, and the drive block 812 is connected to the linkage member 83. When in use, the handle is rotated accordingly, and the bayonet acts on the drive block on the drive inclined slot, so that the two drive blocks slide toward each other, and then the linkage member can be pulled.

[0068] like Figure 4 As shown, the handle bar locking assembly 82 includes a slider 821, a trigger block 822, a lock tongue 823 and an elastic reset member 824. The slider 821 is slidably arranged on the trigger block 822. The two ends of the elastic reset member 824 respectively abut against the slider 821 and the trigger block 822. The lower end of the linkage member 83 is connected to the slider 821. The slider 821 is provided with a guide inclined groove 825. The trigger block 822 is provided with a telescopic control groove 826 arranged along the radial direction of the handle bar 31. The lock tongue 823 is connected to the trigger block 821 through a pin shaft passing through the guide inclined groove 825 and the telescopic control groove 826. The handle bar locking assembly 82 also includes a lock hole 827 arranged on the push rod for cooperating with the lock tongue 823. As needed, a plurality of lock holes 827 can be designed. When the linkage member 83 pulls the slider 821, the free end of the lock tongue 823 exits the lock hole 827, so that the handle bar can telescopically slide relative to the push rod. When the linkage is pulled, the lower end of the linkage overcomes the elastic reset member and pulls the slider to move. The pin on the lock tongue, in cooperation with the guide bevel groove 825 and the telescopic control groove 826, causes the lock tongue to retract out of the lock hole. Therefore, the telescopic length of the handle rod can be adjusted, and the handle rod can be unlocked so that the lower end presses the joint to unlock.

[0069] like Figure 7As shown, 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 groove 43 is provided between the upper joint block 41 and the lower joint block 42, and the joint 4 also includes a joint locking block 44 and a joint locking reset member 45, the joint locking block 44 can be movably embedded in the locking groove 43, the joint locking reset member 45 is arranged between the joint locking block 44 and the upper joint block 41 or the lower joint block 42, and correspondingly, a joint unlocking guide inclined surface 46 is provided on the side of the joint locking block 44 away from the joint locking reset member 45, when the lower end of the handlebar rod directly or indirectly contacts the joint unlocking guide inclined surface 46, the joint locking block 44 can be disengaged from the locking groove 43 on the upper joint block 41 or the lower joint block 42, and then the lower joint block 42 can rotate relative to the upper joint block 41.

[0070] In the present invention, the joint 4 also includes a wedge block 47, which has a wedge surface 471 that cooperates with the joint unlocking guide inclined surface 46. When the lower end of the handlebar contacts the upper end of the wedge block 47 so that the wedge surface 471 squeezes the joint unlocking guide inclined surface 46, the joint locking block 44 can be disengaged from the locking 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.

[0071] like Figure 8 and 10 As shown, the second locking control assembly 9 includes a hook 91, a lock hook 92 and a lock hook reset member 93, the hook 91 is arranged on the sliding member 5, the middle part of the lock hook 92 is hinged to the upper part of the rear foot rod, the lock hook reset member 93 is arranged between one end of the lock hook 92 and the rear foot rod to elastically press the lock hook 92 so that the lock hook 92 is buckled on the hook 91, and the lock hook 92 is connected to an unlocking pull rope / belt 94 for pulling the lock hook 92 to disengage the lock hook 92 from the hook 91.

[0072] When the present invention is folded, the handle of the first locking control assembly is rotated accordingly, and the driving block slides relative to the handle bar to pull the linkage, and the lower end of the linkage pulls the slider, and the slider causes the lock tongue to retract out of the lock hole. At this time, the handle bar can be retracted and adjusted relative to the push rod, and when the trigger block at the lower end of the handle bar presses the trigger pressing wedge block, the wedge surface presses the joint unlocking guide inclined surface, so that the joint locking block 44 is disengaged from the locking slot 43 on the upper joint block 41 or the lower joint block 42, and then the lower joint block 42 can rotate relative to the upper joint block 41. Afterwards, the user pulls the unlocking pull rope / belt 94 upwards to disengage the lock hook 92 from the hook 91, and the sliding member is unlocked. Under the action of gravity, the push rod folds downward and moves closer to the rear foot rod, and the sliding member slides toward 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. After the folding is finally completed, as shown in FIG. Fig.11As shown, the entire frame is in an upright state and can be operated by a single person with one hand. It adopts three locking and unlocking structures, namely, the joint, the first locking control component and the second locking control component, so that the frame can be unlocked safely and orderly, avoiding the problem of pinching caused by misoperation.

[0073] As another embodiment of an infant stroller frame of the present invention, it includes: a front foot rod 1, a rear foot rod 2, a push rod 3, a sliding member 5 and a rear linkage rod 7, wherein the front foot rod 1 has a front wheel assembly at the lower end; the rear foot rod 2 has a rear wheel assembly at the lower end; a relatively rotatable joint 4 is provided 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 the joint structure disclosed in Chinese Patent No. 2016211829323.

[0074] The sliding member 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 to the sliding member 5 via a universal hinge structure. The upper end of the rear linkage rod 7 is directly or indirectly connected to the push rod 3 via 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 to the push rod 3 via at least a secondary hinge structure, such as a spherical hinge structure. Fig.11 shown.

[0075] As required, the push rod in this embodiment can also be designed with a retractable structure. The push rod 3 is provided with a first locking control component 8 for controlling the unlocking of the joint 4. The first locking control component 8 can adopt the unlocking component disclosed in Chinese Patent No. 2016211829323. A second locking control component 9 is provided between the rear foot rod 2 and the sliding member 5 for locking the sliding member 5 on the rear foot rod 2 when the frame is unfolded. The second locking control component 9 is as shown in FIG. Fig.10 shown.

Claims

1. A baby stroller frame, characterized in that include: A front foot rod (1), wherein a front wheel assembly is provided at the lower end of the front foot rod (1); A rear foot rod (2), wherein a rear wheel assembly is provided at the lower end of the rear foot rod (2); A push rod (3), wherein a joint (4) capable of relatively rotating is provided between the lower end of the push rod (3) and the upper end of the front foot rod (1); A sliding member (5), the sliding member (5) being connected to the rear foot rod (2) and being able to slide relative to the rear foot rod (2); A rear linkage rod (7), wherein the lower end of the rear linkage rod (7) is connected to the sliding member (5) via a universal hinge structure, the upper end of the rear linkage rod (7) is directly or indirectly connected to the push rod (3) via a universal hinge structure, or the upper end of the rear linkage rod (7) is directly or indirectly connected to the push rod (3) via at least two levels of rotatable hinge structures; The upper part of the push rod (3) is telescopically connected to a handle rod (31), and a first locking control component (8) is provided between the handle rod (31) and the push rod (3) for controlling the extension and retraction of the handle rod (31) relative to the push rod (3) and for unlocking the joint (4) after the handle rod (31) is contracted; A second locking control assembly (9) is provided between the rear foot rod (2) and the sliding member (5) for locking the sliding member (5) on the rear foot rod (2) when the frame is unfolded; The sliding member (5) is hingedly connected to a front linkage rod (6), and the front end of the front linkage rod (6) is directly or indirectly hingedly connected to the front foot rod (1); The universal joint structure is a spherical joint structure, and the secondary rotatable joint structure comprises a first steering joint (71) and a second steering joint (72), wherein the first steering joint (71) is directly or indirectly pivoted to the push rod (3), one end of the second steering joint (72) is pivoted to the first steering joint (71), and the other end of the second steering joint (72) is relatively fixedly connected to the rear linkage rod (7); A second crossbar (200) is provided 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 to the second crossbar (200); The second cross bar (200) is provided with a hinge seat (201), the hinge seat (201) is provided with a hinge axis hole (202), and the upper end of the rear foot rod (2) is rotatably connected to the corresponding hinge axis hole (202); the axis angle between the two hinge axis holes (202) is α, 180°>α>90°, and the axis angle between the axis of the hinge axis hole (202) and the axis of the second cross bar (200) is β, β<90°.

2. The infant stroller frame according to claim 1, characterized in that A first cross bar (100) is provided between the two front foot bars (2), and the front linking bar (6) is indirectly hinged to the front foot bar (1) via the first cross bar (100).

3. The infant stroller frame according to claim 1, characterized in that The first locking control assembly (8) comprises a handle switch assembly (81) arranged on the handle bar and a handle bar locking assembly (82) arranged between the end of the handle bar and the push rod, and a linkage member (83) is arranged between the handle switch assembly (81) and the handle bar locking assembly (82).

4. The infant stroller frame according to claim 3, characterized in that The handle switch assembly (81) comprises a handle (811) rotatably arranged on the handle rod (31) and a driving block (812) axially slidably arranged in the handle rod (31); the driving block (812) is provided with a driving inclined groove (813); the inner side of the handle (811) is provided with a latch (814) extending into the driving inclined groove (83) to cause the driving block (812) to slide along the handle rod (31); the driving block (812) is connected to a linkage member (83); The handlebar locking assembly (82) comprises a slider (821), a trigger block (822), a locking tongue (823) and an elastic reset member (824); the slider (821) is slidably arranged on the trigger block (822); two ends of the elastic reset member (824) respectively abut against the slider (821) and the trigger block (822); the lower end of the linkage member (83) is connected to the slider (821); the slider (821) is provided with a guide inclined groove (825); the trigger block (822) is provided with a locking tongue (823); A telescopic control groove (826) is radially arranged on the handle bar (31), and the locking tongue (823) is connected to the trigger block (821) by a pin shaft passing through the guide inclined groove (825) and the telescopic control groove (826). The handle bar locking assembly (82) also includes a locking hole (827) arranged on the push rod for cooperating with the locking tongue (823). When the linkage member (83) pulls the slider (821), the free end of the locking tongue (823) exits the locking hole (827), so that the handle bar can telescopically slide relative to the push rod.

5. The infant stroller frame according to claim 1, characterized in that The joint (4) comprises 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), and the joint (4) further comprises a joint locking block (44) and a joint locking reset member (45), the joint locking block (44) being movably embedded in the locking slot (43), and the joint locking reset member (45) being arranged on the joint locking block (44). ) and the upper joint block (41) or the lower joint block (42), and a joint unlocking guide inclined surface (46) is provided on a side of the joint locking block (44) which is away from the joint locking reset member (45). When the lower end of the handle bar directly or indirectly contacts the joint unlocking guide inclined surface (46), the joint locking block (44) can be disengaged from the locking groove (43) on the upper joint block (41) or the lower joint block (42), so that the lower joint block (42) can rotate relative to the upper joint block (41).

6. The infant stroller frame according to claim 5, characterized in that The joint (4) further comprises a wedge block (47), wherein the wedge block (47) has a wedge surface (471) matched with the joint unlocking guide inclined surface (46); when the lower end of the handle bar contacts the upper end of the wedge block (47) so that the wedge surface (471) presses the joint unlocking guide inclined surface (46), the joint locking block (44) can be disengaged from the locking groove (43) on the upper joint block (41) or the lower joint block (42), and the upper joint block (41) can be rotated relative to the lower joint block (42).

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

8. An infant stroller frame, characterized in that include: A front foot rod (1), wherein a front wheel assembly is provided at the lower end of the front foot rod (1); A rear foot rod (2), wherein a rear wheel assembly is provided at the lower end of the rear foot rod (2); A push rod (3), wherein a joint (4) capable of relatively rotating is provided between the lower end of the push rod (3) and the upper end of the front foot rod (1); A sliding member (5), the sliding member (5) being connected to the rear foot rod (2) and being able to slide relative to the rear foot rod (2); A rear linkage rod (7), wherein the lower end of the rear linkage rod (7) is connected to the sliding member (5) via a universal hinge structure, the upper end of the rear linkage rod (7) is directly or indirectly connected to the push rod (3) via a universal hinge structure, or the upper end of the rear linkage rod (7) is directly or indirectly connected to the push rod (3) via at least two levels of rotatable hinge structures; The push rod (3) is provided with a first locking control component (8) for controlling the unlocking of the joint (4); A second locking control assembly (9) is provided between the rear foot rod (2) and the sliding member (5) for locking the sliding member (5) on the rear foot rod (2) when the frame is unfolded; The sliding member (5) is hingedly connected to a front linkage rod (6), and the front end of the front linkage rod (6) is directly or indirectly hingedly connected to the front foot rod (1); The universal joint structure is a spherical joint structure, and the secondary rotatable joint structure comprises a first steering joint (71) and a second steering joint (72), wherein the first steering joint (71) is directly or indirectly pivoted to the push rod (3), one end of the second steering joint (72) is pivoted to the first steering joint (71), and the other end of the second steering joint (72) is relatively fixedly connected to the rear linkage rod (7); A second crossbar (200) is provided 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 to the second crossbar (200); The second cross bar (200) is provided with a hinge seat (201), the hinge seat (201) is provided with a hinge axis hole (202), and the upper end of the rear foot rod (2) is rotatably connected to the corresponding hinge axis hole (202); the axis angle between the two hinge axis holes (202) is α, 180°>α>90°, and the axis angle between the axis of the hinge axis hole (202) and the axis of the second cross bar (200) is β, β<90°.

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