CN120440103A - A child stroller frame - Google Patents

Abstract

The present invention discloses a child stroller frame, comprising a first support rod and a second support rod, both of which are connected to wheels. The first support rod is provided with a sliding member capable of sliding relative thereto. The sliding member is rotatably connected to an upper support rod about a first axis A. A push rod is connected to the upper end of the upper support rod. The push rod is rotatably connected to the upper support rod about a second axis B near its lower end. A linkage member is provided between the lower end of the push rod and the upper end of the first support rod, articulating the two. The second support rod is rotatably connected to the sliding member or the upper support rod about a third axis C. A transmission member is further provided between the second support rod and the first support rod, rotatably connecting the two. A seat support member is provided between the upper support rod and the first support rod. The front end of the seat support member is rotatably connected to the upper support rod about an eleventh axis J, and the rear end is rotatably connected to the first support rod about a twelfth axis K. The present invention has a simple structure, flexible folding, and a small size when folded.

Description

Children's shallow skeleton

[ Field of technology ]

The invention relates to a stroller frame.

[ Background Art ]

Child carts are a common product of the growth of infants. The existing stroller frame is generally foldable for easy carrying or storage. In addition, the framework structure of the children cart in the market is various, and the folding action and the folding principle are different. In the prior art, many child cart frameworks have the problems of complex structure, inconvenient folding and large volume after folding.

The present invention has been made in view of the above-described drawbacks.

[ Invention ]

The invention aims to overcome the defects of the prior art and provide the baby stroller framework which is simple in structure, flexible to fold and small in volume after being folded.

The invention is realized by the following technical scheme:

The utility model provides a children's shallow skeleton, can follow expansion position and remove folding position after locking device unblock, including first bracing piece 11 and the second bracing piece 12 that all are connected with wheel 13, first bracing piece 11 on be equipped with the slider 2 that can slide relative to it, slider 2 on rotationally be connected with around first axis A and go up vaulting pole 3, last vaulting pole 3 upper end be connected with push rod 4, push rod 4 on and near its lower extreme position and last vaulting pole 3 around second axis B rotatable coupling, push rod 4 lower extreme and first bracing piece 11 upper end between be equipped with articulated linkage 5 of two, second bracing piece 12 rotationally connect on slider 2 or last vaulting pole 3 around third axis C, second bracing piece 12 and first bracing piece 11 between still be equipped with the driving medium 6 with rotatable connection of two, last vaulting pole 3 and first bracing piece 11 between be equipped with seat support 9, seat support 9 front end rotationally be connected around eleventh axis J on the last vaulting pole 3 and the twelve on the axis of rotation of first bracing piece 11.

The upper stay bar 3 is provided with a connecting seat 33, the seat support 9 comprises a seat bar 91 rotatably connected to the connecting seat 33 around an eleventh axis J, and the rear end of the seat bar 91 is rotatably connected to the first support bar 11 around a twelfth axis K.

The driving element 6 comprises a driving rod, one end of which is hinged on the first supporting rod 11 around the fourth axis D, and the other end of which is hinged on the second supporting rod 12 around the fifth axis E.

The linkage piece 5 comprises a linkage rod, one end of the linkage rod is hinged to the lower end of the hand push rod 4 around a sixth axis F, and the other end of the linkage rod is hinged to the upper end of the first support rod 11 around a seventh axis G.

When the stroller frame is in an unfolding state, the upper stay bar 3 and the hand push bar 4 form a straight line type structure.

When the stroller frame is in an unfolded state, the upper stay bar 3, the hand push bar 4 and the second support bar 12 are connected to form an L shape.

The first supporting rod 11 comprises a straight line section 111 and a bending section 112 bent relative to the straight line section 111, the sliding piece 2 is arranged on the straight line section 111, the linkage piece 5 is arranged between the upper end of the bending section 112 and the lower end of the hand push rod 4, and the upper supporting rod 3 is positioned on the front side of the bending section 112 when the stroller frame is in a unfolded state.

The baby stroller frame further comprises a handrail component 8, the handrail component 8 comprises a linkage piece 81, the lower end of the linkage piece 81 is hinged to the upper supporting rod 3 around an eighth axis N, a handrail rod 82 is hinged to the upper end of the linkage piece 81 around a ninth axis H, the rear end of the handrail rod 82 is hinged to the linkage piece 5 around a tenth axis I, and a grip 83 for children to grasp is connected to the front end of the handrail rod 82.

The baby stroller frame further comprises a backrest component 7, a first supporting seat 113 is arranged at the upper end of the first supporting rod 11, the backrest component 7 comprises a backrest seat 71 which is connected with the first supporting seat 113 and can rotate relative to the first supporting seat 113, the backrest seat 71 is provided with a backrest 72, the seat rod 91 is provided with a fixed seat 92, the seat rod 91 is provided with a sliding block 93 which can slide along the seat rod 91 and is positioned on the inner side of the fixed seat 92, the backrest seat 71 is provided with a limit groove 73 which can be clamped with the sliding block 93 when the baby stroller frame is in an unfolding state and the backrest 72 and the seat rod 91 are in a minimum included angle gear, and can be separated from the sliding block 93 when the baby stroller frame is in a folding process, and a first reset spring 94 which can push the sliding block 93 to reset is further arranged between the fixed seat 92 and the sliding block 93.

The upper supporting rod 3, the second supporting rod 12 and the sliding piece 2 are coaxially connected.

The locking device comprises a first locking component arranged between the hand push rod 4 and the upper end of the upper support rod 3 and a second locking component arranged between the lower end of the upper support rod 3 and the second support rod 12, the upper support rod 3 is internally provided with a linkage component which can pull the second locking component to unlock when the first locking component unlocks and the hand push rod 4 rotates relative to the upper support rod 3, the linkage component comprises a rotating seat 10e rotatably connected to the upper support rod 3, a second pull rope 10f which can pull the second locking component to unlock when the rotating seat 10e rotates is arranged between the rotating seat 10e and the second locking component, the hand push rod 4 is provided with a pushing part 10g, the rotating seat 10e is provided with a matching part 10h which can be in abutting fit with the pushing part 10g to enable the rotating seat 10e to rotate when the second hand push rod 4 rotates relative to the upper support rod 3, and a reset torsion spring 10i which can drive the rotating seat 10e to rotate and reset is also arranged between the rotating seat 10e and the upper support rod 3.

Compared with the prior art, the invention has the following advantages:

1. When the child stroller frame is folded, the hand push rod is rotated forwards, the hand push rod rotates relative to the upper support rod to be close to the upper support rod, the lower end of the hand push rod drives the linkage piece backwards, in the process, the linkage piece rotates relative to the first support rod, the seat support piece rotates relative to the upper support rod and the first support rod, the upper support rod rotates relative to the sliding piece and drives the sliding piece to slide along the first support rod, and in the sliding process, the sliding piece drives the second support rod to rotate relative to the sliding piece to be close to the first support rod through the transmission piece, so that the hand push rod, the upper support rod, the first support rod, the second support rod and the seat support piece are close together. Therefore, the whole stroller has a simple framework structure, is flexible to fold and has a small volume after being folded.

2. The upper stay bar is rotatably connected with a linkage piece, the upper end of the linkage piece is hinged with a grab bar, the rear end of the grab bar is hinged on the linkage piece, and the front end of the grab bar is connected with a grip for children to grasp. Therefore, when the framework of the baby stroller is folded, the grab rail rotates relative to the linkage piece and the linkage piece, and the linkage piece rotates relative to the upper supporting rod, so that the grab rail rotates towards the upper supporting rod to fold, and the folding operation of the grab rail assembly is simple, convenient and quick.

[ Description of the drawings ]

FIG. 1 is a perspective view of embodiment 1 of the present invention;

FIG. 2 is a side view of embodiment 1 of the present invention in an expanded state;

FIG. 3 is a side view of embodiment 1 of the present invention during folding;

FIG. 4 is a perspective view of embodiment 2 of the present invention;

FIG. 5 is a side view of embodiment 2 of the present invention in an expanded state;

FIG. 6 is a side view of embodiment 2 of the present invention during folding;

FIG. 7 is a cross-sectional view of a component of embodiment 2 of the present invention;

FIG. 8 is an enlarged view at X in FIG. 7;

fig. 9 is an enlarged view at Y in fig. 7;

FIG. 10 is a perspective view of embodiment 2 of the present invention during folding;

Fig. 11 is an enlarged view at M in fig. 4;

FIG. 12 is an enlarged view at Z in FIG. 10;

FIG. 13 is a side view showing a folded state of embodiment 2 of the present invention;

FIG. 14 is a perspective view of a component of embodiment 2 of the present invention;

FIG. 15 is an exploded view of embodiment 2 of the present invention;

Fig. 16 is an enlarged view at W in fig. 15;

Fig. 17 is an enlarged view at V in fig. 15.

[ Detailed description ] of the invention

The invention is further described below with reference to the accompanying drawings:

example 1:

As shown in fig. 1 to 3, a stroller frame can move from an unfolding position to a folding position after a locking device is unlocked, the stroller frame comprises a first supporting rod 11 and a second supporting rod 12 which are both connected with wheels 13, the first supporting rod 11 is provided with a sliding piece 2 which can slide relative to the first supporting rod, the sliding piece 2 is a sliding sleeve sleeved on the first supporting rod 11, the sliding piece 2 is rotatably connected with an upper supporting rod 3 around a first axis A, the upper end of the upper supporting rod 3 is connected with a hand pushing rod 4, the hand pushing rod 4 is rotatably connected with the upper supporting rod 3 around a second axis B near the lower end of the hand pushing rod 4, a linkage piece 5 hinged with the hand pushing rod 4 is arranged between the lower end of the hand pushing rod 4 and the upper end of the first supporting rod 11, the second supporting rod 12 is rotatably connected with the sliding piece 2 or the upper supporting rod 3 around a third axis C, a transmission piece 6 rotatably connected with the second supporting rod 12 is further arranged between the second supporting rod and the first supporting rod 11 around a seat 3 around a first axis A, the upper supporting rod 3 and the seat 11 is provided with a twelve supporting pieces rotatably connected with the seat support piece around a first supporting rod 9 around a second axis B, and the seat 11 around a second axis J is rotatably connected with the upper supporting rod around the first supporting rod 9, and the seat 11 around the upper end of the seat 11 around the first axis B, and the seat support rod is rotatably connected with the seat support 3 around the seat 3, and the seat support frame. In this embodiment, the upper stay 3, the second support rod 12 and the slider 2 are coaxially connected, i.e. the first axis a is collinear with the third axis C. The second support rod 12 may be disposed between the slider 2 and the upper support rod 3, in which case the upper support rod 3 is indirectly and rotatably connected to the slider 2, or the upper support rod 3 may be disposed between the slider 2 and the second support rod 12, in which case the upper support rod 3 is directly and rotatably connected to the slider 2. When the stroller frame is folded, the hand push rod 4 is rotated forwards, the hand push rod 4 rotates relative to the upper support rod 3 to be close to the upper support rod 3, the lower end of the hand push rod 4 pushes the linkage piece 5 backwards, in the process, the linkage piece 5 rotates relative to the first support rod 11, the seat support piece 9 rotates relative to the upper support rod 3 and the first support rod 11, the upper support rod 3 rotates relative to the sliding piece 2 and pushes the sliding piece 2 to slide along the first support rod 11, the sliding piece 2 drives the second support rod 12 to rotate relative to the sliding piece 2 to be close to the first support rod 11 through the transmission piece 6 in the sliding process, and finally the hand push rod 4, the upper support rod 3, the first support rod 11, the second support rod 12 and the seat support piece 9 are close together. Therefore, the whole stroller has a simple framework structure, is flexible to fold and has a small volume after being folded. In this embodiment, the locking device may be a conventional latch or gear type locking mechanism, which is not described herein.

As shown in fig. 1 to 3, the upper stay 3 is provided with a connection seat 33, the seat support 9 includes a seat bar 91 rotatably connected to the connection seat 33 about an eleventh axis J, and a rear end of the seat bar 91 is rotatably connected to the first support bar 11 about a twelfth axis K. Therefore, when the stroller frame is folded, the seat bar 91 rotates relative to the upper stay bar 3 and the first support bar 11, so that the upper stay bar 3 can smoothly push the sliding member 2 to slide along the first support bar 11, and the stroller frame is flexible to fold.

As shown in fig. 1 to 3, the driving element 6 comprises a driving rod, one end of which is hinged to the first supporting rod 11 about the fourth axis D and the other end of which is hinged to the second supporting rod 12 about the fifth axis E. Therefore, the movement of the second support bar 12 can be stabilized during the unfolding or folding of the stroller frame, and the stroller frame can be stabilized and reliable in the unfolded state.

As shown in fig. 1 to 3, the linkage member 5 includes a linkage rod, one end of which is hinged to the lower end of the hand push rod 4 around a sixth axis F, and the other end of which is hinged to the upper end of the first support rod 11 around a seventh axis G.

As shown in fig. 1 to 3, when the stroller frame is in an unfolded state, the upper stay bar 3 and the push bar 4 form a linear structure, and the upper stay bar 3, the push bar 4 and the second support bar 12 are connected in an L shape. Therefore, the framework of the baby stroller is simple and compact in structure and flexible to fold when being folded.

As shown in fig. 1 to 3, the first supporting rod 11 includes a straight line section 111 and a bending section 112 bent relative to the straight line section 111, the sliding member 2 is disposed on the straight line section 111, the linkage member 5 is disposed between the upper end of the bending section 112 and the lower end of the push rod 4, and the upper supporting rod 3 is located at the front side of the bending section 112 when the stroller frame is in the unfolded state. Therefore, the child stroller frame has simple and compact structure in an unfolding state and good stability, and can be folded flexibly when folded, and the child stroller frame has small volume and small occupied space after being folded.

Example 2:

as shown in fig. 4 to 13, embodiment 2 differs from embodiment 1 in that:

The baby stroller frame further comprises a backrest component 7, a first supporting seat 113 is arranged at the upper end of the first supporting rod 11, the backrest component 7 comprises a backrest seat 71 which is connected with the first supporting seat 113 and can rotate relative to the first supporting seat 113, the backrest seat 71 is provided with a backrest 72, the seat rod 91 is provided with a fixed seat 92, the seat rod 91 is provided with a sliding block 93 which can slide along the seat rod 91 and is positioned on the inner side of the fixed seat 92, the backrest seat 71 is provided with a limit groove 73 which can be clamped with the sliding block 93 when the baby stroller frame is in an unfolding state and the backrest 72 and the seat rod 91 are in a minimum included angle gear, and can be separated from the sliding block 93 when the baby stroller frame is in a folding process, and a first reset spring 94 which can push the sliding block 93 to reset is further arranged between the fixed seat 92 and the sliding block 93. The backrest assembly 7 can support the back of the child when the child sits, so that the child sits comfortably. And, when the framework of the baby stroller is unfolded and the backrest 72 and the seat rod 91 are in the minimum included angle gear, the sliding block 93 on the seat rod 91 is clamped with the limiting groove 73 on the backrest seat 71, so that the backrest 72 is limited, the included angle between the backrest 72 and the seat support 9 cannot be further reduced, so that the baby stroller is comfortable to sit, and when the framework of the baby stroller is folded, the sliding block 93 is separated from the limiting groove 73, at this time, the backrest 72 can be rotated forwards to reduce the included angle between the backrest 72 and the seat rod 91, so that the backrest 72 is folded, and in the process of rotating and folding the backrest 72, the outer peripheral surface of the backrest seat 71 pushes the sliding block 93 and compresses the first reset spring 94, so that the sliding block 93 can be reset in the process of unfolding the framework of the baby stroller.

As shown in fig. 15 and 16, the first support seat 113 and the backrest seat 71 are respectively provided with a plurality of ratchet grooves 74 along the circumferential direction, the first support seat 113 and the backrest seat 71 are internally provided with a clamping gear 75 capable of being simultaneously clamped with the ratchet grooves 74 on the first support seat 113 and the backrest seat 71, a fifth return spring 76 capable of pushing the clamping gear 75 to slide and return is arranged between the backrest seat 71 and the clamping gear 75, the backrest 72 is provided with an operation block 77, and a pull cable (not shown in the figure) capable of pulling the clamping gear 75 to move transversely is arranged between the operation block 77 and the clamping gear 75. The ratchet grooves 74 can be used for directly pulling the backrest 72 forwards under the condition that the operation block 77 is not operated, so that the included angle between the backrest 72 and the seat rod 91 is reduced, the backrest 72 and the seat rod 91 stay at a proper included angle gear, when the included angle between the backrest 72 and the seat rod 91 needs to be increased, the operation block 77 is operated, the clamping gear 75 is pulled by a pull rope, the clamping gear 75 is separated from the ratchet grooves on the first supporting seat 113, and the backrest 72 can be rotated backwards to adjust the angle. When the stroller frame is folded, the seat bar 91 rotates relative to the upper stay bar 3 and the first stay bar 11, and after a certain angle of rotation, the sliding block 93 is separated from the limiting groove 73, and the backrest 72 can be folded close to the seat support 9 by pulling the backrest 72 forward without the abutment of the sliding block 93.

As shown in fig. 4 to 13, the stroller frame of the present embodiment further includes a handrail assembly 8, the handrail assembly 8 includes a linkage piece 81 with a lower end hinged to the upper stay 3 about an eighth axis N, a handrail rod 82 is hinged to an upper end of the linkage piece 81 about a ninth axis H, a rear end of the handrail rod 82 is hinged to the linkage member 5 about a tenth axis I, and a grip 83 for grasping by a child is connected to a front end of the handrail rod 82. When the framework of the baby stroller is folded, the grab rail 82 rotates relative to the linkage piece 81 and the linkage piece 5, and the linkage piece 81 rotates relative to the upper supporting rod 3, so that the grab rail 82 rotates towards the upper supporting rod 3 to be folded, and the folding operation of the armrest assembly 8 is simple, convenient and quick.

As shown in fig. 15 to 17, the locking device includes a first locking component disposed between the push rod 4 and the upper end of the upper supporting rod 3, and a second locking component disposed between the lower end of the upper supporting rod 3 and the second supporting rod 12, the upper supporting rod 3 is further provided with a linkage component capable of pulling the second locking component to unlock when the first locking component unlocks and the push rod 4 rotates relative to the upper supporting rod 3, the linkage component includes a rotating seat 10e rotatably connected to the upper supporting rod 3, a second pull rope 10f capable of pulling the second locking component to unlock when the rotating seat 10e rotates is disposed between the rotating seat 10e and the second locking component, the push rod 4 is provided with a pushing portion 10g, the rotating seat 10e is provided with a fitting portion 10h capable of being in abutting fit with the pushing portion 10g when the second push rod 4 rotates relative to the upper supporting rod 3, and a reset torsion spring 10i capable of driving the rotating seat 10e to rotate is further disposed between the rotating seat 10e and the upper supporting rod 3. The first locking part is arranged between the hand push rod 4 and the upper end of the upper supporting rod 3, and the second locking part is arranged between the lower end of the upper supporting rod 3 and the second supporting rod 12, so that the framework of the child stroller is firmly locked in an unfolding state, and is stable and reliable. When the stroller needs to be folded, the second locking component can be unlocked through the linkage component only by unlocking the first locking component and then rotating the hand push rod 4, so that the whole stroller framework is convenient to unlock and operate, and the stroller is convenient and quick to fold.

The upper stay bar 3 comprises a first connecting shell 31, the push rod 4 comprises a second connecting shell 41, the pushing part 10g is arranged on the second connecting shell 41, the first locking component comprises a plurality of first locking grooves 101 arranged on the first connecting shell 31 and the second connecting shell 41 along the circumferential direction, locking splines 102 which can be simultaneously clamped with the first locking grooves 101 on the first connecting shell 31 and the second connecting shell 41 are arranged in the first connecting shell 31 and the second connecting shell 41, a first rotating block 103 capable of rotating is arranged between the locking splines 102 and the second connecting shell 41, a plurality of first oblique protrusions 104 which can push the first rotating block 103 to transversely move when the first rotating block 103 rotates so as to separate the locking splines 102 from the first locking grooves 101 on the second connecting shell 41 are arranged on the second connecting shell 41 along the circumferential direction, a second return spring 105 capable of pushing the locking spline 102 to slide and return is arranged between the first connecting shell 31 and the locking spline 102, an operation switch 106 is arranged on the push rod 4, a first pull rope 107 capable of pulling the first rotating block 103 to rotate is arranged between the operation switch 106 and the first rotating block 103, the locking spline 102 comprises a front half spline 1021 and a rear half spline 1022, when the stroller frame is in an unfolding state, the front half spline 1021 and the rear half spline 1022 are both clamped with the first locking grooves 101 on the first connecting shell 31 and the second connecting shell 41, and when the stroller frame is in a folding state, the front half spline 1021 is clamped with the first locking grooves 101 on the first connecting shell 31 and the second connecting shell 41, and the rear half spline 1022 is separated from the first locking grooves 101 on the second connecting shell 41; the second support bar 12 includes a third connection housing 121, the upper brace 3 further includes a fourth connection housing 32, the second locking component further comprises a plurality of second locking grooves 10a arranged on the third connecting shell 121 and the fourth connecting shell 32 along the circumferential direction, a locking gear 10b capable of being simultaneously clamped with the second locking grooves 10a on the third connecting shell 121 and the fourth connecting shell 32 is arranged in the third connecting shell 121 and the fourth connecting shell 32, a second rotating block 10c capable of rotating is arranged between the locking gear 10b and the fourth connecting shell 32, a plurality of second inclined protrusions capable of pushing the second rotating block 10c to transversely move when the second rotating block 10c rotates are arranged on the fourth connecting shell 32 along the circumferential direction, so that the locking gear 10b is separated from the second locking grooves 10a on the fourth connecting shell 32, and a third reset spring 10d capable of pushing the locking gear 10b to slide and reset is arranged between the third connecting shell 121 and the locking gear 10 b. when the locking device is unlocked, the first rotating block 103 is pulled to rotate by the first pull rope 107 by the operation seat switch 106, the first rotating block 103 is pushed by the first oblique bulge 104 on the second connecting shell 41 to move transversely when rotating, and the first rotating block 103 transversely pushes the locking spline 102 to be separated from the first locking groove 101 on the second connecting shell 41, so that the hand push rod 4 can be rotated relative to the upper supporting rod 3. In the rotation process of the push rod 4, the pushing part 10g on the second connecting shell 41 pushes the matching part 10h on the rotating seat 10e, so that the rotating seat 10e rotates relative to the upper supporting rod 3, the second rotating block 10c is pulled to rotate through the second pull rope 10f in the rotation process of the rotating seat 10e, the second rotating block 10c is pushed by the second oblique bulge (not shown in the figure) on the fourth connecting shell 32 to transversely move in the rotation process of the second rotating block 10c, the second rotating block 10c pushes the locking gear 10b to transversely move and separate from the second locking groove 10a on the fourth connecting shell 32, the upper supporting rod 3 and the second supporting rod 12 are unlocked at the moment, the sliding piece 2 can drive the second supporting rod 12 to rotate towards the first supporting rod 11 through the transmission piece 6 at the moment, and the upper supporting rod 3 and the upper supporting rod 4 can also rotate towards the first supporting rod 11 to close, so that the whole child skeleton cart is folded. The unlocking at a plurality of positions can be realized only by actuating the operation switch 106 during the folding operation, so that the folding operation of the framework of the baby stroller is simple, convenient and quick. And, when the baby stroller is in a folded state, the first half spline 1021 is clamped with the first locking grooves 101 on the first connecting shell 31 and the second connecting shell 41, so that the baby stroller is locked in the folded state and cannot be unfolded by mistake, and when the baby stroller framework needs to be unfolded, the operation switch 106 is only required to be operated, the first rotating block 103 is pulled to rotate through the first pull rope 107, and the first half spline 1021 is pushed to be separated from the first locking grooves 101 on the second connecting shell 41, so that the folded state can be unlocked.

Claims (11)

1. A stroller frame capable of moving from an unfolding position to a folding position after a locking device is unlocked is characterized by comprising a first supporting rod (11) and a second supporting rod (12), wherein the first supporting rod (11) and the second supporting rod are connected with wheels (13), a sliding piece (2) capable of sliding relative to the first supporting rod is arranged on the first supporting rod (11), an upper supporting rod (3) is rotatably connected on the sliding piece (2) around a first axis (A), a hand pushing rod (4) is connected at the upper end of the upper supporting rod (3), the hand pushing rod (4) is rotatably connected with the upper supporting rod (3) around a second axis (B) near the lower end of the hand pushing rod, a linkage piece (5) hinged with the lower end of the hand pushing rod (4) and the upper end of the first supporting rod (11) is arranged between the lower end of the hand pushing rod (4) and the upper end of the first supporting rod (11), the second supporting rod (12) is rotatably connected on the sliding piece (2) or the upper supporting rod (3) around a third axis (C), a transmission piece (6) is rotatably connected between the second supporting rod (12) and the first supporting rod (11) around a seat (9) and the upper supporting rod (9), the rear end is rotatably connected to the first support bar (11) about a twelfth axis (K).

2. The stroller frame according to claim 1, wherein the upper stay (3) is provided with a connecting seat (33), the seat support member (9) comprises a seat rod (91) rotatably connected to the connecting seat (33) about an eleventh axis (J), and the rear end of the seat rod (91) is rotatably connected to the first support bar (11) about a twelfth axis (K).

3. The stroller frame according to claim 1, wherein the driving member (6) comprises a driving rod, one end of the driving rod is hinged to the first supporting rod (11) around the fourth axis (D), and the other end of the driving rod is hinged to the second supporting rod (12) around the fifth axis (E).

4. The stroller frame according to claim 1, wherein the linkage member (5) comprises a linkage rod, one end of the linkage rod is hinged to the lower end of the stroller (4) around a sixth axis (F), and the other end of the linkage rod is hinged to the upper end of the first support rod (11) around a seventh axis (G).

5. The stroller frame according to claim 1, wherein the upper stay bar (3) and the hand push bar (4) form a linear structure when the stroller frame is in a unfolded state.

6. The stroller frame according to claim 5, wherein the upper stay bar (3), the hand push bar (4) and the second support bar (12) are connected in an L shape when the stroller frame is in the unfolded state.

7. The stroller frame according to claim 5, wherein the first support bar (11) comprises a straight line section (111) and a bending section (112) bent relative to the straight line section (111), the sliding member (2) is arranged on the straight line section (111), the linkage member (5) is arranged between the upper end of the bending section (112) and the lower end of the hand push bar (4), and the upper support bar (3) is positioned at the front side of the bending section (112) when the stroller frame is in the unfolded state.

8. The stroller frame according to any one of claims 1 to 7, further comprising a handrail assembly (8), wherein the handrail assembly (8) comprises a linkage piece (81) with a lower end hinged to the upper stay bar (3) around an eighth axis (N), a handrail bar (82) is hinged to the upper end of the linkage piece (81) around a ninth axis (H), a rear end of the handrail bar (82) is hinged to the linkage piece (5) around a tenth axis (I), and a grip (83) for a child to grasp is connected to the front end of the handrail bar (82).

9. The stroller frame according to any one of claims 1 to 7, further comprising a backrest assembly (7), wherein the upper end of the first supporting rod (11) is provided with a first supporting seat (113), the backrest assembly (7) comprises a backrest seat (71) which is connected with the first supporting seat (113) and can rotate relative to the first supporting seat (113), the backrest seat (71) is provided with a backrest (72), the seat rod (91) is provided with a fixing seat (92), the seat rod (91) is provided with a sliding block (93) which can slide along the seat rod (91) and is positioned on the inner side of the fixing seat (92), the backrest seat (71) is provided with a limit groove (73) which can be clamped with the sliding block (93) when the stroller frame is in a unfolded state and the backrest (72) and the seat rod (91) are in a minimum included angle gear, and can be separated from the sliding block (93) when the stroller frame is in a folding process, and a first reset spring (94) which can reset the sliding block (93) is pushed between the fixing seat (92) and the sliding block (93).

10. The stroller frame according to claim 1, wherein the upper stay bar (3), the second stay bar (12) and the sliding member (2) are coaxially connected.

11. The stroller frame according to claim 1, wherein the locking device comprises a first locking part arranged between the push rod (4) and the upper end of the upper supporting rod (3) and a second locking part arranged between the lower end of the upper supporting rod (3) and the second supporting rod (12), a linkage part capable of pulling the second locking part to unlock when the first locking part unlocks and the push rod (4) rotates relative to the upper supporting rod (3) is further arranged in the upper supporting rod (3), the linkage part comprises a rotating seat (10 e) rotatably connected to the upper supporting rod (3), a second pull rope (10 f) capable of pulling the second locking part to unlock when the rotating seat (10 e) rotates is arranged between the rotating seat (10 e) and the second locking part, a pushing part (10 g) is arranged on the push rod (4), a pushing part (10 h) capable of being matched with the pushing part (10 g) in a pushing way when the first push rod (4) rotates relative to the upper supporting rod (3) and enabling the rotating seat (10 e) to be matched with the rotating seat (10 e) in a pushing way, and a torsion spring (10 h) is further arranged between the rotating seat (10 e) and the rotating seat (10 h) capable of driving the rotating seat (10 h).