Improved folding frame of baby carriage

Abstract

The invention discloses an improved baby carriage folding frame which comprises a front wheel set frame, a rear wheel set frame and a handle frame, the front wheel set frame, the rear wheel set frame and the handle frame are jointly and rotationally connected through a first joint pivot, the baby carriage frame further comprises a seat plate, and the two sides of the seat plate are fixedly connected with side supporting rods respectively. One end of the side supporting rod is rotationally connected with the front wheel set frame, the middle position of the side supporting rod is rotationally connected with one end of the side supporting piece through a second joint pivot, and the other end of the side supporting piece is connected with the rear wheel set frame and the handle frame through a linkage mechanism; an unlocking mechanism is arranged on the seat plate and used for unlocking or locking the rotary connecting end between the side supporting piece and the second joint pivot. In the using process, folding or unfolding operation of the baby carriage frame can be linked, folding of the baby carriage frame is very simple, the working procedures are greatly reduced, and better experience feeling can be provided for a user.

Description

Technical Field

[0001] The invention relates to the technical field of folding baby carriage frames, and in particular to an improved folding baby carriage frame. Background Art

[0002] Strollers have become an indispensable product in the growth process of infants and young children, bringing great convenience to users when carrying infants and young children in daily life.

[0003] There are many types of existing baby strollers, and the number and connection positions of their frame rods are different, resulting in different folding principles, folding methods and folded effects. The existing baby stroller frame folding process is complicated and the operation is cumbersome. The seat bag assembly cannot be folded together. It often takes a long time for users to fold it, which is very inconvenient. Summary of the invention

[0004] The object of the present invention is to provide an improved folding frame of a baby stroller, so as to solve the problem of poor folding effect of the baby stroller frame in the prior art.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An improved folding baby carriage frame comprises a front wheel frame, a rear wheel frame and a handle frame, wherein the front wheel frame, the rear wheel frame and the handle frame are rotatably connected via a joint pivot 1, and further comprises a seat plate, both sides of the seat plate are respectively fixedly connected to side support rods, one end of the side support rods is rotatably connected to the front wheel frame, the middle position of the side support rods is rotatably connected to one end of a side support piece via a joint pivot 2, and the other end of the side support piece is respectively connected to the rear wheel frame and the handle frame via a linkage mechanism;

[0007] The seat plate is provided with an unlocking mechanism, which is used to unlock or lock the rotating connection end between the side branch piece and the second joint hub;

[0008] Wherein, when the baby carriage frame is in an unfolded state, the side support rods are kept horizontally flush with the side support pieces, and the rotating connection end between the side support pieces and the second joint pivot is locked by the unlocking mechanism;

[0009] When the baby carriage frame is in a folded state, the unlocking mechanism is used to unlock the rotating connection end between the side support piece and the joint hub 2, the side support rod pulls the front wheel assembly frame to move closer to and fold towards the rear wheel assembly frame, and the side support piece pulls the handle frame to move closer to and fold towards the rear wheel assembly frame through the linkage mechanism.

[0010] As a further solution of the present invention: the side support piece is connected to the U-shaped seat frame through a linkage mechanism;

[0011] Wherein, when the baby carriage frame is in an unfolded state, the side support pieces are kept flush with the seat frame;

[0012] When the baby carriage frame is in a folded state, the side support pieces pull the seat surround frame toward the rear wheel assembly frame through the linkage mechanism to be folded.

[0013] As a further solution of the present invention: the linkage mechanism comprises a fixing plate, a transmission plate and an arc-shaped support plate, the fixing plate is fixedly arranged on the rear wheel assembly frame, the top of the fixing plate is rotatably connected to the side support plate and the seat frame through a first pivot portion, the bottom of the fixing plate is rotatably connected to one end of the transmission plate through a second pivot portion, the other end of the transmission plate is rotatably connected to one end of the arc-shaped support plate, and the other end of the arc-shaped support plate is rotatably connected to the handle frame;

[0014] An arc-shaped guide hole is provided on the transmission plate, and a rotation pin shaft between the side support plate and the seat surround is slidably connected along the arc-shaped guide hole.

[0015] As a further solution of the present invention: a pivot hole three is provided at the end of the side support piece away from the joint pivot one, and a pivot hole two is provided on the side support piece. The pivot hole two is rotatably connected to the pivot part one, and the tail end of the pivot part one is rotatably connected to the end of the seat frame; the pivot hole three is rotatably connected to the seat frame via a rotating pin.

[0016] As a further solution of the present invention: a guide groove is provided on the fixing plate, and the guide groove is slidingly connected with the arc-shaped guide protrusion on the transmission plate.

[0017] As a further solution of the present invention: one end of the transmission sheet is provided with a fourth pivot hole, in which the second pivot part is rotatably connected; the other end of the transmission sheet is provided with a fifth pivot hole, in which the fifth pivot hole is rotatably connected to one end of the arc-shaped support sheet via a pin; the other end of the arc-shaped support sheet is provided with a sixth pivot hole, in which the sixth pivot hole is rotatably connected to the handle frame via a pin;

[0018] Wherein, when the baby carriage frame is in an unfolded state, the height of the pivot hole 5 from the ground is higher than the height of the pivot hole 4 from the ground;

[0019] When the baby carriage frame is in a folded state, the height of the pivot hole 5 from the ground is lower than the height of the pivot hole 4 from the ground.

[0020] As a further solution of the present invention: the unlocking mechanism includes an unlocking flap rotatably connected to the upper surface of the seat board, and unlocking rods of an integral structure are provided on both sides of the unlocking flap. The unlocking rods pass through the seat board and are connected to an unlocking pin rod, and the unlocking pin rod is used to unlock or lock the rotating connection end between the side branch plate and the joint hub 2.

[0021] As a further solution of the present invention: a pivot hole 1 and a lock hole are provided on the rotation connection end between the side branch piece and the joint pivot 2;

[0022] Wherein, when the baby carriage frame is in the unfolded state, the unlocking pin is inserted and connected with the lock hole;

[0023] When the baby carriage frame is in a folded state, the unlocking pull rod drives the unlocking pin rod to disengage from the locking hole. At this time, the first pivot hole is rotatably connected with the second joint pivot and the side support rod through the pin shaft.

[0024] As a further solution of the present invention: one end of a connecting rod is inserted on the second joint hub, a sliding hole is opened on the side wall of the connecting rod, and the L-shaped unlocking pin is slidably connected in the sliding hole.

[0025] As a further solution of the present invention: a return spring is provided at the end of the connecting rod, and the return spring is inserted into the lock hole to lock the unlocking pin.

[0026] Beneficial effects of the present invention:

[0027] (1) During the use of the present application, when the baby stroller frame is folded, the operator can operate the unlocking mechanism with one hand, and the unlocking mechanism unlocks the rotating connection end between the side support piece and the joint hub 2, and the handle frame is pressed down to make the linkage mechanism drive the side support piece and the side support rod to move synchronously, so as to realize that the front wheel assembly frame and the handle frame are moved together to the rear wheel assembly frame. During this folding and folding process, the seat plate is also folded and folded along with the side support rod. Compared with the prior art, the folding frame of the baby stroller of the present application can be linked, the folding frame is very simple and the process is greatly reduced, which can provide users with a better experience;

[0028] (2) During the use of the present application, when the baby stroller frame is unfolded, the operator only needs to lift the handle frame upward to open it, and under the action of the linkage mechanism, the front wheel frame and the handle frame are moved away from the rear wheel frame together until they are fully unfolded. During this process, when the baby stroller frame reaches the fully unfolded state, the unlocking mechanism locks the rotating connection end between the side support piece and the joint hinge 2, which can ensure that the baby stroller frame is unfolded safely and stably, and is easy to operate;

[0029] (3) During the use of the present application, the seat frame can be driven by a linkage mechanism to be folded synchronously, thus avoiding a secondary folding action. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] Figure 1 It is a schematic diagram of the structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the connection between the side branch piece and the linkage mechanism of the present invention;

[0033] Figure 3 It is a schematic diagram of the linkage mechanism structure of the present invention;

[0034] Figure 4 It is a schematic diagram of the disassembly of the linkage mechanism of the present invention;

[0035] Figure 5 It is a schematic diagram of a seat plate provided on a baby stroller frame of the present invention;

[0036] Figure 6 It is a schematic diagram of an unlocking mechanism provided on the seat plate of the present invention;

[0037] Figure 7 It is a schematic diagram of the unlocking mechanism structure of the present invention;

[0038] Figure 8 It is a schematic diagram of the locking connection between the unlocking mechanism and the side branch piece of the present invention;

[0039] Fig. 9 It is a schematic diagram of the contact connection between the return spring and the unlocking pin in the unlocking mechanism of the present invention;

[0040] Fig.10 It is a schematic diagram of the baby stroller frame of the present invention in a folded and collapsed state.

[0041] In the figure: 1. front wheel frame; 2. rear wheel frame; 3. handle frame; 4. joint hub 1; 5. side support rod; 6. side support plate; 60. pivot hole 1; 61. locking hole; 62. pivot hole 2; 63. pivot hole 3; 7. joint hub 2; 8. unlocking mechanism; 80. unlocking flap; 81. unlocking pull rod; 82. unlocking pin rod; 83. connecting rod; 830. sliding hole; 84. return spring; 9. linkage mechanism; 90. fixing plate; 900. pivot part 1; 901. pivot part 2; 902. guide groove; 91. transmission plate; 910. pivot hole 4; 911. pivot hole 5; 912. arc guide hole; 913. guide protrusion; 92. arc support plate; 920. pivot hole 6; 10. seat frame; 11. seat plate. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in the description of the present invention, the meaning of "multiple" and "several" is at least two, for example two, three, etc., unless otherwise clearly and specifically defined.

[0044] See also Figures 1 to 10 As shown, the present invention is an improved folding frame of a baby stroller, comprising a front wheel assembly frame 1, a rear wheel assembly frame 2 and a handle frame 3, the front wheel assembly frame 1, the rear wheel assembly frame 2 and the handle frame 3 are rotatably connected together through a joint pivot 1 4, the baby stroller frame also includes a seat plate 11, both sides of the seat plate 11 are respectively fixedly connected to side support rods 5, one end of the side support rod 5 is rotatably connected to the front wheel assembly frame 1, the middle position of the side support rod 5 is rotatably connected to one end of a side support piece 6 through a joint pivot 2 7, and the other end of the side support piece 6 is respectively connected to the rear wheel assembly frame 2 and the handle frame 3 through a linkage mechanism 9; an unlocking mechanism 8 is provided on the seat plate 11, and the unlocking mechanism 8 is used to unlock or lock the rotatably connected end between the side support piece 6 and the joint pivot 2 7.

[0045] Among them, when the baby stroller frame is in the unfolded state, the side support rod 5 and the side support piece 6 are kept horizontal and flush, and the rotating connection end between the side support piece 6 and the joint pivot 2 7 is locked by the unlocking mechanism 8; when the baby stroller frame is in the folded state, the unlocking mechanism 8 is used to unlock the rotating connection end between the side support piece 6 and the joint pivot 2 7, and the side support rod 5 pulls the front wheel assembly frame 1 to move closer to the rear wheel assembly frame 2, and the side support piece 6 pulls the handlebar frame 3 to move closer to the rear wheel assembly frame 2 through the linkage mechanism 9.

[0046] During use of the present application, the seat plate 11 at the seat pocket position is supported and connected by the side support rods 5 arranged on both sides. When the baby stroller frame is folded, the operator can operate the unlocking mechanism 8 with one hand. The unlocking mechanism 8 unlocks the rotating connection end between the side support piece 6 and the joint hub 2 7, and the handle frame 3 can be rotated and pressed down along the joint hub 1 4. The handle frame 3 is pressed down to enable the linkage mechanism 9 to drive the side support piece 6 and the side support rod 5 to move synchronously, so as to realize the front wheel assembly frame 1 and the handle frame 3 to move closer to the rear wheel assembly frame 2 together. During this folding and folding process, the seat plate 11 also follows the side support rod 5 to be folded and folded. Compared with the prior art, the folding frame of the baby stroller of the present application can be linked, the folding frame is very simple and the process is greatly reduced, which can provide users with a better experience.

[0047] During the use of the present application, when the baby stroller frame is unfolded, contrary to the above-mentioned folding and folding process, the operator only needs to lift the handle frame 3 upward to open it, and under the action of the linkage mechanism 9, the front wheel assembly frame 1 and the handle frame 3 are moved away from the rear wheel assembly frame 2 until they are fully unfolded. During this process, when the baby stroller frame reaches the fully unfolded state, the unlocking mechanism 8 locks the rotating connection end between the side branch piece 6 and the joint pivot 2 7, which can ensure that the baby stroller frame is unfolded safely and stably and is easy to operate.

[0048] In this specific implementation mode, Figure 1 and Fig.10 As shown, the side support piece 6 is connected to the U-shaped seat frame 10 through a linkage mechanism 9; wherein, when the baby stroller frame is in an unfolded state, the side support piece 6 and the seat frame 10 are kept horizontal and flush; when the baby stroller frame is in a folded state, the side support piece 6 pulls the seat frame 10 to move closer to the rear wheel frame 2 through the linkage mechanism 9; during the use of the present application, the seat frame 10 can be driven by the linkage mechanism 9 to be folded synchronously to avoid a secondary folding action.

[0049] In this specific implementation mode, Figures 2 to 4 As shown, the linkage mechanism 9 includes a fixed plate 90, a transmission plate 91 and an arcuate support plate 92. The fixed plate 90 is fixedly mounted on the rear wheel assembly frame 2. The top of the fixed plate 90 is rotatably connected to the side support plate 6 and the seat frame 10 through a pivot portion 1 900. The bottom is rotatably connected to one end of the transmission plate 91 through a pivot portion 2 901. The other end of the transmission plate 91 is rotatably connected to one end of the arcuate support plate 92. The other end of the arcuate support plate 92 is rotatably connected to the handle frame 3. An arcuate guide hole 912 is provided on the transmission plate 91. The rotating pin shaft between the side support plate 6 and the seat frame 10 is slidably connected along the arcuate guide hole 912.

[0050] During the use of the linkage mechanism 9 of the present application, when the baby stroller frame is folded, the handle frame 3 is pressed down and rotated downward along the joint pivot 4, the handle frame 3 drives the arc-shaped support piece 92 to rotate downward, and the arc-shaped support piece 92 pushes the transmission piece 91 to rotate downward. At this time, the arc-shaped guide hole 912 on the transmission piece 91 limits the rotation of the rotating pin shaft, so that the side support piece 6 and the seat frame 10 rotate downward synchronously, and the side support piece 6 is connected to the side support rod 5 through the joint pivot 4, so that the side support rod 5 rotates upward, thereby realizing the front wheel assembly frame 1 and the handle frame 3 to move closer to the rear wheel assembly frame 2 and fold together. During this folding and folding process, the seat frame 10 also follows the side support rod 5 to fold and fold; when the baby stroller frame is unfolded, the linkage mechanism 9 performs the opposite execution action, which is not repeated here.

[0051] In this specific implementation mode, Figure 3 and Figure 4 As shown, a pivot hole 3 63 is provided at the end of the side support piece 6 away from the joint hub 1 4, and a pivot hole 2 62 is provided on the side support piece 6. The pivot hole 2 62 is rotatably connected to the pivot part 1 900, and the tail end of the pivot part 1 900 is rotatably connected to the end of the seat frame 10; the pivot hole 3 63 is rotatably connected to the seat frame 10 through a rotating pin; when the linkage mechanism 9 of the present application drives the side support piece 6 to rotate, the pivot hole 2 62 and the fixed piece 90 form a constant rotation point position, so that the two ends of the side support piece 6 can rotate and swing along the constant rotation point position of the pivot hole 2 62, and when the baby stroller frame is folded, a movable rotation point position is formed between the pivot hole 3 63 and the seat frame 10, so that when the transmission piece 91 rotates and swings along the constant pivot part 2 901, the movable rotation point position between the pivot hole 3 63 and the seat frame 10 can limit sliding along the arc guide hole 912, so as to realize the synchronous folding action of the front wheel assembly frame 1, the handle frame 3 and the seat frame 10.

[0052] In this specific implementation mode, Figure 3 and Figure 4 As shown, a guide groove 902 is provided on the fixing plate 90, and the guide groove 902 is slidably connected with the arc-shaped guide protrusion 913 on the transmission plate 91. When the transmission plate 91 rotates and swings along the constant pivot portion 901, the guide groove 902 and the guide protrusion 913 are adapted to guide and slide, so that the rotation stability of the transmission plate 91 can be ensured, thereby ensuring the stability of the folding of the baby stroller frame.

[0053] In this specific implementation mode, Figure 3 and Figure 4As shown, one end of the transmission plate 91 is provided with a pivot hole 4 910, and the pivot hole 4 910 is rotatably connected to the pivot part 2 901, and the other end of the transmission plate 91 is provided with a pivot hole 5 911, and the pivot hole 5 911 is rotatably connected to one end of the arc-shaped support plate 92 through a pin, and the other end of the arc-shaped support plate 92 is provided with a pivot hole 6 920, and the pivot hole 6 920 is rotatably connected to the handle frame 3 through a pin; wherein, when the baby stroller frame is in an unfolded state, the height of the pivot hole 5 911 from the ground is higher than the height of the pivot hole 4 910 from the ground; when the baby stroller frame is in a folded state, the height of the pivot hole 5 911 from the ground is lower than the height of the pivot hole 4 910 from the ground; during the folding or unfolding operation of the transmission plate 91, the transmission plate 91 can rotate and swing along the constant pivot part 2 901, so that the arc-shaped support plate 92 can drive the transmission plate 91 to rotate, and then drive the side support plate 6 to follow the rotation.

[0054] In this specific implementation mode, Figures 5 to 9 As shown, the unlocking mechanism 8 includes an unlocking flap 80 rotatably connected to the upper surface of the seat plate 11, and unlocking pull rods 81 of an integral structure are provided on both sides of the unlocking flap 80. The unlocking pull rod 81 passes through the seat plate 11 and is connected to the unlocking pin 82. The unlocking pin 82 is used to unlock or lock the rotating connection end between the side branch plate 6 and the joint pivot 2 7.

[0055] During the use of this application, if Figure 1 and Fig.10 As shown, when the baby stroller frame changes from the unfolded state to the folded state, the seat plate 11 is in a horizontal state, and the side support rod 5 is in a horizontal state with the side support piece 6. The operator can easily operate the unlocking mechanism 8 on the seat plate 11 with one hand to unlock the rotating connection end between the side support piece 6 and the joint pivot 2 7. The unlocked side support piece 6 can rotate along the joint pivot 2 7 so that the side support rod 5 drives the front wheel assembly 1 to fold in conjunction, which is easy to operate; conversely, when the baby stroller frame is in the unfolded state, the unlocking mechanism 8 locks the rotating connection end between the side support piece 6 and the joint pivot 2 7 to ensure that the baby stroller frame is unfolded stably.

[0056] The specific operation of the unlocking mechanism 8 is as follows: when the baby stroller frame is folded, the unlocking flap 80 can be rotated a certain angle along the seat plate 11, and the unlocking flap 80 pulls the unlocking pin 82 through the unlocking pull rod 81 to unlock the rotating connection end between the side support piece 6 and the joint hub 2 7; conversely, when the baby stroller frame is unfolded, the unlocking flap 80 will not exert a force on the unlocking pin 82 through the unlocking pull rod 81, so that the unlocking pin 82 can lock the rotating connection end between the side support piece 6 and the joint hub 2 7.

[0057] In this specific embodiment, a pivot hole 60 and a locking hole 61 are provided on the rotating connection end between the side support piece 6 and the joint pivot 2 7; wherein, when the baby stroller frame is in the unfolded state, the unlocking pin 82 is inserted and connected with the locking hole 61; when the baby stroller frame is in the folded state, the unlocking pull rod 81 drives the unlocking pin 82 to disengage from the locking hole 61, at this time, the pivot hole 1 60 is rotatably connected with the joint pivot 2 7 and the side support rod 5 through the pin shaft; one end of the connecting rod 83 is inserted on the joint pivot 2 7, and a sliding hole 830 is opened on the side wall of the connecting rod 83, and the L-shaped unlocking pin 82 is slidably connected in the sliding hole 830; a return spring 84 is provided at the end of the connecting rod 83, and the return spring 84 resists the unlocking pin 82 to be inserted into the locking hole 61.

[0058] When the baby stroller frame is folded and unlocked, the unlocking pull rod 81 can drive the unlocking pin 82 to slide along the sliding hole 830 on the connecting rod 83 until the unlocking pin 82 is disengaged from the locking hole 61. At this time, the side support piece 6 is only rotationally connected with the joint pivot 2 7 and the side support rod 5 at the position of the pivot hole 1 60, so that the side support piece 6 can rotate along the joint pivot 2 7 after being unlocked, so that the front wheel assembly can be folded as a whole, which is easy to operate.

[0059] When the baby stroller frame is in the unfolded state, the end of the connecting rod 83 can be connected to the unlocking pin 82 through the return spring 84. Under the elastic force of the return spring 84, the unlocking pin 82 is always inserted and connected with the locking hole 61 on the side support piece 6. At this time, the pivot hole 1 60 and the locking hole 61 are both inserted and connected, so that the side support piece 6 can no longer rotate along the joint pivot 2 7, thereby ensuring the stability of the baby stroller frame when unfolded.

[0060] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An improved folding baby carriage frame, comprising a front wheel frame (1), a rear wheel frame (2) and a handle frame (3), wherein the front wheel frame (1), the rear wheel frame (2) and the handle frame (3) are rotatably connected via a joint hinge (4), characterized in that: It also comprises a seat plate (11), the two sides of the seat plate (11) are respectively fixedly connected to side support rods (5), one end of the side support rod (5) is rotatably connected to the front wheel assembly frame (1), the middle position of the side support rod (5) is rotatably connected to one end of a side support plate (6) through a joint pivot 2 (7), and the other end of the side support plate (6) is respectively connected to the rear wheel assembly frame (2) and the handlebar frame (3) through a linkage mechanism (9); The seat plate (11) is provided with an unlocking mechanism (8), and the unlocking mechanism (8) is used to unlock or lock the rotating connection end between the side support plate (6) and the second joint hub (7); When the baby carriage frame is in an unfolded state, the side support rod (5) and the side support piece (6) are kept horizontally flush, and the rotational connection end between the side support piece (6) and the second joint pivot (7) is locked by the unlocking mechanism (8); When the baby carriage frame is in a folded state, the unlocking mechanism (8) is used to unlock the rotating connection end between the side support piece (6) and the second joint hub (7), and the side support rod (5) pulls the front wheel assembly frame (1) to move closer to and fold towards the rear wheel assembly frame (2), and the side support piece (6) pulls the handle frame (3) to move closer to and fold towards the rear wheel assembly frame (2) through the linkage mechanism (9).

2. The improved folding baby stroller frame according to claim 1, characterized in that: The side support piece (6) is connected to the U-shaped seat frame (10) through a linkage mechanism (9); Wherein, when the baby carriage frame is in an unfolded state, the side support piece (6) and the seat frame (10) are kept horizontal and flush; When the baby carriage frame is in a folded state, the side support pieces (6) pull the seat surround frame (10) toward the rear wheel assembly frame (2) through the linkage mechanism (9) to be folded.

3. The improved folding baby stroller frame according to claim 2, characterized in that: The linkage mechanism (9) comprises a fixing plate (90), a transmission plate (91) and an arc-shaped support plate (92); the fixing plate (90) is fixedly arranged on the rear wheel assembly frame (2); the top of the fixing plate (90) is rotatably connected to the side support plate (6) and the seat frame (10) through a first pivot portion (900); the bottom is rotatably connected to one end of the transmission plate (91) through a second pivot portion (901); the other end of the transmission plate (91) is rotatably connected to one end of the arc-shaped support plate (92); and the other end of the arc-shaped support plate (92) is rotatably connected to the handle frame (3); The transmission plate (91) is provided with an arc-shaped guide hole (912), and the rotating pin between the side support plate (6) and the seat frame (10) is slidably connected along the arc-shaped guide hole (912).

4. The improved folding baby stroller frame according to claim 3, characterized in that: The end of the side support piece (6) away from the joint pivot one (4) is provided with a pivot hole three (63), and the side support piece (6) is provided with a pivot hole two (62), and the pivot hole two (62) is rotatably connected to the pivot part one (900), and the tail end of the pivot part one (900) is rotatably connected to the end of the seat frame (10); the pivot hole three (63) is rotatably connected to the seat frame (10) through a rotating pin.

5. The improved folding baby stroller frame according to claim 3, characterized in that: The fixing plate (90) is provided with a guide groove (902), and the guide groove (902) is slidably connected with an arc-shaped guide protrusion (913) on the transmission plate (91).

6. The improved folding baby stroller frame according to claim 3, characterized in that: A fourth pivot hole (910) is provided at one end of the transmission plate (91), and the second pivot part (901) is rotatably connected in the fourth pivot hole (910); a fifth pivot hole (911) is provided at the other end of the transmission plate (91), and the fifth pivot hole (911) is rotatably connected to one end of the arc-shaped support plate (92) via a pin; a sixth pivot hole (920) is provided at the other end of the arc-shaped support plate (92), and the sixth pivot hole (920) is rotatably connected to the handle frame (3) via a pin; Wherein, when the baby carriage frame is in the unfolded state, the height of the pivot hole 5 (911) from the ground is higher than the height of the pivot hole 4 (910) from the ground; When the baby carriage frame is in a folded state, the height of the pivot hole five (911) from the ground is lower than the height of the pivot hole four (910) from the ground.

7. The improved folding baby stroller frame according to claim 1, characterized in that: The unlocking mechanism (8) includes an unlocking flap (80) rotatably connected to the upper surface of the seat plate (11), and unlocking pull rods (81) of an integral structure are provided on both sides of the unlocking flap (80). The unlocking pull rods (81) pass through the seat plate (11) and are connected to an unlocking pin (82). The unlocking pin (82) is used to unlock or lock the rotating connection end between the side branch plate (6) and the joint pivot 2 (7).

8. The improved folding baby stroller frame according to claim 7, characterized in that: A pivot hole 1 (60) and a lock hole (61) are provided on the rotation connection end between the side branch piece (6) and the joint pivot 2 (7); Wherein, when the baby carriage frame is in an unfolded state, the unlocking pin rod (82) is inserted and connected with the lock hole (61); When the baby carriage frame is in a folded state, the unlocking pull rod (81) drives the unlocking pin rod (82) to disengage from the locking hole (61). At this time, the first pivot hole (60) is rotatably connected with the second joint pivot (7) and the side support rod (5) through a pin shaft.

9. The improved folding baby stroller frame according to claim 8, characterized in that: One end of a connecting rod (83) is inserted on the joint pivot 2 (7), a sliding hole (830) is provided on the side wall of the connecting rod (83), and the L-shaped unlocking pin (82) is slidably connected in the sliding hole (830).

10. An improved folding baby stroller frame according to claim 9, characterized in that: A return spring (84) is provided at the end of the connecting rod (83), and the return spring (84) is inserted into and locks the lock hole (61) by contacting the unlocking pin rod (82).

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