A trolley structure

Abstract

The present invention discloses a stroller structure. A driving mechanism is provided between a lateral connecting member and a bottom support frame. The driving mechanism includes a first transmission member, a second transmission member, a first rotating disk, a first transmission rod, a second rotating disk, and a second transmission rod. A seat support base that can rotate forward or backward relative to the lateral connecting member to approach and fold towards the bottom support frame is further connected to the lateral connecting member. An abutting portion is provided on the seat support base, a first pushing portion is provided on the first transmission rod, and a second pushing portion is further provided on the second rotating disk. Moreover, a control assembly that can control the rotation and folding direction of the seat support base is provided between the seat support base and the bottom support frame. When the seat assembly faces forward, the control assembly controls the seat support base to rotate and fold forward, and when the seat assembly faces backward, the control assembly controls the seat support base to rotate and fold backward. The structure of the present invention is simple and the folding operation is convenient. Regardless of the orientation of the seat assembly, the stroller structure can be directly folded.

Description

Technical Field

[0001] The present invention relates to a trolley structure.

Background Art

[0002] In the prior art, the structures of foldable trolley structures are different from each other, and their folding principles are also different. However, many trolley structures are relatively complex and there is room for improvement.

[0003] Therefore, the present invention is precisely produced based on the above deficiencies.

Summary of the Invention

[0004] The object of the present invention is to overcome the deficiencies of the prior art and provide a trolley structure with a simple structure and convenient folding operation.

[0005] The present invention is achieved by the following technical solutions:

[0006] A cart structure includes a foldable bottom support frame 1, wherein the bottom support frame 1 includes a first support frame 11 and a second support frame 12 that can rotate relative to the first support frame 11, and the lower ends of the first support frame 11 and the second support frame 12 are both provided with wheels 13, and the bottom support frame 1 is also connected to a push rod assembly 2, and the push rod assembly 2 is rotatably connected to the bottom support frame 1 through a transverse connecting member 3 connected thereto, and a driving mechanism is also provided between the transverse connecting member 3 and the bottom support frame 1, which can drive the first support frame 11 and the second support frame 12 to fold together when the push rod assembly 2 is rotated and folded relative to the bottom support frame 1, and the driving mechanism includes The first support frame 11 is rotatably connected to a first transmission member 41 and the second transmission member 42 is rotatably connected to the second support frame 12, and the first transmission member 41 and the second transmission member 42 are rotatably connected. The driving mechanism also includes a first rotating disk 43 connected to the transverse connecting member 3 and capable of rotating with the transverse connecting member 3. A first transmission rod 44 is hinged on the first rotating disk 43 and deviates from its rotation axis position. The other end of the first transmission rod 44 is rotatably connected to the first transmission member 41. The transverse connecting member 3 is also connected to a second rotating disk 45 that can rotate relative to it, and the rotation direction of the second rotating disk 45 is opposite to that of the first rotating disk 43. A second transmission rod 46 is hinged on the second rotating disk 45 and deviates from its rotation axis position. The other end of the second transmission rod 46 is rotatably connected to the second transmission member 42. The transverse connecting member 3 is also connected to a seat support seat 5 that can be rotated forward or backward relative to it and folded close to the bottom support frame 1. The seat support seat 5 is connected to a seat assembly 6 that can be folded and can be rotated relative to the seat support seat 5 to achieve front and rear switching. The seat support seat 5 is provided with a supporting portion 51. The first transmission rod 44 is provided with a supporting portion 51 that can push the supporting portion 51 during the unfolding process of the push rod assembly 2 relative to the bottom support frame 1 to make the seat support seat 5 that is rotated forward and folded rotate backward. The second rotating disk 45 is also provided with a first pushing portion 44a which can push the abutting portion 51 during the unfolding process of the push rod assembly 2 relative to the bottom support frame 1, so that the seat support seat 5 which is rotated and folded backward can be rotated forward and unfolded. In addition, a control component which can control the rotation and folding direction of the seat support seat 5 when the cart structure is folded is provided between the seat support seat 5 and the bottom support frame 1. When the seat assembly 6 faces forward and the cart structure is folded, the control component controls the seat support seat 5 to rotate forward and fold. When the seat assembly 6 faces backward and the cart structure is folded, the control component controls the seat support seat 5 to rotate backward and fold.

[0007] The second support frame 12 includes a left support frame 121 and a right support frame 122, the control assembly includes a left arc groove 71 provided on the left support frame 121 and extending along the rotation direction of the push rod assembly 2, and a right arc groove 72 provided on the right support frame 122 and extending along the rotation direction of the push rod assembly 2. The seat support seat 5 is slidably connected with a left sliding pin 73 that can move in the left arc groove 71 and can abut against the groove wall of the left arc groove 71 to prevent the seat support seat 5 from rotating forward. The seat support seat 5 is also slidably connected with a right sliding pin 74 that can move in the right arc groove 72 and can abut against the groove wall of the right arc groove 72 to prevent the seat support seat 5 from rotating backward. The left sliding pin 73 is slidably connected with the seat support seat 5 and can move in the right arc groove 72 and can abut against the groove wall of the right arc groove 72 to prevent the seat support seat 5 from rotating backward. A left return spring 75 is provided between the pin 73 and the seat support seat 5, and a right return spring 76 is provided between the right sliding pin 74 and the seat support seat 5. The seat assembly 6 is provided with a makeshift groove 77 for the left sliding pin 73 or the right sliding pin 74 to enter. When the left sliding pin 73 enters the makeshift groove 77, the left sliding pin 73 disengages from the left arc groove 71 and the right sliding pin 74 is pressed into the right arc groove 72 by the seat assembly 6. When the seat assembly 6 rotates and reverses relative to the seat support seat 5 so that the right sliding pin 74 enters the makeshift groove 77, the right sliding pin 74 disengages from the right arc groove 72 and the left sliding pin 73 is pressed into the left arc groove 71 by the seat assembly 6.

[0008] The locking device of the cart structure includes a first locking mechanism 81 arranged between the push rod assembly 2 and the second support frame 12, and a second locking mechanism 82 is arranged between the seat support seat 5 and the first support frame 11, which is unlocked by the first locking mechanism 81 and can be unlocked in conjunction with the rotating push rod assembly 2 when the push rod assembly 2 rotates relative to the bottom support frame 1.

[0009] When the seat assembly 6 is facing forward, the center of gravity of the seat assembly 6 is located on the front side of the rotation axis of the push rod assembly 2, so that after the second locking mechanism 82 is unlocked, the seat support seat 5 and the seat assembly 6 can automatically rotate forward and approach the bottom support frame 1. When the seat assembly 6 is facing backward, the center of gravity of the seat assembly 6 is located on the rear side of the rotation axis of the push rod assembly 2, so that after the second locking mechanism 82 is unlocked, the seat support seat 5 and the seat assembly 6 can automatically rotate backward and approach the bottom support frame 1.

[0010] The first locking mechanism 81 includes a plurality of inner locking grooves 811 arranged at the upper end of the second support frame 12 along the circumferential direction and a plurality of outer locking grooves 812 arranged at the lower end of the push rod assembly 2 along the circumferential direction. A first spline 813 capable of laterally moving therein and engaging with both the inner locking grooves 811 and the outer locking grooves 812 is provided in the space formed by the second support frame 12 and the push rod assembly 2. A first pushing member 814 capable of pushing the first spline 813 to move laterally so that the first spline 813 disengages from the outer locking groove 812 is further provided in the push rod assembly 2. A first return spring 815 capable of pushing the first spline 813 to reset is further provided between the second support frame 12 and the first spline 813.

[0011] The second locking mechanism 82 includes a plurality of inner engaging grooves 821 arranged at the seat support base 5 along the circumferential direction and a plurality of outer engaging grooves 822 arranged at the upper end of the first support frame 11 along the circumferential direction. A second spline 823 capable of sliding therein and engaging with both the outer engaging grooves 822 and the inner engaging grooves 821 is provided in the space formed by the first support frame 11 and the seat support base 5. A second pushing member 824 capable of pushing the second spline 823 to disengage from the outer engaging groove 822 when the lateral connecting member 3 rotates and folds relative to the bottom support frame 1 with the push rod assembly 2 is provided on the lateral connecting member 3. A second return spring 825 capable of pushing the second spline 823 to reset is further provided between the seat support base 5 and the second spline 823. The second pushing member 824 includes a second pushing block 8241 that abuts against the second spline 823 and can slide along the lateral connecting member 3. A groove 8242 with an inclined surface is provided on the second pushing block 8241. A rotating seat 8243 capable of rotating with the lateral connecting member 3 is further provided on the lateral connecting member 3. A protruding portion 8244 that cooperates with the groove 8242 and can push the second pushing block 8241 to slide laterally when the rotating seat 8243 rotates is provided on the rotating seat 8243.

[0012] The push rod assembly 2 includes a lower push rod 21 having a bent portion 21a and an upper push rod 22 capable of sliding in the lower push rod 21. The lateral connecting member 3 is connected to the lower push rod 21. The first pushing member 814 includes a first pushing block 8141 that abuts against the first spline 813 and can slide along the lateral connecting member 3. An inclined push rod 8142 that is inclined and can push the first pushing block 8141 to move laterally is provided in the bent portion 21a. A push rod 8143 capable of pushing the inclined push rod 8142 to slide when the upper push rod 22 retracts into the lower push rod 21 is provided on the upper push rod 22.

[0013] A handle 91 capable of being pulled out to lift the trolley structure when the trolley structure is in a folded state is further provided on the seat assembly 6. A third return spring 92 is further provided between the handle 91 and the seat assembly 6.

[0014] The described first support frame 11, second support frame 12, push rod assembly 2 and seat support base 5 are rotatably connected about the same axis.

[0015] The lower end of the first transmission rod 44 is hinged to the middle of the first transmission member 41, and the lower end of the second transmission rod 46 is hinged to the middle of the second transmission member 45.

[0016] Compared with the prior art, the present invention has the following advantages: When the cart structure of the present invention is folded, the push rod assembly is rotated forward, and the push rod assembly and the transverse connecting member thereon rotate relative to the bottom support frame together. During this process, the first rotating disc rotates with the transverse connecting member, and the first rotating disc pushes the first transmission rod, and the first transmission rod pushes the first transmission member to rotate relative to the first support frame. The first transmission member pulls the second transmission member rotatably connected thereto, and the second transmission member pulls the second support frame, so as to realize the relative rotation and approximation of the first support frame and the second support frame. During the process of the second transmission member pulling the second support frame, the second transmission member rotates relative to the second support frame, and the second transmission rod will pull the second rotating disc to rotate backward. During the whole process, the folding operation is convenient and smooth, and the setting of the second rotating disc and the second transmission rod can make the cart structure stable in the unfolded state and fold smoothly during the folding process. In addition, the control component can control the seat support base to rotate forward or backward for folding. When the seat component faces forward, the control component controls the seat support base to drive the seat component to rotate forward for folding, and when the seat component faces backward, the control component controls the seat support base to drive the seat component to rotate backward for folding. Therefore, regardless of the orientation of the seat component, the entire cart structure can be directly folded without adjusting the orientation of the seat component, making the folding operation very convenient. Moreover, when the cart structure needs to be unfolded, during the rotation of the push rod assembly, the first pushing portion on the first transmission rod can push the abutting portion on the seat support base to make the seat support base that rotates forward for folding rotate backward automatically, or the second pushing portion on the second rotating disc pushes the abutting portion on the seat support base to make the seat support base that rotates backward rotate forward automatically, making the unfolding of the entire cart structure convenient and eliminating the need to manually operate the rotation of the seat support base by moving the seat component.

Description of the Drawings

[0017] Figure 1 is a perspective view of the present invention;

[0018] Figure 2 is a side view of the unfolded state when the seat component of the present invention faces forward;

[0019] Figure 3 is a side view of the unfolded state when the seat component of the present invention faces backward;

[0020] Figure 4Is a perspective view of the present invention after removing the seat assembly;

[0021] Figure 5 Is a side view of the present invention after removing the seat assembly;

[0022] Figure 6 Is a side view during the folding process of the present invention after removing the seat assembly;

[0023] Figure 7 Is a folding schematic diagram of the present invention when the seat support rotates forward for folding;

[0024] Figure 8 Is a folding schematic diagram of the present invention when the seat support rotates backward for folding;

[0025] Figure 9 Is one of the exploded views of the components of the present invention;

[0026] Figure 10 Is another exploded view of the components of the present invention;

[0027] Figure 11 Is a third exploded view of the components of the present invention;

[0028] Figure 12 Is a fourth exploded view of the components of the present invention;

[0029] Figure 13 Is one of the partial cross-sectional views of the present invention;

[0030] Figure 14 Is another partial cross-sectional view of the present invention;

[0031] Figure 15 Is a third partial cross-sectional view of the present invention;

[0032] Figure 16 Is a bottom view of the seat assembly of the present invention;

[0033] Figure 17 Is a schematic diagram of the state of the right sliding pin when the seat assembly of the present invention faces forward;

[0034] Figure 18 Is a schematic diagram of the state of the left sliding pin when the seat assembly of the present invention faces forward;

[0035] Figure 19 Is a schematic diagram of the state of the right sliding pin when the seat assembly of the present invention faces backward;

[0036] Figure 20 Is a schematic diagram of the state of the left sliding pin when the seat assembly of the present invention faces backward;

[0037] Figure 21 Is a perspective view of the components of the seat assembly of the present invention.

Detailed Implementation Manner

[0038] The present invention will be further described below with reference to the accompanying drawings:

[0039] As Figures 1 to 15 shown, a trolley structure includes a foldable bottom support frame 1. The bottom support frame 1 includes a first support frame 11 and a second support frame 12 that can rotate relative to the first support frame 11. Wheels 13 are provided at the lower ends of both the first support frame 11 and the second support frame 12. A push rod assembly 2 is further connected to the bottom support frame 1. The push rod assembly 2 is rotatably connected to the bottom support frame 1 through a transverse connecting member 3 connected thereto. A driving mechanism is further provided between the transverse connecting member 3 and the bottom support frame 1, which can drive the first support frame 11 and the second support frame 12 to approach and fold when the push rod assembly 2 rotates and folds relative to the bottom support frame 1. The driving mechanism includes a first transmission member 41 rotatably connected to the first support frame 11 and a second transmission member 42 rotatably connected to the second support frame 12, and the first transmission member 41 and the second transmission member 42 are rotatably connected. The driving mechanism further includes a first rotating disk 43 connected to the transverse connecting member 3 and capable of rotating with the transverse connecting member 3. A first transmission rod 44 is hinged at a position deviating from the rotation axis of the first rotating disk 43. The other end of the first transmission rod 44 is rotatably connected to the first transmission member 41. A second rotating disk 45 capable of rotating relative to it is further connected to the transverse connecting member 3, and the rotation direction of the second rotating disk 45 is opposite to the rotation direction of the first rotating disk 43. A second transmission rod 46 is hinged at a position deviating from the rotation axis of the second rotating disk 45. The other end of the second transmission rod 46 is rotatably connected to the second transmission member 42. When the trolley structure is folded, the push rod assembly 2 is rotated forward, and the push rod assembly 2 and the transverse connecting member 3 thereon rotate relative to the bottom support frame 1 together. During this process, the first rotating disk 43 rotates with the transverse connecting member 3. The first rotating disk 43 then pushes the first transmission rod 44, and the first transmission rod 44 pushes the first transmission member 41 to rotate relative to the first support frame 11. The first transmission member 41 pulls the second transmission member 42 rotatably connected to it, and the second transmission member 42 pulls the second support frame 12 and rotates relative to the second support frame 12. During this process, the second transmission rod 46 will pull the second rotating disk 45 to rotate backward, finally realizing the relative rotation and approaching of the first support frame 11 and the second support frame 12, and realizing the folding of the trolley structure. The entire trolley structure has a simple structure and convenient folding operation. Just rotating the push rod assembly 2 to approach the first support frame 11 can realize the approaching of the first support frame 11 and the second support frame 12. Moreover, the entire driving mechanism makes the unfolded state of the trolley structure stable, and the relative rotation and approaching movement of the first support frame 11 and the second support frame 12 is smooth during the folding process.

[0040] As Figures 13 to 15As shown, the lower end of the first transmission rod 44 is hinged to the middle of the first transmission member 41, and the lower end of the second transmission rod 46 is hinged to the middle of the second transmission member 45, so that the cart structure can be folded smoothly and the unfolded state is stable and reliable.

[0041] like Figures 1 to 12 As shown, the first support frame 11, the second support frame 12, the push rod assembly 2 and the seat support base 5 are rotatably connected around the same axis, so that the entire cart structure is simple and compact.

[0042] like Figures 1 to 15 As shown, the transverse connecting member 3 is also connected to a seat support seat 5 which can be rotated forward or backward relative to the seat support seat 3 and folded toward the bottom support frame 1; the seat support seat 5 is connected to a seat assembly 6 which is foldable and can be rotated relative to the seat support seat 5 to achieve front and rear switching; the seat support seat 5 is provided with a supporting portion 51, and the supporting portion 51 is a horizontal axis fixed to the seat support seat 5; the first transmission rod 44 is provided with a first pushing portion 44a which can push the supporting portion 51 during the unfolding process of the push rod assembly 2 relative to the bottom support frame 1 so that the seat support seat 5 that is rotated forward and folded can be rotated backward and unfolded; the second rotating disk 45 is also provided with a second pushing portion 45a which can push the supporting portion 51 during the unfolding process of the push rod assembly 2 relative to the bottom support frame 1 so that the seat support seat 5 that is rotated backward and folded can be rotated forward and unfolded. When the seat assembly 6 faces forward and the stroller structure is folded, the seat support seat 5 rotates forward with the folded seat assembly 6 and approaches the first support frame 11. At this time, during the unfolding of the stroller structure, the push rod assembly 2 rotates relative to the bottom support frame 1, pulls the first transmission rod 44 through the first rotating disk 43, and then pulls the first transmission member 41 and pushes the second transmission member 42 through the first transmission member 41, thereby realizing the relative unfolding of the first support frame 11 and the second support frame 12. During this process, the second transmission rod 46 pushes the second rotating disk 45 to rotate in the opposite direction of the first rotating disk 43, and the first pushing portion 44a on the first transmission rod 44 will touch the abutment portion 51 on the pushing seat support seat 5, thereby pushing the seat support seat 5 to rotate relative to the transverse connecting member 3, so that the push rod assembly 2 makes the seat support seat 5 automatically rotate and unfold during the rotation and unfolding process. Similarly, when the seat assembly 6 faces backward and the stroller structure needs to be unfolded after being folded, the push rod assembly 2 is unfolded, and the second push portion 45a on the second rotating disk 45 pushes the abutment portion 51 during the rotation process, so that the seat support base 5 automatically rotates and unfolds. The foldable seat assembly 6 can adopt a seat assembly of a conventional folding structure, which will not be described in detail here, and when the entire stroller structure is folded, the seat assembly 6 is folded first, and then the push rod assembly 2 is rotated to achieve further folding.

[0043] like Figures 9 to 12 ,as well asFigures 17 to 20 As shown, a control component is provided between the seat support base 5 and the bottom support frame 1, which can control the rotation and folding direction of the seat support base 5 when the stroller structure is folded. When the seat assembly 6 faces forward and the stroller structure is folded, the control component controls the seat support base 5 to rotate forward and fold. When the seat assembly 6 faces backward and the stroller structure is folded, the control component controls the seat support base 5 to rotate backward and fold. Therefore, when the stroller structure is folded, regardless of the orientation of the seat assembly 6, after the seat assembly 6 is folded, the control component can control the seat support base 5 to rotate in a set direction, so that the seat support base 5 drives the seat assembly 6 to rotate and fold, avoiding the need to adjust the seat assembly to face forward when the traditional baby stroller is folded, making the folding operation more convenient and fast.

[0044] As Figures 9 to 12 , and Figures 17 to 20As shown, the second support frame 12 includes a left support 121 and a right support 122. The control assembly 7 includes a left arc-shaped groove 71 provided on the left support 121 and extending along the rotation direction of the push rod assembly 2, and a right arc-shaped groove 72 provided on the right support 122 and extending along the rotation direction of the push rod assembly 2. A left sliding pin 73 that can move within the left arc-shaped groove 71 and abut against the groove wall of the left arc-shaped groove 71 to prevent the seat support 5 from rotating forward is slidably connected within the seat support 5. A right sliding pin 74 that can move within the right arc-shaped groove 72 and abut against the groove wall of the right arc-shaped groove 72 to prevent the seat support 5 from rotating backward is also slidably connected within the seat support 5. A left return spring 75 is provided between the left sliding pin 73 and the seat support 5, and a right return spring 76 is provided between the right sliding pin 74 and the seat support 5. A relief groove 77 into which the left sliding pin 73 or the right sliding pin 74 can enter is provided on the seat assembly 6. When the left sliding pin 73 enters the relief groove 77, the left sliding pin 73 disengages from the left arc-shaped groove 71 and the right sliding pin 74 is pressed by the seat assembly 6 into the right arc-shaped groove 72. When the seat assembly 6 rotates and changes direction relative to the seat support 5 such that the right sliding pin 74 enters the relief groove 77, the right sliding pin 74 disengages from the right arc-shaped groove 72 and the left sliding pin 73 is pressed by the seat assembly 6 into the left arc-shaped groove 71. When the seat assembly 6 faces forward, the adult pushing the stroller and the child within the seat assembly 6 face the same direction. At this time, the left sliding pin 73 disengages from the left arc-shaped groove 71 and the right sliding pin 74 falls into the right arc-shaped groove 72. At this time, the groove wall of the left arc-shaped groove 71 cannot block the left sliding pin 73, and the groove wall of the right arc-shaped groove 72 can block the right sliding pin 74. At this time, the control assembly can prevent the seat support 5 from rotating backward and ensure that the seat support 5 can only rotate forward. When the stroller structure is folded, the seat support 5 rotates forward, and the right sliding pin 74 moves within the right arc-shaped groove 72 along the extension direction of the right arc-shaped groove 72, causing the seat assembly 6 to move forward and close to the first support frame 11. When the seat assembly 6 is rotated so that the seat assembly 6 faces backward, at this time, the adult pushing the stroller and the child within the seat assembly 6 face each other. Because the seat assembly 6 rotates relative to the seat support 5, the relief groove 77 originally cooperating with the left sliding pin 73 moves to a position cooperating with the right sliding pin 74. At this time, the left sliding pin 73 is pressed into the left arc-shaped groove 71, and the right sliding pin 74 is pushed by the right return spring 76 and disengages from the right arc-shaped groove 72. At this time, the groove wall of the left arc-shaped groove 71 can resist the left sliding pin 73, thereby preventing the seat support 5 from rotating forward. Therefore, when the stroller structure is folded, the seat support 5 can only rotate backward, causing the seat assembly 6 to move backward and close to the second support frame 12.Therefore, when the stroller structure is folded, the control component automatically controls the rotation direction of the seat support 5 according to the orientation of the seat component 6, avoiding the defect that the seat component of traditional child strollers needs to be adjusted to face forward before folding, making the folding operation more convenient and quick.

[0045] like Figures 9 to 12 As shown, the locking device of the stroller structure includes a first locking mechanism 81 disposed between the push rod assembly 2 and the second support frame 12, and a second locking mechanism 82 is disposed between the seat support seat 5 and the first support frame 11, which can be unlocked by the rotating push rod assembly 2 when the first locking mechanism 81 is unlocked and the push rod assembly 2 rotates relative to the bottom support frame 1. When the stroller structure is folded, the first locking mechanism 81 is first unlocked and then the push rod assembly 2 is rotated forward, and the push rod assembly 2 will unlock the second locking mechanism 82 during the rotation process, realizing linkage unlocking, making the folding operation more convenient.

[0046] like Figure 2 and Figure 3 As shown, when the seat assembly 6 faces forward, the center of gravity of the seat assembly 6 is located in front of the rotation axis of the push rod assembly 2, so that after the second locking mechanism 82 is unlocked, the seat support seat 5 and the seat assembly 6 can automatically rotate forward and close to the bottom support frame 1. When the seat assembly 6 faces backward, the center of gravity of the seat assembly 6 is located in the rear of the rotation axis of the push rod assembly 2, so that after the second locking mechanism 82 is unlocked, the seat support seat 5 and the seat assembly 6 can automatically rotate backward and close to the bottom support frame 1. Therefore, once the second locking mechanism 82 is unlocked, the seat support seat 5 can rotate automatically, and the seat support seat 5 can be rotated and folded without pushing the seat assembly 6, making the frame folding operation simple and quick.

[0047] like Figures 9 to 12As shown, the first locking mechanism 81 includes a plurality of inner locking grooves 811 provided at the upper end of the second support frame 12 and arranged circumferentially, and a plurality of outer locking grooves 812 provided at the lower end of the push rod assembly 2 and arranged circumferentially. A first spline 813 capable of laterally moving therein and engaging with both the inner locking grooves 811 and the outer locking grooves 812 is provided in the space formed by the second support frame 12 and the push rod assembly 2. A first pushing member 814 capable of pushing the first spline 813 to move laterally so that the first spline 813 disengages from the outer locking grooves 812 is further provided in the push rod assembly 2. A first return spring 815 capable of pushing the first spline 813 to reset is further provided between the second support frame 12 and the first spline 813. The push rod assembly 2 includes a lower push rod 21 having a bent portion 21a and an upper push rod 22 capable of sliding in the lower push rod 21. The lateral connecting member 3 is connected to the lower push rod 21. The first pushing member 814 includes a first pushing block 8141 that abuts against the first spline 813 and can slide along the lateral connecting member 3. An inclined push rod 8142 capable of pushing the first pushing block 8141 to move laterally is provided in the bent portion 21a. A push rod 8143 capable of pushing the inclined push rod 8142 to slide when the upper push rod 22 retracts into the lower push rod 21 is provided on the upper push rod 22. The second locking mechanism 82 includes a plurality of inner engaging grooves 821 provided on the seat support base 5 and arranged circumferentially, and a plurality of outer engaging grooves 822 provided at the upper end of the first support frame 11 and arranged circumferentially. A second spline 823 capable of sliding therein and engaging with both the outer engaging grooves 822 and the inner engaging grooves 821 is provided in the space formed by the first support frame 11 and the seat support base 5. A second pushing member 824 capable of pushing the second spline 823 to disengage from the outer engaging grooves 822 when the lateral connecting member 3 rotates and folds relative to the bottom support frame 1 is provided on the lateral connecting member 3. A second return spring 825 capable of pushing the second spline 823 to reset is further provided between the seat support base 5 and the second spline 823. The second pushing member 824 includes a second pushing block 8241 that abuts against the second spline 823 and can slide along the lateral connecting member 3. A groove 8242 with an inclined surface is provided on the second pushing block 8241. A rotating seat 8243 capable of rotating with the lateral connecting member 3 is further provided on the lateral connecting member 3. A protruding portion 8244 that cooperates with the groove 8242 and can push the second pushing block 8241 to slide laterally when the rotating seat 8243 rotates is provided on the rotating seat 8243.When the stroller structure needs to be folded, push the upper push rod 22 downward. The push rod 8143 will push the inclined push rod 8142. The inclined push rod 8142 will push the first push block 8141. The first push block 8141 will push the first spline 813, causing the first spline 813 to move horizontally and disengage from the outer locking groove 812 on the push rod assembly 2. At this time, the first return spring 815 is compressed and the first locking mechanism 81 is unlocked. At this time, the push rod assembly 2 can be rotated forward. During the rotation of the push rod assembly 2, the first support frame 11 and the second support frame 12 are brought closer together through the drive mechanism. And during the rotation of the push rod assembly 2, the rotating seat 8243 is driven to rotate. The protruding portion 8244 on the rotating seat 8243 will push the inclined surface of the groove 8242 on the second push block 8241, thereby causing the second push block 8241 to move horizontally. The second push block 8241 will push the second spline 823 to disengage from the outer engagement groove 822 on the first support frame 11. At this time, the second locking mechanism 82 is unlocked. The seat support base 5 will drive the seat assembly 6 to rotate and fold in a set direction under the action of the control assembly. Therefore, when folding the entire stroller structure, only need to push the upper push rod 22 downward and rotate the push rod assembly 2 forward to achieve the folding of the entire vehicle frame, and the operation is very convenient and fast.

[0048] As Figure 21 shown, a handle 91 for lifting the stroller structure that can be pulled out when the stroller structure is in a folded state is further provided on the seat assembly 6. A third return spring 92 is further provided between the handle 91 and the seat assembly 6. When the baby stroller is in a folded state, the handle 91 can be pulled outwards for the user to lift the baby stroller or pull the baby stroller in a folded state. When the baby stroller does not need to be carried or pulled, under the action of the third return spring 92, the handle 91 is retracted into the seat assembly 6 again.

Claims

1. A trolley structure, comprising a foldable bottom support frame (1), the bottom support frame (1) including a first support frame (11) and a second support frame (12) capable of rotating relative to the first support frame (11), wheels (13) being provided at the lower ends of both the first support frame (11) and the second support frame (12), and a push rod assembly (2) being further connected to the bottom support frame (1), characterized in that: The described push rod assembly (2) is rotatably connected to the bottom support frame (1) through a lateral connecting member (3) connected thereto. A driving mechanism is further provided between the lateral connecting member (3) and the bottom support frame (1) that can drive the first support frame (11) and the second support frame (12) to approach and fold when the push rod assembly (2) rotates and folds relative to the bottom support frame (1). The driving mechanism includes a first transmission member (41) rotatably connected to the first support frame (11) and a second transmission member (42) rotatably connected to the second support frame (12), and the first transmission member (41) and the second transmission member (42) are rotatably connected. The driving mechanism further includes a first rotating disk (43) connected to the lateral connecting member (3) and capable of rotating with the lateral connecting member (3). A first transmission rod (44) is hinged at a position deviating from the rotation axis of the first rotating disk (43). The other end of the first transmission rod (44) is rotatably connected to the first transmission member (41). A second rotating disk (45) capable of rotating relative to the lateral connecting member (3) is further connected to the lateral connecting member (3), and the rotation direction of the second rotating disk (45) is opposite to that of the first rotating disk (43). A second transmission rod (46) is hinged at a position deviating from the rotation axis of the second rotating disk (45). The other end of the second transmission rod (46) is rotatably connected to the second transmission member (42). A seat support base (5) capable of rotating forward or backward relative to the lateral connecting member (3) and approaching and folding towards the bottom support frame (1) is further connected to the lateral connecting member (3). A seat assembly (6) that can be folded and can rotate relative to the seat support base (5) to achieve front-back commutation is connected to the seat support base (5). An abutting portion (51) is provided on the seat support base (5). A first pushing portion (44a) capable of pushing the abutting portion (51) during the unfolding process of the push rod assembly (2) relative to the bottom support frame (1) so that the seat support base (5) that rotates and folds forward rotates backward and unfolds is provided on the first transmission rod (44). A second pushing portion (45a) capable of pushing the abutting portion (51) during the unfolding process of the push rod assembly (2) relative to the bottom support frame (1) so that the seat support base (5) that rotates and folds backward rotates forward and unfolds is further provided on the second rotating disk (45). Moreover, a control assembly for controlling the rotation and folding direction of the seat support base (5) when the cart structure folds is provided between the seat support base (5) and the bottom support frame (1). When the seat assembly (6) faces forward and the cart structure folds, the control assembly controls the seat support base (5) to rotate and fold forward. When the seat assembly (6) faces backward and the cart structure folds, the control assembly controls the seat support base (5) to rotate and fold backward.

2. The trolley structure according to claim 1, wherein: The second support frame (12) comprises a left support frame (121) and a right support frame (122); the control assembly comprises a left arc-shaped groove (71) provided on the left support frame (121) and extending along the rotation direction of the push rod assembly (2); and a right arc-shaped groove (72) provided on the right support frame (122) and extending along the rotation direction of the push rod assembly (2); a left sliding pin (73) is slidably connected in the seat support seat (5) and can move in the left arc-shaped groove (71) and can abut against the groove wall of the left arc-shaped groove (71) to prevent the seat support seat (5) from rotating forward; a right sliding pin (74) is slidably connected in the seat support seat (5) and can move in the right arc-shaped groove (72) and can abut against the groove wall of the right arc-shaped groove (72) to prevent the seat support seat (5) from rotating backward; the left sliding pin (73) and the seat support seat (5) are slidably connected in the seat support seat (5) and can move in the right arc-shaped groove (72) and can abut against the groove wall of the right arc-shaped groove (72) to prevent the seat support seat (5) from rotating backward. A left return spring (75) is provided between the seat support seat (5), a right return spring (76) is provided between the right sliding pin (74) and the seat support seat (5), and a clearance groove (77) is provided on the seat assembly (6) for the left sliding pin (73) or the right sliding pin (74) to enter. When the left sliding pin (73) enters the clearance groove (77), the left sliding pin (73) is disengaged from the left arc-shaped groove (71) and the right sliding pin (74) is pressed into the right arc-shaped groove (72) by the seat assembly (6). When the seat assembly (6) rotates and reverses relative to the seat support seat (5) so that the right sliding pin (74) enters the clearance groove (77), the right sliding pin (74) is disengaged from the right arc-shaped groove (72) and the left sliding pin (73) is pressed into the left arc-shaped groove (71) by the seat assembly (6).

3. The trolley structure according to claim 1 or 2, characterized in that: The locking device of the cart structure comprises a first locking mechanism (81) arranged between the push rod assembly (2) and the second support frame (12); and a second locking mechanism (82) is arranged between the seat support seat (5) and the first support frame (11) and can be unlocked in conjunction with the rotating push rod assembly (2) when the first locking mechanism (81) is unlocked and the push rod assembly (2) rotates relative to the bottom support frame (1).

4. The trolley structure according to claim 3, characterized in that: When the seat assembly (6) faces forward, the center of gravity of the seat assembly (6) is located on the front side of the rotation axis of the push rod assembly (2), so that after the second locking mechanism (82) is unlocked, the seat support seat (5) and the seat assembly (6) can automatically rotate forward and approach the bottom support frame (1); when the seat assembly (6) faces backward, the center of gravity of the seat assembly (6) is located on the rear side of the rotation axis of the push rod assembly (2), so that after the second locking mechanism (82) is unlocked, the seat support seat (5) and the seat assembly (6) can automatically rotate backward and approach the bottom support frame (1).

5. The trolley structure according to claim 4, characterized in that: The described first locking mechanism (81) includes a plurality of inner locking grooves (811) provided at the upper end of the second support frame (12) and arranged circumferentially, and a plurality of outer locking grooves (812) provided at the lower end of the push rod assembly (2) and arranged circumferentially. Inside the space formed by the second support frame (12) and the push rod assembly (2), there is a first spline (813) that can move laterally therein and engage with both the inner locking grooves (811) and the outer locking grooves (812) simultaneously. Inside the push rod assembly (2), there is also a first pushing member (814) that can push the first spline (813) to move laterally so that the first spline (813) disengages from the outer locking grooves (812). Between the second support frame (12) and the first spline (813), there is also a first return spring (815) that can push the first spline (813) to reset.

6. The trolley structure according to claim 5, characterized in that: The described second locking mechanism (82) includes a plurality of inner engaging grooves (821) provided on the seat support base (5) and arranged circumferentially, and a plurality of outer engaging grooves (822) provided at the upper end of the first support frame (11) and arranged circumferentially. Inside the space formed by the first support frame (11) and the seat support base (5), there is a second spline (823) that can slide therein and engage with both the outer engaging grooves (822) and the inner engaging grooves (821) simultaneously. On the lateral connecting member (3), there is a second pushing member (824) that can push the second spline (823) to disengage from the outer engaging grooves (822) when the lateral connecting member (3) rotates and folds relative to the bottom support frame (1) with the push rod assembly (2). Between the seat support base (5) and the second spline (823), there is also a second return spring (825) that can push the second spline (823) to reset. The second pushing member (824) includes a second pushing block (8241) that abuts against the second spline (823) and can slide along the lateral connecting member (3). On the second pushing block (8241), there is a groove (8242) with an inclined surface. On the lateral connecting member (3), there is also a rotating seat (8243) that can rotate with it. On the rotating seat (8243), there is a protruding portion (8244) that cooperates with the groove (8242) and can push the second pushing block (8241) to slide laterally when the rotating seat (8243) rotates.

7. The trolley structure according to claim 6, characterized in that: The push rod assembly (2) includes a lower push rod (21) having a bent portion (21a) and an upper push rod (22) that can slide inside the lower push rod (21). The lateral connecting member (3) is connected to the lower push rod (21). The first pushing member (814) includes a first pushing block (8141) that abuts against the first spline (813) and can slide along the lateral connecting member (3). Inside the bent portion (21a), there is an inclined oblique push rod (8142) that can push the first pushing block (8141) to move laterally. On the upper push rod (22), there is a push rod (8143) that can push the oblique push rod (8142) to slide when the upper push rod (22) retracts into the lower push rod (21).

8. The trolley structure according to claim 1, characterized in that: The seat assembly (6) is further provided with a handle (91) that can be pulled out when the trolley structure is in a folded state for lifting the trolley structure, and a third return spring (92) is further provided between the handle (91) and the seat assembly (6).

9. The trolley structure according to claim 1, wherein: The first support frame (11), the second support frame (12), the push rod assembly (2) and the seat support base (5) are rotatably connected about the same axis.

10. The trolley structure according to claim 1, wherein: The lower end of the first transmission rod (44) is hinged to the middle of the first transmission member (41), and the lower end of the second transmission rod (46) is hinged to the middle of the second transmission member (42).

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