A cart

Abstract

The present invention discloses a stroller, wherein an upper support frame is connected to the upper support frame, a seat support is connected to the upper support frame, a seat is provided on the seat support, a locking device is provided between the seat support and the upper support frame, a push rod assembly is further connected to the seat support that can drive the push rod assembly to rotate in a horizontal direction, and the push rod assembly is rotatably connected to both sides of the seat support so that the push rod assembly can stay in positions including a pushing position for pushing the stroller and a vertical position for driving the seat support to rotate in a horizontal direction, a locking device is provided between the push rod assembly and the seat support that can keep the push rod assembly in the pushing position when locked, and a control assembly is further provided between the seat support and the push rod assembly that can lock the push rod assembly in the vertical position when the push rod assembly drives the seat to reverse forward and backward and ensure that the push rod assembly can only be rotated back to the pushing position when the seat reversal is completed. The present invention is easy to operate and safe and reliable.

Description

Technical field

[0001] The present invention relates to a cart. [Background Technology]

[0002] Strollers have become an indispensable part of infants' and young children's growth. Currently, most strollers on the market offer reversible seats, allowing children to face backward or forward, respectively. However, traditional seat reversal requires reaching under the seat to operate, which is inconvenient and requires bending over and reaching under the seat to feel around.

[0003] Therefore, the present invention is just based on above deficiency and produces. [Summary of the invention]

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a cart with a simple structure, convenient operation, safety and reliability.

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

[0006] The trolley comprises a bottom support frame with front and rear wheels, an upper support frame being connected to the upper support frame, a seat support being connected to the upper support frame and being able to rotate relative to the bottom support frame in a horizontal plane, a seat being provided on the seat support frame for seating, a locking device being provided between the seat support frame and the upper support frame and being able to lock the two. The seat support is also connected to a push rod assembly which can drive the seat to rotate in the horizontal plane direction to realize the front and rear direction switching of the seat, and the push rod assembly is rotatably connected to the seat support at both sides so that the positions in which the push rod assembly can stay include a pushing position for pushing the trolley and a vertical position for driving the seat support to rotate in the horizontal plane direction. A locking device is provided between the push rod assembly and the seat support so that the push rod assembly can be kept in the pushing position when locked, and a control assembly is also provided between the seat support and the push rod assembly which can lock the push rod assembly in the vertical position when the push rod assembly drives the seat to switch back and forth and ensure that the push rod assembly can only be rotated back to the pushing position when the seat switching is completed.

[0007] The push rod assembly includes a first push rod and a second push rod, the lower end of the first push rod is connected to a first connecting seat that can rotate relative to the seat support member, the lower end of the second push rod is connected to a second connecting seat that can rotate relative to the seat support member, the control assembly includes a latch provided on one side of the upper support frame, the seat support member is provided with a first sliding member and a second sliding member that can slide therein and alternately engage with the latch when the seat is reversed, the first connecting seat is provided with a first abutting member that can slide therein and cooperate with the first sliding member, the second connecting seat is provided with a second abutting member that can slide therein and cooperate with the second sliding member, and in the process of reversing the seat forward and backward:

[0008] When the first sliding member is disengaged from the locking position, the second sliding member is engaged with the locking position, and the push rod assembly is in the vertical position, the first abutting member can abut against the first sliding member to prevent the push rod assembly in the vertical position from rotating forward and ensure that the push rod assembly in the vertical position can rotate backward to the pushing position;

[0009] When the first sliding member is disengaged from the locking position and the second sliding member is also disengaged from the locking position, the first abutting member abuts against the first sliding member and the second abutting member abuts against the second sliding member, thereby preventing the push rod assembly in the vertical position from rotating forward and backward;

[0010] When the first sliding member is engaged with the locking position, the second sliding member is disengaged from the locking position and the push rod assembly is in the vertical position, the second abutment member can abut against the second sliding member to prevent the push rod assembly in the vertical position from rotating forward and ensure that the push rod assembly in the vertical position can rotate backward to the pushing position.

[0011] The first sliding member comprises a first sliding rod that is capable of sliding within the seat support, and a first locking portion that can be engaged with the locking position at one end of the first sliding rod, and a first connecting seat that is connected to the first connecting seat and can follow the first sliding shaft to slide relative to the seat support and pass through the first connecting seat, and a first return spring that can push the first sliding rod to return to its original position relative to the seat support is provided between the seat support and the first connecting seat, and a second return spring that can push the first sliding shaft to slide back to its original position relative to the first connecting seat is further provided between the first sliding shaft and the first connecting seat. The first abutting member comprises a first body that is provided in the first connecting seat, and a first abutting portion that protrudes and can abut against a side wall of the first sliding shaft is provided on the first body;

[0012] The second sliding member includes a second sliding rod that can slide in the seat support, and one end of the second sliding rod is provided with a second locking portion that can engage with the locking position, and the other end of the second sliding rod is provided with a second connecting seat. The second connecting seat is connected to the second sliding shaft that can follow it to slide relative to the seat support and pass through the second connecting seat, and the second sliding shaft and the second connecting seat are relatively slidably connected. A third return spring that can push the second sliding rod to return to the seat support relative to the seat support is provided between the seat support and the second connecting seat. A fourth return spring that can push the second sliding shaft to slide and return to the second connecting seat is also provided between the second sliding shaft and the second connecting seat. The second abutting member includes a second body provided in the second connecting seat, and a protruding second abutting portion is provided on the second body that can abut against the side wall of the second sliding shaft.

[0013] The bottom support frame includes a front support assembly and a rear support assembly that can rotate relative to the front support assembly. The position where the push rod assembly stays also includes a folding position that can be rotated forward and close to the front support assembly after the locking device is unlocked. The first abutment is slidably connected to the first connecting seat and a fifth return spring is provided therebetween to push the first abutment to slide and return. The second abutment is slidably connected to the second connecting seat and a sixth return spring is provided therebetween to push the second abutment to slide and return. The first push rod is provided with a first driving member that can push the first abutment to slide, and the second push rod is provided with a second driving member that can push the second abutment to slide. When the first driving member pushes the first abutment and the second driving member pushes the second abutment to slide, the first abutment and the first sliding shaft, as well as the second abutment and the second sliding shaft, are always in a disengaged state from each other so that the push rod assembly can rotate forward from the pushing position to the folding position.

[0014] The first push rod and the second push rod are connected to a retractable hand push rod, and the first driving member includes a first driving rod that can be pushed and slid by the hand push rod, and the lower end of the first driving rod is provided with a first inclined sliding surface, and the first body is provided with a first inclined surface that can cooperate with the first inclined sliding surface and can be pushed by the first inclined sliding surface when the first driving rod slides downward, so that the first abutment slides laterally, and a seventh return spring that can push the first driving rod to slide and return is also provided in the first connecting seat; the second driving member includes a second driving rod that can be pushed and slid by the hand push rod, and the lower end of the second driving rod is provided with a second inclined sliding surface, and the second body is provided with a second inclined surface that can cooperate with the second inclined sliding surface and can be pushed by the second inclined sliding surface when the second driving rod slides downward, so that the second abutment slides laterally, and the second connecting seat is also provided with an eighth return spring that can push the second driving rod to slide and return.

[0015] The locking device includes a locking hole provided on the upper support frame, a locking groove provided on the seat support, a locking spline which can move within the space surrounded by the seat support and the upper support frame and engage with the locking hole and the locking groove at the same time, and an eleventh spring is provided between the seat support and the locking spline, and a transmission member is provided in the seat support that can drive the locking spline to disengage from the locking hole when the push rod assembly rotates from the pushing position to the vertical position. The transmission member includes a transmission bar provided in the seat support, one end of the transmission bar abuts against the locking spline through the transmission inclined surface thereon, and the other end abuts against the driving part on the push rod assembly, and the driving part is provided with a matching inclined surface that abuts against the transmission bar. When the push rod assembly rotates relative to the seat support, the matching inclined surface pushes the transmission bar to make the transmission bar slide relative to the seat support, and a twelfth return spring is provided between the transmission bar and the seat support to reset the transmission bar.

[0016] The bottom support frame includes a front support assembly and a rear support assembly rotatably connected to the front support assembly, the front support assembly includes a front leg, a first connecting portion is provided at the upper end of the front leg, and a front wheel a is provided at the lower end of the front leg; the rear support assembly includes a rear leg, a second connecting portion is provided at the upper end of the rear leg, and a rear wheel a is provided at the lower end of the rear leg, the second connecting portion is rotatably connected to the first connecting portion around a first axis A, the upper support frame is rotatably connected to the front support assembly around a second axis B, a transmission rod is provided between the upper support frame and the rear support assembly, and one end of the transmission rod is connected to the front side of the upper support frame around The third axis C is rotatably connected, and the other end is rotatably connected to the rear support assembly around the fourth axis D. The transmission rod is rotatably connected to the upper support frame through the transmission shaft a thereon, and the first connection portion is provided with an arc-shaped groove in which the transmission shaft a can move. When the cart moves from the unfolded position to the folded position, the push rod assembly, the upper support frame and the seat move from the front side of the front leg to the front leg, and the rear support assembly moves from the rear side of the front leg to the front leg. A locking device is provided between the front support assembly and the rear support assembly to keep the cart in the unfolded state.

[0017] The locking device includes a locking block rotatably connected to the first connecting part, the second connecting part is provided with a locking groove that can engage or disengage with the locking block, the locking block is provided with a plurality of driven teeth, the first connecting part is also provided with an operating block that can rotate relative to it, the operating block is provided with driving teeth that cooperate with the driven teeth and drive the locking block to rotate when the operating block rotates, the upper support frame is provided with a protruding protruding block, the operating block is provided with a pressing part that can press the protruding block when the cart is in the expanded state and can disengage from the protruding block when the locking device is unlocked, and the first connecting part is also provided with a seventeenth reset spring that can drive the operating block and the locking block to rotate and reset.

[0018] The first connecting part is also provided with a moving column that can move laterally therein, and the operating block is provided with a slot, and the moving column is provided with a blocking block that can engage with the blocking slot when it moves to prevent the operating block from rotating relative to the first connecting part. The first connecting part is also provided with a thirteenth return spring that can drive the moving column to reset. The first connecting part is also provided with a sliding column that can be pushed by the moving column and slide longitudinally in the first connecting part. The moving column is provided with a locking part, and the sliding column is provided with a hook that can hook the locking part when the blocking block is disengaged from the slot to prevent the moving column from resetting. The upper end of the sliding column is provided with a matching part that can cooperate with the pressing part, and when the operating block rotates, the pressing part pushes the matching part to disengage the hook on the sliding column from the locking part, and the first connecting part is also provided with a fourteenth return spring that can reset the sliding column.

[0019] The seat is detachably connected to the seat support, and the seat support is provided with a bayonet. The seat includes a seat plate and a backrest connected to the seat plate. The seat plate is provided with a bayonet which can slide therein and engage or disengage with the bayonet. The seat plate is also provided with a push rod which can drive the bayonet to disengage from the bayonet when pushed. The seat plate is also provided with a fifteenth return spring which can drive the push rod to reset. The seat plate is also provided with a second sliding block which can slide up and down. The lower end of the second sliding block rests on the seat support, and a sixteenth return spring is provided between the second sliding block and the seat plate, which is in a compressed state when the bayonet is engaged with the bayonet and can push the second sliding block downward to move when the bayonet is disengaged from the bayonet.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The push rod assembly of the stroller of the present invention has two positions in which it can remain stationary: a push position and an upright position. When the push rod assembly is stationary in the push position, an adult can use the push rod assembly to push the stroller forward. When the push rod assembly rotates forward from the push position to the upright position, the adult can grasp the push rod assembly in the upright position and rotate the seat support in the horizontal direction. When the seat support rotates 180 degrees, the seat is reversed. Therefore, to reverse the seat, the adult only needs to rotate the push rod assembly forward in the vertical direction and then rotate it horizontally, making the operation very convenient and quick. More importantly, a control assembly is provided between the push rod assembly and the seat support. This control assembly can lock the push rod assembly in the upright position, preventing the push rod assembly from malfunctioning forward or backward due to unbalanced force when a horizontal torque is applied to the push rod assembly in the upright position during the seat reversal process, thereby ensuring safety. Furthermore, after the seat reversal is completed, the control assembly ensures that the push rod assembly can only rotate backward to the push position, preventing the push rod assembly from rotating forward, thus preventing malfunction and ensuring the reliability of the stroller.

Brief Description of the Drawings

[0022] Figure 1 It is a three-dimensional diagram of the present invention without the seat;

[0023] Figure 2 It is a side view of the present invention without the seat;

[0024] Figure 3 This is an exploded view of the present invention without the seat;

[0025] Figure 4 It is one of the perspective views of the components of the present invention;

[0026] Figure 5 This is a second perspective view of the components of the present invention;

[0027] Figure 6 It is a third perspective view of the components of the present invention;

[0028] Figure 7 It is one of the exploded views of the components of the present invention;

[0029] Figure 8 It is one of the exploded views of the components of the present invention;

[0030] Figure 9 This is the third exploded view of the components of the present invention;

[0031] Figure 10 is a partial cross-sectional view of the present invention;

[0032] Figure 11 yes Figure 10 Magnified view at M in the middle;

[0033] Figure 12 is a side view of a component of the present invention;

[0034] Figure 13 It is a side view with the seat facing forward and the push rod assembly in the push position;

[0035] Figure 14 It is a side view with the seat facing forward and the push rod assembly in the upright position;

[0036] Figure 15 It is a side view with the seat facing rearward and the push rod assembly in the upright position;

[0037] Figure 16 It is a side view with the seat facing rearward and the push rod assembly in the push position;

[0038] Figure 17 This is the third exploded view of the components of the present invention;

[0039] Figure 18 This Figure 17 Enlarged view at E in the middle;

[0040] Figure 19 This is a schematic diagram of a case where the second sliding member is engaged with the locking position and the push rod assembly is in the pushing position;

[0041] Figure 20 yes Figure 19 Enlarged view at F in the middle;

[0042] Figure 21 This is a second schematic diagram when the second sliding member is engaged with the locking position and the push rod assembly is in the pushing position;

[0043] Figure 22 yes Figure 21 Magnified view at H in the middle;

[0044] Figure 23 This is a schematic diagram of a case where the second sliding member is engaged with the latch and the push rod assembly is in a vertical position;

[0045] Figure 24 yes Figure 23 Magnified view at point I in the middle;

[0046] Figure 25 This is the second schematic diagram when the second sliding member is engaged with the locking position and the push rod assembly is in the vertical position;

[0047] Figure 26 yes Figure 25 Enlarged view at G in the middle;

[0048] Figure 27 is a perspective view of a first abutment member of the present invention;

[0049] Figure 28 It is a partial perspective view of the seat of the present invention;

[0050] Figure 29 It is an exploded view of the components of the seat of the present invention. [Specific implementation method]

[0051] The present invention will be further described below in conjunction with the accompanying drawings:

[0052] like Figures 1 to 3 , Figures 13 to 18As shown, a stroller includes a bottom support frame 1 with front wheels 11a and rear wheels 12a, an upper support frame 2 is connected to the upper part of the bottom support frame 1, a seat support 3 is connected to the upper support frame 2 and can rotate relative to the bottom support frame 1 in a horizontal plane, a seat 60 is provided on the seat support 3, a locking device 4 is provided between the seat support 3 and the upper support frame 2 and can lock the two, and a push rod assembly 5 is further connected to the seat support 3 and can drive the seat 60 to rotate in a horizontal plane to realize the front and rear reversal of the seat 60, and the push rod assembly 5 and the seat support 3 are connected. The two sides of the seat support 3 are rotatably connected, so that the positions in which the push rod assembly 5 can be located include a pushing position for pushing the stroller and a vertical position for driving the seat support 3 to rotate in the horizontal direction. A locking device is provided between the push rod assembly 5 and the seat support 3, which can keep the push rod assembly 5 in the pushing position when locked. A control component is also provided between the seat support 3 and the push rod assembly 5, which can lock the push rod assembly 5 in the vertical position when the push rod assembly 5 drives the seat 60 to change direction forward and backward, and ensure that the push rod assembly 5 can only be rotated back to the pushing position after the seat 60 has completed the change of direction. The positions in which the push rod assembly 5 can be located include the pushing position and the vertical position. When the push rod assembly 5 is located in the pushing position, an adult can push the stroller forward using the push rod assembly 5. When the push rod assembly 5 rotates forward from the pushing position to the vertical position, the adult can hold the push rod assembly 5 in the vertical position to drive the seat support 3 to rotate in the horizontal direction. When the seat support 3 rotates 180 degrees, the seat 60 has completed the forward and backward change of direction. Therefore, when an adult operates the seat 60 to change direction, they only need to rotate the push rod assembly 5 forward in the vertical direction and then rotate the push rod assembly 5 in the horizontal direction, which is very convenient and quick to operate. More importantly, a control assembly is also provided between the push rod assembly 5 and the seat support 3. This control assembly can lock the push rod assembly 5 in the vertical position, preventing the push rod assembly 5 from malfunctioning forward or backward due to unbalanced force when a horizontal torque is applied to the push rod assembly 5 in the vertical position during the process of reversing the seat 60, thereby ensuring safety. Moreover, after the seat 60 is reversed, the control assembly also ensures that the push rod assembly 5 can only rotate backward to the pushing position, preventing the push rod assembly 5 from rotating forward, thus avoiding malfunction and ensuring the reliability of the stroller.

[0053] like Figure 17 、 Figure 18 , Figures 19 to 26As shown, the push rod assembly 5 includes a first push rod 51 and a second push rod 52. The lower end of the first push rod 51 is connected to a first connecting seat 53 that can rotate relative to the seat support member 3, and the lower end of the second push rod 52 is connected to a second connecting seat 54 that can rotate relative to the seat support member 3. The control assembly includes a latch 61 provided on one side of the upper support frame 2. The seat support member 3 is provided with a first sliding member 62 and a second sliding member 63 that can slide therein and alternately engage with the latch 61 when the seat 60 is reversed. The first connecting seat 53 is provided with a first abutting member 64 that can slide therein and cooperate with the first sliding member 62. The second connecting seat 54 is provided with a second abutting member 65 that can slide therein and cooperate with the second sliding member 63. In the process of reversing the seat 60 back and forth, the following conditions are satisfied:

[0054] When the first sliding member 62 is disengaged from the locking member 61 and the second sliding member 63 is engaged with the locking member 61, and the push rod assembly 5 is in the vertical position, the first abutting member 64 can abut against the first sliding member 62 to prevent the push rod assembly 5 in the vertical position from rotating forward and ensure that the push rod assembly 5 in the vertical position can rotate backward to the pushing position;

[0055] When the first sliding member 62 is disengaged from the latch 61 and the second sliding member 63 is also disengaged from the latch 61, the first abutting member 64 abuts against the first sliding member 63 and the second abutting member 65 abuts against the second sliding member 63, thereby preventing the push rod assembly 5 in the vertical position from rotating forward and backward.

[0056] When the first sliding member 62 is engaged with the locking position 61, the second sliding member 63 is disengaged from the locking position 61 and the push rod assembly 5 is in the vertical position, the second abutment member 65 can abut against the second sliding member 63 to prevent the push rod assembly 5 in the vertical position from rotating forward and ensure that the push rod assembly 5 in the vertical position can rotate backward to the pushing position.

[0057] like Figures 19 to 22 , the first sliding member 62 is disengaged from the locking position 61, the second sliding member 63 is engaged with the locking position, and the push rod assembly 5 is in the pushing position. At this time, the user can push the stroller forward. In this state, the push rod assembly 5 can be rotated forward and moved from the pushing position to the vertical position. When the seat 60 needs to be reversed, the user rotates the push rod assembly 5 forward in the vertical plane, and the push rod assembly 5 rotates forward to the vertical position (such as Figures 23 to 26), at this time, the first abutment 64 touches the first sliding member 62, and at the same time, the second sliding member 63 is engaged with the locking position, and the second abutment 65 does not abut the second sliding member 63. Therefore, the push rod assembly 5 cannot continue to rotate forward, but can rotate backward to the pushing position. When the user applies a horizontal torque to the vertical push rod assembly 5, causing the push rod assembly 5 to drive the seat support 3 to rotate in the horizontal direction, the second sliding member 63 withdraws from the locking position 61. In this state, the second sliding member 63 moves to a position where it can be abutted by the second abutment 65. Therefore, the first abutment 64 prevents the push rod assembly 5 from rotating forward, and the second abutment 65 prevents the push rod assembly 5 from rotating backward, which is equivalent to the first abutment 64 and the second abutment 65 clamping the push rod assembly 5 from two directions. In this state, the push rod assembly 5 can neither rotate forward nor move forward. The push rod assembly 5 cannot rotate backward, ensuring safety during the seat reversal process. When the user continues to rotate the push rod assembly 5 in the horizontal direction and the seat 60 reaches the fully reversing position, the first sliding member 62 engages with the latch 61. At this time, the first abutment 64 no longer abuts the first sliding member 62, and the second sliding member 63 is still disengaged from the latch 63. Since the push rod assembly 5 has rotated 180 degrees in the horizontal direction, the second abutment 65 abutting the second sliding member 63 changes to prevent the push rod assembly 5 from rotating forward, allowing the push rod assembly 5 to rotate backward to the pushing position. The entire process is cleverly designed, easy to operate, and safe and reliable.

[0058] like Figures 17 to 27As shown, the first sliding member 62 includes a first sliding rod 621 that can slide in the seat support member 3, and a first engaging portion 622 that can engage with the locking position 61 is provided at one end of the first sliding rod 621, and a first connecting seat 623 is provided at the other end of the first sliding rod 621. The first connecting seat 623 is connected to a first sliding shaft 624 that can slide relative to the seat support member 3 and pass through the first connecting seat 53, and the first sliding shaft 624 and the first connecting seat 623 can be slidably connected relative to each other. A first return spring 625 that can push the first sliding rod 621 to return relative to the seat support member 3 is provided between the seat support member 3 and the first connecting seat 623, and a second return spring 626 that can push the first sliding shaft 624 to slide and return relative to the first connecting seat 623 is also provided between the first sliding shaft 624 and the first connecting seat 623. The first abutting member 64 includes a first body 641 provided in the first connecting seat 53, and the first body 641 is provided with a protruding first abutting portion 64 that can abut against the side wall of the first sliding shaft 624. 2; The second sliding member 63 includes a second sliding rod 631 that can slide in the seat support member 3, and one end of the second sliding rod 631 is provided with a second engaging portion 632 that can engage with the locking position 61, and the other end of the second sliding rod 631 is provided with a second connecting seat 633. The second connecting seat 633 is connected to a second sliding shaft 634 that can slide with it relative to the seat support member 3 and pass through the second connecting seat 54, and the second sliding shaft 634 and the second connecting seat 633 are relatively slidably connected. A third return spring 635 that can push the second sliding rod 631 to return relative to the seat support member 3 is provided between the seat support member 3 and the second connecting seat 633, and a fourth return spring 636 that can push the second sliding shaft 634 to slide and return relative to the second connecting seat 633 is further provided between the second sliding shaft 634 and the second connecting seat 633. The second abutting member 65 includes a second body 651 provided in the second connecting seat 54, and the second body 651 is provided with a protruding second abutting portion 652 that can abut against the side wall of the second sliding shaft 634. When the first engaging portion 622 is disengaged from the locking position, the first return spring 625 is in a compressed state, and the second return spring 626 pushes the first sliding shaft 624 to a position relative to the first abutting portion 642. At the same time, the second engaging portion 632 is engaged with the locking position 61. At this time, the third return spring 635 pushes the second sliding rod 631, and the second connecting seat 633 pulls the second sliding shaft 634, so that the second sliding shaft 634 is not opposite to the second abutting portion 652, that is, the second sliding shaft 634 cannot be abutted by the second abutting portion 652. In this state, the fourth return spring 636 is in a compressed state.When the seat 60 needs to be reversed, the push rod assembly 5 is rotated forward. When the push rod assembly 5 is rotated to the vertical position, the first sliding shaft 621 contacts the first abutment portion 642, and the first abutment portion 642 prevents the push rod assembly 5 from continuing to rotate forward. At the same time, since the second engaging portion 632 is still engaged with the blocking position 61, the second abutment portion 652 still cannot abut the second sliding shaft 631; when the push rod assembly 5 is continued to be rotated in the horizontal direction, the second engaging portion 632 is disengaged from the blocking position 61, and the fourth return spring 636 pushes the second sliding shaft 634 to move into the second connecting seat 54 to a position where it can be abutted by the second abutment portion 652, so that the push rod assembly 5 cannot be rotated backward to the pushing position, thereby achieving The push rod assembly 5 is locked in the vertical position; when the push rod assembly 5 continues to be rotated to the seat 60 to complete the 180-degree reversal, the first engaging portion 622 engages with the engaging position 61, and the first return spring 625 extends, pulling the first sliding shaft 624 to move through the first connecting seat 623, so that the first sliding shaft 624 and the first abutting portion 642 are disengaged, and the first abutting portion 642 no longer imposes any obstruction on the push rod assembly 5. Since the second abutting portion 652 that originally prevented the push rod assembly 5 from rotating backward has rotated 180 degrees in the horizontal plane, the second abutting portion 652 is now transformed to prevent the push rod assembly 5 from rotating forward, ensuring that the push rod assembly 5 cannot rotate forward, but can rotate backward to the pushing position.

[0059] like Figure 17 and Figure 18 As shown, the bottom support frame 1 includes a front support assembly 11 and a rear support assembly 12 that can rotate relative to the front support assembly 11. The position where the push rod assembly 5 stays also includes a folding position that can rotate forward and close to the front support assembly 11 after the locking device is unlocked. The first abutment 64 is slidably connected to the first connecting seat 53 and a fifth return spring 66 is provided between the two to push the first abutment 64 to slide and return to its original position. The second abutment 65 is slidably connected to the second connecting seat 54 and a sixth return spring 66 is provided between the two to push the second abutment 65 to slide and return to its original position. The first push rod 51 is provided with a first driving member 68 capable of pushing the first abutting member 64 to slide, and the second push rod 52 is provided with a second driving member 69 capable of pushing the second abutting member 65 to slide. When the first driving member 68 pushes the first abutting member 64 and the second driving member 69 pushes the second abutting member 65 to slide, the first abutting member 64 and the first sliding shaft 624, as well as the second abutting member 65 and the second sliding shaft 634, are always in a mutually disengaged state, so that the push rod assembly 5 can rotate forward from the pushing position to the folding position. Therefore, when the stroller needs to be folded, it is only necessary to drive the first abutting member 64 to slide by the first driving member 68 and the second abutting member 65 to slide by the second driving member 69, so that the first abutting member 64 and the second abutting member 65 cannot block the first sliding member 62 and the second sliding member 63, ensuring that the push rod assembly 5 can continue to rotate forward when it rotates forward from the pushing position to the upright position, thereby achieving the stroller folding. The design is ingenious.

[0060] like Figure 17 、 Figure 18 The first push rod 51 and the second push rod 52 are provided with a retractable hand push rod 55, the first driving member 68 includes a first driving rod 681 that can be pushed and slid by the hand push rod 55, the lower end of the first driving rod 681 is provided with a first inclined sliding surface 682, the first body 641 is provided with a first inclined surface 643 that can cooperate with the first inclined sliding surface 682 and can be pushed by the first inclined sliding surface 682 when the first driving rod 681 slides downward to make the first abutting member 64 slide horizontally, and the first connecting seat 53 is also provided with a first inclined surface 643 that can push the first driving rod 681 to slide The seventh return spring 683 for dynamic reset; the second driving member 69 includes a second driving rod 691 that can be pushed and slid by the hand push rod 55, and the lower end of the second driving rod 691 is provided with a second inclined sliding surface 692, and the second body 651 is provided with a second inclined surface 653 that can cooperate with the second inclined sliding surface 692 and can be pushed by the second inclined sliding surface 692 when the second driving rod 691 slides downward to make the second abutment member 65 slide horizontally, and the second connecting seat 54 is also provided with an eighth return spring 693 that can push the second driving rod 691 to slide and reset.

[0061] like Figure 17 As shown, the locking device 4 includes a locking hole 41 provided on the upper support frame 2, a locking groove 42 is provided on the seat support member 3, and a locking spline 43 that can move therein and engage with the locking hole 41 and the locking groove 42 at the same time is provided in the space enclosed by the seat support member 3 and the upper support frame 2. An eleventh spring 44 is also provided between the seat support member 3 and the locking spline 43. A transmission member 45 is provided in the seat support member 3, which can drive the locking spline 43 to disengage from the locking hole 41 during the rotation of the push rod assembly 5 from the pushing position to the vertical position. The transmission member 45 includes a transmission member provided on the seat support member 3. The transmission bar 451 within the support member 3 has one end resting against the locking spline 43 via a transmission bevel 452 thereon, and the other end resting against a driving portion 56 on the push rod assembly 5. The driving portion 56 is provided with a mating bevel 561 that engages with the transmission bar 451. When the push rod assembly 5 rotates relative to the seat support member 3, the mating bevel 561 pushes the transmission bar 451, causing it to slide relative to the seat support member 3. Furthermore, a twelfth return spring 46 is provided between the transmission bar 451 and the seat support member 3 to reset the transmission bar 451. When the seat needs to be reversed, the push rod assembly 5 rotates forward, pushing the transmission bar 451 laterally via the mating bevel 561. The transmission bevel 452 on the transmission bar 451 lifts the locking spline 43, thereby unlocking the seat support member 3 from the upper support frame 2.

[0062] like Figures 3 to 12As shown, the bottom support frame 1 includes a front support assembly 11 and a rear support assembly 12 rotatably connected to the front support assembly 11, the front support assembly 11 includes a front leg 111, the upper end of the front leg 111 is provided with a first connecting portion 112, and the front wheel 11a is provided at the lower end of the front leg 111, the rear support assembly 12 includes a rear leg 121, the upper end of the rear leg 121 is provided with a second connecting portion 122, and the rear wheel 12a is provided at the lower end of the rear leg 121, the second connecting portion 122 is rotatably connected to the first connecting portion 112 around a first axis A, the upper support frame 2 is rotatably connected to the front support assembly 11 around a second axis B, and a transmission rod 13 is provided between the upper support frame 2 and the rear support assembly 12, and one end of the transmission rod 13 It is rotatably connected to the front side of the upper support frame 2 around the third axis C, and the other end is rotatably connected to the rear support assembly 12 around the fourth axis D. The transmission rod 13 is rotatably connected to the upper support frame 2 through the transmission shaft 13a thereon, and the first connection part 112 is provided with an arc-shaped groove 115 for the transmission shaft 13a to move inside. When the cart moves from the unfolded position to the folded position, the push rod assembly 5, the upper support frame 2 and the seat 60 move from the front side of the front leg 111 to the front leg 111, and the rear support assembly 12 moves from the rear side of the front leg 111 to the front leg 111. A locking device 8 is provided between the front support assembly 11 and the rear support assembly 12 to keep the cart in the unfolded state. The second connecting portion 122 on the rear leg 121 of the stroller is rotatably connected to the first connecting portion 112 on the front leg 111, the upper support frame 2 is rotatably connected to the front support assembly 11, and the upper support frame 2 is rotatably connected to the rear support assembly 12 through the transmission rod 13. The entire stroller has fewer transmission connecting rods and is easy to fold.

[0063] like Figures 6 to 9 As shown, the upper support frame 2 is connected to the first connecting portion 12 around the second axis B, and the transmission rod 13 is connected to the second connecting portion 22 around the fourth axis D. The first connecting portion 112 is provided with an arcuate groove 113 in which the protruding block 84 can move. When the cart is deployed, the pressing portion 85 extends into the arcuate groove 113 to press the protruding block 84. The first connecting portion 112 has a shell-like structure, the transmission rod 13 is disposed within the first connecting portion 112, and the second connecting portion 122 is embedded in the first connecting portion 112.

[0064] like Figures 4 to 12As shown, the locking device 8 includes a locking block 81 rotatably connected to the first connecting portion 112, and a locking groove 82 is provided on the second connecting portion 122, which can engage with or disengage the locking block 81, and a plurality of driven teeth 811 are provided on the locking block 81. The first connecting portion 112 is also provided with an operating block 83 that can rotate relative to it, and the operating block 83 is provided with a driving tooth 831 that cooperates with the driven tooth 811 and drives the locking block 81 to rotate when the operating block 83 rotates. A protruding protruding block 84 is provided on the upper support frame 2, and a pressing portion 85 is provided on the operating block 83, which can press the protruding block 84 when the cart is in the expanded state and can disengage from the protruding block 84 when the locking device 8 is unlocked. A seventeenth return spring 86 that can drive the operating block 83 and the locking block 81 to rotate and return to normal is also provided in the first connecting portion 112. The first connecting portion 112 is provided with two arc-shaped channels 114. Two seventeenth return springs 86 are disposed in the corresponding arc-shaped channels 114. One end of the seventeenth return spring 86 rests on the first connecting portion 112 and the other end rests on the locking block 81. The other end of the seventeenth return spring rests on the first connecting portion 112 and the other end rests on the operating block 83. The first connecting portion 112 is also provided with a movable column 91 capable of moving laterally therein. The operating block 83 is provided with a slot 832. The movable column 91 is provided with a block 92 that engages with the slot 832 when it moves to prevent the operating block 83 from rotating relative to the first connecting portion 112. The first connecting portion 112 is also provided with a thirteenth return spring 93 that can drive the movable column 91 to return to its original position. The first connecting portion 112 is also provided with a sliding column 91 that can be pushed by the movable column 91 and slide longitudinally therein. 4. The movable column 91 is provided with a locking portion 95. The sliding column 94 is provided with a hook 96 that can hook the locking portion 95 to prevent the movable column 91 from returning to its original position when the locking block 92 is disengaged from the locking groove 832. The upper end of the sliding column 94 is provided with a mating portion 97 that can cooperate with the pressing portion 85. When the operating block 83 rotates, the pressing portion 85 pushes the mating portion 97 to disengage the hook 96 on the sliding column 94 from the locking portion 95. A fourteenth return spring 98 is also provided in the first connecting portion 112 to return the sliding column 94 to its original position.When unlocking, first push the moving column 91, and the block 92 on the moving column 91 will withdraw from the slot 832 on the operating block 83. When the block 92 withdraws from the slot 832, the hook 96 on the sliding column 94 can hook the locking portion 95 on the moving column 91, preventing the moving column 91 from sliding back to its original position, so that the unlocked state of the block 92 and the slot 832 can be maintained. At this time, the moving column 91 can be released and the operating block 83 can be rotated. During the rotation of the operating block 83, the driving teeth 831 The driven teeth 811 are driven, thereby disengaging the locking block 81 from the locking groove 82 on the second connecting portion 122, and the pressing portion 83 on the operating block 83 no longer presses the protruding block 84. At this time, the locking device is unlocked, and during the rotation of the operating block 83, the pressing portion 85 on the operating block 83 will also press the sliding column 94. During the sliding process of the sliding column 94, the hook 96 on the sliding column 94 disengages from the locking portion 95 on the moving column 91, allowing the moving column 91 to slide and return to its original position. The design is ingenious.

[0065] like Figure 17 、 Figure 18 and Figure 22As shown, a first locking seat 31 and a second locking seat 32 are provided on both sides of the seat support 3, and the locking device includes a first locking device 71 provided between the first locking seat 31 and the first connecting seat 53, and a second locking device 72 provided between the second locking seat 32 and the second connecting seat 54; the first locking device 71 includes a first locking groove 711 provided on the first locking seat 31 and the first connecting seat 53, and a first spline 712 is provided in the space enclosed by the first locking seat 31 and the first connecting seat 53, which can slide therein and can simultaneously engage with the first locking groove 711 on the first locking seat 31 and the first connecting seat 53, and a first spline 712 is provided between the first spline 712 and the first connecting seat 53, which can move laterally to push the first spline 712 to disengage from the first locking groove 711 on the first connecting seat 53 The first push block 713 is separated from the first connecting seat 53. A first sliding block 714 is further provided in the first connecting seat 53 and can slide longitudinally therein. The first sliding block 714 and the first pushing block 713 cooperate through inclined surfaces so that when the first sliding block 714 slides longitudinally, it can push the first pushing block 713 to slide horizontally. The first sliding block 714 is provided with a first cable 715 that can pull it to slide. A ninth return spring 716 is provided between the first spline 712 and the first locking seat 31, which can push the first spline 712 to return to its original position. A tenth return spring (not shown in the figure) is also provided between the first sliding block 714 and the first connecting seat 53, which can push the first sliding block 714 to return to its original position. The first sliding shaft 624 can slide relative to the first spline 712 and pass through the first spline 712 to engage with the first abutment member 64. The second locking device 72 can adopt the same structure as the first locking device 71 and will not be described in detail here. When the stroller needs to be folded or the seat needs to be changed, the first sliding block 714 is first pulled by the first cable 715. As the first sliding block 714 slides, it pushes the first pushing block 713 to slide laterally. The first pushing block 713 pushes the first spline 712 to slide laterally, disengaging the first spline 712 from the first locking groove 711 on the first connecting seat 53. At this point, the first locking device 71 is unlocked, and the second locking device 72 is unlocked in the same manner. Once the locking devices are unlocked, the push rod assembly 5 can be rotated forward. Specifically, if the seat needs to be changed, the push rod assembly 5 is rotated to a vertical position. If the stroller needs to be folded, the hand push rod 55 is first pushed, which pushes the first drive rod 681 and the second drive rod 691, thereby preventing the first and second abutting portions 64 and 65 from interfering with the first and second slides 62 and 63, ensuring that the push rod assembly 5 can be rotated forward to the folded position close to the front legs 111. The locking devices are then unlocked, allowing the stroller to be folded.

[0066] like Figure 28 and Figure 29As shown, the seat 60 is detachably connected to the seat support 3, and the seat support 3 is provided with a bayonet 33. The seat 60 includes a seat plate 601 and a backrest 602 connected to the seat plate 601. The seat plate 601 is provided with a bayonet 701 that can slide therein and engage or disengage with the bayonet 33. The seat plate 601 is also provided with a push rod 702 that can drive the bayonet 701 to disengage from the bayonet 33 when pushed. The seat plate 601 is also provided with a fifteenth return spring 703 that can drive the push rod 702 to return to its original position. The seat plate 601 is also provided with a second sliding block 704 that can slide up and down. The lower end of the second sliding block 704 rests on the seat support 3, and a sixteenth return spring 705 is provided between the second sliding block 704 and the seat plate 601. The spring is in a compressed state when the bayonet 701 is engaged with the bayonet 33, and can push the second sliding block 704 downward to move when the bayonet 701 is disengaged from the bayonet 33. When the seat 60 needs to be removed from the seat support 3, the push rod 702 is pushed, and the push rod 702 pushes the pin 701 out of the socket 33. Once the pin 701 is out of the socket 33, the sixteenth return spring 705 extends and presses the second sliding block 704 downward. The second sliding block 704 moves downward and slightly lifts the seat 60 on that side. At this time, even if the push rod 702 is released, the pin 701 can no longer engage with the socket 33. At this time, you can free your hand to push the push rod 702 on the other side of the seat 60, thereby disengaging the pin 701 on the other side from the socket 33.

Claims

1. A cart, characterized in that: include: A bottom support frame (1) having a front wheel (11a) and a rear wheel (12a), wherein the bottom support frame (1) is connected to an upper support frame (2), and the upper support frame (2) is connected to a seat support member (3) capable of rotating relative to the bottom support frame (1) in a horizontal plane direction, and the seat support member (3) is provided with a seat (60) for riding, and a locking device (4) capable of locking the seat support member (3) and the upper support frame (2) is provided between the seat support member (3) and the upper support frame (2), and the seat support member (3) is also connected to a push rod assembly (5) capable of driving the seat support member to rotate in a horizontal plane direction to realize the front and rear reversal of the seat (60), and the push rod assembly (5) is rotatably connected to both sides of the seat support member (3) so that the push rod assembly (5) can stay The position includes a pushing position capable of pushing the stroller and a vertical position for driving the seat support (3) to rotate in the horizontal direction. A locking device is provided between the push rod assembly (5) and the seat support (3) to keep the push rod assembly (5) in the pushing position when locked. A control assembly is also provided between the seat support (3) and the push rod assembly (5) to lock the push rod assembly (5) in the vertical position when the push rod assembly (5) drives the seat (60) to reverse forward and backward and to ensure that the push rod assembly (5) can only be turned back to the pushing position when the seat (60) is reversed. The bottom support frame (1) includes a front support assembly (11) and a rear support assembly (12) rotatably connected to the front support assembly (11). The front support assembly (11) includes a The front legs (111) are provided with a first connecting portion (112) at the upper end of the front legs (111); the rear support assembly (12) includes a rear leg (121); the upper end of the rear leg (121) is provided with a second connecting portion (122); a locking device (8) is provided between the front support assembly (11) and the rear support assembly (12) to keep the cart in an unfolded state; the locking device (8) includes a locking block (81) rotatably connected to the first connecting portion (112); the second connecting portion (122) is provided with a locking groove (82) that can be engaged with or disengaged from the locking block (81); the locking block (81) is provided with a plurality of driven teeth (811); the first connecting portion (112) is also provided with a locking member that can be rotated relative to the locking member (81). The movable operating block (83) is provided with a driving tooth (831) on the operating block (83) that cooperates with the driven tooth (811) and drives the locking block (81) to rotate when the operating block (83) rotates. The upper support frame (2) is provided with a protruding protruding block (84). The operating block (83) is provided with a pressing portion (85) that can press the protruding block (84) when the cart is in the unfolded state and can be separated from the protruding block (84) when the locking device (8) is unlocked. The first connecting portion (112) is also provided with a seventeenth return spring (86) that can drive the operating block (83) and the locking block (81) to rotate and reset. The first connecting portion (112) is also provided with a moving column (91) that can move laterally therein.The operating block (83) is provided with a slot (832), the movable column (91) is provided with a block (92) which can engage with the slot (832) when the operating block (83) moves to prevent the operating block (83) from rotating relative to the first connecting portion (112), the first connecting portion (112) is also provided with a thirteenth return spring (93) which can drive the movable column (91) to return, the first connecting portion (112) is also provided with a sliding column (94) which can be pushed by the movable column (91) and slide longitudinally in the first connecting portion (112), the movable column (91) is provided with a locking portion (95), the sliding column (94) is provided with a hook (96) which can hook the locking portion (95) to prevent the movable column (91) from returning when the block (92) is disengaged from the slot (832), the upper end of the sliding column (94) is provided with a matching portion (97) which can cooperate with the pressing portion (85), the operating block (83) is provided with a locking portion (95) when the locking portion ...5) is disengaged from the slot (832), the upper end ) when rotating, the pressing portion (85) pushes the fitting portion (97) to disengage the hook (96) on the sliding column (94) from the locking portion (95), and the first connecting portion (112) is further provided with a fourteenth return spring (98) capable of returning the sliding column (94), the seat (60) is detachably connected to the seat support (3), the seat support (3) is provided with a bayonet (33), and the seat (60) includes a seat plate (601 ) and a backrest (602) connected to the seat plate (601), the seat plate (601) is provided with a latch (701) that can slide therein and engage or disengage with the bayonet (33), the seat plate (601) is also provided with a push rod (702) that can drive the latch (701) to disengage from the bayonet (33) when pushed, and the seat plate (601) is also provided with a fifteenth return spring (703) that can drive the push rod (702) to return to its original position.

2. The cart according to claim 1, wherein: The push rod assembly (5) includes a first push rod (51) and a second push rod (52), the lower end of the first push rod (51) is connected to a first connecting seat (53) that can rotate relative to the seat support member (3), and the lower end of the second push rod (52) is connected to a second connecting seat (54) that can rotate relative to the seat support member (3), and the control assembly includes a clamping position (61) provided on one side of the upper support frame (2), the seat support member (3) is provided with a first sliding member (62) and a second sliding member (63) that can slide therein and alternately engage with the clamping position (61) when the seat (60) changes direction, the first connecting seat (53) is provided with a first abutting member (64) that can slide therein and cooperate with the first sliding member (62), and the second connecting seat (54) is provided with a second abutting member (65) that can slide therein and cooperate with the second sliding member (63), and in the process of the seat (60) changing direction forward and backward, the following conditions are satisfied: When the first sliding member (62) is disengaged from the locking position (61), the second sliding member (63) is engaged with the locking position (61), and the push rod assembly (5) is in the vertical position, the first abutting member (64) can abut against the first sliding member (62) to prevent the push rod assembly (5) in the vertical position from rotating forward and ensure that the push rod assembly (5) in the vertical position can rotate backward to the pushing position; When the first sliding member (62) is disengaged from the locking position (61) and the second sliding member (63) is also disengaged from the locking position (61), the first abutting member (64) abuts against the first sliding member (62) and the second abutting member (65) abuts against the second sliding member (63), thereby preventing the push rod assembly (5) in the vertical position from rotating forward and backward; When the first sliding member (62) is engaged with the locking position (61), the second sliding member (63) is disengaged from the locking position (61), and the push rod assembly (5) is in the vertical position, the second abutting member (65) can abut against the second sliding member (63) to prevent the push rod assembly (5) in the vertical position from rotating forward and ensure that the push rod assembly (5) in the vertical position can rotate backward to the pushing position.

3. The cart according to claim 2, wherein: The first sliding member (62) includes a first sliding rod (621) that can slide in the seat support member (3), one end of the first sliding rod (621) is provided with a first engaging portion (622) that can engage with the engaging portion (61), and the other end of the first sliding rod (621) is provided with a first connecting seat (623), and the first connecting seat (623) is connected with a first sliding shaft (624) that can slide relative to the seat support member (3) and pass through the first connecting seat (53), and the first sliding shaft (624) and the first connecting seat (623) can be connected to each other in a relatively slidable manner. (3) A first return spring (625) is provided between the first connecting seat (623) and the first sliding rod (621) to be reset relative to the seat support member (3); a second return spring (626) is provided between the first sliding shaft (624) and the first connecting seat (623) to be able to push the first sliding shaft (624) to slide and reset relative to the first connecting seat (623); the first abutting member (64) includes a first body (641) provided in the first connecting seat (53); the first body (641) is provided with a protruding first abutting portion (642) that can abut against the side wall of the first sliding shaft (624); The second sliding member (63) includes a second sliding rod (631) that can slide in the seat support member (3), one end of the second sliding rod (631) is provided with a second engaging portion (632) that can engage with the engaging portion (61), and the other end of the second sliding rod (631) is provided with a second connecting seat (633), and the second connecting seat (633) is connected with a second sliding shaft (634) that can slide relative to the seat support member (3) and pass through the second connecting seat (54), and the second sliding shaft (634) and the second connecting seat (633) can be connected to each other in a relatively slidable manner. (3) A third return spring (635) is provided between the second connecting seat (633) and the second connecting seat (633) for pushing the second sliding rod (631) to return relative to the seat support (3), and a fourth return spring (636) is provided between the second sliding shaft (634) and the second connecting seat (633) for pushing the second sliding shaft (634) to slide and return relative to the second connecting seat (633). The second abutting member (65) includes a second body (651) provided in the second connecting seat (54), and the second body (651) is provided with a protruding second abutting portion (652) that can abut against the side wall of the second sliding shaft (634).

4. The cart according to claim 3, wherein: The bottom support frame (1) includes a front support assembly (11) and a rear support assembly (12) that can rotate relative to the front support assembly (11). The position where the push rod assembly (5) stops also includes a folding position that can rotate forward and close to the front support assembly (11) after the locking device is unlocked. The first abutment member (64) is slidably connected to the first connecting seat (53) and a fifth return spring (66) is provided between the two to push the first abutment member (64) to slide and return. The second abutment member (65) is slidably connected to the second connecting seat (54) and a sixth return spring is provided between the two to push the second abutment member (65) to slide and return. (67), the first push rod (51) is provided with a first driving member (68) capable of pushing the first abutting member (64) to slide, and the second push rod (52) is provided with a second driving member (69) capable of pushing the second abutting member (65) to slide. When the first driving member (68) pushes the first abutting member (64) and the second driving member (69) pushes the second abutting member (65) to slide, the first abutting member (64) and the first sliding shaft (624) as well as the second abutting member (65) and the second sliding shaft (634) are always in a disengaged state from each other so that the push rod assembly (5) can be rotated forward from the pushing position to the folding position.

5. The cart according to claim 4, wherein: The first push rod (51) and the second push rod (52) are connected to a retractable hand push rod (55), the first driving member (68) includes a first driving rod (681) that can be pushed and slid by the hand push rod (55), the lower end of the first driving rod (681) is provided with a first inclined sliding surface (682), the first body (641) is provided with a first inclined surface (643) that can cooperate with the first inclined sliding surface (682) and can be pushed by the first inclined sliding surface (682) when the first driving rod (681) slides downward to make the first supporting member (64) slide horizontally, and the first connecting seat (53) is also provided with a first inclined surface (643) that can push the first driving rod (681) to slide horizontally. 1) A seventh return spring (683) for sliding return; the second driving member (69) includes a second driving rod (691) that can be pushed and slid by the hand push rod (55), and a second inclined sliding surface (692) is provided at the lower end of the second driving rod (691). The second body (651) is provided with a second inclined surface (653) that can cooperate with the second inclined sliding surface (692) and can be pushed by the second inclined sliding surface (692) when the second driving rod (691) slides downward to cause the second supporting member (65) to slide horizontally. The second connecting seat (54) is also provided with an eighth return spring (693) that can push the second driving rod (691) to slide and return.

6. The stroller according to claim 5, characterized in that: The locking device (4) includes a locking hole (41) provided on the upper support frame (2), a locking groove (42) provided on the seat support member (3), a locking spline (43) that can move in the space enclosed by the seat support member (3) and the upper support frame (2) and is engaged with the locking hole (41) and the locking groove (42) at the same time, an eleventh spring (44) is also provided between the seat support member (3) and the locking spline (43), and a transmission member (45) is provided in the seat support member (3) that can drive the locking spline (43) to disengage from the locking hole (41) when the push rod assembly (5) rotates from the pushing position to the vertical position, and the transmission member (45) includes a locking spline (43) provided on the seat support member (3) and a locking spline (43) that can move in the space enclosed by the seat support member (3) and the upper support frame (2). A transmission bar (451) in the support member (3), one end of the transmission bar (451) abuts against the locking spline (43) through the transmission bevel (452) thereon, and the other end abuts against the driving portion (56) on the push rod assembly (5), and the driving portion (56) is provided with a matching bevel (561) that abuts against the transmission bar (451). When the push rod assembly (5) rotates relative to the seat support member (3), the matching bevel (561) pushes the transmission bar (451) to make the transmission bar (451) slide relative to the seat support member (3), and a twelfth reset spring (46) is provided between the transmission bar (451) and the seat support member (3) to reset the transmission bar (451).

7. The stroller according to any one of claims 1 to 6, characterized in that: The front wheel (11a) is provided at the lower end of the front leg (111), the rear wheel (12a) is provided at the lower end of the rear leg (121), the second connecting portion (122) is rotatably connected to the first connecting portion (112) around a first axis (A), the upper support frame (2) is rotatably connected to the front support assembly (11) around a second axis (B), a transmission rod (13) is provided between the upper support frame (2) and the rear support assembly (12), one end of the transmission rod (13) is rotatably connected to the front side of the upper support frame (2) around a third axis (C), and the other end is rotatably connected to the front side of the upper support frame (2) around a fourth axis (D ) is rotatably connected to the rear support assembly (12), the transmission rod (13) is rotatably connected to the upper support frame (2) through the transmission shaft (13a) thereon, and the first connection portion (112) is provided with an arc-shaped groove (115) in which the transmission shaft (13a) can move. When the cart moves from the unfolded position to the folded position, the push rod assembly (5), the upper support frame (2) and the seat (60) move from the front side of the front leg (111) to the front leg (111), and the rear support assembly (12) moves from the rear side of the front leg (111) to the front leg (111).

8. The stroller according to any one of claims 1 to 6, characterized in that: A second sliding block (704) capable of sliding up and down is further provided in the seat plate (601), the lower end of the second sliding block (704) rests on the seat support (3), and a sixteenth return spring (705) is provided between the second sliding block (704) and the seat plate (601), which is in a compressed state when the latch (701) and the bayonet (33) are engaged and can push the second sliding block (704) downward to move when the latch (701) and the bayonet (33) are disengaged.

Images