CN116062016A - Barrow - Google Patents

Abstract

The invention discloses a trolley, wherein the upper part of a bottom supporting frame is connected with an upper supporting frame, a seat supporting piece is connected to the upper supporting frame, a seat is arranged on the seat supporting piece, a locking device is arranged between the seat supporting piece and the upper supporting frame, a push rod component capable of driving the seat supporting piece to rotate in the horizontal plane direction is also connected to the seat supporting piece, the push rod component is rotatably connected with two sides of the seat supporting piece, so that the position where the push rod component can stay comprises a pushing position capable of pushing the trolley and a vertical position for driving the seat supporting piece to rotate in the horizontal plane direction, a locking device capable of enabling the push rod component to be kept in the pushing position when the push rod component is locked is arranged between the push rod component and the seat supporting piece, and a control component capable of locking the push rod component in the vertical position when the push rod component drives the seat to change front and back and ensuring that the push rod component can only be rotated to the pushing position when the seat change is completed is also arranged between the seat supporting piece and the seat supporting piece. The invention has convenient operation, safety and reliability.

Description

Barrow

[ field of technology ]

The invention relates to a cart.

[ background Art ]

Baby carriages have become an indispensable product in the growth process of infants. The children's carriages on the market at present can generally realize the switching-over of seat to make children who take in the seat face backward the adult of shallow or face forward, but traditional seat switching-over operation need stretch the hand to the seat and go down the operation, need bow and stretch the hand to the seat and fumbly down, the operation is inconvenient.

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

[ invention ]

The invention aims to overcome the defects of the prior art and provides the trolley which is simple in structure, convenient to operate, safe and reliable.

The invention is realized by the following technical scheme:

a cart, comprising: the seat support comprises a seat support body, a seat support, a push rod assembly, a control assembly and a control assembly, wherein the seat support body is provided with a front wheel and a rear wheel, the bottom support body is provided with a front wheel and a rear wheel, the upper portion of the bottom support body is connected with an upper support frame, the upper support frame is connected with a seat support body which can rotate in the horizontal plane direction relative to the upper support frame, a seat support member capable of rotating in the horizontal plane direction is arranged on the upper support frame, a locking device capable of enabling the push rod assembly to be kept at the pushing position is arranged between the push rod assembly and the seat support member, a locking device capable of locking the push rod assembly at the pushing position when the push rod assembly drives the seat to rotate in the horizontal plane direction is arranged between the seat support member and the upper support frame, the push rod assembly capable of driving the push rod assembly to rotate in the horizontal plane direction so as to realize front-back direction of the seat, the push rod assembly is rotatably connected with the two sides of the seat support member, the push rod assembly is enabled to stay at the position capable of being rotated in the horizontal direction when the seat direction is completed, and the control assembly capable of only being rotated to be kept at the pushing position is arranged between the push rod assembly and the push rod assembly.

The push rod assembly comprises a first push rod and a second push rod, wherein the lower end of the first push rod is connected with a first connecting seat which can rotate relative to the seat support, the lower end of the second push rod is connected with a second connecting seat which can rotate relative to the seat support, the control assembly comprises a clamping position arranged on one side of an upper support frame, a first sliding piece and a second sliding piece which can slide in the seat support and can be alternatively clamped with the clamping position when the seat is reversed are arranged in the seat support, a first abutting piece which can slide in the seat support and can be matched with the first sliding piece is arranged in the first connecting seat, a second abutting piece which can slide in the seat support and can be matched with the second sliding piece is arranged in the second connecting seat, and the process of reversing around the seat is satisfied:

when the first sliding piece is separated from the clamping position, the second sliding piece is clamped with the clamping position and the push rod assembly is positioned at the vertical position, the first abutting piece can abut against the first sliding piece to prevent the push rod assembly at the vertical position from rotating forwards and ensure that the push rod assembly at the vertical position can rotate backwards to the pushing position;

when the first sliding piece is separated from the clamping position and the second sliding piece is also separated from the clamping position, the first abutting piece abuts against the first sliding piece, and the second abutting piece abuts against the second sliding piece, so that the push rod assembly at the vertical position can be prevented from rotating forwards and backwards;

When the first sliding piece is clamped with the clamping position, the second sliding piece is separated from the clamping position and the push rod assembly is located at the vertical position, the second abutting piece can abut against the second sliding piece to prevent the push rod assembly at the vertical position from rotating forwards, and the push rod assembly at the vertical position can be guaranteed to rotate backwards to the pushing position.

The first sliding piece comprises a first sliding rod capable of sliding in the seat support piece, a first clamping part capable of being clamped with the clamping position is arranged at one end of the first sliding rod, a first connecting seat is arranged at the other end of the first sliding rod, a first sliding shaft capable of sliding relative to the seat support piece and penetrating into the first connecting seat is connected to the first connecting seat, the first sliding shaft and the first connecting seat can be in sliding connection relatively, a first reset spring capable of pushing the first sliding rod to reset relative to the seat support piece is arranged between the seat support piece and the first connecting seat, a second reset spring capable of pushing the first sliding shaft to reset relative to the first connecting seat is also arranged between the first sliding shaft and the first connecting seat, the first abutting piece comprises a first body arranged in the first connecting seat, and a first abutting part capable of being protruded and abutting against the side wall of the first sliding shaft is arranged on the first body;

The second sliding piece comprises a second sliding rod capable of sliding in the seat supporting piece, a second clamping part capable of being clamped with the clamping position is arranged at one end of the second sliding rod, a second connecting seat is arranged at the other end of the second sliding rod, a second sliding shaft capable of sliding relative to the seat supporting piece and penetrating into the second connecting seat is connected to the second connecting seat, the second sliding shaft and the second connecting seat can be in sliding connection relatively, a third reset spring capable of pushing the second sliding rod to reset relative to the seat supporting piece is arranged between the seat supporting piece and the second connecting seat, a fourth reset spring capable of pushing the second sliding shaft to reset relative to the second connecting seat is further arranged between the second sliding shaft and the second connecting seat, the second abutting piece comprises a second body arranged in the second connecting seat, and a second abutting part which is protruded and can abut against the side wall of the second sliding shaft is arranged on the second body.

The bottom support frame comprises a front support assembly and a rear support assembly capable of rotating relative to the front support assembly, the stop position of the push rod assembly further comprises a folding position capable of being moved forward to the front support assembly after the locking device is unlocked, the first support member is in sliding connection with the first connecting seat, a fifth reset spring capable of pushing the first support member to slide and reset is arranged between the first support member and the first connecting seat, a sixth reset spring capable of pushing the second support member to slide and reset is arranged between the second support member and the second connecting seat, a first driving member capable of pushing the first support member to slide is arranged in the first push rod, a second driving member capable of pushing the second support member to slide is arranged in the second push rod, and when the first driving member pushes the first support member and the second driving member to push the second support member to slide, the first support member and the first sliding shaft and the second support member and the second sliding shaft are all in a mutually separated state all the time so that the push rod assembly can be rotated forward from the pushing position to the folding position.

The first push rod and the second push rod are connected with telescopic push rods, the first driving piece comprises a first driving rod which can be pushed by the push rods to slide, a first inclined sliding surface is arranged at the lower end of the first driving rod, a first inclined surface which can be matched with the first inclined sliding surface and can be pushed by the first inclined sliding surface to enable the first abutting piece to transversely slide when the first driving rod slides downwards is arranged on the first body, and a seventh reset spring which can push the first driving rod to slide and reset is also arranged in the first connecting seat; the second driving piece comprises a second driving rod which can be pushed to slide by the hand push rod, a second inclined sliding surface is arranged at the lower end of the second driving rod, a second inclined surface which can be matched with the second inclined sliding surface and can be pushed by the second inclined sliding surface to enable the second abutting piece to transversely slide when the second driving rod slides downwards is arranged on the second body, and an eighth reset spring which can push the second driving rod to slide and reset is further arranged in the second connecting seat.

The locking device comprises a locking hole arranged on the upper supporting frame, a locking groove is arranged on the seat supporting piece, a locking spline which can move in the space surrounded by the seat supporting piece and the upper supporting frame and is simultaneously clamped with the locking hole and the locking groove is arranged in the space surrounded by the seat supporting piece and the upper supporting frame, an eleventh spring is further arranged between the seat supporting piece and the locking spline, a transmission piece which can drive the locking spline to be separated from the locking hole in the process of rotating the push rod assembly from the pushing position to the vertical position is arranged in the seat supporting piece, the transmission piece comprises a transmission strip arranged in the seat supporting piece, one end of the transmission strip abuts against the locking spline through a transmission inclined surface on the transmission strip, the other end of the transmission strip abuts against a driving part on the push rod assembly, a matching inclined surface which is matched with the transmission strip in an abutting mode is arranged on the driving part, when the push rod assembly rotates relative to the seat supporting piece, the transmission strip is pushed by the matching inclined surface to slide relative to the seat supporting piece, and a twelfth reset spring which can reset the transmission strip is arranged between the transmission strip and the seat supporting piece.

The bottom support frame comprises a front support assembly and a rear support assembly rotatably connected with the front support assembly, the front support assembly comprises a front leg, a first connecting part is arranged at the upper end of the front leg, a front wheel a is arranged at the lower end of the front leg, the rear support assembly comprises a rear leg, a second connecting part is arranged at the upper end of the rear leg, the rear wheel a is arranged at the lower end of the rear leg, the second connecting part is rotatably connected with the first connecting part around a first axis A, the upper support frame is rotatably connected with the front support assembly around a second axis B, a transmission rod is arranged between the upper support frame and the rear support assembly, one end of the transmission rod is rotatably connected with the front side of the upper support frame around a third axis C, the other end of the transmission rod is rotatably connected with the rear support assembly around a fourth axis D, an arc-shaped groove which can be used for the transmission shaft a to move inside is arranged on the first connecting part, when the trolley moves from an unfolding position to a folding position, the push rod assembly, the upper support frame and a seat are gathered onto the front leg from the front side of the front support frame, one end of the front support frame is rotatably connected with the front support assembly around a third axis C, and a locking device is arranged between the front support assembly and the front support assembly.

The locking device comprises a locking block which is rotationally connected to the first connecting part, a locking groove which can be clamped with or separated from the locking block is formed in the second connecting part, a plurality of driven teeth are arranged on the locking block, an operation block which can rotate relative to the locking block is further arranged on the first connecting part, a driving tooth which is matched with the driven teeth and drives the locking block to rotate when the operation block rotates is arranged on the operation block, a protruding block is arranged on the upper supporting frame, a pressing part which can press the protruding block when the cart is in an unfolding state and can be separated from the protruding block when the locking device is unlocked is arranged on the operation block, and a seventeenth reset spring which can drive the operation block and the locking block to rotate and reset is further arranged in the first connecting part.

The first connecting part is internally provided with a moving column capable of transversely moving in the first connecting part, the operating block is provided with a clamping groove, the moving column is provided with a clamping block which can be clamped with the clamping groove when the operating block moves so as to prevent the operating block from rotating relative to the first connecting part, the first connecting part is internally provided with a thirteenth reset spring capable of driving the moving column to reset, the first connecting part is internally provided with a sliding column capable of being pushed by the moving column to longitudinally slide in the first connecting part, the moving column is provided with a clamping lock part, the sliding column is provided with a clamping hook which can be used for clamping the clamping lock part to prevent the moving column from resetting when the clamping block is separated from the clamping groove, the upper end of the sliding column is provided with a matching part which can be matched with the pressing part, the operating block pushes the matching part to separate the clamping hook from the clamping lock part on the sliding column when the operating block rotates, and the first connecting part is internally provided with a fourteenth reset spring capable of resetting the sliding column.

The seat is detachably connected to the seat support, the seat support is provided with a bayonet, the seat comprises a seat plate and a backrest connected to the seat plate, the seat plate is provided with a bayonet lock which can slide in the seat plate and can be clamped with or separated from the bayonet lock, the seat plate is also provided with a push rod which can drive the bayonet lock to separate from the bayonet lock when being pushed, the seat plate is also internally provided with a fifteenth reset spring which can drive the push rod to reset, the seat plate is also internally provided with a second sliding block which can slide up and down, the lower end of the second sliding block is propped against the seat support, and a sixteenth reset spring which is in a compressed state when the bayonet lock is clamped with the bayonet lock and can push the second sliding block to move downwards when the bayonet lock is separated from the bayonet lock is arranged between the second sliding block and the seat plate.

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

1. the push rod assembly of the cart comprises a pushing position and a vertical position, when the push rod assembly is stopped at the pushing position, a adult can push the cart to walk forwards through the push rod assembly, when the push rod assembly rotates forwards from the pushing position to the vertical position, the adult can hold the push rod assembly at the vertical position to drive the seat support to rotate in the horizontal plane direction, and when the seat support rotates 180 degrees, the seat can be reversed forwards and backwards. Therefore, when a person operating the seat changes direction, the person only needs to rotate the push rod assembly forwards in the vertical plane direction and then rotate the push rod assembly in the horizontal plane direction, and the operation is very convenient and quick. More importantly, a control assembly is further arranged between the push rod assembly and the seat support, the control assembly can lock the push rod assembly at the vertical position, forward or backward misoperation of the push rod assembly caused by unbalanced force application when horizontal-plane-direction torsion is applied to the push rod assembly at the vertical position in the process of seat reversing is avoided, safety is ensured, the control assembly also ensures that the push rod assembly can only rotate backwards to return to the pushing position after seat reversing is finished, the push rod assembly is prevented from rotating forwards, misoperation is avoided, and the use reliability of the trolley is ensured.

[ description of the drawings ]

FIG. 1 is a perspective view of the present invention with the seat removed;

FIG. 2 is a side view of the invention with the seat removed;

FIG. 3 is an exploded view of the present invention with the seat removed;

FIG. 4 is one of the perspective views of the components of the present invention;

FIG. 5 is a second perspective view of the component of the present invention;

FIG. 6 is a third perspective view of the components of the present invention;

FIG. 7 is one of the exploded views of the components of the present invention;

FIG. 8 is one of the exploded views of the components of the present invention;

FIG. 9 is a third exploded view of the components of the present invention;

FIG. 10 is a partial cross-sectional view of the present invention;

fig. 11 is an enlarged view at M in fig. 10;

FIG. 12 is a side view of a component of the present invention;

FIG. 13 is a side view of the seat forward with the push rod assembly in the reclined position;

FIG. 14 is a side view of the seat forward with the push rod assembly in the upright position;

FIG. 15 is a side view of the seat facing rearward and the push rod assembly in the upright position;

FIG. 16 is a side view of the seat facing rearward and the push rod assembly in the reclined position;

FIG. 17 is a third exploded view of the components of the present invention;

fig. 18 is an enlarged view at E in fig. 17;

FIG. 19 is a schematic view of the second slider engaged with the detent and the push rod assembly in the pushing position;

Fig. 20 is an enlarged view at F in fig. 19;

FIG. 21 is a second schematic view of the second slider engaged with the detent and the push rod assembly in the pushing position;

fig. 22 is an enlarged view at H in fig. 21;

FIG. 23 is one of the schematic views of the second slider engaged with the detent and the push rod assembly in the upright position;

fig. 24 is an enlarged view at I in fig. 23;

FIG. 25 is a second schematic view of the second slider engaged with the detent and the push rod assembly in the vertical position;

fig. 26 is an enlarged view at G in fig. 25;

FIG. 27 is a perspective view of a first abutment of the present invention;

FIG. 28 is a partial perspective view of the seat of the present invention;

fig. 29 is an exploded view of the components of the seat of the present invention.

[ detailed description ] of the invention

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

as shown in fig. 1 to 3 and fig. 13 to 18, a cart comprises a bottom support frame 1 with a front wheel 11a and a rear wheel 12a, an upper support frame 2 is connected to the upper part of the bottom support frame 1, a seat support 3 capable of rotating in the horizontal plane direction relative to the upper support frame is connected to the upper support frame 2, a seat 60 capable of being taken is arranged on the seat support 3, a locking device 4 capable of locking the seat support 3 and the upper support frame 2 is arranged between the seat support 3 and the upper support frame 2, a push rod assembly 5 capable of driving the push rod assembly 5 to rotate in the horizontal plane direction to realize front and rear direction of the seat 60 is also connected to the seat support 3, the push rod assembly 5 is rotatably connected with two sides of the seat support 3 so that the position where the push rod assembly 5 can stay comprises a pushing position capable of pushing the cart and a vertical position for driving the seat support 3 to rotate in the horizontal plane direction, a locking device capable of keeping the push rod assembly 5 in the pushing position when the seat 60 is locked is arranged between the push rod assembly 5 and the seat support 3, and the push rod assembly 5 is also arranged between the seat support 3 and the push rod assembly 5 so that the push rod assembly 5 can be controlled to return to the push rod assembly 5 to the position when the push rod assembly 5 can complete the front and rear direction change. The position where the push rod assembly 5 stays comprises a pushing position and a vertical position, when the push rod assembly 5 stays in the pushing position, a person can push the cart to walk forwards through the push rod assembly 5, when the push rod assembly 5 rotates forwards from the pushing position to the vertical position, the person can hold the push rod assembly 5 in the vertical position to drive the seat support 3 to rotate in the horizontal plane direction, and when the seat support 3 rotates 180 degrees, the seat 60 finishes front-back reversing. Therefore, when a person operating the seat changes direction, the person only needs to rotate the push rod assembly 5 forwards in the vertical plane direction and then rotate the push rod assembly 5 in the horizontal plane direction, and the operation is very convenient and quick. More importantly, a control component is further arranged between the push rod component 5 and the seat support 3, the control component can lock the push rod component 5 in the vertical position, so that misoperation of the push rod component 5 forwards or backwards caused by unbalanced force application when torsion in the horizontal plane direction is applied to the push rod component 5 in the vertical position in the process of reversing the seat 60 is avoided, safety is ensured, the control component also ensures that the push rod component 5 can only rotate backwards to return to the pushing position after the seat 60 is reversed, the push rod component 5 is prevented from rotating forwards, misoperation is avoided, and the reliability of the use of the trolley is ensured.

As shown in fig. 17 and 18, and fig. 19 to 26, the push rod assembly 5 includes a first push rod 51 and a second push rod 52, a first connection seat 53 capable of rotating relative to the seat support 3 is connected to the lower end of the first push rod 51, a second connection seat 54 capable of rotating relative to the seat support 3 is connected to the lower end of the second push rod 52, the control assembly includes a locking position 61 provided on one side of the upper support frame 2, a first slider 62 and a second slider 63 capable of sliding therein and alternately locking with the locking position 61 when the seat 60 is reversed are provided in the seat support 3, a first abutting piece 64 capable of sliding therein and cooperating with the first slider 62 is provided in the first connection seat 53, a second abutting piece 65 capable of sliding therein and cooperating with the second slider 63 is provided in the second connection seat 54, and the following is satisfied in the reversing process of the seat 60 from front to back:

when the first sliding member 62 is disengaged from the clamping position 61, the second sliding member 63 is clamped with the clamping position 61, and the push rod assembly 5 is located at the vertical position, the first abutting member 64 can abut against the first sliding member 62 to prevent the push rod assembly 5 at the vertical position from rotating forwards, and ensure that the push rod assembly 5 at the vertical position can rotate backwards to the pushing position;

when the first sliding member 62 is separated from the clamping position 61 and the second sliding member 63 is also separated from the clamping position 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 so as to prevent the push rod assembly 5 in the vertical position from rotating back and forth;

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 located at the vertical position, the second abutting member 65 can abut against the second sliding member 63 to prevent the push rod assembly 5 at the vertical position from rotating forward, and ensure that the push rod assembly 5 at the vertical position can rotate backward to the pushing position.

As shown in fig. 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 cart forward, and in this state, the push rod assembly 5 can rotate forward to move 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, the push rod assembly 5 rotates forward to the vertical position (as shown in fig. 23 to 26), and at the same time the first abutting piece 64 contacts the first sliding piece 62, and at the same time, the second sliding piece 63 is engaged with the clamping position, and the second abutting piece 65 does not abut against the second sliding piece 63, so that the push rod assembly 5 cannot continue to rotate forward, but can rotate backward to the pushing position. When a user applies a torsion force in the horizontal direction to the vertically positioned push rod assembly 5 to enable the push rod assembly 5 to drive the seat support 3 to rotate in the horizontal direction, the second sliding piece 63 withdraws from the clamping position 61, in this state, the second sliding piece 63 moves to a position where the second abutting piece 65 can abut, so that the first abutting piece 64 prevents the push rod assembly 5 from rotating forwards, the second abutting piece 65 prevents the push rod assembly 5 from rotating backwards, namely, the first abutting piece 64 and the second abutting piece 65 clamp the push rod assembly 5 from two directions, in this state, the push rod assembly 5 cannot rotate forwards or backwards, and safety in the seat reversing process is ensured; when the user continues to rotate the push rod assembly 5 in the horizontal direction so that the seat 60 reaches the fully inverted position, the first slider 62 is engaged with the detent 61, at which time the first abutment 64 is no longer abutting the first slider 62, and the second slider 63 is still disengaged from the detent 63, and since the push rod assembly 5 is rotated 180 degrees in the horizontal direction, the second abutment 65 abutting the second slider 63 is shifted to prevent the push rod assembly 5 from rotating forward and allow the push rod assembly 5 to rotate backward to the push position. The whole process is ingenious in design, convenient to operate, safe and reliable.

As shown in fig. 17 to 27, the first slider 62 includes a first slide rod 621 capable of sliding in the seat support 3, a first engaging portion 622 capable of engaging with the engaging portion 61 is provided at one end of the first slide rod 621, a first engaging seat 623 is provided at the other end of the first slide rod 621, a first slide shaft 624 capable of sliding with respect to the seat support 3 and penetrating into the first connecting seat 53 is connected to the first engaging seat 623, the first slide shaft 624 and the first engaging seat 623 are slidably connected to each other, a first return spring 625 capable of returning the first slide rod 621 with respect to the seat support 3 is provided between the seat support 3 and the first engaging seat 623, a second return spring 626 capable of returning the first slide shaft 624 with respect to the first engaging seat 623 is further provided between the first slide shaft 624 and the first engaging seat 623, the first abutting member 64 includes a first body 641 provided in the first connecting seat 53, and a first abutting portion 641 capable of abutting against a side wall of the first slide shaft 624 is provided; the second slider 63 includes a second slide lever 631 capable of sliding in the seat support 3, a second engaging portion 632 capable of engaging with the engaging portion 61 is provided at one end of the second slide lever 631, a second engaging seat 633 is provided at the other end of the second slide lever 631, a second slide shaft 634 capable of sliding with respect to the seat support 3 and penetrating into the second connecting seat 54 is connected to the second engaging seat 633, the second slide shaft 634 and the second engaging seat 633 are slidably connected to each other, a third return spring 635 capable of returning the second slide lever 631 with respect to the seat support 3 is provided between the seat support 3 and the second engaging seat 633, a fourth return spring 636 capable of returning the second slide shaft 634 with respect to the second engaging seat 633 is further provided between the second slide shaft 634 and the second engaging seat 633, and the second abutting member 65 includes a second body 651 provided in the second connecting seat 54, a second abutting portion 652 protruding from the second body 651 and capable of abutting against a side wall of the second slide shaft 634. When the first engaging portion 622 is disengaged from the locking position, the first return spring 625 is in a compressed state, the second return spring 626 pushes the first sliding shaft 624 to a position opposite 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, and in this state, the fourth return spring 636 is in a compressed state. When the seat 60 is required to be reversed, the push rod assembly 5 is rotated forwards, and when the push rod assembly 5 is rotated to the vertical position, the first sliding shaft 621 contacts with the first abutting portion 642, the first abutting portion 642 prevents the push rod assembly 5 from continuing to rotate forwards, and meanwhile, the second abutting portion 652 still cannot abut against the second sliding shaft 631 because the second engaging portion 632 still engages with the engaging portion 61; when the push rod assembly 5 continues to rotate in the horizontal plane direction, the second clamping portion 632 is separated from the clamping position 61, and the fourth return spring 636 pushes the second sliding shaft 634 to move towards the second connecting seat 54 to a position where the second abutting portion 652 can abut, so that the push rod assembly 5 cannot rotate backwards to the pushing position, and the push rod assembly 5 in the vertical position is locked; when the push rod assembly 5 is continuously rotated until the seat 60 finishes 180 degrees of reversing, the first clamping part 622 is clamped with the clamping position 61, the first reset spring 625 is stretched, the first sliding shaft 624 is pulled to move through the first connecting seat 623, so that the first sliding shaft 624 and the first abutting part 642 are in a separated state, the first abutting part 642 does not apply any blocking to the push rod assembly 5 any more, and the second abutting part 652 which originally prevents the push rod assembly 5 from rotating backwards rotates 180 degrees in the horizontal plane direction, so that the second abutting part 652 is transformed to prevent the push rod assembly 5 from rotating forwards at this time, and the push rod assembly 5 cannot rotate forwards but can rotate backwards to the pushing position.

As shown in fig. 17 and 18, the bottom bracket 1 includes a front support assembly 11 and a rear support assembly 12 capable of rotating relative to the front support assembly 11, the position where the push rod assembly 5 stays further includes a folded position capable of rotating forward to be close to the front support assembly 11 after the locking device is unlocked, a fifth return spring 66 capable of pushing the first support 64 to slide and reset is provided between the first support 64 and the first connecting seat 53, a sixth return spring 67 capable of pushing the second support 65 to slide and reset is provided between the second support 65 and the second connecting seat 54, a first driving member 68 capable of pushing the first support 64 to slide is provided in the first push rod 51, a second driving member 69 capable of pushing the second support 65 to slide is provided in the second push rod 52, and when the first driving member 68 pushes the first support 64 and the second driving member 69 push the second support 65 to slide, the first support 64 and the first sliding shaft 624 and the second support 65 and the second sliding shaft 634 are all disengaged from each other to enable the push rod assembly 5 to rotate forward from each other. Therefore, when the stroller needs to be folded, only the first abutting piece 64 is driven to slide by the first driving piece 68 and the second abutting piece 65 is driven to slide by the second driving piece 69, so that the first abutting piece 64 and the second abutting piece 65 cannot block the first sliding piece 62 and the second sliding piece 63, and the push rod assembly 5 can continue to rotate forward when rotating forward from the pushing position to the vertical position, thereby realizing the folding of the stroller, and the design is ingenious.

As shown in fig. 17 and 18, the first push rod 51 and the second push rod 52 are provided with a telescopic push rod 55, the first driving member 68 comprises a first driving rod 681 which can be pushed by the push rod 55 to slide, a first inclined surface 682 is arranged at the lower end of the first driving rod 681, the first body 641 is provided with a first inclined surface 643 which can be matched with the first inclined surface 682 and can be pushed by the first inclined surface 682 to enable the first abutting member 64 to slide transversely when the first driving rod 681 slides downwards, and a seventh reset spring 683 which can push the first driving rod 681 to slide and reset is also arranged in the first connecting seat 53; the second driving member 69 includes a second driving rod 691 that can be pushed by the push rod 55 to slide, a second inclined sliding surface 692 is provided at the lower end of the second driving rod 691, a second inclined surface 653 that can be matched with the second inclined sliding surface 692 and can be pushed by the second inclined sliding surface 692 to slide the second abutting member 65 laterally when the second driving rod 691 slides downward is provided on the second body 651, and an eighth return spring 693 that can push the second driving rod 691 to slide and return is further provided in the second connecting seat 54.

As shown in fig. 17, the latch device 4 includes a locking hole 41 provided on the upper support frame 2, a locking groove 42 is provided on the seat support 3, a latch spline 43 capable of moving therein to simultaneously engage with the locking hole 41 and the locking groove 42 is provided in a space surrounded by the seat support 3 and the upper support frame 2, an eleventh spring 44 is further provided between the seat support 3 and the latch spline 43, a transmission member 45 capable of driving the latch spline 43 to disengage from the locking hole 41 during rotation of the push rod assembly 5 from the pushing position to the upright position is provided in the seat support 3, the transmission member 45 includes a transmission bar 451 provided in the seat support 3, one end of the transmission bar 451 abuts against the latch spline 43 through a transmission slope 452 thereon, the other end abuts against a driving portion 56 on the push rod assembly 5, a fitting slope 561 abutting against the transmission bar 451 is provided on the driving portion 56, the transmission bar 451 is pushed to slide relative to the seat support 3 when the push rod assembly 5 rotates relative to the seat support 3, and a twelfth reset spring 46 capable of resetting the transmission bar 451 is provided between the transmission bar 451 and the support 3. When the seat is required to be reversed, the push rod assembly 5 pushes the transmission bar 451 to move transversely through the matching inclined plane 561 in the forward rotation process, and the transmission inclined plane 452 on the transmission bar 451 jacks up the locking spline 43, so that the unlocking of the seat support 3 and the upper support frame 2 is realized.

As shown in fig. 3 to 12, the bottom bracket 1 comprises a front bracket assembly 11 and a rear bracket assembly 12 rotatably connected with the front bracket assembly 11, the front bracket assembly 11 comprises a front leg 111, a first connecting part 112 is arranged at the upper end of the front leg 111, a front wheel 11a is arranged at the lower end of the front leg 111, the rear bracket assembly 12 comprises a rear leg 121, a second connecting part 122 is arranged at the upper end of the rear leg 121, a rear wheel 12a is arranged at the lower end of the rear leg 121, the second connecting part 122 is rotatably connected with the first connecting part 112 around a first axis a, the upper bracket 2 is rotatably connected with the front bracket assembly 11 around a second axis B, a transmission rod 13 is arranged between the upper bracket 2 and the rear bracket assembly 12, one end of the transmission rod 13 is rotatably connected with the front side of the upper bracket 2 around a third axis C, the other end of the transmission rod 13 is rotatably connected with the rear bracket assembly 12 around a fourth axis D, an arc-shaped groove 115 capable of allowing the transmission rod 13a to move inwards is arranged on the first connecting part 112, when the trolley moves from a folded position to a position to which the front bracket assembly 5, the front bracket assembly 12 is kept close to a position from the front bracket assembly 111 to a folded position, and the front bracket assembly 11 is kept close to a position from the front bracket assembly 11 to a position, and a seat position is kept close to a position from the front bracket assembly 8 is kept close to a position, and a position is kept close to a position from the front bracket assembly is folded. The second connecting part 122 on the rear leg 121 of the baby carrier is rotationally connected with the first connecting part 112 on the front leg 111, the upper support frame 2 is rotationally connected with the front support assembly 11, and the upper support frame 2 is rotationally connected with the rear support assembly 12 through the transmission rod 13, so that the transmission rod of the whole baby carrier is less, and the folding operation is convenient.

As shown in fig. 6 to 9, the upper support frame 2 is connected to the first connecting portion 12 about the second axis B, and the transmission lever 13 is connected to the second connecting portion 22 about the fourth axis D. The first connecting portion 112 is provided with an arc groove 113 for the protruding block 84 to move in, when the cart is in an unfolded state, the pressing portion 85 stretches into the arc groove 113 to press the protruding block 84, the first connecting portion 112 is of a shell-shaped structure, the transmission rod 13 is arranged in the first connecting portion 112, and the second connecting portion 122 is embedded in the first connecting portion 112.

As shown in fig. 4 to 12, the locking device 8 includes a locking block 81 rotatably connected to a first connecting portion 112, a locking groove 82 capable of being engaged with or disengaged from the locking block 81 is provided on a second connecting portion 122, a plurality of driven teeth 811 are provided on the locking block 81, an operation block 83 capable of rotating relative to the locking block 81 is provided on the first connecting portion 112, a driving tooth 831 engaged with the driven teeth 811 and driving the locking block 81 to rotate when the operation block 83 rotates is provided on the operation block 83, a protruding block 84 is provided on the upper supporting frame 2, a pressing portion 85 capable of pressing the protruding block 84 when the cart is unfolded and capable of being disengaged from the protruding block 84 when the locking device 8 is unlocked is provided on the operation block 83, and a seventeenth reset spring 86 capable of driving the operation block 83 and the locking block 81 to rotate and reset is provided in the first connecting portion 112. Two arc-shaped channels 114 are arranged on the first connecting portion 112, two seventeenth return springs 86 are arranged in the corresponding arc-shaped channels 114, one end of each seventeenth return spring 86 abuts against the first connecting portion 112, the other end abuts against the locking block 81, one end of each seventeenth return spring abuts against the first connecting portion 112, and the other end abuts against the operating block 83. The first connecting part 112 is also internally provided with a moving column 91 capable of transversely moving in the first connecting part, the operating block 83 is provided with a clamping groove 832, the moving column 91 is provided with a clamping block 92 capable of being clamped with the clamping groove 832 to prevent the operating block 83 from rotating relative to the first connecting part 112 when the operating block 83 moves, the first connecting part 112 is also internally provided with a thirteenth reset spring 93 capable of driving the moving column 91 to reset, the first connecting part 112 is also internally provided with a sliding column 94 capable of being pushed by the moving column 91 to longitudinally slide in the first connecting part 112, the moving column 91 is provided with a clamping lock 95, the sliding column 94 is provided with a clamping hook 96 capable of clamping the clamping lock 95 to prevent the moving column 91 from resetting when the clamping block 92 is separated from the clamping groove 832, the upper end of the sliding column 94 is provided with a matching part 97 capable of being matched with the pressing part 85, the operating block 83 pushes the matching part 97 to separate the clamping hook 96 from the clamping lock 95 when the operating block 83 rotates, and the first connecting part 112 is internally provided with a fourteenth reset spring 98 capable of resetting the sliding column 94. When unlocking, the moving column 91 is pushed first, the clamping block 92 on the moving column 91 is withdrawn from the clamping groove 832 on the operating block 83, and when the clamping block 92 is withdrawn from the clamping groove 832, the clamping hook 96 on the sliding column 94 can hook the clamping lock 95 on the moving column 91, so that the moving column 91 is prevented from sliding and resetting, the unlocking state of the clamping block 92 and the clamping groove 832 is kept, at the moment, the moving column 91 can be loosened to rotate the operating block 83, the driving teeth 831 drive the driven teeth 811 in the rotating process of the operating block 83, so that the locking block 81 is separated from the locking groove 82 on the second connecting part 122, the pressing part 83 on the operating block 83 does not press the protruding block 84 any more, at the moment, the locking device is unlocked, and in the rotating process of the operating block 83, the pressing part 85 on the operating block 83 can also press the sliding column 94, and the clamping hook 96 on the sliding column 94 is separated from the clamping lock 95 on the moving column 91 in the sliding process, so that the moving column 91 slides and resets, and the design is ingenious.

As shown in fig. 17, 18 and 22, the seat support 3 is provided with a first locking seat 31 and a second locking seat 32 on both sides thereof, the locking means including a first locking means 71 provided between the first locking seat 31 and the first connection seat 53 and a second locking means 72 provided between the second locking seat 32 and the second connection seat 54; the first locking device 71 comprises a first locking groove 711 arranged on the first locking seat 31 and the first connecting seat 53, a first spline 712 which can slide in the space surrounded by the first locking seat 31 and the first connecting seat 53 and can be simultaneously clamped with the first locking groove 711 on the first locking seat 31 and the first connecting seat 53 is arranged in the space surrounded by the first locking seat 31 and the first connecting seat 53, a first pushing block 713 which can move transversely to push the first spline 712 to be separated from the first locking groove 711 on the first connecting seat 53 is arranged between the first spline 712 and the first connecting seat 53, a first sliding block 714 which can slide longitudinally in the first connecting seat 53 is also arranged in the first connecting seat 53, the first sliding block 714 and the first pushing block 713 are matched through inclined planes to enable the first sliding block 714 to push the first pushing block 713 to slide transversely, a first spline 715 which can be pulled to slide is arranged on the first sliding block 714, a ninth reset spring 716 which can push the first spline 712 is arranged between the first spline 712 and the first locking seat 31 is arranged between the first sliding block 714, and the first sliding block 714 is also arranged between the first sliding block 714 and the first sliding block 53 and the first sliding block 712 (the first spline 712 is not matched with the first spline 712 in the first sliding block 624 in a reset spring graph). The second locking device 72 may have the same structure as the first locking device 71, and will not be described herein. When the cart needs to be folded or the seat is reversed, the first sliding block 714 is pulled by the first pull cable 715, the first sliding block 714 pushes the first pushing block 713 to slide transversely in the sliding process, the first pushing block 713 pushes the first spline 712 to slide transversely, the first spline 712 is separated from the first locking groove 711 on the first connecting seat 53, at this time, the first locking device 71 is unlocked, and the second locking device 72 adopts the same unlocking mode. When the locking means is unlocked, the push rod assembly 5 can be rotated forward. Specifically, if seat reversal is required at this time, the push rod assembly 5 is rotated to the vertical position; if folding of the stroller is desired at this time, the push rod 55 can be pushed first, and the push rod 55 can push the first driving rod 681 and the second driving rod 691, so that the first abutting portion 64 and the second abutting portion 65 cannot abut against the first sliding member 62 and the second sliding member 63, ensuring that the push rod assembly 5 can rotate forward all the way to the folded position where the front legs 111 are closed, and then unlocking the locking device, thereby achieving folding of the stroller.

As shown in fig. 28 and 29, the seat 60 is detachably connected to the seat support 3, 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 latch 701 capable of sliding therein and engaging with or disengaging from the bayonet 33, the seat plate 601 is further provided with a push rod 702 capable of driving the latch 701 to disengage from the bayonet 33 when pushed, the seat plate 601 is provided with a fifteenth return spring 703 capable of driving the push rod 702 to return, the seat plate 601 is further provided with a second slider 704 capable of sliding up and down, the lower end of the second slider 704 abuts against the seat support 3, and a sixteenth return spring 705 capable of pushing the second slider 704 downward when the latch 701 is engaged with the bayonet 33 when the latch 701 is disengaged from the bayonet 33 is provided between the second slider 704 and the seat plate 601. When the seat 60 needs to be detached from the seat support 3, the push rod 702 is pushed, the push rod 702 pushes the clamping pin 701 to withdraw from the bayonet 33, once the clamping pin 701 withdraws from the bayonet 33, the sixteenth return spring 705 stretches to push the second sliding block 704 downwards, the second sliding block 704 moves downwards to slightly lift the seat 60 on the side upwards, at this time, even if the push rod 702 is loosened, the clamping pin 701 can not be engaged with the bayonet 33 any more, at this time, hands can be released to push the push rod 702 on the other side of the seat 60, and the clamping pin 701 on the other side is separated from the bayonet 33.

Claims (10)

1. A cart, characterized by: comprising the following steps: the bottom support frame (1) with a front wheel (11 a) and a rear wheel (12 a), the upper part of the bottom support frame (1) is connected with an upper support frame (2), the upper support frame (2) is connected with a seat support (3) which can rotate relative to the upper support frame in the horizontal plane direction, the seat support (3) is provided with a seat (60) for sitting, a locking device (4) which can lock the seat support (3) and the upper support frame (2) is arranged between the seat support (3) and the upper support frame (2), the seat support (3) is also connected with a push rod assembly (5) which can drive the push rod assembly to rotate in the horizontal plane direction to realize the front and back direction of the seat (60), the push rod assembly (5) is rotatably connected with the two sides of the seat support (3) so that the push rod assembly (5) can stay at the position comprising a pushing position which can push the trolley and a vertical position which can drive the seat support (3) to rotate in the horizontal plane direction, a locking device which can keep the push rod assembly (5) when locked is arranged between the push rod assembly (5) and the seat support (3), the seat support (3) and the push rod assembly (5) are also provided with a control assembly which can lock the push rod assembly (5) at the vertical position when the push rod assembly (5) drives the seat (60) to change direction forwards and backwards and can ensure that the push rod assembly (5) can only be rotated back to the pushing position when the seat (60) is changed.

2. The cart of claim 1, wherein: the push rod assembly (5) comprises a first push rod (51) and a second push rod (52), a first connecting seat (53) capable of rotating relative to the seat support (3) is connected to the lower end of the first push rod (51), a second connecting seat (54) capable of rotating relative to the seat support (3) is connected to the lower end of the second push rod (52), the control assembly comprises a clamping position (61) arranged on one side of the upper support frame (2), a first sliding part (62) and a second sliding part (63) capable of sliding in the seat support (3) and being alternately clamped with the clamping position (61) when the seat (60) is reversed are arranged in the seat support (3), a first abutting part (64) capable of sliding in the first sliding part and being matched with the first sliding part (62) is arranged in the first connecting seat (53), a second abutting part (65) capable of sliding in the second connecting seat (54) and being matched with the second sliding part (63) is arranged in the second connecting seat (54), and the second abutting part (65) is met in the front of reversing process of the seat (60).

When the first sliding piece (62) is separated from the clamping position (61), the second sliding piece (63) is clamped with the clamping position (61) and the push rod assembly (5) is positioned at the vertical position, the first abutting piece (64) can abut against the first sliding piece (62) to prevent the push rod assembly (5) at the vertical position from rotating forwards and ensure that the push rod assembly (5) at the vertical position can rotate backwards to the pushing position;

When the first sliding piece (62) is separated from the clamping position (61) and the second sliding piece (63) is also separated from the clamping position (61), the first abutting piece (64) abuts against the first sliding piece (63) and the second abutting piece (65) abuts against the second sliding piece (63) so as to prevent the push rod assembly (5) in the vertical position from rotating back and forth;

when the first sliding piece (62) is clamped with the clamping position (61), the second sliding piece (63) is separated from the clamping position (61) and the push rod assembly (5) is located at the vertical position, the second abutting piece (65) can abut against the second sliding piece (63) to prevent the push rod assembly (5) at the vertical position from rotating forwards, and the push rod assembly (5) at the vertical position can be guaranteed to rotate backwards to the pushing position.

3. The cart of claim 2, wherein: the first sliding piece (62) comprises a first sliding rod (621) capable of sliding in the seat support piece (3), a first clamping part (622) capable of being clamped with the clamping position (61) is arranged at one end of the first sliding rod (621), a first connecting seat (623) is arranged at the other end of the first sliding rod (621), a first sliding shaft (624) capable of sliding along the first sliding shaft relative to the seat support piece (623) and penetrating into the first connecting seat (53) is connected to the first connecting seat (623), the first sliding shaft (624) and the first connecting seat (623) can be in relative sliding connection, a first reset spring (625) capable of pushing the first sliding rod (621) to reset relative to the seat support piece (3) is arranged between the first sliding shaft (624) and the first connecting seat (623), a second reset spring (624) capable of pushing the first sliding shaft (624) relative to the first connecting seat (623) is arranged between the first sliding shaft (624) and the first connecting seat (624), and the first connecting seat (641) can be abutted against the first connecting seat (641);

The second sliding part (63) comprises a second sliding rod (631) capable of sliding in the seat supporting part (3), a second clamping part (632) capable of being clamped with the clamping part (61) is arranged at one end of the second sliding rod (631), a second connecting seat (633) is arranged at the other end of the second sliding rod (631), a second sliding shaft (634) capable of sliding along the second sliding shaft relative to the seat supporting part (3) and penetrating into the second connecting seat (54) is connected to the second connecting seat (633), the second sliding shaft (634) and the second connecting seat (633) can be in relative sliding connection, a third reset spring (635) capable of pushing the second sliding rod (631) to reset relative to the seat supporting part (3) is arranged between the second sliding shaft (634) and the second connecting seat (633), a fourth reset spring (636) capable of pushing the second sliding shaft (634) to slide relative to the second connecting seat (633) is further arranged between the second sliding shaft (633) and the second connecting seat (633), and the second connecting seat (651) can abut against the second body (65) and the second connecting seat (652) and the second connecting seat (65).

4. A cart according to claim 3, wherein: the bottom support frame (1) comprises a front support component (11) and a rear support component (12) which can rotate relative to the front support component (11), the position where the push rod component (5) stays also comprises a folding position which can be rotated forwards to be close to the front support component (11) after the locking device is unlocked, the first abutting piece (64) is in sliding connection with the first connecting seat (53) and is provided with a fifth return spring (66) which can push the first abutting piece (64) to return in a sliding manner, the second abutting piece (65) is in sliding connection with the second connecting seat (54) and is provided with a sixth return spring (67) which can push the second abutting piece (65) to return in a sliding manner, the first push rod (51) is internally provided with a first driving piece (68) which can push the first abutting piece (64) to slide, the second push rod (52) is internally provided with a second driving piece (69) which can push the second abutting piece (65) to slide, when the first driving piece (68) pushes the first abutting piece (64) and the second abutting piece (69) to slide, the first abutting piece (64) and the first sliding shaft (624) and the second abutting piece (65) and the second sliding shaft (634) are all in a mutually separated state all the time so that the push rod assembly (5) can rotate forwards from the pushing position to the folding position.

5. The cart of claim 4, wherein: the first push rod (51) and the second push rod (52) are connected with a telescopic push rod (55), the first driving piece (68) comprises a first driving rod (681) which can be pushed by the push rod (55) to slide, a first inclined sliding surface (682) is arranged at the lower end of the first driving rod (681), a first inclined surface (643) which can be matched with the first inclined sliding surface (682) and can be pushed by the first inclined sliding surface (682) to enable the first abutting piece (64) to slide transversely when the first driving rod (681) slides downwards is arranged on the first body (641), and a seventh reset spring (683) which can push the first driving rod (681) to reset in a sliding manner is also arranged in the first connecting seat (53); the second driving piece (69) comprises a second driving rod (691) which can be pushed by the hand push rod (55) to slide, a second inclined sliding surface (692) is arranged at the lower end of the second driving rod (691), a second inclined surface (653) which can be matched with the second inclined sliding surface (692) and can be pushed by the second inclined sliding surface (692) to enable the second abutting piece (65) to slide transversely when the second driving rod (691) slides downwards is arranged on the second body (651), and an eighth reset spring (693) which can push the second driving rod (691) to slide and reset is further arranged in the second connecting seat (54).

6. The cart of claim 5, wherein: the locking device (4) comprises a locking hole (41) arranged on the upper supporting frame (2), a locking groove (42) is arranged on the seat supporting piece (3), a locking spline (43) which can move in the space surrounded by the seat supporting piece (3) and the upper supporting frame (2) and is simultaneously clamped with the locking hole (41) and the locking groove (42) is arranged in the space, an eleventh spring (44) is further arranged between the seat supporting piece (3) and the locking spline (43), a transmission piece (45) which can drive the locking spline (43) to be separated from the locking hole (41) in the process of rotating the push rod assembly (5) from the pushing position to the vertical position is arranged in the seat supporting piece (3), the transmission piece (45) comprises a transmission bar (451) arranged in the seat supporting piece (3), one end of the transmission bar (451) is abutted against the locking spline (43) through a transmission inclined surface (452) arranged on the transmission bar, the other end of the transmission bar (451) is abutted against a driving part (56) on the push rod assembly (5), and when the driving part (56) is matched with the transmission bar (451) in a rotating way, the matching inclined plane (561) pushes the transmission bar (451) to enable the transmission bar (451) to slide relative to the seat support (3), and a twelfth reset spring (46) capable of resetting the transmission bar (451) is arranged between the transmission bar (451) and the seat support (3).

7. The cart of any of claims 1-6, wherein: the bottom support frame (1) comprises a front support assembly (11) and a rear support assembly (12) rotatably connected with the front support assembly (11), the front support assembly (11) comprises a front leg (111), the upper end of the front leg (111) is provided with a first connecting part (112), a front wheel (11 a) is arranged at the lower end of the front leg (111), the rear support assembly (12) comprises a rear leg (121), the upper end of the rear leg (121) is provided with a second connecting part (122), a rear wheel (12 a) is arranged at the lower end of the rear leg (121), the second connecting part (122) is rotatably connected with the first connecting part (112) around a first axis (A), the upper support frame (2) is rotatably connected with the front support assembly (11) around a second axis (B), a transmission rod (13) is arranged between the upper support frame (2) and the rear support assembly (12), one end of the transmission rod (13) is rotatably connected with the upper support frame (2) around a fourth axis (C) around a third axis (13) and the other end of the transmission rod (13) is rotatably connected with the upper support frame (12) around a fourth axis (C), and first connecting portion (112) on be equipped with arc groove (115) that can supply transmission shaft (13 a) to move in, when the shallow moves from the expansion position to folding position, push rod subassembly (5), upper portion support frame (2) and seat (60) draw together on front leg (111) from the front side of front leg (111), back prop subassembly (12) draw together on front leg (111) from the rear side of front leg (111), front prop subassembly (11) and back prop and be equipped with between subassembly (12) and make shallow keep locking device (8) of expansion state.

8. The cart of claim 7, wherein: the locking device (8) comprises a locking block (81) which is rotationally connected to a first connecting portion (112), a locking groove (82) which can be clamped with or separated from the locking block (81) is formed in a second connecting portion (122), a plurality of driven teeth (811) are formed in the locking block (81), an operation block (83) which can rotate relative to the first connecting portion (112) is further arranged on the first connecting portion (112), driving teeth (831) which are matched with the driven teeth (811) and drive the locking block (81) to rotate when the operation block (83) rotates are arranged on the operation block (83), a protruding block (84) is arranged on the upper supporting frame (2), a pressing portion (85) which can press the protruding block (84) when the locking device (8) is in a unfolded state and can separate from the protruding block (84) is arranged on the operation block (83), and a seventeenth reset spring (86) which can drive the operation block (83) and the locking block (81) to rotate is further arranged in the first connecting portion (112).

9. The cart of claim 8, wherein: the first connecting part (112) is internally provided with a moving column (91) capable of transversely moving in the first connecting part, the operating block (83) is provided with a clamping groove (832), the moving column (91) is provided with a clamping block (92) which can be clamped with the clamping groove (832) to prevent the operating block (83) from rotating relative to the first connecting part (112) when the operating block moves, the first connecting part (112) is internally provided with a thirteenth reset spring (93) which can drive the moving column (91) to reset, the first connecting part (112) is internally provided with a sliding column (94) which can be pushed by the moving column (91) to longitudinally slide in the first connecting part (112), the moving column (91) is provided with a clamping lock part (95), the sliding column (94) is provided with a clamping hook (96) which can be hooked with the clamping lock part (95) to prevent the moving column (91) from resetting when the clamping block (92) is separated from the clamping groove (832), the upper end of the sliding column (94) is provided with a pushing part (97) which can be matched with the clamping block (85) when the sliding column (85) is separated from the sliding column (95) when the sliding column (85), a fourteenth return spring (98) capable of returning the slide column (94) is further arranged in the first connecting part (112).

10. The cart of any of claims 1-6, wherein: the seat (60) is detachably connected to the seat support (3), the seat support (3) is provided with a bayonet (33), the seat (60) comprises a seat board (601) and a backrest (602) connected to the seat board (601), the seat board (601) is provided with a clamping pin (701) which can slide in the seat board and can be clamped with or separated from the bayonet (33), the seat board (601) is also provided with a push rod (702) which can drive the clamping pin (701) to separate from the bayonet (33) when being pushed, the seat board (601) is also internally provided with a fifteenth return spring (703) which can drive the push rod (702) to return, the seat board (601) is also internally provided with a second sliding block (704) which can slide up and down, the lower end of the second sliding block (704) is propped against the seat support (3), and the clamping pin (705) and the seat board (601) are provided with a push rod (702) which can drive the clamping pin (701) to separate from the bayonet (33) when being clamped with the bayonet (33) and the second sliding block (704) can move downwards when being compressed.

Images