CN219821540U - Folding structure of cart - Google Patents

Abstract

The utility model discloses a folding structure of a cart, which comprises the following components: the two frame mechanisms are arranged at intervals left and right, each frame mechanism comprises a front bracket assembly, a rear bracket assembly and a push rod assembly, the rear bracket assembly is arranged between the front bracket assembly and the push rod assembly, and the upper end of the rear bracket assembly is respectively pivoted with the upper end of the front bracket assembly and the lower end of the push rod assembly; the left end or the right end of the folding mechanism is respectively connected with the rear bracket assembly, the front bracket assembly and the push rod assembly, and the folding mechanism can slide along the rear bracket assembly. The folding cart is smaller in volume after being folded through front-back folding and left-right folding, simple in structure and convenient to store and carry.

Description

Folding structure of cart

Technical Field

The utility model relates to the technical field of baby strollers, in particular to a folding structure of a stroller.

Background

The existing baby carriage frame has a complex folding structure, can be folded back and forth or left and right, has a large volume after folding, and is inconvenient to store and carry.

Disclosure of Invention

The utility model aims to solve one of the problems in the prior related art to at least a certain extent, and therefore, the utility model provides a folding structure of a cart, which enables the folded volume of the cart to be smaller, has a simple structure and is more convenient to store and carry through front-back folding and left-right folding.

According to the folding structure of the cart, the folding structure is realized through the following technical scheme:

a folding structure of a cart, comprising: the two frame mechanisms are arranged at intervals left and right, each frame mechanism comprises a front bracket assembly, a rear bracket assembly and a push rod assembly, the rear bracket assembly is arranged between the front bracket assembly and the push rod assembly, and the upper end of the rear bracket assembly is respectively pivoted with the upper end of the front bracket assembly and the lower end of the push rod assembly; the left end or the right end of the folding mechanism is respectively connected with the rear bracket assembly, the front bracket assembly and the push rod assembly, and the folding mechanism can slide along the rear bracket assembly.

In some embodiments, the folding mechanism comprises a sliding part, a folding assembly and a connecting rod assembly, wherein the sliding part is connected with the rear bracket assembly in a sliding way, the sliding part is respectively pivoted with the front bracket assembly and the push rod assembly through the connecting rod assembly, and the left end or the right end of the folding assembly is respectively pivoted with the upper end of the rear bracket assembly and the sliding part.

In some embodiments, the folding assembly comprises at least one set of intersecting and pivotally connected scissor linkages comprising two intersecting and pivotally connected scissor rods; the sliding piece is pivoted with the lower end of the shearing rod close to the sliding piece, and the upper end of the rear bracket component is pivoted with the upper end of the shearing rod close to the rear bracket component.

In some embodiments, the rear bracket assembly includes a bracket joint and a rear leg, the bracket joint being connected to an upper end of the rear leg, the bracket joint being pivotally connected to an upper end of the front bracket assembly and a lower end of the push rod assembly, respectively; the upper side of the left end or the right end of the folding mechanism is pivoted with the bracket joint, and the lower side of the folding mechanism is connected with the rear support leg in a sliding manner.

In some embodiments, the rear leg comprises an upper stand and a lower stand, the upper end of the upper stand is connected with the bracket joint, and the lower end is telescopically connected with the lower stand.

In some embodiments, a locking mechanism is provided between the rear bracket assembly and the slider of the folding mechanism, the rear bracket assembly being locked or unlocked with the slider by the locking mechanism.

In some embodiments, the push rod assembly comprises a lower push rod and an upper push rod, wherein the lower end of the lower push rod is pivoted with a bracket joint of the rear bracket assembly, and the upper end of the lower push rod is rotatably connected or telescopically connected with the upper push rod.

In some embodiments, the push-up bar is a telescoping bar.

In some embodiments, a handle mechanism is pivotally connected between the upper ends of the two push rod assemblies, or a grip is connected to the upper end of each push rod assembly.

In some embodiments, the handle mechanism comprises a handle joint and two holding parts, the handle joint is arranged between the two holding parts, and the upper end of the push rod assembly is pivoted with the handle joint through the holding parts.

Compared with the prior art, the utility model at least comprises the following beneficial effects:

according to the folding structure of the cart, the two frame mechanisms comprise the front support assembly, the rear support assembly and the push rod assembly, the front support assembly and the push rod assembly can rotate relative to the rear support assembly, the folding mechanism capable of being folded left and right is connected between the two frame mechanisms, and the folding mechanism can be linked with the front support assembly and the push rod assembly when sliding along the rear support assembly, so that the cart can be folded back and forth and folded left and right, the folded volume is smaller, the structure is simple, and the storage and the carrying are more convenient.

Drawings

Fig. 1 is a schematic structural view of a cart in an unfolded state in embodiment 1 of the present utility model;

fig. 2 is a right side view of the cart in an unfolded state in embodiment 1 of the present utility model;

fig. 3 is a schematic structural view of the cart in an intermediate state in embodiment 1 of the present utility model;

fig. 4 is a right side view of the cart in an intermediate state in embodiment 1 of the present utility model;

fig. 5 is a schematic diagram showing a structure of the cart in a folded state in embodiment 1 of the present utility model;

fig. 6 is a schematic diagram II of the structure of the cart in a folded state in embodiment 1 of the present utility model;

fig. 7 is a right side view of the cart in a folded state in embodiment 1 of the present utility model;

fig. 8 is a schematic view showing the structure of the cart in the unfolded state in embodiment 2 of the present utility model.

In the figure: 1-frame mechanism, 11-front bracket assembly, 111-front leg, 112-front wheelset, 12-rear bracket assembly, 121-bracket joint, 122-rear leg, 1221-upper riser, 1222-lower riser, 123-rear wheelset, 13-push rod assembly, 131-lower push rod, 132-upper push rod, 133-push rod joint, 134-handle joint;

the folding mechanism comprises a 2-folding mechanism, a 21-sliding part, a 211-front boss, a 212-rear boss, a 213-inner boss, a 22-folding assembly, a 221-shearing rod, a 23-connecting rod assembly, a 231-front connecting rod and a 232-rear connecting rod;

3-handle assembly, 31-grip, 32-handle joint, 321-unlock button.

Detailed Description

The following examples illustrate the utility model, but the utility model is not limited to these examples. Modifications and equivalents of some of the technical features of the specific embodiments of the present utility model may be made without departing from the spirit of the present utility model, and they are all included in the scope of the claimed utility model.

Example 1

Referring to fig. 1-2, the present embodiment provides a folding structure of a cart, including two frame mechanisms 1 and a folding mechanism 2, where the two frame mechanisms 1 are arranged at intervals along a left-right direction, each frame mechanism 1 includes a front support component 11, a rear support component 12 and a push rod component 13, the rear support component 12 is disposed between the front support component 11 and the push rod component 13, and an upper end of the rear support component 12 is pivoted with an upper end of the front support component 11 and a lower end of the push rod component 13 respectively, so that the front support component 11 and the push rod component 13 can both rotate relative to the rear support component 12, and it is ensured that the front support component 11 and the push rod component 13 can both fold towards the rear support component 12 or both deviate from the rear support component 12 to realize front-rear folding of the cart.

The folding mechanism 2 is arranged between the two frame components 1, and the two opposite ends of the folding mechanism 2 are respectively connected with the two frame components 1, and the folding mechanism 2 can be folded or unfolded along the left-right direction, so that when the folding mechanism 2 is switched between folding and unfolding, the two frame components 1 can be close to each other to be folded or are opposite to each other to be unfolded, and the left-right folding of the trolley is realized. In this embodiment, the left end or the right end of the folding mechanism 2 is respectively connected with the rear bracket assembly 12, the front bracket assembly 11 and the push rod assembly 13, that is, the left end of the folding mechanism 2 is respectively connected with the rear bracket assembly 12, the front bracket assembly 11 and the push rod assembly 13 on the left side, and the right end of the folding mechanism 2 is respectively connected with the rear bracket assembly 12, the front bracket assembly 11 and the push rod assembly 13 on the right side; in addition, the folding mechanism 2 is able to slide up or down along the two rear bracket assemblies 12.

Referring to fig. 3-4, when the folding mechanism 2 slides down along the rear bracket assembly 12, the folding mechanism 2 can push the two frame assemblies 1 to close and fold, and simultaneously, the front bracket assembly 11 and the push rod assembly 13 are linked to pull the front bracket assembly 11 and the push rod assembly 13 to fold towards the rear bracket assembly 12, so that the front and rear folding of the cart is realized; when the folding mechanism 2 slides downwards to the lowest point, in order to further reduce the folded volume of the cart and reduce the occupied space, the folding mechanism 2 is further pushed to fold towards the middle along the left-right direction, so that the two frame assemblies 1 fold towards the middle, the left-right folding of the cart is realized, and meanwhile, the width of the cart in the left-right direction is smaller, and referring to fig. 5-7.

When the folding mechanism 2 slides upwards along the rear bracket assembly 12, the folding mechanism 2 can push the two frame assemblies 1 to be unfolded away from each other, and simultaneously, the front bracket assembly 11 and the push rod assembly 13 are linked to push the front bracket assembly 11 and the push rod assembly 13 to be unfolded away from the rear bracket assembly 12; or when the front bracket component 11 and the push rod component 13 deviate from the rear bracket component 12 to be unfolded, the folding mechanism 2 can be linked to drive the folding mechanism 2 to slide upwards along the rear bracket component 12, and the folding mechanism 2 pushes the two frame components 1 to be unfolded reversely when sliding upwards so as to realize the front-back and left-right direction unfolding of the cart, and the folding mechanism is referred to fig. 1-2.

Referring to fig. 1-3, the front bracket assembly 11 includes a front leg 111 and a front wheel set 112, and the upper end of the front leg 111 is pivotally connected to a bracket joint 121 of the rear bracket assembly 12 to enable the front leg 111 to rotate relative to the rear bracket assembly 12. The front leg 111 has a front wheel set 112 connected to the lower end thereof, and the front wheel set 112 includes at least one moving wheel to ensure smooth movement of the front bracket assembly 11 along the ground.

Referring to fig. 1-3, the rear bracket assembly 12 includes a bracket joint 121 and a rear leg 122, in this embodiment, the bracket joint 121 includes a transverse section and a vertical section fixedly connected in a T shape, and the vertical section of the bracket joint 121 is cooperatively inserted with the upper end of the rear leg 122 so that the bracket joint 121 is connected to the upper end of the rear leg 122, and the bracket joint 121 forms the upper end of the rear bracket assembly 12. The front and rear ends of the transverse section of the bracket joint 121 are respectively pivoted to the upper ends of the front legs 111 of the front bracket assembly 11 and the lower ends of the lower push rods 131 of the push rod assemblies 13, so that the front bracket assembly 11 and the push rod assemblies 13 can be folded and unfolded toward the rear legs 122 or away from the rear legs 122 around the bracket joint 121. The upper sides of the left and right ends of the folding mechanism 2 are respectively pivoted with two bracket joints 121, and the lower sides of the left and right ends of the folding mechanism 2 are slidingly connected with two rear support legs 122, so that the upper sides of the folding mechanism 2 are reliably connected between the two bracket joints 121, and the lower sides can slide upwards or downwards along the two rear support legs 122. Optionally, in order to facilitate the pivoting of the folding mechanism 2 by the bracket joint 121, a connection (not shown) extending towards the folding mechanism 2 is integrally formed in a lateral section of the bracket joint 121, and is configured to pivot with the upper side of the folding assembly 22 of the folding mechanism 2.

In order to make the height of the rear bracket assembly 12 adjustable, the present embodiment designs the rear leg 122 as a telescopic structure, that is, the rear leg 122 includes an upper stand 1221 and a lower stand 1222, and the upper end of the upper stand 1221 is connected to the vertical section of the bracket joint 121, and the lower end is telescopically connected to the lower stand 1222. When the cart is folded back and forth and left and right, the lower stand 1222 is pushed to extend upwards along the upper stand 1221, so as to reduce the height of the rear bracket assembly 12 after being folded, and further make the height of the cart after being fully folded smaller; conversely, when the cart is fully deployed, the lower stand 1222 is pushed to extend downwardly along the upper stand 1221, increasing the height of the stand assembly 12 after deployment, thereby ensuring that the stand assembly 12 reliably contacts the ground.

To ensure that the rear bracket assembly 12 can move smoothly along the ground, the rear bracket assembly 12 further comprises a rear wheel set 123, wherein the rear wheel set 123 is fixedly connected to the lower end of the lower stand 1222, and at least comprises one moving wheel, so that the lower stand 1222 can synchronously drive the rear wheel set 123 to move upwards or downwards when the lower stand 1222 stretches upwards or downwards along the upper stand 1221.

Referring to fig. 1-3, the push rod assembly 13 includes a lower push rod 131 and an upper push rod 132, the lower end of the lower push rod 131 being pivotally connected to the bracket joint 121 of the rear bracket assembly 12 such that the lower push rod 131 can be folded about the bracket joint 121 toward the rear leg 122 of the bracket assembly 12 or unfolded away from the rear leg 122. The upper end of the lower push rod 131 is rotatably connected or telescopically connected with the upper push rod 132. Therefore, the push rod assembly 13 not only can be folded towards the rear supporting leg 122 or unfolded away from the rear supporting leg 122, but also has adjustable height, and the push rod assembly 13 is ensured to be smaller in height after being fully folded or folded by telescoping or rotating the lower push rod 131 and the upper push rod 132, so that the height of the cart 22 after being fully folded or folded is further reduced, and the push rod assembly 13 is ensured to be convenient for a user to push or pull the cart after being unfolded. Optionally, the upper push rod 132 is a telescopic rod, so that the height of the upper push rod 132 itself is adjustable, which is beneficial to further shortening the height of the push rod assembly 13 and the cart after being completely folded or retracted.

In this embodiment, the lower pushrod 131 is rotatably connected to the upper pushrod 132, and the pushrod assembly 13 further includes a pushrod joint 133, and the upper end of the lower pushrod 131 is rotatably connected to the lower end of the upper pushrod 132 through the pushrod joint 133, so that the lower pushrod 131 and the upper pushrod 132 can be folded or unfolded around the pushrod joint 133. In addition, in order to facilitate the connection of the push rod assembly 13 to the handle mechanism 3 or the grip 31 as a handle, the push rod assembly 13 further includes a handle connector 134, and the handle connector 134 is fixedly connected to the upper end of the upper push rod 132.

Referring to fig. 1 to 4, the folding mechanism 2 includes a slider 21, a folding assembly 22 and a link assembly 23, the slider 21 is slidably connected to the rear leg 122 of the rear bracket assembly 12, and the slider 21 is pivotally connected to the front bracket assembly 11 and the push rod assembly 13 through the link assembly 23, respectively, so that the front bracket assembly 11 and the push rod assembly 13 can be reliably linked by the link assembly 23 when the slider 21 slides down or up along the rear leg 122. The upper sides of the left end and the right end of the folding component 22 are pivoted with the upper ends of the rear bracket components 12, namely the upper sides of the left end and the right end of the folding component 22 are pivoted with bracket joints 121 of the two rear bracket components 12; and the lower sides of the left and right ends of the folding assembly 22 are respectively pivoted with two sliding members 21, that is, the lower sides of the left or right ends of the folding assembly 22 are slidably connected with the rear legs 122 through the sliding members 21.

When the slider 2 slides down or up the rear leg 122 of the rear bracket assembly 12, the folding assembly 22, the front bracket assembly 11 and the push rod assembly 13 can be linked to pull the lower side of the folding assembly 22 to slide along the slider 2 so that the two frame mechanisms 1 move closer to or away from each other while pulling the front bracket assembly 11 and the push rod assembly 13 to retract toward the rear bracket assembly 12 or expand away from the rear bracket assembly 12. When the sliding piece 2 slides downwards to the lowest point, the folding assembly 22 can be pushed to fold towards the middle along the left-right direction, so that the width of the trolley in the left-right direction is smaller; when the slider 2 slides up to the highest point, the slider 2 can be locked to the rear leg 122 by a locking mechanism (not shown in the drawing), so that the slider 2 is reliably retained and fixed to the rear leg 122, thereby ensuring that the stroller is reliably maintained in the fully unfolded state.

Referring to fig. 1-2, the sliding member 21 is slidably sleeved outside the rear leg 122 of the rear bracket assembly 12, the sliding member 21 is fixedly provided with a front boss 211 extending forward, a rear boss 212 extending backward, and an inner boss 213 extending toward the folding assembly 22, the front boss 211 and the rear boss 212 are mirror images, the inner boss 213 is located between the front boss 211 and the rear boss 212, and the inner boss 213 is pivoted to the lower side of the left end or the right end of the folding assembly 22.

Referring to fig. 1, the folding assembly 22 includes at least one pair of intersecting and shearing linkages (not shown), in this embodiment, two pairs of intersecting and shearing linkages are arranged side by side in the left-right direction, and adjacent intersecting and shearing linkages are pivotally connected end-to-end, and each pair of intersecting and pivotally connected two intersecting and pivotally connected shearing bars 221. The inner boss 213 of the sliding member 21 is pivoted to the lower end near the shearing rod 221 thereof, and the upper end of the rear bracket assembly 12 is pivoted to the upper end near the shearing rod 221 thereof, i.e., the connecting portion of the bracket joint 121 is pivoted to the upper end near the shearing rod 221 thereof.

Referring to fig. 2, the link assembly 23 includes a front link 231 and a rear link 232, and the front leg 111 of the front bracket assembly 11 is pivotally coupled to the front boss 211 of the slider 21 through the front link 231, and the lower push rod 131 of the push rod assembly 13 is pivotally coupled to the rear boss 212 of the slider 21 through the rear link 232.

Optionally, a locking mechanism (not shown) is further included, and the locking mechanism is disposed between the rear leg 122 of the rear bracket assembly 12 and the slider 21 of the folding mechanism 2, and the rear leg 122 of the rear bracket assembly 12 is locked to or unlocked from the slider 21 by the locking mechanism. When the slider 21 is unlocked from the rear leg 122, the slider 21 can slide down along the rear leg 122; when the slider 21 slides up along the rear leg 122 to the highest point, the slider 21 can be locked with the rear leg 122 by a locking mechanism to achieve a secure, limit-fixing of the slider 21 on the rear leg 122. Since the latch mechanism is a common latch mechanism in a stroller or pram, this is not specifically illustrated or limited.

Referring to fig. 1-3, the folding and unfolding device further comprises a handle mechanism 3, wherein the handle mechanism 3 is pivoted between the upper ends of the two push rod assemblies 13, so that the left push rod assembly and the right push rod assembly 13 are connected into a whole through the handle mechanism 3, a user can push or pull the trolley more conveniently, and meanwhile, the handle mechanism 3 is configured to be pivoted with the push rod assemblies 13, so that the handle mechanism 3 can rotate relative to the support mechanism 1 or the push rod assemblies 13, and folding of the handle mechanism 3 are facilitated.

The handle mechanism 3 comprises a handle joint 32 and two holding parts 31, the handle joint 32 is arranged between the two holding parts 31, and the upper end of the push rod assembly 13 is pivoted with the handle joint 32 through the holding parts 31. Therefore, the width of the trolley in the left-right direction is reduced by folding the two holding parts 31 towards the folding mechanism 2, so that the folding mechanism 1 is convenient for linking the two frame mechanisms 1 to be folded in the middle; by unfolding the two grip portions 31 away from the folding mechanism 2, it is convenient for the user to push or pull the cart while the cart is reliably maintained in the unfolded state.

Optionally, in order to fix each grip portion 31 to the handle joint 32 in a limited manner, a locking member (not shown) is provided between the handle joint 32 and the grip portion 31, and the handle joint 32 and the grip portion 31 are locked or unlocked by the locking member. In order to facilitate releasing the locking relationship between the handle joint 32 and the grip portion 31, an unlocking button 321 is provided on the handle joint 32, and the locking relationship between the handle joint 32 and the grip portion 31 can be released by pressing the unlocking button 321 toward the inside of the handle joint 32, and after releasing the locking relationship, the grip portion 31 can drive the handle joint 32 to fold or bend toward the folding mechanism 2, so that the handle mechanism 3 has a V shape.

The folding principle of the cart according to the present embodiment is described below with reference to fig. 1 to 7:

when the cart is folded, the unlocking button 321 is required to be pressed firstly to unlock the handle mechanism 3, and the two holding parts 31 drive the handle joints 32 to bend towards the folding mechanism 2; then, the locking relation between the folding mechanism 2 and the rear support leg assembly 12 is released, namely, the locking relation between the sliding piece 21 and the rear support leg 122 is released, and the sliding piece 21 is pushed to slide downwards so as to link the folding assembly 22, the front bracket assembly 11 and the push rod assembly 13, so that the front, the rear, the left and the right of the cart are folded; when the sliding member 2 slides down to the lowest point, the folding assembly 22 and the two frame assemblies 1 are pushed to retract to the middle in the left-right direction, so that the width of the trolley in the left-right direction is smaller, and before or after retracting to the middle, the lower stand 1222 stretches up along the upper stand 1221 to drive the rear wheel group 123 to stretch up, so that the height is smaller.

Before, simultaneously with, or after releasing the locking relationship of the folding mechanism 2 and the rear foot assembly 12, or after the two frame assemblies 1 are folded toward the middle, the push rod assembly 13 is retracted and folded downward to reduce the height of the push rod assembly 13 after folding.

Example 2

Referring to fig. 8, this embodiment is different from embodiment 1 in that the handle mechanism 3 is omitted, and at this time, the upper ends of the two push rod assemblies 13 are independent and separated from each other. In this embodiment, in order to facilitate the pushing and pulling of the cart by the user, a holding portion 31 may be connected to the upper end of each push rod assembly 13, that is, the upper end of the upper push rod 133 is connected to a holding portion 31 through a handle connector 134, where the holding portion 31 may be fixedly connected to the handle connector 134 or may rotate relative to the handle connector 134, so that the holding portion 31 may be folded by rotating around the handle connector 134. Of course, the handle connector 134 may be omitted, and the upper end of the upper push rod 133 may be directly connected to a holding portion 31.

Compared with embodiment 1, the cart of this embodiment has simpler structure, fewer assembly steps and lower cost.

What has been described above is merely some embodiments of the present utility model. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the utility model.

Claims (10)

1. The utility model provides a folding structure of shallow which characterized in that includes:

the two frame mechanisms (1) are arranged at intervals left and right, each frame mechanism (1) comprises a front bracket assembly (11), a rear bracket assembly (12) and a push rod assembly (13), the rear bracket assembly (12) is arranged between the front bracket assembly (11) and the push rod assembly (13), and the upper ends of the rear bracket assemblies (12) are respectively pivoted with the upper ends of the front bracket assemblies (11) and the lower ends of the push rod assemblies (13);

the folding mechanism (2), the left end or the right-hand member of folding mechanism (2) is connected respectively back support subassembly (12), preceding support subassembly (11) and push rod subassembly (13), and folding mechanism (2) can follow back support subassembly (12) slides.

2. The folding structure of the cart according to claim 1, wherein the folding mechanism (2) comprises a sliding member (21), a folding assembly (22) and a connecting rod assembly (23), the sliding member (21) is slidably connected with the rear bracket assembly (12), the sliding member (21) is respectively pivoted with the front bracket assembly (11) and the push rod assembly (13) through the connecting rod assembly (23), and the left end or the right end of the folding assembly (22) is respectively pivoted with the upper end of the rear bracket assembly (12) and the sliding member (21).

3. A folding structure of a trolley according to claim 2, characterized in that said folding assembly (22) comprises at least one set of intersecting and pivoted cutting bars (221); the sliding piece (21) is pivoted with the lower end close to the shearing rod (221), and the upper end of the rear bracket component (12) is pivoted with the upper end close to the shearing rod (221).

4. The folding structure of a cart according to claim 1, wherein said rear bracket assembly (12) comprises a bracket joint (121) and a rear leg (122), said bracket joint (121) being connected to an upper end of said rear leg (122), said bracket joint (121) being pivotally connected to an upper end of said front bracket assembly (11) and to a lower end of said push rod assembly (13), respectively; the upper side of the left end or the right end of the folding mechanism (2) is pivoted with the bracket joint (121), and the lower side of the folding mechanism is connected with the rear support leg (122) in a sliding way.

5. The folding structure of a cart according to claim 4, wherein the rear leg (122) comprises an upper stand (1221) and a lower stand (1222), the upper end of the upper stand (1221) is connected to the bracket joint (121), and the lower end is telescopically connected to the lower stand (1222).

6. A folding structure of a trolley according to any one of claims 1-5, characterized in that a locking mechanism is provided between the rear bracket assembly (12) and the slider (21) of the folding mechanism (2), by means of which locking mechanism the rear bracket assembly (12) and the slider (21) are locked or unlocked.

7. The folding structure of a cart according to claim 1, wherein the push rod assembly (13) includes a lower push rod (131) and an upper push rod (132), the lower end of the lower push rod (131) is pivotally connected to a bracket joint (121) of the rear bracket assembly (12), and the upper end of the lower push rod (131) is rotatably connected to or telescopically connected to the upper push rod (132).

8. The folding structure of a cart according to claim 7, wherein said push-up rod (132) is a telescopic rod.

9. A pushchair folding structure according to claim 1, 7 or 8, wherein a handle mechanism (3) is pivotally connected between the upper ends of the push rod assemblies (13), or a gripping portion (31) is connected to the upper end of each push rod assembly (13).

10. The folding structure of a cart according to claim 9, wherein the handle mechanism (3) comprises a handle joint (32) and two holding parts (31), the handle joint (32) is disposed between the two holding parts (31), and the upper end of the push rod assembly (13) is pivoted with the handle joint (32) through the holding parts (31).