CN118810881A

CN118810881A - A foldable trailer

Info

Publication number: CN118810881A
Application number: CN202411144938.0A
Authority: CN
Inventors: 张相山
Original assignee: Jinhua Mutao Leisure Products Co ltd
Current assignee: Jinhua Mutao Leisure Products Co ltd
Priority date: 2024-08-20
Filing date: 2024-08-20
Publication date: 2024-10-22
Also published as: JP7782879B1

Abstract

The invention relates to a folding short trailer, which comprises four telescopic upright posts arranged at rectangular intervals and at least two opposite side folding mechanisms, wherein two ends of each side folding mechanism are respectively hinged to two adjacent telescopic upright posts. In the folding process of the folding short trailer, the side folding mechanism drives the telescopic upright post connected with the folding short trailer to shrink and shorten; in the unfolding process of the folding short trailer, the side folding mechanism drives the telescopic upright post connected with the folding short trailer to extend; the height of the folding short trailer in the folded state is smaller than that in the unfolded state. According to the folding type telescopic trailer, the telescopic stand column is arranged, and the folding mechanism is utilized to drive the telescopic stand column to shorten or stretch in the folding or unfolding process of the trailer, so that the space of the cloth bag arranged at the top of the telescopic stand column is enlarged after the folding type telescopic trailer is unfolded. Meanwhile, the telescopic upright post is shortened after the folding short trailer is folded, so that the occupied space is small, and the telescopic upright post is convenient to carry and transport.

Description

Folding short trailer

Technical Field

The invention relates to the technical field of folding trailers, in particular to a folding shorter trailer.

Background

In daily life and production, luggage, articles and the like often need to be carried, and a trailer tool is often used in the carrying process. The trailer tool is widely applied when carrying things because of the characteristics of convenient pushing, time saving and labor saving. In order to facilitate the storage of the trailer tool, the trailer tool is designed into a foldable structure, so that the trailer tool is very light and convenient to carry, and can be placed on a vehicle after being folded.

However, existing folding trailers have a smaller volume in the unfolded state and fewer items to be stored; the volume is larger in the folded state, the occupied space is larger, and the folding type automobile trunk is particularly inconvenient to fold and store in a place with limited space like an automobile trunk, so that the use experience of a user is seriously influenced.

In a conventional folding trailer, due to the structural limitation of the folding mechanism, the height of the folding trailer is significantly higher than that of the folding trailer in the unfolded state, which results in a large occupied area when the folding trailer is stored. If only the reduction of the footprint of the trailer in stowage is considered, the capacity of the trailer in the deployed state must be sacrificed. Thus, the capacity of the trailer in the unfolded state and the occupied area of the trailer in the stored state are mutually restricted, and the problems of the person skilled in the art are studied.

Disclosure of Invention

First, the technical problem to be solved

In view of the foregoing drawbacks and deficiencies of the prior art, the present invention provides a collapsible trailer that solves the technical problems of a collapsible trailer having a smaller volume in an expanded state and a larger volume in a collapsed state.

(II) technical scheme

In order to achieve the above purpose, the folding and dwarfing trailer comprises four telescopic upright posts which are arranged at intervals in a rectangular shape and at least two opposite side folding mechanisms, wherein two ends of each side folding mechanism are respectively hinged with two adjacent telescopic upright posts;

In the folding process of the folding short trailer, the side folding mechanism drives the telescopic upright post connected with the folding short trailer to shrink and shorten; the side folding mechanism drives the telescopic upright post connected with the folding short trailer to extend in the unfolding process of the folding short trailer; the height of the folding short trailer in the folded state is smaller than that in the unfolded state.

Optionally, the telescopic upright comprises a lifting rod;

the top of the lifting rod is the top of the telescopic upright post, and both ends of the side folding mechanism are provided with linkage ends hinged with the lifting rod corresponding to the telescopic upright post;

The length of the side folding mechanism is shortened in the folding process of the folding short trailer, and the linkage end drives the lifting rod to move downwards;

The length of the side folding mechanism is prolonged in the unfolding process of the folding short trailer, and the linkage end drives the lifting rod to move upwards;

the height of the side folding mechanism after folding is lower than that of the telescopic upright post.

Optionally, the telescopic upright post further comprises a fixed upright post;

The lifting rod vertically slides relative to the fixed vertical rod;

The two ends of the side folding mechanism also comprise fixed ends, and the fixed ends are hinged with the corresponding fixed vertical rods of the telescopic upright posts;

the side folding mechanism is in the folding or unfolding process, the fixed end rotates, and the linkage end drives the lifting rod to move along the fixed vertical rod.

Optionally, a linkage sliding sleeve is slidably arranged on the fixed vertical rod;

the lifting rod is connected with the linkage sliding sleeve, and the linkage end is hinged with the linkage sliding sleeve;

The top of the fixed vertical rod is provided with a top foot fixing piece, and the fixed end is hinged with the top foot fixing piece;

The linkage end hinged with the linkage sliding sleeve drives the lifting rod to move downwards through the linkage sliding sleeve in the folding process of the folding short trailer;

And in the unfolding process of the folding short trailer, the linkage end hinged with the linkage sliding sleeve drives the lifting rod to move upwards through the linkage sliding sleeve.

Optionally, the lifting rod is located outside the fixed vertical rod, the lifting rod is slidably connected with the top foot fixing piece, and the top foot fixing piece forms a transverse limit for the lifting rod in the process of moving up and down the lifting rod;

Or the fixed vertical rod is of a hollow structure, the lifting rod is sleeved in the fixed vertical rod in a sliding manner, the linkage sliding sleeve is sleeved outside the fixed vertical rod in a sliding manner, a vertical bar-shaped hole is formed in the fixed vertical rod, the lifting rod is connected with the linkage sliding sleeve through a connecting piece, and the fixed vertical rod is transversely limited to the lifting rod in the vertical movement process of the lifting rod.

Optionally, the folding short trailer has four side folding mechanisms located at the front, rear, left and right, the side folding mechanisms located at the left and right being configured in a first or second configuration, the side folding mechanisms located at the front and rear being configured in a first configuration;

The first structure is as follows:

the first structure comprises a plurality of X-shaped rod groups which are sequentially hinged, wherein each X-shaped rod group comprises a first connecting rod and a second connecting rod which are hinged at the middle part;

In the side folding mechanism, a first end of a first connecting rod of the X-shaped rod group positioned at the head end forms the fixed end, and a first end of a second connecting rod forms the linkage end;

the first end of the first connecting rod of the X-shaped rod group positioned at the tail end forms the fixed end, and the first end of the second connecting rod forms the linkage end;

In one of the X-shaped rod groups, the first end of the first connecting rod and the first end of the second connecting rod are positioned on the same side;

the second structure is as follows:

the second structure comprises a first fork rod and a second fork rod which are positioned at one end, a third fork rod and a fourth fork rod which are positioned at the other end and a T-shaped folding assembly positioned in the middle;

the first fork rod and the second fork rod form a hinge at the middle part, and the third fork rod and the fourth fork rod form a hinge at the middle part;

The first end of the first fork rod forms the fixed end, the first end of the second fork rod forms the linkage end, and the first end of the first fork rod and the first end of the second fork rod are on the same side;

The first end of the third fork rod forms the fixed end, the first end of the fourth fork rod forms the linkage end, and the first end of the third fork rod and the first end of the fourth fork rod are on the same side;

The T-shaped folding assembly comprises a fifth fork rod, a sixth fork rod and a seventh fork rod; wherein,

The first end of the fifth fork rod is hinged with the second end of the second fork rod, and the first end of the sixth fork rod is hinged with the second end of the fourth fork rod;

the second end of the fifth fork rod is hinged with the second end of the sixth fork rod,

The hinge joint of the fifth fork rod and the sixth fork rod is connected with the first end of the seventh fork rod, and the second ends of the first fork rod and the third fork rod are hinged with the second end of the seventh fork rod;

In the first and second configurations: in the folding process of the folding short trailer, the fixed end and the linkage end which are positioned at the same side are mutually far away; the fixed end and the linkage end which are positioned on the same side are close to each other in the unfolding process of the folding short trailer.

Optionally, adjacent fixed ends of two adjacent side folding mechanisms are connected to the same top pin fixing piece, and adjacent linkage ends of two adjacent side folding mechanisms are connected to the same linkage sliding sleeve.

Optionally, the folding short trailer further comprises a bottom support mechanism, the bottom support mechanism is hinged between the four telescopic upright posts, and a group of side folding mechanisms which are oppositely arranged are connected with the bottom support mechanism through a first connecting component and a second connecting component respectively; the bottom support mechanism can be folded, contracted and gathered, and the folded height is lower than the height of the telescopic upright post;

The folding short trailer further comprises a handle mechanism, the handle mechanism comprises a telescopic rod, a first cross rod and a second cross rod, the first ends of the first cross rod and the second cross rod are hinged with the telescopic rod, the second ends of the first cross rod and the second cross rod are respectively in one-to-one correspondence with the lower ends of two adjacent telescopic upright posts and are in limited angle rotation connection, the telescopic rod can be telescopic, and the height of the telescopic rod in a retraction state is lower than that of the telescopic upright post;

The four telescopic upright posts are provided with rollers at the lower ends, and at least one pair of rollers is a universal wheel.

Optionally, the bottom support mechanism comprises a first bottom connecting piece and a second bottom connecting piece, the first connecting component is provided with a third bottom connecting piece, and the second connecting component is provided with a fourth bottom connecting piece;

The first bottom connecting piece is rotationally connected with the lower ends of two adjacent telescopic upright posts through a first bottom connecting rod at a limited angle;

The second bottom connecting piece is rotationally connected with the lower ends of the other two adjacent telescopic upright posts through a second bottom connecting rod at a limited angle;

the first bottom connecting piece is rotationally connected with the third bottom connecting piece and the fourth bottom connecting piece through a third bottom connecting rod at a limited angle;

the second bottom connecting piece is rotationally connected with the third bottom connecting piece and the fourth bottom connecting piece through a fourth bottom connecting rod at a limited angle;

and the height of the first bottom connecting piece and the second bottom connecting piece is lower than that of the telescopic upright post when the folding short trailer is in a folding state.

Optionally, the top ends of the four telescopic upright posts are respectively used for being connected with four corners of the cloth bag of the folding short trailer in a one-to-one correspondence manner.

(III) beneficial effects

Folding short trailer is folding in-process, and the flexible stand shrink of side folding mechanism drive and being connected with it shortens, and folding in-process flexible stand automatic contraction is short, and folding short trailer is folding in-process of expanding, and the flexible stand of side folding mechanism drive and being connected with it stretches out, and the in-process flexible stand of expanding stretches out automatically, and the simple operation facilitates the user to use.

The expansion volume and the folding volume of the trailer are changed by arranging the telescopic upright post, and the telescopic upright post is stretched during expansion, so that the height of the trailer after expansion is increased, and the volume inside the trailer is increased; the telescopic upright post is contracted and shortened when the trailer is folded, the overall height of the folding and shortening trailer is reduced, and the occupied space of the trailer is further reduced, so that the trailer is convenient to carry and transport.

Drawings

FIG. 1 is a perspective view of a first construction of a folding shorter trailer of the present invention;

FIG. 2 is a perspective view of a second embodiment of the folding shorter trailer of the present invention;

FIG. 3 is a schematic illustration of the connection of a side folding mechanism in a first embodiment of a folding shorter trailer of the present invention;

FIG. 4 is a schematic view of the structure of a telescoping mast of a first embodiment of the folding shorter trailer of the present invention;

FIG. 5 is a schematic view of a telescopic column of a second embodiment of a collapsible trailer of the present invention;

FIG. 6 is a side view of a first embodiment of a folding shorter trailer of the present invention;

FIG. 7 is a side view of a second embodiment of a folding shorter trailer of the present invention;

FIG. 8 is a front view of a first embodiment of a folding shorter trailer of the present invention;

FIG. 9 is a front view of a second embodiment of a folding shorter trailer of the present invention;

FIG. 10 is a side view of a second configuration of the folding shorter trailer of the present invention;

FIG. 11 is a top view of the folding shorter trailer of the present invention;

FIG. 12 is a schematic view of a folding dwarf trailer of the present invention in a semi-folded condition;

fig. 13 is a schematic view showing a folded state of the folding dwarf trailer of the present invention.

[ Reference numerals description ]

1: A telescopic column; 11: a first telescopic column; 12: the second telescopic upright post; 13: the third telescopic upright post; 14: a fourth telescopic column; 15: a linkage sliding sleeve; 16: a top foot fixing piece; 17: a bar-shaped hole;

111: a first lifting rod; 112: a first fixed vertical rod;

121: a second lifting rod; 122: a second fixed vertical rod;

131: a third lifting rod; 132: a third fixed vertical rod;

141: a fourth lifting rod; 142: a fourth fixed vertical rod;

2: a side folding mechanism; 21: a first folding mechanism; 22: a second folding mechanism; 23: a third folding mechanism; 24: a fourth folding mechanism;

201: a link end; 202: a fixed end;

211: a first X-shaped rod group; 212: a second X-shaped rod group; 213: a third X-shaped rod group; 214: a fourth X-shaped bar set; 215: a fifth X-shaped bar set;

2111: a first link; 2112: a second link;

2121: a third link; 2122: a fourth link;

231: a first fork lever; 232: a second fork lever; 233: a third yoke; 234: a fourth yoke; 235: a fifth fork lever; 236: a sixth yoke; 237: a seventh yoke;

25: a first connection assembly; 26: a second connection assembly; 251: a first boom; 261: a second boom;

3: a bottom support mechanism; 31: a first bottom link; 32: a second bottom link; 33: a third bottom link; 34: a fourth bottom link; 35: a first bottom link; 36: a second bottom link; 37: a third bottom link; 38: a fourth bottom link;

4: a handle mechanism; 41: a telescopic rod; 42: a first cross bar; 43: a second cross bar;

5: and a roller.

Detailed Description

The invention will be better explained for understanding by referring to the following detailed description of the embodiments in conjunction with the accompanying drawings.

While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

As shown in fig. 1 and 2, the present invention provides a collapsible trailer having a collapsed condition with a height less than a height of an expanded condition.

As shown in fig. 1 to 3, the folding short trailer comprises four telescopic columns 1 arranged at rectangular intervals and at least two opposite side folding mechanisms 2, namely, the side folding mechanisms 2 of the folding short trailer comprise three forms: in the first form, a side folding mechanism 2 is provided on each of the left and right sides; in the second form, a side folding mechanism 2 is provided on each of the front side and the rear side; in a third form, a side folding mechanism 2 is provided on each of the front, rear, left and right sides. For convenience of description, the left side folding mechanism 2 is defined as a first folding mechanism 21, the right side folding mechanism 2 is defined as a second folding mechanism 22, the front side folding mechanism 2 is defined as a third folding mechanism 23, and the rear side folding mechanism 2 is defined as a fourth folding mechanism 24; the first folding mechanism 21 and the second folding mechanism 22 are two opposite side folding mechanisms 2, and the third folding mechanism 23 and the fourth folding mechanism 24 are two opposite side folding mechanisms 2. The four telescopic upright posts 1 which are arranged at intervals in a rectangle are respectively a first telescopic upright post 11, a second telescopic upright post 12, a third telescopic upright post 13 and a fourth telescopic upright post 14. When the side folding mechanism 2 is of a first form, the first folding mechanism 21 is hinged between the first telescopic upright 11 and the second telescopic upright 12, and the second folding mechanism 22 is hinged between the third telescopic upright 13 and the fourth telescopic upright 14; when the side folding mechanism 2 is in the second form, the third folding mechanism 23 is hinged between the first telescopic upright 11 and the fourth telescopic upright 14, and the fourth folding mechanism 24 is hinged between the second telescopic upright 12 and the third telescopic upright 13; when the side folding mechanism 2 is of the third form, the connection modes of the four side folding mechanisms 2 include those of the first form and the second form.

As shown in fig. 12 and 13, in the folding process of the folding dwarf trailer, the side folding mechanism 2 drives the telescopic upright 1 connected with the folding dwarf trailer to shrink and shorten, namely, the first folding mechanism 21 and the third folding mechanism 23 drive the first telescopic upright 11 to shrink and shorten and the top end is shortened, the first folding mechanism 21 and the fourth folding mechanism 24 drive the second telescopic upright 12 to shrink and shorten and the top end is shortened, the second folding mechanism 22 and the third folding mechanism 23 drive the fourth telescopic upright 14 to shrink and shorten and the top end is shortened, the second folding mechanism 22 and the fourth folding mechanism 24 drive the third telescopic upright 13 to shrink and shorten and the top end is shortened, the automatic shrinkage and the dwarf of the telescopic upright 1 in the folding process are convenient to operate, and the folding dwarf trailer is convenient for users to use. In contrast, in the unfolding process of the folding and dwarfing trailer, the side folding mechanism 2 drives the telescopic upright 1 connected with the folding and dwarfing trailer to extend and the top end of the folding and dwarfing trailer is heightened, namely, the first folding mechanism 21 and the third folding mechanism 23 drive the first telescopic upright 11 to extend and the top end of the folding and dwarfing trailer to be heightened, the first folding mechanism 21 and the fourth folding mechanism 24 drive the second telescopic upright 12 to extend and the top end of the folding and dwarfing trailer to be heightened, the second folding mechanism 22 and the third folding mechanism 23 drive the fourth telescopic upright 14 to extend and the top end of the folding and dwarfing trailer to be heightened, the second folding mechanism 22 and the fourth folding mechanism 24 drive the third telescopic upright 13 to extend and the top end of the folding and dwarfing trailer to be heightened, and in the unfolding process, the folding and unfolding process of the folding and unfolding of the folding and dwarfing trailer to be convenient for users to use. The expansion volume and the folding volume of the trailer are changed by arranging the telescopic upright post 1, the telescopic upright post 1 is elongated and the top end of the telescopic upright post becomes high during expansion, the height of the trailer after expansion is increased, and then the volume inside the trailer is increased; the telescopic upright post 1 is shortened in shrinkage and the top end is shortened in folding, so that the overall height of the folding and shortening trailer is reduced, the occupied space of the trailer is further reduced, and the carrying and the transportation are convenient.

Further, as shown in fig. 3 to 5, the first telescopic column 11 includes a first lifting rod 111, the second telescopic column 12 includes a second lifting rod 121, the third telescopic column 13 includes a third lifting rod 131, and the fourth telescopic column 14 includes a fourth lifting rod 141, and the top of each lifting rod is the top of each telescopic column 1. Referring to fig. 4, both ends of the first folding mechanism 21 are provided with a link end 201 hinged to the first lifting rod 111 and the second lifting rod 121, both ends of the second folding mechanism 22 are provided with a link end 201 hinged to the third lifting rod 131 and the fourth lifting rod 141, both ends of the third folding mechanism 23 are provided with a link end 201 hinged to the first lifting rod 111 and the fourth lifting rod 141, and both ends of the fourth folding mechanism 24 are provided with a link end 201 hinged to the second lifting rod 121 and the third lifting rod 131. In the folding process of the folding short trailer, the transverse length of each side folding mechanism 2 is shortened, the linkage ends 201 at the two ends of each side folding mechanism 2 drive the corresponding lifting rods to automatically move downwards, and each telescopic upright 1 automatically contracts and becomes short; in the unfolding process of the folding and dwarfing trailer, the transverse length of each side folding mechanism 2 is prolonged, the linkage ends 201 at the two ends of each side folding mechanism 2 drive the corresponding lifting rods to automatically move upwards, and each telescopic upright 1 automatically stretches and the top end of each telescopic upright is heightened. The height of each side folding mechanism 2 after folding is lower than the height of the telescopic column 1 after shrinking and shortening and the top end is shorter.

Still further, as shown in fig. 3 to 5, the first telescopic column 11 further includes a first fixed vertical rod 112, the second telescopic column 12 further includes a second fixed vertical rod 122, the third telescopic column 13 further includes a third fixed vertical rod 132, the fourth telescopic column 14 further includes a fourth fixed vertical rod 142, the first lifting rod 111 vertically slides with respect to the first fixed vertical rod 112, the second lifting rod 121 vertically slides with respect to the second fixed vertical rod 122, the third lifting rod 131 vertically slides with respect to the third fixed vertical rod 132, and the fourth lifting rod 141 vertically slides with respect to the fourth fixed vertical rod 142. The two ends of the first folding mechanism 21 are provided with fixed ends 202 hinged with the first fixed vertical rod 112 and the second fixed vertical rod 122, the two ends of the second folding mechanism 22 are provided with fixed ends 202 hinged with the third fixed vertical rod 132 and the fourth fixed vertical rod 142, the two ends of the third folding mechanism 23 are provided with fixed ends 202 hinged with the first fixed vertical rod 112 and the fourth fixed vertical rod 142, and the two ends of the fourth folding mechanism 24 are provided with fixed ends 202 hinged with the second fixed vertical rod 122 and the third fixed vertical rod 132. In the folding or unfolding process of each side folding mechanism 2, each fixed end 202 rotates around a hinge shaft hinged with the corresponding fixed vertical rod, the fixed end 202 does not move up and down, and each linkage end 201 drives each lifting rod hinged with the fixed end 202 to move in the length direction of the fixed vertical rod, namely in the vertical direction.

Specifically, as shown in fig. 3 to 5, the first fixed vertical rod 112, the second fixed vertical rod 122, the third fixed vertical rod 132, and the fourth fixed vertical rod 142 are respectively provided with a linkage sliding sleeve 15 in a sliding manner, and the first lifting rod 111, the second lifting rod 121, the third lifting rod 131, and the fourth lifting rod 141 are respectively connected with the linkage sliding sleeves 15 on the first fixed vertical rod 112, the second fixed vertical rod 122, the third fixed vertical rod 132, and the fourth fixed vertical rod 142 in a one-to-one correspondence manner. The linkage ends 201 at two ends of the first folding mechanism 21 are respectively hinged with the linkage sliding sleeves 15 on the first fixed vertical rod 112 and the second fixed vertical rod 122, the linkage ends 201 at two ends of the second folding mechanism 22 are respectively hinged with the linkage sliding sleeves 15 on the third fixed vertical rod 132 and the fourth fixed vertical rod 142, the linkage ends 201 at two ends of the third folding mechanism 23 are respectively hinged with the linkage sliding sleeves 15 on the first fixed vertical rod 112 and the fourth fixed vertical rod 142, and the linkage ends 201 at two ends of the fourth folding mechanism 24 are respectively hinged with the linkage sliding sleeves 15 on the second fixed vertical rod 122 and the third fixed vertical rod 132. The top of the first fixed vertical rod 112, the second fixed vertical rod 122, the third fixed vertical rod 132 and the fourth fixed vertical rod 142 are respectively provided with a top foot fixing piece 16, the fixed ends 202 at two ends of the first folding mechanism 21 are respectively hinged with the top foot fixing pieces 16 on the first fixed vertical rod 112 and the second fixed vertical rod 122, the fixed ends 202 at two ends of the second folding mechanism 22 are respectively hinged with the top foot fixing pieces 16 on the third fixed vertical rod 132 and the fourth fixed vertical rod 142, the fixed ends 202 at two ends of the third folding mechanism 23 are respectively hinged with the top foot fixing pieces 16 on the first fixed vertical rod 112 and the fourth fixed vertical rod 142, and the fixed ends 202 at two ends of the fourth folding mechanism 24 are respectively hinged with the top foot fixing pieces 16 on the second fixed vertical rod 122 and the third fixed vertical rod 132. In the folding process of the folding short trailer, the linkage end 201 hinged with the linkage sliding sleeve 15 drives the lifting rod to move downwards through the linkage sliding sleeve 15; in the unfolding process of the folding short trailer, the linkage end 201 hinged with the linkage sliding sleeve 15 drives the lifting rod to move upwards through the linkage sliding sleeve 15.

The structures of the first telescopic upright 11, the second telescopic upright 12, the third telescopic upright 13 and the fourth telescopic upright 14 comprise the following two embodiments:

Referring to fig. 5, for example, the first telescopic upright 11 is taken as an illustration, the first lifting rod 111 is located outside the first fixed upright 112, the top leg fixing member 16 on the first fixed upright 112 is provided with a through hole with a central axis parallel to the central axis of the first fixed upright 112, the first lifting rod 111 is sleeved in the through hole so that the first lifting rod 111 is slidably connected with the top leg fixing member 16 on the first fixed upright 112, and in the process of moving the first lifting rod 111 up and down, the top leg fixing member 16 on the first fixed upright 112 forms a transverse limit for the first lifting rod 111, so that the first lifting rod 111 can only move in the central axis direction of the through hole. The second telescopic upright 12, the third telescopic upright 13 and the fourth telescopic upright 14 have the same structure as the first telescopic upright 11, and are not described in detail herein;

Referring to fig. 4, a first telescopic upright 11 is taken as an example for illustration, a first fixed upright 112 is of a hollow structure, a first lifting rod 111 is slidably sleeved in the first fixed upright 112, a linkage sliding sleeve 15 on the first fixed upright 112 is slidably sleeved outside the first fixed upright 112, a vertical bar-shaped hole 17 is formed in the first fixed upright 112, the first lifting rod 111 is connected with the linkage sliding sleeve 15 on the first fixed upright 112 through a connecting piece, and the connecting piece comprises a rivet, a bolt and the like, so long as the first lifting rod 111 can be detachably connected with the linkage sliding sleeve 15 on the first fixed upright 112 through the bar-shaped hole 17, and the invention is not limited herein. In the process of moving the first lifting rod 111 up and down, the first fixed vertical rod 112 forms a transverse limit for the first lifting rod 111, so that the first lifting rod 111 can only move in the central axis direction of the first fixed vertical rod 112. The second telescopic upright 12, the third telescopic upright 13 and the fourth telescopic upright 14 are all identical to the first telescopic upright 11 in structure, and are not described in detail herein.

The configuration of the side folding mechanism 2 on the left and right sides may be either a first configuration or a second configuration, and the configuration of the side folding mechanism 2 on the front and rear sides may be a first configuration, specifically as follows:

And (3) constructing:

as shown in fig. 4 to 9, the side folding mechanism 2 in the construction one includes a plurality of X-shaped rod groups hinged in sequence, the X-shaped rod groups including a first link 2111 and a second link 2112 forming a hinge in the middle, and the hinge point is not limited to the center point of the first link 2111 and the second link 2112, and the hinge point may be deviated from the center point according to actual requirements. The first end of the first link 2111 in the X-bar group at the head end constitutes the fixed end 202, and the first end of the second link 2112 in the X-bar group at the head end constitutes the link end 201, on the first folding mechanism 21, the second folding mechanism 22, the third folding mechanism 23, and the fourth folding mechanism 24. The first end of the first link 2111 in the trailing set of X-bars constitutes the fixed end 202 and the first end of the second link 2112 in the trailing set of X-bars constitutes the link end 201. Also, in one X-bar group, the first end of the first link 2111 is on the same side as the first end of the second link 2112. The adjacent fixed ends 202 of the adjacent two side folding mechanisms 2 are connected to the same leg fixing member 16, and the adjacent link ends 201 of the adjacent two side folding mechanisms 2 are connected to the same link slide sleeve 15.

In a preferred embodiment, the first folding mechanism 21 and the second folding mechanism 22 each include three sequentially hinged X-shaped rod groups, which are respectively a first X-shaped rod group 211, a second X-shaped rod group 212 and a third X-shaped rod group 213, wherein the first X-shaped rod group 211 is an X-shaped rod group located at the head end, the third X-shaped rod group 213 is an X-shaped rod group located at the tail end, and the second X-shaped rod group 212 is located between the first X-shaped rod group 211 and the third X-shaped rod group 213. The second X-bar set 212 includes a third link 2121 and a fourth link 2122 having bars hinged to each other. The first ends of the first links 2111 of the first and third X-bar sets 211, 213 each constitute a fixed end 202, and the first ends of the second links 2112 of the first and third X-bar sets 211, 213 each constitute a link end 201. The first folding mechanism 21 and the second folding mechanism 22 have the same structure and symmetrical positions, and the illustration of the first folding mechanism 21 is taken as an example for specific explanation, referring to fig. 6 and 7, in the first folding mechanism 21, a first end of a first link 2111 of the first X-shaped rod group 211 is hinged with the top leg fixing member 16 on the first fixing vertical rod 112, and a first end of a second link 2112 of the first X-shaped rod group 211 is hinged with the linkage sliding sleeve 15 on the first fixing vertical rod 112; the first end of the first connecting rod 2111 of the third X-shaped rod group 213 is hinged with the top foot fixing piece 16 on the second fixing vertical rod 122, and the first end of the second connecting rod 2112 of the third X-shaped rod group 213 is hinged with the linkage sliding sleeve 15 on the second fixing vertical rod 122; the second end of the first link 2111 of the first X-bar set 211 is hinged to the first end of the fourth link 2122, the second end of the second link 2112 of the first X-bar set 211 is hinged to the first end of the third link 2121, the second end of the first link 2111 of the third X-bar set 213 is hinged to the second end of the third link 2121, and the second end of the second link 2112 of the third X-bar set 213 is hinged to the second end of the fourth link 2122. In the second folding mechanism, the first end of a first connecting rod of the first X-shaped rod group is hinged with a top foot fixing piece on a fourth fixed vertical rod, and the first end of a second connecting rod of the first X-shaped rod group is hinged with a linkage sliding sleeve on the fourth fixed vertical rod; the first end of the first connecting rod of the third X-shaped rod group is hinged with a top foot fixing piece on the third fixed vertical rod, and the first end of the second connecting rod of the third X-shaped rod group is hinged with a linkage sliding sleeve on the third fixed vertical rod; the second end of the first connecting rod of the first X-shaped rod group is hinged with the first end of the fourth connecting rod, the second end of the second connecting rod of the first X-shaped rod group is hinged with the first end of the third connecting rod, the second end of the first connecting rod of the third X-shaped rod group is hinged with the second end of the third connecting rod, and the second end of the second connecting rod of the third X-shaped rod group is hinged with the second end of the fourth connecting rod.

In the preferred embodiment, the third folding mechanism 23 and the fourth folding mechanism 24 each include two X-shaped rod groups, namely, a fourth X-shaped rod group 214 and a fifth X-shaped rod group 215, the fourth X-shaped rod group 214 is an X-shaped rod group located at the head end, the fifth X-shaped rod group 215 is an X-shaped rod group located at the tail end, the first ends of the first links 2111 of the fourth X-shaped rod group 214 and the fifth X-shaped rod group 215 each form the fixed end 202, and the first ends of the second links 2112 of the fourth X-shaped rod group 214 and the fifth X-shaped rod group 215 each form the link end 201. The third folding mechanism 23 and the fourth folding mechanism 24 have the same structure and symmetrical positions, and the illustration of the third folding mechanism 23 is taken as an example for specific explanation, referring to fig. 8 and 9, in the third folding mechanism 23, the first end of the first link 2111 of the fourth X-shaped rod group 214 is hinged with the top leg fixing member 16 on the fourth fixed vertical rod 142, and the first end of the second link 2112 of the fourth X-shaped rod group 214 is hinged with the linkage sliding sleeve 15 on the fourth fixed vertical rod 142; the first end of the first connecting rod 2111 of the fifth X-shaped rod group 215 is hinged with the top foot fixing piece 16 on the first fixed vertical rod 112, and the first end of the second connecting rod 2112 of the fifth X-shaped rod group 215 is hinged with the linkage sliding sleeve 15 on the first fixed vertical rod 112; the second end of the first link 2111 of the fourth X-bar set 214 is hinged to the second end of the first link 2111 of the fifth X-bar set 215, and the second end of the second link 2112 of the fourth X-bar set 214 is hinged to the second end of the second link 2112 of the fifth X-bar set 215. In the fourth folding mechanism, the first end of a first connecting rod of the fourth X-shaped rod group is hinged with a top foot fixing piece on the third fixed vertical rod, and the first end of a second connecting rod of the fourth X-shaped rod group is hinged with a linkage sliding sleeve on the third fixed vertical rod; the first end of the first connecting rod of the fifth X-shaped rod group is hinged with the top foot fixing piece on the second fixed vertical rod, and the first end of the second connecting rod of the fifth X-shaped rod group is hinged with the linkage sliding sleeve on the second fixed vertical rod; the second end of the first connecting rod of the fourth X-shaped rod group is hinged with the second end of the first connecting rod of the fifth X-shaped rod group, and the second end of the second connecting rod of the fourth X-shaped rod group is hinged with the second end of the second connecting rod of the fifth X-shaped rod group.

And (2) a second structure:

As shown in fig. 10, the side folding mechanism 2 in the second configuration employs the first folding mechanism 21 and the second folding mechanism 22, including the first fork 231 and the second fork 232 at one end, the third fork 233 and the fourth fork 234 at the other end, and the T-shaped folding assembly in the middle; the first yoke 231 and the second yoke 232 form a hinge in the middle, the third yoke 233 and the fourth yoke 234 form a hinge in the middle, and the hinge point is not limited to the center point of the two yokes, but the hinge point may be deviated from the center point according to actual requirements. The first end of the first fork 231 forms the fixed end 202, the first end of the second fork 232 forms the link end 201, and the first end of the first fork 231 and the first end of the second fork 232 are on the same side. The first end of the third yoke 233 forms the fixed end 202 and the first end of the fourth yoke 234 forms the link end 201, the first end of the third yoke 233 being on the same side as the first end of the fourth yoke 234. The T-fold assembly includes a fifth yoke 235, a sixth yoke 236, and a seventh yoke 237; wherein, the first end of the fifth fork 235 is hinged to the second end of the second fork 232, the first end of the sixth fork 236 is hinged to the second end of the fourth fork 234, the second end of the fifth fork 235 is hinged to the second end of the sixth fork 236, the hinge point of the fifth fork 235 and the sixth fork 236 is connected to the first end of the seventh fork 237, and the second ends of the first fork 231 and the third fork 233 are both hinged to the second end of the seventh fork 237. Similarly, the first folding mechanism 21 and the second folding mechanism 22 have the same structure and symmetrical positions, and the illustration of the first folding mechanism 21 is specifically described with reference to fig. 10, in the first folding mechanism 21, the first end of the first fork arm 231 is hinged to the top leg fixing member 16 on the first fixed vertical rod 112, the first end of the second fork arm 232 is hinged to the linkage sliding sleeve 15 on the first fixed vertical rod 112, the first end of the third fork arm 233 is hinged to the top leg fixing member 16 on the second fixed vertical rod 122, and the first end of the fourth fork arm 234 is hinged to the linkage sliding sleeve 15 on the second fixed vertical rod 122. In the second folding mechanism 22, the first end of the first fork arm 231 is hinged to the top leg fixing member 16 on the fourth fixed vertical rod 142, the first end of the second fork arm 232 is hinged to the linkage sliding sleeve 15 on the fourth fixed vertical rod 142, the first end of the third fork arm 233 is hinged to the top leg fixing member 16 on the third fixed vertical rod 132, and the first end of the fourth fork arm 234 is hinged to the linkage sliding sleeve 15 on the third fixed vertical rod 132. In the first and second structures, the fixed end 202 and the linkage end 201 on the same side are far away from each other in the folding process, the linkage end 201 drives the lifting rod to descend, and the fixed end 202 and the linkage end 201 on the same side are close to each other in the unfolding process, and the linkage end 201 drives the lifting rod to ascend.

As shown in fig. 11, the folding short trailer further comprises a bottom support mechanism 3, wherein the bottom support mechanism 3 is hinged between the four telescopic upright posts 1, and the first folding mechanism 21 and the second folding mechanism 22 are respectively connected with the bottom support mechanism 3 through a first connecting assembly 25 and a second connecting assembly 26. The bottom support mechanism 3 can be folded, contracted and gathered, and the folded height is lower than the height of the telescopic upright column 1. Further, the bottom bracket mechanism 3 includes a first bottom connector 31 and a second bottom connector 32, a third bottom connector 33 is provided on the first connecting assembly 25, and a fourth bottom connector 34 is provided on the second connecting assembly 26. The first bottom link 31 connects the lower ends of the first telescopic column 11 and the fourth telescopic column 14 by rotation of a first bottom link 35 at a limited angle, and the second bottom link 32 connects the lower ends of the second telescopic column 12 and the third telescopic column 13 by rotation of a second bottom link 36 at a limited angle. The first bottom link 31 connects the third bottom link 33 and the fourth bottom link 34 by a limited angle rotation through a third bottom link 37, and the second bottom link 32 connects the third bottom link 33 and the fourth bottom link 34 by a limited angle rotation through a fourth bottom link 38. In the folded condition, the first and second bottom links 31, 32 are each lower than the telescopic column 1.

In particular, the first and second connection assemblies 25, 26 may be booms or flexures. When the number of the X-shaped bar groups of the first folding mechanism 21 and the second folding mechanism 22 is an odd number, the first connection assembly 25 and the second connection assembly 26 are both hanger bars; when the number of the X-shaped bar sets of the first folding mechanism 21 and the second folding mechanism 22 is an even number, the first connecting component 25 and the second connecting component 26 are flexible members, such as steel wires, one ends of the first connecting component 25 and the second connecting component 26 are respectively connected with the first folding mechanism 21 and the second folding mechanism 22, and the other ends are respectively connected with the third bottom connecting member 33 and the fourth bottom connecting member 34. taking a configuration as an example, and the first folding mechanism 21 and the second folding mechanism 22 include three X-shaped rod groups for explanation, referring to fig. 4 to 7, the first connecting component 25 is a first boom 251, the second connecting component 26 is a second boom 261, and the third bottom connecting piece 33 and the fourth bottom connecting piece 34 are boom joints, which are slidably connected with the first boom 251 and the second boom 261. The boom joint is provided with a mounting groove hinged with the third bottom connecting rod 37 and the fourth bottom connecting rod 38 correspondingly, and the notch of the mounting groove is upward at the moment, so that the third bottom connecting rod 37 and the fourth bottom connecting rod 38 can only rotate from an inclined state to a horizontal state when in a folded state. The ends of the first boom 251 and the second boom 261 are provided with limit joints for limiting the boom joints, and when the boom joints move to the limit joints along the first boom 251 or the second boom 261, the displacement of the boom joints is limited and cannot be separated from the corresponding booms. Referring to fig. 11, the first bottom connecting piece 31 and the second bottom connecting piece 32 are symmetrically provided with four mounting grooves, two first bottom connecting rods 35 and two third bottom connecting rods 37 are respectively in one-to-one rotary connection with the inner walls of the four mounting grooves on the first bottom connecting piece 31, and two second bottom connecting rods 36 and two fourth bottom connecting rods 38 are respectively in one-to-one rotary connection with the inner walls of the four mounting grooves on the second bottom connecting piece 32. In the unfolded state of the trailer, the bottom of the mounting groove is horizontally arranged and the opening is downward, two first bottom connecting rods 35 and two third bottom connecting rods 37 are respectively positioned in the corresponding mounting grooves on the first bottom connecting piece 31, and two second bottom connecting rods 36 and two fourth bottom connecting rods 38 are respectively positioned in the corresponding mounting grooves on the second bottom connecting piece 32. When each bottom link is rotated from the inclined state when in the folded state to the state that the pipe wall is abutted against the bottom of the installation groove compared with the first bottom link 31 and the second bottom link 32, each link cannot continue to rotate due to the restriction of the installation groove, so that the horizontal state is maintained, and effective supporting force is provided for the bottom of the trailer. The lower ends of the first telescopic upright 11, the second telescopic upright 12, the third telescopic upright 13 and the fourth telescopic upright 14 are horizontally provided with mounting grooves with upward openings, the two first bottom connecting rods 35 are respectively hinged with the mounting grooves at the lower ends of the first telescopic upright 11 and the fourth telescopic upright 14, the two second bottom connecting rods 36 are respectively hinged with the mounting grooves at the lower ends of the second telescopic upright 12 and the third telescopic upright 13, and the mounting grooves limit the first bottom connecting rods 35 and the second bottom connecting rods 36 to rotate to a horizontal state only from an inclined state in a folded state. When the first folding mechanism 21 and the second folding mechanism 22 are of the second structure, in the first folding mechanism 21, the second ends of the first fork arm 231 and the third fork arm 233 are hinged with the second end of the seventh fork arm 237, and the second end of the seventh fork arm 237 is slidably connected with the third bottom connecting piece 33; in the second folding mechanism 22, the second ends of the first fork arm 231 and the third fork arm 233 are hinged to the second end of the seventh fork arm 237, and the second end of the seventh fork arm 237 is slidably connected to the fourth bottom link 34.

As shown in fig. 1, 2, 8 and 9, the folding short trailer further includes a handle mechanism 4, the handle mechanism 4 includes a telescopic rod 41, a first cross rod 42 and a second cross rod 43, first ends of the first cross rod 42 and the second cross rod 43 are all hinged with the telescopic rod 41, second ends of the first cross rod 42 and the second cross rod 43 are respectively in one-to-one corresponding connection with lower ends of the first telescopic upright 11 and the second telescopic upright 12 in a limited angle rotation manner, the telescopic rod 41 can stretch and retract, and the height of the telescopic rod 41 in a retracted state is lower than that of the telescopic upright 1. The lower ends of the four telescopic upright posts 1 are provided with rollers 5, and at least one pair of rollers 5 are universal wheels, so that a user can control the advancing direction of the trailer conveniently.

Preferably, the top ends of the four telescopic upright posts 1 are respectively used for being connected with four corners of the cloth bag of the folding short trailer in a one-to-one correspondence manner. In the folding or unfolding process of the trailer, the lifting rod is driven to rise or become short by the folding mechanism, so that the space of the cloth bag arranged at the top of the telescopic upright column 1 is enlarged after the folding and shortening trailer is unfolded.

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.

In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art without departing from the scope of the invention.

Claims

1. The folding and shortening trailer is characterized by comprising four telescopic upright posts (1) which are arranged at intervals in a rectangular shape and at least two side folding mechanisms (2) which are arranged oppositely, wherein two ends of each side folding mechanism (2) are respectively hinged to two adjacent telescopic upright posts (1);

In the folding process of the folding short trailer, the side folding mechanism (2) drives the telescopic upright post (1) connected with the folding short trailer to shrink and shorten; the side folding mechanism (2) drives the telescopic upright post (1) connected with the folding short trailer to extend in the unfolding process; the height of the folding short trailer in the folded state is smaller than that in the unfolded state.

2. A folding dwarf trailer according to claim 1, characterized in that the telescopic upright (1) comprises a lifting rod;

The top of the lifting rod is the top of the telescopic upright post (1), and the two ends of the side folding mechanism (2) are provided with linkage ends (201) hinged with the lifting rod corresponding to the telescopic upright post (1);

in the folding process of the folding short trailer, the length of the side folding mechanism (2) is shortened, and the linkage end (201) drives the lifting rod to move downwards;

The length of the side folding mechanism (2) is prolonged in the unfolding process of the folding short trailer, and the linkage end (201) drives the lifting rod to move upwards;

the height of the side folding mechanism (2) after folding is lower than that of the telescopic upright post (1).

3. A folding dwarf trailer according to claim 2, characterized in that the telescopic upright (1) further comprises a fixed upright;

The lifting rod vertically slides relative to the fixed vertical rod;

The two ends of the side folding mechanism (2) also comprise fixed ends (202), and the fixed ends (202) are hinged with the corresponding fixed vertical rods of the telescopic upright posts (1);

the side folding mechanism (2) is folded or unfolded, the fixed end (202) rotates automatically, and the linkage end (201) drives the lifting rod to move along the fixed vertical rod.

4. A folding and dwarfing trailer as claimed in claim 3, characterized in that the fixed vertical rod is provided with a linkage sliding sleeve (15) in a sliding manner;

the lifting rod is connected with the linkage sliding sleeve (15), and the linkage end (201) is hinged with the linkage sliding sleeve (15);

A top foot fixing piece (16) is arranged at the top of the fixed vertical rod, and the fixed end (202) is hinged with the top foot fixing piece (16);

in the folding process of the folding short trailer, the linkage end (201) hinged with the linkage sliding sleeve (15) drives the lifting rod to move downwards through the linkage sliding sleeve (15);

in the unfolding process of the folding short trailer, the linkage end (201) hinged with the linkage sliding sleeve (15) drives the lifting rod to move upwards through the linkage sliding sleeve (15).

5. The folding short trailer according to claim 4, characterized in that the lifting rod is located outside the fixed vertical rod, the lifting rod is in sliding connection with the top foot fixing member (16), and the top foot fixing member (16) forms a transverse limit for the lifting rod during the up-and-down movement of the lifting rod;

or the fixed montant is hollow structure, the lifter sliding sleeve is located in the fixed montant, linkage sliding sleeve (15) sliding sleeve is located outside the fixed montant, vertical bar hole (17) have been seted up on the fixed montant, the lifter passes through the connecting piece and connects linkage sliding sleeve (15) the in-process of lifter reciprocates, fixed vertical pole is right the lifter constitutes transversely spacing.

6. A folding dwarf trailer as claimed in any one of claims 3 to 5, characterized in that the folding dwarf trailer has four side folding mechanisms (2) located in front, rear, left and right, the side folding mechanisms (2) located in left and right being configured in one or two configurations, the side folding mechanisms (2) located in front and rear being configured in one configuration;

The first structure is as follows:

The first structure comprises a plurality of X-shaped rod groups which are hinged in sequence, wherein each X-shaped rod group comprises a first connecting rod (2111) and a second connecting rod (2112) which are hinged at the middle part;

In the side folding mechanism (2), a first end of a first connecting rod (2111) of the X-shaped rod group positioned at the head end forms the fixed end (202), and a first end of a second connecting rod (2112) forms the linkage end (201);

The first end of a first connecting rod (2111) of the X-shaped rod group positioned at the tail end forms the fixed end (202), and the first end of a second connecting rod (2112) forms the linkage end (201);

In one of the X-shaped rod groups, the first end of the first connecting rod (2111) and the first end of the second connecting rod (2112) are positioned on the same side;

the second structure is as follows:

The second structure comprises a first fork rod (231) and a second fork rod (232) at one end, a third fork rod (233) and a fourth fork rod (234) at the other end and a T-shaped folding assembly in the middle;

The first fork lever (231) and the second fork lever (232) form a hinge in the middle, and the third fork lever (233) and the fourth fork lever (234) form a hinge in the middle;

The first end of the first fork rod (231) forms the fixed end (202), the first end of the second fork rod (232) forms the linkage end (201), and the first end of the first fork rod (231) and the first end of the second fork rod (232) are on the same side;

the first end of the third fork rod (233) forms the fixed end (202), the first end of the fourth fork rod (234) forms the linkage end (201), and the first end of the third fork rod (233) and the first end of the fourth fork rod (234) are on the same side;

the T-fold assembly includes a fifth prong (235), a sixth prong (236), and a seventh prong (237); wherein,

A first end of the fifth fork (235) is hinged to a second end of the second fork (232), and a first end of the sixth fork (236) is hinged to a second end of the fourth fork (234);

A second end of the fifth yoke (235) is hinged to a second end of the sixth yoke (236),

The hinge joint of the fifth fork rod (235) and the sixth fork rod (236) is connected with the first end of the seventh fork rod (237), and the second ends of the first fork rod (231) and the third fork rod (233) are hinged with the second end of the seventh fork rod (237);

In the first and second configurations: in the folding process of the folding short trailer, a fixed end (202) and a linkage end (201) which are positioned on the same side are far away from each other; in the unfolding process of the folding short trailer, the fixed end (202) and the linkage end (201) which are positioned on the same side are close to each other.

7. The folding short trailer according to claim 6, characterized in that adjacent fixed ends (202) of adjacent two side folding mechanisms (2) are connected to the same foothold (16), and adjacent linked ends (201) of adjacent two side folding mechanisms (2) are connected to the same linked sliding sleeve (15).

8. A folding and dwarfing trailer as claimed in claim 1, characterized in that it further comprises a bottom support mechanism (3), said bottom support mechanism (3) being hinged between four said telescopic uprights (1), a set of said side folding mechanisms (2) being arranged opposite each other, being connected to said bottom support mechanism (3) by means of a first connecting assembly (25) and a second connecting assembly (26), respectively; the bottom support mechanism (3) can be folded, contracted and gathered, and the folded height is lower than the height of the telescopic upright post (1);

The folding short trailer further comprises a handle mechanism (4), the handle mechanism (4) comprises a telescopic rod (41), a first cross rod (42) and a second cross rod (43), the first ends of the first cross rod (42) and the second cross rod (43) are hinged with the telescopic rod (41), the second ends of the first cross rod (42) and the second cross rod (43) are respectively in one-to-one correspondence with the lower ends of two adjacent telescopic upright posts (1) and are in limited-angle rotation connection, the telescopic rod (41) can stretch and retract, and the height of the telescopic rod (41) in a retracted state is lower than that of the telescopic upright posts (1);

the lower ends of the four telescopic upright posts (1) are provided with rollers (5), and at least one pair of rollers (5) is a universal wheel.

9. A folding dwarf trailer according to claim 8, characterized in that the bottom stay mechanism (3) comprises a first bottom connection (31) and a second bottom connection (32), the first connection assembly (25) being provided with a third bottom connection (33) and the second connection assembly (26) being provided with a fourth bottom connection (34);

The first bottom connecting piece (31) is rotationally connected with the lower ends of two adjacent telescopic upright posts (1) through a first bottom connecting rod (35) at a limited angle;

The second bottom connecting piece (32) is rotationally connected with the lower ends of the other two adjacent telescopic upright posts (1) through a second bottom connecting rod (36) at a limited angle;

The first bottom connecting piece (31) is rotationally connected with the third bottom connecting piece (33) and the fourth bottom connecting piece (34) through a third bottom connecting rod (37) at a limited angle;

the second bottom connecting piece (32) is rotationally connected with the third bottom connecting piece (33) and the fourth bottom connecting piece (34) through a fourth bottom connecting rod (38) at a limited angle;

In the folded state, the heights of the first bottom connecting piece (31) and the second bottom connecting piece (32) are lower than the height of the telescopic upright post (1).

10. A folding and dwarfing trailer as claimed in any one of claims 1 to 5, characterized in that the top ends of the four telescopic uprights (1) are respectively connected in a one-to-one correspondence with the four corners of the cloth pocket of the folding and dwarfing trailer.