Folding trailer and folding shortened trailer

Abstract

The folding trailer comprises four stand columns, a bottom folding mechanism, a first folding mechanism, a third folding mechanism, a second folding mechanism, a fourth folding mechanism and first sliding sleeves arranged on the stand columns in a sliding mode, and short pipes are hinged to the first sliding sleeves. Each of the first folding mechanism and the second folding mechanism comprises a first cross assembly, at least one third cross assembly and a second cross assembly which are hinged in sequence; the first cross assembly and the second cross assembly each comprise a first fork pipe and a second fork pipe, the first fork pipes are hinged to the upper ends of the corresponding stand columns, and the short pipes are hinged to the first fork pipes. Second sliding sleeves are arranged on the short pipes, and the second fork pipes are hinged to the second sliding sleeves on the corresponding short pipes. The folding heights of the first cross assembly, the third cross assembly, the second cross assembly, the third folding mechanism, the fourth folding mechanism and the bottom folding mechanism are all not higher than the height of the upper end of the stand column, it is guaranteed that the height is not increased when the trailer is folded and gathered, and a user can conveniently store and carry the trailer.

Description

Technical Field

[0001] The utility model relates to the technical field of trailers, in particular to a foldable trailer and a foldable and lowered trailer. Background Art

[0002] In daily life and production, it is often necessary to carry luggage or items, and trailer tools are often used in the process of carrying. Trailer tools are widely used in carrying things because they are easy to push and save time and effort. In order to facilitate the storage of trailer tools, the trailer tools are designed to be foldable, very light, and can be placed on the car after folding, which is easy to carry.

[0003] However, the existing foldable trailer has a small volume when unfolded and can store fewer items; while it has a large volume when folded and occupies a large space, which is particularly inconvenient when folded and stored in a place with limited space such as a car trunk, which seriously affects the user experience. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a foldable trailer and a foldable and short trailer, which solve the technical problem that the foldable trailer has a small volume in the unfolded state and a large volume in the folded state.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned object, the folding trailer of the utility model comprises four columns arranged at intervals in a rectangular shape, a bottom folding mechanism hinged between the four columns, a first folding mechanism, a third folding mechanism, a second folding mechanism and a fourth folding mechanism sequentially connected between two adjacent columns, and a first sliding sleeve slidably arranged on the columns, wherein a short tube is hinged on the first sliding sleeve;

[0008] The first folding mechanism and the second folding mechanism both comprise a first cross assembly, at least a third cross assembly, and a second cross assembly which are hinged in sequence; the first cross assembly and the second cross assembly both comprise a first fork tube and a second fork tube, the first fork tube is hinged to the upper end of the corresponding column, the short tube is hinged to the first fork tube; a second sliding sleeve is provided on the short tube, and the second fork tube is hinged to the second sliding sleeve on the corresponding short tube;

[0009] The folding heights of the first cross component, the third cross component, the second cross component, the third folding mechanism, the fourth folding mechanism and the bottom folding mechanism are not higher than the height of the upper end of the column.

[0010] Optionally, the first folding mechanism and the second folding mechanism are a first cross component, a third cross component, and a second cross component that are hinged in sequence.

[0011] Optionally, the folding trailer further comprises a first suspension rod and a second suspension rod,

[0012] The upper end of the first suspension rod is hinged to the first folding mechanism, the upper end of the second suspension rod is hinged to the second folding mechanism, and the lower ends of the first suspension rod and the second suspension rod are both connected to the bottom folding mechanism;

[0013] The first suspension rod and the second suspension rod are both flexible rods. During the folding process of the foldable trailer, the first suspension rod and the second suspension rod are deformed, and both ends of the first suspension rod and the second suspension rod are close to each other.

[0014] Optionally, the bottom folding mechanism comprises a first bottom support assembly and a second bottom support assembly which are symmetrically arranged and hinged to each other, and the first bottom support assembly and the second bottom support assembly each comprise a first bottom connecting member, a first bottom connecting tube, a second bottom connecting tube, a third bottom connecting tube and a fourth bottom connecting tube;

[0015] The first ends of the first bottom connecting tube, the second bottom connecting tube, the third bottom connecting tube and the fourth bottom connecting tube are all connected to the first bottom connecting member with a limited angle of rotation;

[0016] The second ends of the first bottom connecting tube and the second bottom connecting tube are respectively connected to the lower ends of the corresponding columns in a rotatable manner at a limited angle.

[0017] Optionally, the bottom folding mechanism further includes a second bottom connecting member and a third bottom connecting member that are symmetrically arranged, and the lower ends of the first suspension rod and the second suspension rod are respectively connected to the second bottom connecting member and the third bottom connecting member in a one-to-one correspondence;

[0018] The third bottom connecting pipes of the first bottom support assembly and the second bottom support assembly are both rotatably connected to the third bottom connecting member at a limited angle;

[0019] The fourth bottom connecting pipes of the first bottom support assembly and the second bottom support assembly are both rotatably connected to the second bottom connecting member at a limited angle.

[0020] Optionally, the four pillars are respectively a first pillar, a second pillar, a third pillar and a fourth pillar;

[0021] The third folding mechanism and the fourth folding mechanism each include a first cross tube and a second cross tube hinged to each other and a third cross tube and a fourth cross tube hinged to each other, the first ends of the first cross tube and the third cross tube are hinged to each other, and the first ends of the second cross tube and the fourth cross tube are hinged to each other;

[0022] In the fourth folding mechanism, the second end of the first cross tube is hinged to the upper end of the fourth column, the second end of the third cross tube is hinged to the upper end of the first column, the second end of the second cross tube is hinged to the first sliding sleeve on the fourth column, and the second end of the fourth cross tube is hinged to the first sliding sleeve on the first column;

[0023] In the third folding mechanism, the second end of the first cross tube is hinged to the upper end of the second column, the second end of the third cross tube is hinged to the upper end of the third column, the second end of the second cross tube is hinged to the first sliding sleeve on the second column, and the second end of the fourth cross tube is hinged to the first sliding sleeve on the third column.

[0024] Optionally, the folding trailer further comprises a handle mechanism;

[0025] The handle mechanism comprises a telescopic rod, a first transverse tube, a second transverse tube and a stopper, and the telescopic rod is slidably connected to the stopper;

[0026] The first ends of the first transverse tube and the second transverse tube are respectively rotatably connected to the two ends of the limiter at a limited angle, and the second ends of the first transverse tube and the second transverse tube are respectively rotatably connected to the lower ends of the two columns connected to the fourth folding mechanism in a one-to-one correspondence.

[0027] Furthermore, the utility model also provides a foldable and short trailer, which comprises a lifting tube and the foldable trailer as described above, wherein one end of the lifting tube is hinged to the second sliding sleeve; the lifting tube is slidably connected to the upper end of the corresponding column, and the upper ends of four lifting tubes can be respectively connected to the four corners of the cloth bag of the foldable and short trailer in a one-to-one correspondence;

[0028] When the foldable trailer is transformed from a folded state to an unfolded state, the upper end of the lifting tube is vertically away from the upper end of the column during the unfolding process of the frame; when the foldable trailer is transformed from an unfolded state to a folded state, the upper end of the lifting tube is vertically close to the upper end of the column during the folding process of the frame;

[0029] The height of the foldable trailer in the folded state is smaller than that in the unfolded state, and the height of the foldable trailer becomes shorter after being folded.

[0030] Optionally, a connecting piece is provided at the upper end of the lifting tube, and the connecting piece is connected to a corner of a cloth bag of the folding trailer.

[0031] (III) Beneficial effects

[0032] First, the short tube, as an accessory structure, effectively increases the length of the second fork tube, and simultaneously increases the length of the first fork tube, thereby increasing the unfolding length of the first folding mechanism and the second folding mechanism. When the number of cross components remains unchanged, the volume of the folding trailer after unfolding is increased. If the volume of the folding trailer after unfolding is increased by increasing the number of cross components, the weight of the folding trailer will increase, which is not convenient for carrying the trailer in the vertical direction. Second, when the trailer is unfolded, the angle between the short tube and the column is smaller than the angle between the second fork tube and the column. When the trailer is folded, the first sliding sleeve slides downward and the second sliding sleeve slides toward the first end of the short tube. The smaller the angle between the short tube and the column, the smaller the angle between the direction of the force of the short tube acting on the first sliding sleeve and the axial direction of the column, the greater the first sliding force, and the smoother the sliding of the first sliding sleeve. Third, the short tube reduces the angle between the short tube and the second fork tube. Similarly, the sliding of the second sliding sleeve is smoother, which improves the smoothness of the trailer folding.

[0033] The folding heights of the first cross component, the third cross component, the second cross component, the third folding mechanism, the fourth folding mechanism and the bottom folding mechanism are all no higher than the height of the upper end of the column, ensuring that the trailer does not increase in height after being folded and gathered, making it easier for users to store and carry it. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the folding trailer of the utility model;

[0035] Figure 2 It is a three-dimensional diagram of the folding trailer of the utility model;

[0036] Figure 3 It is a front view of the folding trailer of the utility model;

[0037] Figure 4 It is a left side view of the folding trailer of the utility model;

[0038] Figure 5 It is a right side view of the foldable trailer of the utility model;

[0039] Figure 6 It is a top view of the folding trailer of the utility model;

[0040] Figure 7 It is a structural schematic diagram of the folding state of the folding trailer of the utility model;

[0041] Figure 8 It is a structural schematic diagram of the foldable and low-profile trailer of the utility model;

[0042] Fig. 9 This is a front view of the foldable and low-profile trailer of the utility model;

[0043] Fig.10It is a left side view of the foldable and low-profile trailer of the utility model;

[0044] Fig.11 It is a structural schematic diagram of the foldable and low-profile trailer of the utility model in a folded state.

[0045] [Description of Reference Numerals]

[0046] 1: column; 11: first column; 12: second column; 13: third column; 14: fourth column;

[0047] 2: bottom folding mechanism; 21: first bottom support assembly; 22: second bottom support assembly;

[0048] 210: first bottom connecting piece; 211: first bottom connecting pipe; 212: second bottom connecting pipe; 213: third bottom connecting pipe; 214: fourth bottom connecting pipe; 216: second bottom connecting piece; 215: third bottom connecting piece;

[0049] 31: first folding mechanism; 32: second folding mechanism; 33: third folding mechanism; 34: fourth folding mechanism;

[0050] 311: first cross component; 312: second cross component; 313: third cross component;

[0051] 3111: first fork tube; 3112: second fork tube; 3113: third fork tube; 3114: fourth fork tube;

[0052] 341: first cross tube; 342: second cross tube; 343: third cross tube; 344: fourth cross tube;

[0053] 41: first sliding sleeve; 42: second sliding sleeve;

[0054] 5: Short tube;

[0055] 6: handle mechanism; 60: telescopic rod; 61: first transverse tube; 62: second transverse tube; 63: limiter;

[0056] 71: first suspension rod; 72: second suspension rod;

[0057] 8: Roller;

[0058] 100: lifting tube; 104: connecting piece. DETAILED DESCRIPTION

[0059] In order to better explain the utility model and facilitate understanding, the utility model is described in detail below with reference to the accompanying drawings and through specific implementation methods. Figure 1 The orientation is used as a reference.

[0060] Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0061] like Figure 1-7 As shown, the utility model provides a folding trailer and a folding and shortening trailer, which comprises four columns 1 arranged at intervals in a rectangular shape, a bottom folding mechanism 2 hinged between the four columns 1 and with a hinge point located at the lower end of the column 1, a first folding mechanism 31, a third folding mechanism 33, a second folding mechanism 32 and a fourth folding mechanism 34 sequentially connected between two adjacent columns 1, and a first sliding sleeve 41 slidably arranged on the column 1, and a short tube 5 is hinged on the first sliding sleeve 41. Further, the four columns 1 are respectively the first column 11, the second column 12, the third column 13 and the fourth column 14, and each column 1 is slidably arranged with a first sliding sleeve 41, and each first sliding sleeve 41 is hinged with a short tube 5, and the hinge point is located at the first end of the short tube 5. The first folding mechanism 31 is connected between the first column 11 and the second column 12 , the second folding mechanism 32 is connected between the third column 13 and the fourth column 14 , the third folding mechanism 33 is connected between the second column 12 and the third column 13 , and the fourth folding mechanism 34 is connected between the first column 11 and the fourth column 14 .

[0062] like Figure 2 and Figure 3As shown, the first folding mechanism 31 and the second folding mechanism 32 both include a first cross component 311, a third cross component 313 and a second cross component 312 which are hinged in sequence. The number of the third cross component 313 can be one or more, and the plurality of third cross components 313 are hinged in sequence. The first cross component 311 and the second cross component 312 both include a first fork tube 3111 and a second fork tube 3112 which are hinged to each other. The third cross component 313 includes a third fork tube 3113 and a fourth fork tube 3114 which are hinged to each other. The two ends of the third fork tube 3113 are respectively hinged to the first fork tube 3111 of the first cross component 311 and the second fork tube 3112 of the second cross component 312 in a one-to-one correspondence. The two ends of the fourth fork tube 3114 are respectively hinged to the second fork tube 3112 of the first cross component 311 and the first fork tube 3111 of the second cross component 312 in a one-to-one correspondence. The first cross component 311 and the second cross component 312 have the same structure and are symmetrically positioned. The first fork tube 3111 of the first cross component 311 is hinged to the upper end of the first column 11, and the first fork tube 3111 of the second cross component 312 is hinged to the upper end of the second column 12. Taking the first cross component 311 as an example, the second end of the short tube 5 is hinged to the tube body of the first fork tube 3111 of the first cross component 311, the short tube 5 is provided with a second sliding sleeve 42, and the end of the second fork tube 3112 of the first cross component 311 is hinged to the second sliding sleeve 42 on the short tube 5.

[0063] First, the short tube 5, as an accessory structure, effectively increases the length of the second fork tube 3112, and simultaneously increases the length of the first fork tube 3111, thereby increasing the unfolded length of the first folding mechanism 31 and the second folding mechanism 32. When the number of cross components remains unchanged, the volume of the folding trailer after unfolding is increased. If the volume of the folding trailer after unfolding is increased by increasing the number of cross components, the weight of the folding trailer will increase, which will be inconvenient to carry the trailer in the vertical direction. Second, when the trailer is unfolded, the space between the short tube 5 and the column 1 is The angle is smaller than the angle between the second fork tube 3112 and the column 1. When the trailer is folded, the first sliding sleeve 41 slides downward, and the second sliding sleeve 42 slides toward the first end of the short tube 5. The smaller the angle between the short tube 5 and the column 1, the smaller the angle between the direction of the force applied by the short tube 5 on the first sliding sleeve 41 and the axial direction of the column 1, the greater the first sliding force, and the smoother the sliding of the first sliding sleeve 41; thirdly, the short tube 5 reduces the angle between the short tube 5 and the second fork tube 3112. Similarly, the second sliding sleeve 42 slides more smoothly, which improves the smoothness of the trailer folding. Figure 7 and Fig.11The folding heights of the first cross component 311, the third cross component 313, the second cross component 312, the third folding mechanism 33, the fourth folding mechanism 34 and the bottom folding mechanism 2 are not higher than the height of the upper end of the column 1, ensuring that the trailer does not increase in height after being folded and gathered, making it convenient for users to store and carry.

[0064] In a preferred embodiment, the first folding mechanism 31 and the second folding mechanism 32 are both a first cross component 311, a third cross component 313, and a second cross component 312 which are hinged in sequence, ensuring that the trailer has a larger unfolded volume while having a smaller folded volume, thereby improving the user's usability experience.

[0065] like Figure 2 and Figure 3 As shown, the folding trailer further includes a first suspension rod 71 and a second suspension rod 72. The upper end of the first suspension rod 71 is hinged to the first folding mechanism 31, and the upper end of the second suspension rod 72 is hinged to the second folding mechanism 32. The lower ends of the first suspension rod 71 and the second suspension rod 72 are respectively connected to the front and rear sides of the bottom folding mechanism 2 in a one-to-one correspondence. When the folding trailer is in the unfolded state, an upward pulling force is generated on the bottom folding mechanism 2 to increase the supporting force of the bottom folding mechanism 2. In addition, the first suspension rod 71 and the second suspension rod 72 are both flexible rods, and can even be slings, such as cloth belts, steel cables, etc. During the folding process of the folding trailer, the first suspension rod 71 and the second suspension rod 72 themselves are deformed, and the two ends of the first suspension rod 71 and the second suspension rod 72 are close to each other.

[0066] like Figure 1-3 and Figure 6As shown, the bottom folding mechanism 2 includes a first bottom support assembly 21 and a second bottom support assembly 22 which are symmetrically arranged and hinged to each other, and the first bottom support assembly 21 and the second bottom support assembly 22 both include a first bottom connecting member 210, a first bottom connecting tube 211, a second bottom connecting tube 212, a third bottom connecting tube 213 and a fourth bottom connecting tube 214. Among them, the first ends of the first bottom connecting tube 211, the second bottom connecting tube 212, the third bottom connecting tube 213 and the fourth bottom connecting tube 214 of the first bottom support assembly 21 are all connected to the first bottom connecting member 210 of the first bottom support assembly 21 at a limited angle of rotation, and the first ends of the first bottom connecting tube 211, the second bottom connecting tube 212, the third bottom connecting tube 213 and the fourth bottom connecting tube 214 of the second bottom support assembly 22 are all connected to the first bottom connecting member 210 of the second bottom support assembly 22 at a limited angle of rotation. Specifically, taking the first bottom support assembly 21 as an example, the first bottom connecting member 210 is symmetrically provided with four mounting grooves. When the trailer is unfolded, the bottom of the mounting groove is horizontally arranged and the opening is downward. The first end of each bottom connecting tube is respectively located in the corresponding mounting groove and is rotatably connected with the inner wall of the mounting groove. When each bottom connecting tube rotates upward from the inclined state in the folded state compared to the first bottom connecting member 210 until the tube wall abuts against the bottom of the mounting groove, each bottom connecting tube cannot continue to rotate due to the restriction of the mounting groove, thereby maintaining a horizontal state and providing effective support force for the bottom of the trailer. The second ends of the first bottom connecting tube 211 and the second bottom connecting tube 212 are respectively rotatably connected with the lower end of the corresponding column 1 at a limited angle. The structural form is similar to that of the first bottom connecting member 210, and the only difference is that the notch of the mounting groove is upward, which limits the first bottom connecting tube 211 and the second bottom connecting tube 212 to only be able to rotate downward from the inclined state in the folded state compared to the mounting groove at the lower end of the column 1 to a horizontal state.

[0067] Furthermore, if Figure 1 , Figure 2 and Figure 6As shown, the bottom folding mechanism 2 further includes a symmetrically arranged second bottom connecting member 216 and a third bottom connecting member 215, and the lower ends of the first suspension rod 71 and the second suspension rod 72 are respectively connected to the second bottom connecting member 216 and the third bottom connecting member 215 in a one-to-one correspondence. The third bottom connecting tube 213 of the first bottom support assembly 21 and the second bottom support assembly 22 are both connected to the third bottom connecting member 215 with a limited angle of rotation, and the fourth bottom connecting tube 214 of the first bottom support assembly 21 and the second bottom support assembly 22 are both connected to the second bottom connecting member 216 with a limited angle of rotation, and the connection form is similar to the first bottom connecting member 210, and the only difference is that the notches of the installation grooves on the second bottom connecting member 216 and the third bottom connecting member 215 are upward, limiting the third bottom connecting tube 213 and the fourth bottom connecting tube 214 to only be able to rotate downward to a horizontal state from the inclined state in the folded state compared to the installation grooves on the second bottom connecting member 216 and the third bottom connecting member 215. When the trailer needs to be folded, the two first bottom connecting members 210 are first driven to move upward, and the four bottom connecting tubes connected to the corresponding first bottom connecting members 210 are rotated from the horizontal state when unfolded to the inclined state, and the bottom connecting tubes gather together, thereby driving the four columns 1 to gather together, and the four columns 1 squeeze the first folding mechanism 31, the third folding mechanism 33, the second folding mechanism 32 and the fourth folding mechanism 34 to make them fold and shrink, and the first suspension rod 71 and the second suspension rod 72 themselves are deformed, and the two ends of the first suspension rod 71 and the second suspension rod 72 are close to each other.

[0068] like Figure 1 , Figure 4 and Figure 5 As shown, the third folding mechanism 33 and the fourth folding mechanism 34 both include a first cross tube 341 and a second cross tube 342 that are hinged to each other, and a third cross tube 343 and a fourth cross tube 344 that are hinged to each other, the first ends of the first cross tube 341 and the third cross tube 343 are hinged to each other, and the first ends of the second cross tube 342 and the fourth cross tube 344 are hinged to each other. In the fourth folding mechanism 34, the second end of the first cross tube 341 is hinged to the upper end of the fourth column 14, the second end of the third cross tube 343 is hinged to the upper end of the first column 11, the second end of the second cross tube 342 is hinged to the first sliding sleeve 41 on the fourth column 14, and the second end of the fourth cross tube 344 is hinged to the first sliding sleeve 41 on the first column 11. In the third folding mechanism 33, the second end of the first cross tube 341 is hinged to the upper end of the second column 12, the second end of the third cross tube 343 is hinged to the upper end of the third column 13, the second end of the second cross tube 342 is hinged to the first sliding sleeve 41 on the second column 12, and the second end of the fourth cross tube 344 is hinged to the first sliding sleeve 41 on the third column 13.

[0069] like Figure 1 As shown, the folding trailer also includes a handle mechanism 6, specifically, see Figure 4The handle mechanism 6 includes a telescopic rod 60, a first transverse tube 61, a second transverse tube 62 and a stopper 63, and the telescopic rod 60 is slidably connected to the stopper 63. The first ends of the first transverse tube 61 and the second transverse tube 62 are respectively rotatably connected to the two ends of the stopper 63 in a one-to-one correspondence. Specifically, the first end of the first transverse tube 61 is rotatably connected to the first end of the stopper 63, and the first end of the second transverse tube 62 is rotatably connected to the second end of the stopper 63. The first transverse tube 61 and the second transverse tube 62 are restricted by the stopper 63, and the first transverse tube 61 and the second transverse tube 62 can only rotate upward around the stopper 63 from the inclined state in the folded state to nearly horizontal, or rotate downward around the stopper 63 from the inclined state in the unfolded state to nearly vertical. When folding, after the first transverse tube 61 and the second transverse tube 62 rotate, the telescopic rod 60 slides downward to reduce the height of the telescopic rod 60. At the same time, through the contraction of the telescopic rod 60 itself, the height of the telescopic rod 60 is further reduced, so that the height of the handle mechanism 6 after folding and contraction is not higher than the height of the column 1. The second ends of the first transverse tube 61 and the second transverse tube 62 are respectively connected to the rotating members rotatably arranged at the lower ends of the first column 11 and the fourth column 14 in a one-to-one corresponding manner. The rotation axis of the rotating member is perpendicular to the rotation axis of the first cross bar and the second cross bar. When the rotating member rotates itself, the free end of the telescopic rod 60 moves away from the trailer or close to the trailer. When the free end of the telescopic rod 60 is away from the trailer, there is a certain angle between the telescopic rod 60 and the plane where the first column 11 and the fourth column 14 are located, which is convenient for users to drag. The second end of the telescopic rod 60 is connected to a pull ring, which is further convenient for users to drag the trailer. The lower end of any column 1 is provided with a roller 8. Preferably, the roller 8 provided at the lower ends of the first column 11 and the fourth column 14 is a universal wheel, which is convenient for the turning operation of the trailer.

[0070] like Figure 8-11 As shown, the utility model also provides a foldable and low-profile trailer, which includes a lifting tube and the above-mentioned foldable trailer. The structure of the foldable trailer is shown in Figure 1-7 , wherein a lifting tube 100 is hinged on each second sliding sleeve 42 on the folding trailer, and the hinge point is located at the lower end of the lifting tube 100. Taking the connection structure between the first cross component 311 and the lifting tube 100 as an example, the lower end of the lifting tube 100 is hinged to the second sliding sleeve 42 on the short tube 5 connected to the first cross component 311, and the tube body of the lifting tube 100 is slidably connected to the top foot fixing piece at the upper end of the first column 11. The upper ends of the four lifting tubes 100 are respectively connected to the four corners of the cloth bag of the folding trailer in a one-to-one correspondence. When the folding trailer is in the process of changing from the unfolded state to the folded state, the upper end of the lifting tube 100 slides downward, thereby reducing the height of the folding trailer.

[0071] See also Figure 8-10When the foldable trailer changes from a folded state to an unfolded state, the upper end of the lifting tube 100 moves away from the upper end of the pillar 1 in the vertical direction, and the top of the trailer's cloth bag is lifted upward to be higher than the upper end of the pillar 1 through the lifting tube 100, thereby increasing the overall height of the trailer and thus increasing the volume of the trailer. When the foldable trailer changes from an unfolded state to a folded state, the upper end of the lifting tube 100 moves closer to the upper end of the pillar 1 in the vertical direction, thereby making the height of the foldable trailer in the folded state less than that in the unfolded state, and the height of the foldable trailer becomes shorter after folding. Specifically, during the unfolding process of the trailer, the upper end of the lifting tube 100 slides upward and away from the upper end of the pillar 1, and the unfolded state is shown in FIG. Figure 8 and Fig. 9 , so that the height of the trailer after unfolding is greater than the height when folded, increasing the volume of the trailer; during the folding process of the trailer, the upper end of the lifting tube 100 slides down close to the upper end of the column 1, and the state after folding is shown in FIG. Fig.11 , so that the height of the trailer after folding is less than the height in the unfolded state. The trailer becomes shorter after folding, and the folded volume is reduced, which is more convenient for users to carry and store.

[0072] Furthermore, a connector 104 is disposed at the upper end of the lifting tube 100, and the connector 104 is connected to a corner of the fabric bag of the folding trailer.

[0073] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0074] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0076] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0077] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A folding trailer, characterized in that: The folding trailer comprises four columns (1) arranged at intervals in a rectangular shape, a bottom folding mechanism (2) hinged between the four columns (1), a first folding mechanism (31), a third folding mechanism (33), a second folding mechanism (32) and a fourth folding mechanism (34) sequentially connected between two adjacent columns (1), and a first sliding sleeve (41) slidably arranged on the column (1), wherein a short tube (5) is hingedly connected to the first sliding sleeve (41); The first folding mechanism (31) and the second folding mechanism (32) both comprise a first cross component (311), at least one third cross component (313), and a second cross component (312) which are hinged in sequence; the first cross component (311) and the second cross component (312) both comprise a first fork tube (3111) and a second fork tube (3112), the first fork tube (3111) being hinged to the upper end of the corresponding column (1), and the short tube (5) being hinged to the first fork tube (3111); a second sliding sleeve (42) is provided on the short tube (5), and the second fork tube (3112) is hinged to the second sliding sleeve (42) on the corresponding short tube (5); The folding heights of the first cross component (311), the third cross component (313), the second cross component (312), the third folding mechanism (33), the fourth folding mechanism (34) and the bottom folding mechanism (2) are not higher than the height of the upper end of the column (1).

2. The folding trailer according to claim 1, characterized in that: The first folding mechanism (31) and the second folding mechanism (32) are both a first cross component (311), a third cross component (313), and a second cross component (312) which are hinged in sequence.

3. The folding trailer according to claim 1, characterized in that: The folding trailer further comprises a first suspension rod (71) and a second suspension rod (72). The upper end of the first suspension rod (71) is hinged to the first folding mechanism (31), the upper end of the second suspension rod (72) is hinged to the second folding mechanism (32), and the lower ends of the first suspension rod (71) and the second suspension rod (72) are both connected to the bottom folding mechanism (2); The first suspension rod (71) and the second suspension rod (72) are both flexible rods. During the folding process of the foldable trailer, the first suspension rod (71) and the second suspension rod (72) are deformed, and both ends of the first suspension rod (71) and the second suspension rod (72) are brought closer to each other.

4. The folding trailer according to claim 3, characterized in that: The bottom folding mechanism (2) comprises a first bottom support assembly (21) and a second bottom support assembly (22) which are symmetrically arranged and hinged to each other, and the first bottom support assembly (21) and the second bottom support assembly (22) each comprise a first bottom connecting member (210), a first bottom connecting tube (211), a second bottom connecting tube (212), a third bottom connecting tube (213) and a fourth bottom connecting tube (214); The first ends of the first bottom connecting tube (211), the second bottom connecting tube (212), the third bottom connecting tube (213) and the fourth bottom connecting tube (214) are all connected to the first bottom connecting member (210) in a rotational manner at a limited angle; The second ends of the first bottom connecting tube (211) and the second bottom connecting tube (212) are respectively connected to the lower ends of the corresponding columns (1) in a rotational manner at a limited angle.

5. The folding trailer according to claim 4, characterized in that: The bottom folding mechanism (2) further comprises a second bottom connecting member (216) and a third bottom connecting member (215) which are symmetrically arranged, and the lower ends of the first suspension rod (71) and the second suspension rod (72) are respectively connected to the second bottom connecting member (216) and the third bottom connecting member (215) in a one-to-one correspondence; The third bottom connecting pipe (213) of the first bottom supporting assembly (21) and the second bottom supporting assembly (22) are both rotatably connected to the third bottom connecting member (215) at a limited angle; The fourth bottom connecting pipe (214) of the first bottom supporting assembly (21) and the second bottom supporting assembly (22) are both rotatably connected to the second bottom connecting member (216) at a limited angle.

6. The folding trailer according to claim 1, characterized in that: The four columns (1) are respectively a first column (11), a second column (12), a third column (13) and a fourth column (14); The third folding mechanism (33) and the fourth folding mechanism (34) both comprise a first cross tube (341) and a second cross tube (342) hinged to each other, and a third cross tube (343) and a fourth cross tube (344) hinged to each other, wherein the first ends of the first cross tube (341) and the third cross tube (343) are hinged to each other, and the first ends of the second cross tube (342) and the fourth cross tube (344) are hinged to each other; In the fourth folding mechanism (34), the second end of the first cross tube (341) is hinged to the upper end of the fourth column (14), the second end of the third cross tube (343) is hinged to the upper end of the first column (11), the second end of the second cross tube (342) is hinged to the first sliding sleeve (41) on the fourth column (14), and the second end of the fourth cross tube (344) is hinged to the first sliding sleeve (41) on the first column (11); In the third folding mechanism (33), the second end of the first cross tube (341) is hinged to the upper end of the second column (12), the second end of the third cross tube (343) is hinged to the upper end of the third column (13), the second end of the second cross tube (342) is hinged to the first sliding sleeve (41) on the second column (12), and the second end of the fourth cross tube (344) is hinged to the first sliding sleeve (41) on the third column (13).

7. The folding trailer according to claim 1, characterized in that: The folding trailer also includes a handle mechanism (6); The handle mechanism (6) comprises a telescopic rod (60), a first transverse tube (61), a second transverse tube (62) and a stopper (63), and the telescopic rod (60) is slidably connected to the stopper (63); The first ends of the first transverse tube (61) and the second transverse tube (62) are respectively rotatably connected to the two ends of the limit member (63) at a limited angle, and the second ends of the first transverse tube (61) and the second transverse tube (62) are respectively rotatably connected to the lower ends of the two uprights (1) connected to the fourth folding mechanism (34) in a one-to-one correspondence.

8. A foldable and low-profile trailer, characterized in that: The foldable and shortened trailer comprises a lifting tube and the foldable trailer according to any one of claims 1 to 7, one end of the lifting tube (100) being hinged to the second sliding sleeve (42); the lifting tube (100) being slidably connected to the upper end of the corresponding column (1), and the upper ends of four lifting tubes (100) being respectively connected to the four corners of the cloth bag of the foldable and shortened trailer in a one-to-one correspondence; When the foldable trailer is transformed from a folded state to an unfolded state, the upper end of the lifting tube (100) is vertically away from the upper end of the column (1) during the process of the frame unfolding; when the foldable trailer is transformed from an unfolded state to a folded state, the upper end of the lifting tube (100) is vertically close to the upper end of the column (1) during the process of the frame folding; The height of the foldable trailer in the folded state is smaller than that in the unfolded state, and the height of the foldable trailer becomes shorter after being folded.

9. The foldable and low-profile trailer according to claim 8, characterized in that: The upper end of the lifting tube (100) is provided with a connecting piece (104), and the connecting piece (104) is connected to the corner of the cloth bag of the folding trailer.

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