Portable folding trailer
Patent Information
- Application Number
- JP2024004319U
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Priority Date
- 2024-07-15
- Filing Date
- 2024-12-23
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-12-23
Smart Images
Figure 0003250330000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to portable trailers, and more particularly to portable folding trailers. [Background technology]
[0002] An existing portable folding trailer, as described in CN108725533A, for example, comprises a trailer frame including a folding frame and a wheel mechanism that can be attached to the folding frame. The folding frame includes two first scissors mechanisms spaced apart from each other on the left and right and two second scissors mechanisms spaced apart from each other on the front and rear, the first scissors mechanisms are provided with two first scissors units, and the second scissors mechanism is provided with one second scissors unit. The two first scissors mechanisms and the two second scissors mechanisms are connected to surround a rectangular structure, and the upper ends of the adjacent first scissors unit and second scissors unit are rotatably connected by a first upper pedestal, and the lower ends of the adjacent first scissors unit and second scissors unit are rotatably connected by a first lower pedestal. The upper ends of the die rods of the two adjacent first pincer units of the first pincer mechanism are arranged on the left and right and connected by a pivot, and the pivot axes of the upper ends of the two die rods are located on the same axis, and the above-mentioned connection makes the width of the upper base larger than at least the sum of the outer diameters of the two die rods, and the large width of the upper base leads to a narrower width of the space inside the trailer, so further improvement is required.In addition, for example, CN103587562B, CN103895672B, and US9073564B2, like CN108725533A, also connect the die rods of the two adjacent first pincer units by one axis, and also have the above-mentioned defects. Summary of the Invention [Problem to be solved by the invention]
[0003] The present invention provides a portable folding trailer that overcomes the deficiencies of portable folding trailers in the background art. [Means for solving the problem]
[0004] The technical means by which the present invention solves the technical problem are as follows:
[0005] The portable folding trailer comprises a trailer frame including a folding frame and a wheel mechanism that can be attached to the folding frame, the folding frame including two first scissor mechanisms arranged at a distance from one another on the left and right side and two second scissor mechanisms arranged at a distance from one another on the front and rear side, the first scissor mechanisms are provided with at least two first scissor units, the second scissor mechanisms are provided with at least two second scissor units, the two first scissor mechanisms and the two second scissor mechanisms are connected to surround a rectangular structure, the upper ends of adjacent first scissor units and second scissor units are rotatably connected by a first upper pedestal, and the adjacent The lower ends of the first scissors unit and the second scissors unit are rotatably connected by a first lower base, of which a second upper base and a second lower base are further provided in the middle part of the first scissors mechanism, the second upper base is provided with two upper pivot positions spaced apart from each other in the front-to-back direction and aligned in the left-to-right direction, the second lower base is provided with two lower pivot positions, the upper part of the die rod between two adjacent first scissors units is bent and positioned, the upper ends of the two adjacent first scissors units are respectively pivotally connected to the two upper pivot positions of the second upper base, and the lower ends of the two adjacent first scissors units are respectively pivotally connected to the two lower pivot positions of the second lower base.
[0006] In one embodiment, a first set of telescopic rods are connected between corresponding first upper and first lower pedestals, and a second set of telescopic rods are connected between corresponding second upper and second lower pedestals.
[0007] In one embodiment, the second lower pedestal is provided with two spaced apart and offset lower pivot locations.
[0008] In one embodiment, the first scissors unit and the second scissors unit each include two die rods whose middle portions are rotatably connected, and the two die rods of the first scissors unit are arranged crossing inward and outward, and in two adjacent first scissors units, the upper part of the die rod located on the inside of one first scissors unit is bent outward and rotatably connected to an upper pivot position of the second upper base, while the upper part of the die rod located on the outside of the other first scissors unit is rotatably connected to another upper pivot position of the second upper base.
[0009] In one embodiment, the folding frame further includes a bottom frame, which includes a radial mechanism that is the same number as the first scissors units of the first scissors mechanism and arranged in the front-to-rear direction, and the radial mechanism includes a central base and four bottom bars rotatably connected to the central base, with the ends of two bottom bars rotatably connected to two first lower pedestals respectively, while the ends of the other two bottom bars rotatably connected to two second lower pedestals respectively.
[0010] In one embodiment, the wheel mechanism is located below the first lower seat and is detachably connected to the folding frame.
[0011] In one embodiment, the wheel mechanism includes a U-shaped wheel frame, a wheel, and a first connecting shaft, the U-shaped wheel frame includes a common plate and a divided plate respectively connected to both sides of the common plate, the wheel is rotatably connected between the two divided plates, the first connecting shaft is attached to the common plate and is detachably attached to the folding frame, a first annular groove is recessed on the upper part of the first connecting shaft, the first telescopic rod group includes an outer tube and an inner tube slidably disposed in the outer tube, the first lower seat is fixed to the bottom of the outer tube, and the top of the inner tube is fixed to the first upper seat. The external tube is fixed to a base, a mounting member is further fixed to the bottom of the external tube, a horizontal slide groove is provided in the mounting member, an outer through hole penetrating inwardly and outwardly is provided in a region of the external tube corresponding to the slide groove, a fixed sleeve is further fixed within the bottom of the external tube, an inner through hole corresponding to the outer through hole is provided in the fixed sleeve, the first connecting shaft is inserted into the fixed sleeve, a slide base that is horizontally slidable is in sliding contact with the slide groove of the mounting member, a first insertion portion is provided on the slide base, and the first insertion portion enters the outer through hole and the inner through hole and is inserted into the first annular groove.
[0012] In one embodiment, the slide base includes a first side plate and a second side plate fixed relative to each other and arranged horizontally spaced apart, the first side plate is provided outside a first side on which an external through hole of the external tube is provided, the first insertion portion is fixed to the first side plate, the second side plate is located outside a second side opposite to the first side of the external tube, and an elastic body is provided between the second side plate and the external tube.
[0013] In one embodiment, the slide base includes a rectangular frame, two opposing side plates of which form the first side plate and the second side plate described above, the external tube is positioned inside the rectangular frame, and the mounting member includes a lower mounting portion and an upper mounting portion, and the upper mounting portion and the lower mounting portion form the slide groove described above.
[0014] In one embodiment, the wheel mechanism includes a support frame and wheels rotatably connected to both sides of the support frame, the first telescopic rod group includes an outer tube and an inner tube slidably disposed in the outer tube, the first lower base is fixed to the bottom of the outer tube, the top of the inner tube is fixed to the first upper base, a second connecting shaft is fixed to the bottom of the outer tube, and the support frame and the second connecting shaft are detachably connected; A second annular groove is recessed into the lower part of the second connecting shaft, an insertion hole is recessed into the support frame, a first through hole is provided in the support frame penetrating the inside and outside of the insertion hole, the second connecting shaft is inserted into the insertion hole, the wheel mechanism further includes an L-shaped frame, a middle part of the L-shaped frame is rotatably connected to the bottom of the support frame, an elastic body is provided between one end of the L-shaped frame and the support frame, and a second insertion part is fixed to the other end, and the second insertion part enters the first through hole and is inserted into the second annular groove. Effect of the Invention
[0015] The present technical form has the following advantages over the background art.
[0016] The second upper base is provided with two upper pivot positions spaced apart from each other in the front-to-back direction and aligned from left to right, and the second lower base is provided with two lower pivot positions, and the upper part of the die rod between two adjacent first scissors units is bent and arranged, and the upper ends of the two adjacent first scissors units are respectively pivoted to the two upper pivot positions of the second upper base, and the lower ends are respectively pivoted to the two lower pivot positions of the second lower base, thereby reducing the width of the second upper base and increasing the width of the internal space of the trailer frame, and the die rod is connected to different pivot positions of the second upper base and the second lower base, and the rotation axes between the die rods of the two adjacent first scissors units and the second upper base are respectively independent, thereby improving the connection strength. [Brief description of the drawings]
[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. [Figure 1] FIG. 1 is a schematic perspective view of a trailer according to a first embodiment. [Diagram 2] FIG. 2 is a schematic perspective view of the trailer frame of the first embodiment in an unfolded state. [Diagram 3] FIG. 2 is a schematic perspective view of the trailer frame of the first embodiment in a semi-folded state. [Figure 4] FIG. 2 is a schematic perspective view of the trailer frame of the first embodiment in a folded state and with the die rod mechanism deployed. [Diagram 5] 1 is a schematic perspective view of the trailer frame of the first embodiment in a folded state and the die rod mechanism in a semi-folded state. FIG. [Figure 6] FIG. 2 is a schematic perspective view of the trailer frame of the first embodiment in a folded state and the die rod mechanism folded. [Figure 7] FIG. 2 is a schematic perspective view of the trailer frame of the first embodiment in a folded state with the wheel mechanism removed. [Figure 8] FIG. 2 is a schematic perspective view of the wheel mechanism of the trailer frame of the first embodiment in a disassembled state. [Figure 9] FIG. 2 is a front schematic view of a wheel mechanism of the trailer frame of the first embodiment. [Figure 10] FIG. 10 is a schematic diagram of a local portion of the AA cross section of FIG. [Figure 11] FIG. 9 is an enlarged schematic view of a local portion of FIG. 8. [Figure 12] FIG. 11 is an enlarged schematic view of a portion B in FIG. [Figure 13] FIG. 10 is a schematic diagram of a local portion of cross section CC in FIG. [Figure 14] FIG. 11 is a schematic perspective view of the trailer frame of the second embodiment in an unfolded state. [Figure 15] FIG. 11 is a schematic perspective view of the trailer frame of the third embodiment in an unfolded state. [Figure 16]FIG. 11 is a schematic perspective view of the trailer frame of the third embodiment in a folded state. [Figure 17] FIG. 11 is a schematic perspective view of the trailer frame of the third embodiment in a folded state with the wheel mechanism removed. [Figure 18] FIG. 11 is a schematic perspective view of a wheel mechanism of a trailer frame according to a third embodiment in a disassembled state. [Figure 19] FIG. 19 is an enlarged schematic view of a local portion of FIG. 18. [Figure 20] FIG. 11 is an enlarged schematic diagram of a local portion of a wheel mechanism of a trailer frame of a third embodiment. [Figure 21] FIG. 11 is another schematic diagram showing an enlarged view of a local portion of the wheel mechanism of the trailer frame of the third embodiment. [Figure 22] FIG. 11 is a schematic perspective view of the trailer frame of the fourth embodiment in an unfolded state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0018] <Example 1> 1 to 13, the portable folding trailer includes a trailer frame 100 and a trailer fabric 200, and the trailer frame 100 includes a folding frame 10 and a wheel mechanism 20 mountable to the folding frame 10.
[0019] The folding frame 10 includes two first scissors mechanisms 11 arranged at an interval from left to right and two second scissors mechanisms 12 arranged at an interval from front to back. Two first scissors units 111 are provided in the first scissors mechanism, and two second scissors units 121 are provided in the second scissors mechanism 12, and the two first scissors mechanisms 11 and the two second scissors mechanisms 12 are connected to surround a rectangular structure. The upper ends of adjacent first scissors units 111 and second scissors units 121 are rotatably connected by a first upper pedestal 131, and the lower ends of adjacent first scissors units 111 and second scissors units 121 are rotatably connected by a first lower pedestal 132, and a first telescopic rod group 133 is connected between the corresponding first upper pedestal 131 and first lower pedestal 132. A second upper pedestal 141 and a second lower pedestal 142 are further provided in the middle of the first scissors mechanism 11, and a second telescopic rod group 143 is connected between the corresponding second upper pedestal 141 and second lower pedestal 142. The second upper pedestal 141 is provided with two upper pivot positions 1411 spaced apart in the front-rear direction and aligned left-right, and the second lower pedestal 142 is provided with two lower pivot positions 1421 spaced apart in the front-rear direction and offset left-right. The upper portions of the die rods 112 of the two adjacent first scissors units 111 are bent and arranged, and the upper ends of the two adjacent first scissors units 111 are respectively pivotally attached to two upper pivot positions 1411 of the second upper base 141, and the lower ends are respectively pivotally attached to two lower pivot positions 1421 of the second lower base. The upper portions of the die rods 112 are bent and arranged, so that the die rods 112 have a Z-shaped structure. The first scissors unit 111 and the second scissors unit 121 each include two die rods whose middle portions are rotatably connected.The two die rods of the first scissors unit are arranged crossing inward and outward, and in two adjacent first scissors units 111, the upper part of the die rod 112 located inside one of the first scissors units 111 is bent outward and rotatably connected to one upper pivot position 1411 of the second upper pedestal 141, while the upper part of the die rod located outside the other first scissors unit 111 is rotatably connected to the other upper pivot position 1411 of the second upper pedestal 141. As a result, the width of the second upper pedestal of the trailer frame is reduced to correspond to the outer positions of the two die rods of the first scissors unit arranged crossing inward and outward, and the width of the interior space of the trailer frame is increased, thereby increasing the interior space of the trailer frame. The die rods of the two first scissors units and the second upper base 141 are each connected by an independently arranged pivot, and the die rods of the two first scissors units and the second lower base 142 are each connected by an independently arranged pivot.
[0020] The folding frame 10 further includes a bottom frame, which includes radial mechanisms 15 arranged in the front-rear direction and the number of the radial mechanisms 15 is the same as the number of first scissors units 111 of the first scissors mechanism 11. The radial mechanisms 15 include a central base 151 and four bottom bars 152 rotatably connected to the central base 151. The ends of the two outer bottom bars 152 are rotatably connected to the two first lower pedestals 132, respectively, and the ends of the other two bottom bars 152 are rotatably connected to the two second lower pedestals 142, respectively, so that the entire bottom frame can be stored or unfolded as the trailer frame is folded. In addition, a position restriction mechanism is provided on the central base 151, so that the bottom bars 152 in the unfolded state have a maximum opening angle, improving stability. For example, the opening of the pivot groove provided on the central base faces downward, and the position restriction is realized by the groove bottom of the pivot groove or the top provided at the outer end of the pivot groove.
[0021] The wheel mechanism 20 is located below the first lower base 132 and is removably connected to the folding frame 10, making it possible to remove the wheel mechanism 20, which occupies less space after folding and makes storage and transportation easier.
[0022] The wheel mechanism 20 includes a U-shaped wheel frame 21, a wheel 22, and a first connecting shaft 23. The U-shaped wheel frame 21 has a common plate and divided plates respectively fixed to both sides of the common plate, the wheel 22 is rotatably connected between the two divided plates of the U-shaped wheel frame 21 by a pivot, and the first connecting shaft 23 is fixed vertically to the common plate of the U-shaped wheel frame 21 and detachably attached to the folding frame 10. In a specific configuration, the first telescopic rod group 133 includes an outer tube 1331 and an inner tube 1332 slidably installed in the outer tube 1331, the first lower base 132 is fixed outside the bottom of the outer tube 1331, and the top of the inner tube 1332 is fixed to the first upper base 131. A mounting member is fixed to the bottom of the external tube 1331, a horizontal slide groove 24 is provided in the mounting member, an outer through hole 25 is provided in a region of the external tube 1331 corresponding to the slide groove 24, a sleeve 26 is fixed from bottom to top to the bottom of the external tube 1331, and an inner through hole 27 corresponding to the outer through hole 25 is provided in the fixed sleeve 26 (a protruding ring is provided on the lower peripheral edge of the fixed sleeve 26 according to needs, and when the protruding ring abuts against the bottom of the external tube 1331, the inner through hole and the outer through hole are aligned, for example, the axes are aligned and / or the peripheries of the holes are aligned). A first annular groove 231 is recessed in the outer peripheral wall of the upper part of the first connecting shaft 23. The first connecting shaft 23 is inserted into the fixed sleeve 26, the first annular groove 231 and the inner through hole 27 are aligned, and a slide base 28 that is horizontally slidable is further brought into sliding contact with the slide groove 24 of the mounting member, and a first insertion portion 281 is provided on the slide base 28, and the first insertion portion 281 enters the outer through hole 25 and the inner through hole 27 and is inserted into the first annular groove 231, thereby locking the wheel mechanism 20 and the first telescopic rod group 133 in the axial direction, thereby enabling convenient attachment and detachment of the wheel mechanism 20 and the folding frame 10 and ensuring a reliable and stable connection.
[0023] In this embodiment, the slide base 28 includes a first side plate 282 and a second side plate 283 which are fixed relative to each other and horizontally spaced apart from each other. The first side plate 282 is located outside the first side where the outer through hole 25 of the external tube 1331 is provided, and the first insertion part 281 is fixed to the first side plate 282. The second side plate 283 is located outside the second side opposite to the first side of the external tube 1331, and a first elastic body 284 is provided between the second side plate 283 and the external tube 1331. When pressed, the elastic body is stored and the first insertion part is released from the first annular groove. When the pressing force is released, the elastic body is released and can enter the fixed sleeve 26 and be inserted into the first annular groove, realizing automatic locking and improving the convenience of locking. Preferably, the slide base 28 includes a rectangular frame, two opposing side plates of which constitute the first and second side plates, and the external tube is located within the rectangular frame, which makes the structure sturdy and easy to operate. The mounting member includes a lower mounting part 291 and an upper mounting part 292, which constitute the slide groove 24 between the upper mounting part and the lower mounting part, which makes production and assembly easier.
[0024] If necessary, the trailer frame 100 further includes a first die rod mechanism 30, which includes a first mounting seat 31, two first die rods 32 each pivotally connected to the first mounting seat 31, and a first gripping lever 33 attached to the first mounting seat 31, with the first gripping lever and the first die rod being located on both sides of the first mounting seat. The two first die rods 32 are pivotally connected to two first lower seats 132 each located on the second pincer mechanism 12, so that the two first die rods 32 approach or deploy according to the storage or deployment of the trailer frame 100. The first gripping lever 33 is pivotally connected to the first mounting seat 31, and a locking mechanism is provided so that the first gripping lever can swing between a first position and a second position. When the first gripping lever is located in the first position, the first gripping lever and the first die rod are located on either side of the first mounting seat, and the locking mechanism locks them to be held in the first position, but when the locking mechanism is released and the first gripping lever is rotated to the second position, the first gripping lever and the first die rod abut against each other.
[0025] The trailer fabric 200 includes a base fabric and a peripheral wall extending upward from the periphery of the base fabric, with a first upper base 131 and a second upper base 141 connected to the upper periphery of the peripheral wall, and a central seat 151, a first lower base 132, and a second lower base 142 connected to the base fabric.
[0026] <Example 2> 14, the difference between the portable folding trailer of this embodiment and the first embodiment is that the two die rods of one of the two second pinch mechanisms 12 are pivotally connected by an intermediate seat 122 provided with two intermediate pivot positions, and the first die rods 32 of the first die rod mechanism 30 are pivotally connected to the two intermediate pivot positions, respectively, and the two first die rods abut against each other. If necessary, one first die rod may be provided, and the first die rod may be fixed to the first mounting seat.
[0027] <Example 3> 15 to 21, the portable folding trailer of this embodiment differs from that of the first embodiment in that the wheel mechanism 20 includes a support frame 201 and two wheels 22 rotatably connected to both sides of the support frame 201, a second connecting shaft 202 is fixed to the bottom of the external tube 1331, and the support frame 201 and the second connecting shaft 202 are detachably connected. In a specific structure, an insertion hole 203 is recessed in the support frame 201, a first through hole 204 is provided in the support frame 201 that penetrates the insertion hole 203 from the inside to the outside, a second annular groove 205 is recessed in the lower part of the second connecting shaft 202, and the second connecting shaft 202 is inserted into the insertion hole 203. The wheel mechanism 20 further includes an L-shaped frame 206, the middle part of which is rotatably connected to the bottom part of the support frame 201, a second elastic body 207 is provided between one end of the L-shaped frame 206 and the bottom part of the support frame 201, and a second insertion part 208 is fixed to the other end, and the second insertion part 208 enters the first through hole 204 and is inserted into the second annular groove 205. When one end of the L-shaped frame 206 is pressed, the elastic body is compressed and stored, and the second insertion part 208 at the other end is released from the second annular groove, allowing the wheel mechanism to be removed, but when the pressure is released, the elastic body is released, and the second insertion part 208 at the other end is inserted into the first through hole and then into the second annular groove by the elastic force, which makes it easy to operate, simple in structure, and small in space. If necessary, the wheel mechanism may be provided with a brake mechanism 209.
[0028] <Example 4> Referring to Figure 22, the difference between the portable folding trailer of this embodiment and Example 1 is that the first scissors mechanism 11 includes three first scissors units 111, and any two adjacent first scissors units 111 are provided with the above-mentioned second upper base 141 and second lower base 142, and any two adjacent first scissors units 111 have first scissors units 111 in which the upper part of the die rod 112 is folded, resulting in a smaller width of all second upper bases 141.
[0029] The above description is merely a preferred embodiment of the present invention, and the scope of the present invention is not limited thereby; that is, any equivalent changes and modifications based on the scope of the utility model registration claims and the content of the specification of the present invention should be included within the comprehensive scope of the present invention. [Explanation of symbols]
[0030] 100 trailer frame 200 Trailer Fabric 10 Folding Frame 11 First scissor mechanism 111 First Scissor Unit 112 Die Rod 12 Second scissor mechanism 121 Second scissors unit 131 First Upper Pedestal 132 First Lower Pedestal 133 First telescopic rod group 1331 External tube 1332 Inner Tube 141 Second Upper Pedestal 142 Second Lower Pedestal 143 Second Telescopic Rod Group 1411 Upper pivot position 1421 Lower pivot position 15 Radiation mechanism 151 Central Base 152 Bottom Bar 20 Wheel mechanism 21 U-shaped wheel frame 22 wheels 23 First connecting shaft 231 First annular groove 24 Slide groove 25 Outer through hole 26 Fixed sleeve 27 Inner through hole 28 Slide Base 281 First Insertion Part 282 First side panel 283 Second side panel 284 First Elastic Body 291 Lower mounting part 292 Upper mounting part 30 First die rod mechanism 31 First mounting seat 32 First Die Rod 33 First gripping lever 122 Middle seat 201 Support Frame 202 Second connecting shaft 203 Insertion hole 204 First through hole 205 Second annular groove 206 L-shaped frame 207 Second Elastic Body 208 Second Insertion Part
Claims
1. A portable folding trailer, comprising: The trailer frame includes a folding frame and a wheel mechanism that can be attached to the folding frame, the folding frame includes two first scissor mechanisms arranged at a distance from each other on the left and right sides and two second scissor mechanisms arranged at a distance from each other on the front and rear sides, the first scissor mechanism is provided with at least two first scissor units, the second scissor mechanism is provided with at least two second scissor units, the two first scissor mechanisms and the two second scissor mechanisms are connected to surround a rectangular structure, upper ends of adjacent first scissor units and second scissor units are rotatably connected by a first upper pedestal, and lower ends of adjacent first scissor units and second scissor units are rotatably connected by a first lower pedestal, among which: a second upper base and a second lower base are further provided at an intermediate portion of the first scissor mechanism, the second upper base is provided with two upper pivot positions spaced apart from each other in the front-to-back direction and aligned in the left-to-right direction, the second lower base is provided with two lower pivot positions, an upper portion of a die rod between two adjacent first scissor units is folded and positioned, and upper ends of the two adjacent first scissor units are respectively pivotally connected to the two upper pivot positions of the second upper base and lower ends of the two adjacent first scissor units are respectively pivotally connected to the two lower pivot positions of the second lower base.
2. 2. The portable folding trailer according to claim 1, wherein a first group of telescopic rods is connected between corresponding first upper pedestals and first lower pedestals, and a second group of telescopic rods is connected between corresponding second upper pedestals and second lower pedestals.
3. 2. The portable folding trailer of claim 1, wherein said second lower platform is provided with two lower pivot points spaced apart from one another and offset from one another.
4. 2. The portable folding trailer according to claim 1, wherein the first and second pincer units each include two die rods whose middle portions are rotatably connected, the two die rods of the first pincer units are arranged crossing each other inward and outward, and in two adjacent first pincer units, the upper portion of the die rod located on the inside of one first pincer unit is bent outward and rotatably connected to an upper pivot position of the second upper base, while the upper portion of the die rod located on the outside of the other first pincer unit is rotatably connected to another upper pivot position of the second upper base.
5. 2. The portable folding trailer according to claim 1, wherein the folding frame further includes a bottom frame, the bottom frame including radial mechanisms arranged in the front-to-rear direction and the number of the radial mechanisms is the same as the number of first scissors units of the first scissors mechanism, the radial mechanisms including a central base and four bottom bars rotatably connected to the central base, the ends of two bottom bars being rotatably connected to two first lower pedestals respectively, while the ends of the other two bottom bars being rotatably connected to two second lower pedestals respectively.
6. 2. The portable folding trailer according to claim 1, wherein the wheel mechanism is located below the first lower base and is detachably connected to the folding frame.
7. The wheel mechanism includes a U-shaped wheel frame, a wheel, and a first connecting shaft, the U-shaped wheel frame includes a common plate and a split plate connected to both sides of the common plate, the wheel is rotatably connected between the two split plates, the first connecting shaft is attached to the common plate and is detachably attached to the folding frame, 3. The portable folding trailer according to claim 2, wherein a first annular groove is recessed on an upper portion of the first connecting shaft, the first telescopic rod group includes an outer tube and an inner tube slidably arranged within the outer tube, the first lower seat is fixed to a bottom portion of the outer tube, a top portion of the inner tube is fixed to the first upper seat, a mounting member is further fixed to the bottom portion of the outer tube, the mounting member is provided with a horizontal slide groove, and an outer through hole penetrating from inside to outside is provided in an area of the outer tube corresponding to the slide groove, a fixing sleeve is further fixed within the bottom portion of the outer tube, and an inner through hole corresponding to the outer through hole is provided in the fixing sleeve, the first connecting shaft is inserted into the fixing sleeve, a slide base slidable in the horizontal direction is in sliding contact with the slide groove of the mounting member, and a first insertion portion is provided on the slide base, and the first insertion portion enters the outer through hole and the inner through hole to be inserted into the first annular groove.
8. 8. The portable folding trailer according to claim 7, wherein the slide base includes a first side plate and a second side plate fixed relative to each other and arranged at a horizontal distance from each other, the first side plate being provided on the outside of a first side on which an outer through-hole of the outer tube is provided, the first insertion portion being fixed to the first side plate, the second side plate being located on the outside of a second side opposite to the first side of the outer tube, and an elastic body being provided between the second side plate and the outer tube.
9. The portable folding trailer according to claim 8, characterized in that the slide base includes a rectangular frame, two opposing side plates of the rectangular frame form the first side plate and the second side plate, the external tube is positioned inside the rectangular frame, the mounting member includes a lower mounting portion and an upper mounting portion, and the slide groove is formed between the upper mounting portion and the lower mounting portion.
10. The wheel mechanism includes a support frame and wheels rotatably connected to both sides of the support frame, the first telescopic rod group includes an outer tube and an inner tube slidably disposed within the outer tube, the first lower base is fixed to the bottom of the outer tube, the top of the inner tube is fixed to the first upper base, a second connecting shaft is fixed to the bottom of the outer tube, and the support frame and the second connecting shaft are detachably connected, 3. The portable folding trailer according to claim 2, wherein a second annular groove is recessed into a lower portion of the second connecting shaft, an insertion hole is recessed into the support frame, a first through hole is provided in the support frame penetrating the insertion hole from inside to outside, the second connecting shaft is fitted into the insertion hole, the wheel mechanism further includes an L-shaped frame, a middle portion of the L-shaped frame is rotatably connected to a bottom portion of the support frame, an elastic body is provided between one end of the L-shaped frame and the support frame, a second insertion portion is fixed to the other end, and the second insertion portion enters the first through hole and is inserted into the second annular groove.