Frame of folding trailer

Abstract

The utility model discloses a frame of a folding trailer, and the frame comprises a main body frame which comprises two frames with the same structure, namely a first frame and a second frame, and the first frame and the second frame are hinged to each other and can be folded relative to each other; the side frames are symmetrically arranged on the two sides of the main body frame; the number of the linkage rods is at least two, the linkage rods are arranged below the first frame and the second frame at intervals, the inner ends of the two linkage rods are hinged to each other, the outer ends of the two linkage rods are hinged to the two symmetrical side frames respectively, and one position of each linkage rod is detachably connected with a sliding part; the at least two connecting plates are used for connecting the first frame with the linkage rod and connecting the second frame with the linkage rod, one end of each connecting plate is detachably connected to the linkage rod, an arc groove is formed in each connecting plate, and the sliding part slides in the arc groove and is used for synchronizing movement between the main body frame and the linkage rod; through linkage of the main body frame and the linkage rod, the frame can be switched between the unfolded state and the folded state.

Description

Technical Field

[0001] The present application relates to the field of trailers, and in particular to a frame of a folding trailer. Background Art

[0002] In daily life and production, we often need to carry luggage or items, and trailers are often used in the process of transportation. Trailers are widely used in carrying things because they are easy to push and save time and effort.

[0003] Based on this, a folding trailer proposed in announcement number CN212401255U has a flat and compact frame structure after folding, which brings convenience to users' daily carrying and storage. However, the movement range of such a structure is not fixed when folding, which may cause it to be unable to be completely folded into place. In addition, the general folding trailer chassis is a single-layer structure, and there are also double-layer structures, but there are few limited connections between the double-layer structures. Therefore, its support strength after unfolding needs to be improved.

[0004] The above contents are only used to assist in understanding the technical solution of the present application, and do not constitute an admission that the above contents are the closest prior art to the present application. Summary of the invention

[0005] Based on this, the present application provides a frame of a folding trailer to solve one of the above-mentioned technical problems.

[0006] The technical solution adopted by the present application to solve its technical problems is, comprising: a main frame, comprising two frames of the same structure, divided into a first frame and a second frame, which are hinged to each other and can be folded relative to each other; side frames, symmetrically arranged on both sides of the main frame; at least two linkage rods are arranged at intervals below the first frame and the second frame, the inner ends of the two linkage rods are hinged to each other, and the outer ends are respectively hinged to two symmetrical side frames, and one part of the linkage rod is detachably connected with a sliding part; connecting plates, at least two places are arranged, for connecting the first frame and the linkage rod, and the second frame and the linkage rod, one end of the connecting plate is detachably connected to the linkage rod, and a circular arc groove is opened on it, and the sliding part slides in the circular arc groove for synchronizing the movement between the main frame and the linkage rod; through the linkage between the main frame and the linkage rod, the frame can switch between the unfolded state and the folded state.

[0007] In some embodiments, the first frame includes at least two main rods, one end of which is hinged to the main rod of the second frame through a connecting piece, a plurality of first support rods are fixedly arranged between the two main rods, second support rods are arranged between the first support rods, and one end of the connecting plate is detachably connected to the second support rods.

[0008] In some embodiments, the sliding part includes an upper guide block and a lower guide block, the lower guide block is a cylinder, the upper guide block is a second-order cylinder, the end of the upper guide block with a smaller radius cooperates with the upper guide block and is connected to the connecting plate and the linkage rod by screws and nuts.

[0009] In some embodiments, a sub-plate is detachably connected to the connecting plate, and one side of the sub-plate cooperates with the outer periphery of the maximum radius of the upper guide block.

[0010] In some embodiments, protrusions are formed on the sub-plate to cooperate with the sliding portion when the sliding portion is located at two ends of the arc groove.

[0011] In some embodiments, a plurality of first positioning holes are provided on the surface of the connecting plate for matching with a protruding column formed at one end of the sub-plate.

[0012] In some embodiments, at least two second positioning holes are provided on the surface of the connecting plate to cooperate with the linkage rod.

[0013] The beneficial effects of the present application are: a connecting plate is provided, and the movement stroke between the main frame and the linkage rod is limited by the connecting plate, and the connecting plate enables the main frame and the linkage rod to move synchronously, which helps to assist in improving the convenience of the folding operation. At the same time, due to the existence of the connecting plate, the main frame and the linkage rod are effectively supported when unfolded, thereby improving the overall strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a three-dimensional schematic diagram of this application.

[0016] Figure 2 It is a schematic diagram of the connection board of this application.

[0017] Figure 3 It is a schematic side view of the connection plate installation of the present application.

[0018] Figure 4 It is a three-dimensional schematic diagram of the connection plate installation of the present application.

[0019] Explanation of the accompanying drawings: 1. Main frame; 11. First frame; 111. First support rod; 112. Second support rod; 113. Main rod; 12. Second frame; 2. Side frame; 3. Linkage rod; 4. Sliding part; 41. Upper guide block; 42. Lower guide block; 43. Screw; 44. Nut; 5. Connecting plate; 51. Arc groove; 52. Sub-plate; 53. First positioning hole; 54. Second positioning hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection of this application.

[0021] In the embodiments of this application, please refer to Figure 1-4 As shown, the present application provides a frame of a folding trailer, which mainly includes: a main frame 1, including two frames of the same structure, divided into a first frame 11 and a second frame 12, which are hinged to each other and can be folded relative to each other; side frames 2, symmetrically arranged on both sides of the main frame 1; at least two linkage rods 3 are provided, which are arranged below the first frame 11 and the second frame 12 at an interval, the inner ends of the two linkage rods 3 are hinged to each other, and the outer ends are respectively hinged to the two symmetrical side frames 2, and one part of the linkage rod 3 is detachably connected with a sliding part 4; a connecting plate 5 is provided at least at two places, for connecting the first frame 11 and the linkage rod 3, and the second frame 12 and the linkage rod 3, one end of the connecting plate 5 is detachably connected to the linkage rod 3, and a circular arc groove 51 is opened on it, and the sliding part 4 slides in the circular arc groove 51, and is used to synchronize the movement between the main rod 113 and the linkage rod 3; through the linkage between the main frame 1 and the linkage rod 3, the frame can switch between the unfolded state and the folded state.

[0022] Specifically, when the frame needs to switch to the unfolded state or the folded state, the main frame 1 rotates through the connecting plate 5 to drive the linkage rod 3 to move together, and at the same time the slider slides in the arc groove 51 until the sliding part 4 reaches one end of the arc groove 51 and cannot move further, thereby completing the switching between the unfolded state and the folded state efficiently and accurately.

[0023] Some preferred / improved embodiments based on the above embodiments will be described below. Any one of the following embodiments may be selected, or multiple embodiments may be selected and combined.

[0024] Reference Figure 1 As shown, in order to allow the first frame 11 and the second frame 12 to be folded normally, the first frame 11 includes at least two main rods 113, one end of which is hinged to the main rod 113 of the second frame 12 through a connecting piece, a plurality of first support rods 111 are fixedly arranged between the two main rods 113, second support rods 112 are arranged between the first support rods 111, and one end of the connecting plate 5 is detachably connected to the second support rod 112.

[0025] Reference Figure 3 As shown, the sliding part 4 includes an upper guide block 41 and a lower guide block 42, the lower guide block 42 is a cylinder, and the upper guide block 41 is a second-order cylinder. The end of the upper guide block 41 with a smaller radius cooperates with the upper guide block 41 and is connected to the connecting plate 5 and the linkage rod 3 by screws 43 and nuts 44. This arrangement makes the sliding part 4 more stable and easy to install.

[0026] Furthermore, in order to enable the sliding portion 4 to slide smoothly in the arc groove 51 , the step height of the upper guide block 41 and the lower guide block 42 is greater than the thickness of the connecting plate 5 .

[0027] Reference Figure 2 As shown, a sub-plate 52 is detachably connected to the connecting plate 5 , and one side of the sub-plate 52 cooperates with the outer periphery of the maximum radius of the upper guide block 41 .

[0028] Specifically, protrusions are formed on the sub-plate 52 to cooperate with the sliding portion when it is located at both ends of the arc groove 51. This arrangement can fix the frame in a folded state or an unfolded state to prevent the frame from being unstable due to some external forces.

[0029] Preferably, a plurality of first positioning holes 53 are provided on the surface of the connecting plate 5 for cooperating with the protruding column formed at one end of the sub-plate 52. Such a configuration can make the connection between the sub-plate 52 and the connecting plate 5 more stable. Specifically, two positioning holes are used in this example.

[0030] Preferably, in order to facilitate the installation of the connecting plate 5 , at least two second positioning holes 54 are provided on the surface of the connecting plate 5 to cooperate with the linkage rod 3 .

[0031] So far, various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present application, and the aforementioned embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A frame of a folding trailer, characterized in that: include: The main frame includes two frames of the same structure, namely a first frame and a second frame, which are hinged to each other and can be folded relative to each other; Side frames are symmetrically arranged on both sides of the main frame; At least two linkage rods are provided, which are spaced apart and arranged below the first frame and the second frame, the inner ends of the two linkage rods are hinged to each other, and the outer ends are respectively hinged to two symmetrical side frames, and a sliding portion is provided at one part of the linkage rod; A connecting plate, provided at least at two locations, for connecting the first frame and the linkage rod, and the second frame and the linkage rod, one end of the connecting plate is detachably connected to the linkage rod, and a circular arc groove is provided on the connecting plate, and the sliding part slides in the circular arc groove to synchronize the movement between the main frame and the linkage rod; Through the linkage between the main frame and the linkage rod, the frame can be switched between the unfolded state and the folded state.

2. A folding trailer frame according to claim 1, characterized in that: The first frame includes at least two main rods, one end of which is hinged to the main rod of the second frame through a connecting piece, a plurality of first support rods are fixedly arranged between the two main rods, a second support rod is arranged between the first support rods, and one end of the connecting plate is detachably connected to the second support rod.

3. A folding trailer frame according to claim 2, characterized in that: The sliding part includes an upper guide block and a lower guide block, the lower guide block is a cylinder, and the upper guide block is a second-order cylinder. The end of the upper guide block with a smaller radius cooperates with the upper guide block and is connected to the connecting plate and the linkage rod by screws and nuts.

4. A folding trailer frame according to claim 3, characterized in that: The connecting plate is detachably connected with a sub-plate, and one side of the sub-plate is matched with the outer periphery of the maximum radius of the upper guide block.

5. A folding trailer frame according to claim 4, characterized in that: The auxiliary plate is formed with protrusions that cooperate with the sliding portion when the sliding portion is located at both ends of the circular arc groove.

6. A folding trailer frame according to claim 5, characterized in that: A plurality of first positioning holes are arranged on the surface of the connecting plate, which are used to match the convex column formed at one end of the auxiliary plate.

7. The frame of a folding trailer according to claim 1, characterized in that: At least two second positioning holes are arranged on the surface of the connecting plate to cooperate with the linkage rod.

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