Folding structure of hand trailer

Abstract

The utility model discloses a folding structure of a hand trailer, which belongs to the field of hand trailers and comprises a folding assembly of the hand trailer, the inner side of the folding assembly of the hand trailer is connected with an expansion assembly, and the outer part of the folding assembly of the hand trailer is connected with a moving assembly; the extension assembly comprises two bearing plates, and damping knobs are rotatably connected to the front sides of the two bearing plates, and the technical scheme is characterized in that through the arrangement of the extension assembly, after the hand trailer is unfolded for use, if the hand trailer needs to bear an object with a larger bottom area, the damping knobs can be rotated, and the damping knobs can be rotated; a first screw rod and a second screw rod which are arranged in a reverse tooth mode are driven to synchronously rotate, so that a first sliding block and a second sliding block are driven to reciprocate front and back in the reverse direction, then expansion plates which are symmetrical front and back can be driven to reciprocate front and back in the reverse direction, the expansion plates extend out of a bearing plate, and therefore the bearing area of the hand trailer can be increased; and articles with different sizes can be conveniently carried and transported, and the use is more flexible and convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to hand trailer field, especially hand trailer folding structure. BACKGROUND

[0002] Hand trailer is a kind of small transport tool for short-distance carrying goods, usually by manpower or simple mechanical drive;

[0003] In the Chinese patent with application No. CN202121803176.2, a hand trailer is disclosed, which is provided with folding assemblies on both sides between a pair of side frames and folding parts on both sides of the load-bearing frame, so that the folding function of the hand trailer can be realized by folding the folding assemblies and the folding parts when the hand trailer is folded. The whole folding structure is simple, convenient and stable in use.

[0004] The existing hand trailers can be folded, but the usable area of the hand trailer is fixed after being unfolded, and it is difficult to expand the usable area, so it is not flexible and convenient to use. Therefore, we propose a hand trailer folding structure. INVENTION CONTENTS

[0005] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a hand trailer folding structure.

[0006] The above technical purpose of the utility model is realized by the following technical scheme:

[0007] A hand trailer folding structure, comprising a hand trailer folding assembly, an expansion assembly is connected to the inner side of the hand trailer folding assembly, and a moving assembly is connected to the outer side of the hand trailer folding assembly.

[0008] The expansion assembly comprises two load-bearing plates, a damping knob is rotatably connected to the front side of each load-bearing plate, the rear end of the damping knob is fixedly connected with a lead screw one, the rear end of the lead screw one is fixedly connected with a lead screw two, a sliding block one is movably connected to the outer side of the lead screw one, the sliding block one is matched with the lead screw one, a sliding block two is movably connected to the outer side of the lead screw two, the sliding block two is matched with the lead screw two, the outer end of the sliding block one and the sliding block two is fixedly connected with an expansion plate, the expansion plate is slidably installed in the inner side of the load-bearing plate, the expansion plate penetrates the load-bearing plate, the expansion plates are symmetrically distributed, and the lead screw one and the lead screw two are rotatably connected with the load-bearing plate.

[0009] By setting the expansion assembly, after the hand trailer is unfolded for use, if it is required to carry an object larger than the bottom area of the hand trailer, the damping knob can be rotated to drive the lead screws one and two provided with reverse teeth to rotate synchronously, thereby driving the sliding blocks one and two to reciprocate in the opposite direction, and further driving the front and rear symmetric expansion plates to reciprocate in the opposite direction, so that the expansion plates are extended from the load bearing plate, thereby increasing the load bearing area of the hand trailer, facilitating the carrying and transportation of objects of different sizes, and making the hand trailer more flexible and convenient to use.

[0010] Further, the load bearing plate is fixedly connected with a guide rod inside, and a pair of guide blocks are slidably connected to the guide rod, and the pair of guide blocks are fixedly connected with the sliding blocks one and two respectively.

[0011] By setting the guide rod and the guide blocks, the sliding blocks one and two can be guided to prevent the sliding blocks one and two from overturning.

[0012] Further, the hand trailer folding assembly comprises two bottom rods, the opposite end faces of the two bottom rods are fixedly connected with connecting plates, the outer part of the right connecting plate is rotatably connected with two folding rods one, the outer part of the left connecting plate is rotatably connected with two folding rods two, the folding rods one and two are rotatably connected through a rotating shaft, and the rotating shaft is rotatably connected with the folding rods one and two.

[0013] By setting the hand trailer folding assembly, when the device is stored and carried, the folding rods one and two can be folded to reduce the occupied space of the hand trailer, and the hand trailer is more convenient to store and carry.

[0014] Further, the outer part of the folding rod one is threadedly connected with a locking bolt, the outer part of the folding rod two is provided with a threaded hole, and the locking bolt is threadedly connected with the threaded hole.

[0015] Further, the left load bearing plate is fixedly connected with the folding rod two, the right load bearing plate is fixedly connected with the folding rod one, the lead screw one is rotatably connected with the front folding rods one and two respectively, the damping knob is rotatably connected to the front ends of the front folding rods one and two respectively, and the expansion plates penetrate through the folding rods one and two respectively.

[0016] Further, the moving assembly comprises a connecting frame, the lower end of the bottom rod is fixedly connected with the connecting frame, and the connecting frame is symmetrically distributed.

[0017] Further, the outer part of the connecting frame is rotatably connected with moving rollers, the moving rollers are symmetrically distributed, and the right end of the right bottom rod is fixedly connected with a handle.

[0018] In summary, the hand trailer has the following beneficial effects:

[0019] 1、By setting the expansion assembly, after the hand trailer is unfolded for use, if an object larger than the bottom area of the hand trailer is to be carried, the damping knob can be rotated to drive the screw rod one and the screw rod two provided with reverse teeth to rotate synchronously, thereby driving the sliding block one and the sliding block two to reciprocate in the opposite direction, and further driving the front and rear symmetrical expansion plates to reciprocate in the opposite direction, so that the expansion plates are extended from the load bearing plate, thereby increasing the load bearing area of the hand trailer, facilitating the carrying and transportation of objects of different sizes, and being more flexible and convenient to use.

[0020] 2、By setting the hand trailer folding assembly, when the device is stored and carried, the folding rod one and the folding rod two can be folded to reduce the occupied space of the hand trailer, and the device is more convenient to store and carry. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the overall structure schematic view in the embodiment;

[0022] Figure 2 is the structure schematic view of the load bearing plate and the expansion plate in the embodiment;

[0023] Figure 3 is the structure schematic view of the expansion assembly in the embodiment;

[0024] Figure 4 is the structure schematic view of the hand trailer folding assembly in the embodiment; Figure 3 is the structure schematic view of the A part in the embodiment;

[0025] Figure 5 is the structure schematic view of the B part in the embodiment. Figure 1

[0026] In the figure, 1, hand trailer folding assembly; 101, bottom rod; 102, connecting piece; 103, folding rod one; 104, folding rod two; 105, rotating shaft; 106, locking bolt; 107, screw hole; 2, expansion assembly; 201, load bearing plate; 202, damping knob; 203, screw rod one; 204, screw rod two; 205, sliding block one; 206, sliding block two; 207, expansion plate; 208, guide rod; 209, guide block; 3, moving assembly; 301, connecting frame; 302, moving roller; 303, handle. DETAILED DESCRIPTION

[0027] The utility model will be further explained in detail below in combination with the drawings.

[0028] Wherein, same parts are indicated by same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part. ​

[0029] Referring to Figures 1-4 As shown in the utility model more preferred embodiment of a hand trailer folding structure, including hand trailer folding assembly 1, the inner side of hand trailer folding assembly 1 is connected with expansion assembly 2, the outside of hand trailer folding assembly 1 is connected with moving assembly 3;

[0030] Expansion assembly 2 includes two bearing plates 201, the front side of two bearing plates 201 is rotatably connected with damping knob 202, the rear end of damping knob 202 is fixedly connected with lead screw one 203, the rear end of lead screw two 204 is fixedly connected with lead screw one 203, the outside of lead screw one 203 is movably connected with sliding block one 205, sliding block one 205 is matched with lead screw one 203, the outside of lead screw two 204 is movably connected with sliding block two 206, sliding block two 206 is matched with lead screw two 204, the outer end of sliding block one 205, sliding block two 206 is fixedly connected with expansion plate 207, expansion plate 207 is slidably installed in the inside of bearing plate 201, expansion plate 207 penetrates bearing plate 201, expansion plate 207 is symmetrically distributed, lead screw one 203, lead screw two 204 are rotatably connected with bearing plate 201.

[0031] Through the setting expansion assembly 2, after the hand trailer is unfolded and used, if the object to be carried is larger than the bottom area, damping knob 202 can be rotated, lead screw one 203 and lead screw two 204 provided with reverse teeth are driven to rotate synchronously, thereby sliding block one 205 and sliding block two 206 are driven to reciprocate in the opposite direction, and then expansion plate 207 symmetrically in front and back can be driven to reciprocate in the opposite direction, so that expansion plate 207 can be extended from bearing plate 201, thereby the loadable area of the hand trailer can be improved, the transportation of different size objects is facilitated, and the use is more flexible and convenient.

[0032] Referring to Figures 1-4 As shown in the utility model more preferred embodiment of a hand trailer folding structure, including hand trailer folding assembly 1, the inner side of hand trailer folding assembly 1 is connected with expansion assembly 2, the outside of hand trailer folding assembly 1 is connected with moving assembly 3;

[0033] Through the setting guide rod 208 and guide block 209, sliding block one 205 and sliding block two 206 can be guided, and sliding block one 205 and sliding block two 206 are prevented from overturning.

[0034] Referring to Figure 1 And Figure 5As shown in FIG. 1, the hand trailer folding assembly 1 comprises two bottom rods 101, the opposite end faces of the two bottom rods 101 are fixedly connected with connecting plates 102, the outer part of the right connecting plate 102 is rotatably connected with two folding rods one 103, the outer part of the left connecting plate 102 is rotatably connected with two folding rods two 104, the folding rods one 103 and the folding rods two 104 are rotatably connected through the pivot 105, and the pivot 105 is rotatably connected with the folding rods one 103 and the folding rods two 104.

[0035] By arranging the hand trailer folding assembly 1, when the device is stored and carried, the locking bolt 106 can be removed and separated from the screw hole 107, and then the folding rods one 103 and the folding rods two 104 are folded to reduce the occupied space of the hand trailer, which is more convenient for storage and carrying.

[0036] Referring to Figure 1 and Figure 5 As shown in FIG. 1, the outer part of the folding rods one 103 is threadedly connected with the locking bolt 106, the outer part of the folding rods two 104 is provided with the screw hole 107, and the locking bolt 106 is threadedly connected with the screw hole 107.

[0037] By arranging the locking bolt 106 and the screw hole 107, when the hand trailer is used, the included angle of the folding rods one 103 and the folding rods two 104 is adjusted, the folding rods one 103 and the folding rods two 104 are parallel, the locking bolt 106 is aligned with the screw hole 107, and then the locking bolt 106 is tightened with the screw hole 107, so that the folding rods one 103 and the folding rods two 104 are locked, which is convenient for bearing load.

[0038] Referring to Figures 1-5 As shown in FIG. 1, the left bearing plate 201 is fixedly connected with the folding rods two 104, the right bearing plate 201 is fixedly connected with the folding rods one 103, the lead screw one 203 is rotatably connected with the front folding rods one 103 and the folding rods two 104 respectively, the damping knob 202 is rotatably connected at the front end of the front folding rods one 103 and the folding rods two 104 respectively, and the expansion plate 207 penetrates the folding rods one 103 and the folding rods two 104 respectively.

[0039] Referring to Figure 1 As shown in FIG. 1, the moving assembly 3 comprises a connecting frame 301, the lower end of the bottom rod 101 is fixedly connected with the connecting frame 301, and the connecting frame 301 is symmetrically distributed.

[0040] Referring to Figure 1 As shown in FIG. 1, the outer part of the connecting frame 301 is rotatably connected with the moving rollers 302, the moving rollers 302 are symmetrically distributed, and the right end of the right bottom rod 101 is fixedly connected with the handle 303.

[0041] The handle 303 cooperates with the moving rollers 302, which can conveniently push and pull the hand trailer to move freely.

[0042] Specific implementation process: when using the hand cart, adjust the angle of the folding rod one 103 and the folding rod two 104, make the folding rod one 103 and the folding rod two 104 parallel, and make the locking bolt 106 and the screw hole 107 aligned, then tighten the locking bolt 106 and the screw hole 107, so as to lock the folding rod one 103 and the folding rod two 104, and facilitate the load bearing;

[0043] After the hand cart is unfolded, if the object to be carried is larger than the bottom area of the hand cart, the damping knob 202 can be rotated to drive the screw rod one 203 and the screw rod two 204 with reverse teeth to rotate synchronously, so as to drive the sliding block one 205 and the sliding block two 206 to reciprocate in the opposite direction, and then drive the front and rear symmetrical expansion plates 207 to reciprocate in the opposite direction, so that the expansion plates 207 can be extended from the load bearing plate 201, thereby increasing the load bearing area of the hand cart, facilitating the carrying and transportation of objects of different sizes, and being more flexible and convenient to use.

[0044] When the device is stored and carried, the locking bolt 106 is detached from the screw hole 107, and then the folding rod one 103 and the folding rod two 104 are folded to reduce the occupied space of the hand cart, so as to be more convenient to store and carry.

[0045] The basic principle and main features of the present application and the advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A folding structure for a hand trailer, characterised in that: The utility model provides a hand trailer folding assembly (1), the inner side of hand trailer folding assembly (1) is connected with expansion assembly (2), the outside of hand trailer folding assembly (1) is connected with mobile assembly (3); The expansion assembly (2) includes two load-bearing plates (201), the front side of two load-bearing plates (201) is rotatably connected with a damping knob (202), the rear end of the damping knob (202) is fixedly connected with a lead screw (203), the rear end of the lead screw (203) is fixedly connected with a lead screw (204), the outside of the lead screw (203) is movably connected with a sliding block (205), the sliding block (205) is matched with the lead screw (203), the outside of the lead screw (204) is movably connected with a sliding block (206), the sliding block (206) is matched with the lead screw (204), the outer end of the sliding block (205) and the sliding block (206) is fixedly connected with an expansion plate (207), the expansion plate (207) is slidably installed in the inside of the load-bearing plate (201), the expansion plate (207) penetrates the load-bearing plate (201), the expansion plate (207) is symmetrically distributed, the lead screw (203) and the lead screw (204) are rotatably connected with the load-bearing plate (201).

2. A folding structure for a hand trailer according to claim 1 wherein: The inside of the load-bearing plate (201) is fixedly connected with a guide rod (208), the outside of the guide rod (208) is slidably connected with a pair of guide blocks (209), the pair of guide blocks (209) are fixedly connected with the sliding block (205) and the sliding block (206) respectively.

3. The folding structure of claim 1, wherein: The hand trailer folding assembly (1) includes two bottom rods (101), the opposite end faces of two bottom rods (101) are fixedly connected with connecting plates (102), the outside of the connecting plate (102) on the right side is rotatably connected with two folding rods (103), the outside of the connecting plate (102) on the left side is rotatably connected with two folding rods (104), the folding rod (103) and the folding rod (104) are rotatably connected through a rotating shaft (105), the rotating shaft (105) is rotatably connected with the folding rod (103) and the folding rod (104).

4. A folding structure for a hand trailer according to claim 3 wherein: The outside of the folding rod (103) is threadedly connected with a locking bolt (106), the outside of the folding rod (104) is provided with a threaded hole (107), and the locking bolt (106) is threadedly connected with the threaded hole (107).

5. A folding structure for a hand trailer according to claim 3 wherein: The left load-bearing plate (201) is fixedly connected with the folding rod (104), the right load-bearing plate (201) is fixedly connected with the folding rod (103), the lead screw (203) is rotatably connected with the folding rod (103) and the folding rod (104) on the front side respectively, the damping knob (202) is rotatably connected with the front end of the folding rod (103) and the folding rod (104) on the front side respectively, and the expansion plate (207) penetrates the folding rod (103) and the folding rod (104) respectively.

6. The folding structure of claim 1, wherein: The mobile assembly (3) comprises a connecting frame (301), the lower end of the bottom rod (101) is fixedly connected with the connecting frame (301), and the connecting frame (301) is symmetrically distributed.

7. A folding structure for a hand trailer according to claim 6 wherein: The outer part of the connecting frame (301) is rotatably connected with a mobile roller (302), the mobile roller (302) is symmetrically distributed, and the right end of the right side of the bottom rod (101) is fixedly connected with a handle (303).

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