Hand trailer with multi-piston structure

Abstract

The utility model discloses a hand trailer with a multi-piston structure, which comprises a fence assembly, a bottom fork assembly, a wheel fixing and dismounting assembly and a pull rod assembly, the fence assembly is a regular four-side connecting structure, and the fence assembly takes a first piston structure and a second piston structure as connecting nodes; the first piston structure and the second piston structure are arranged in parallel, the top of the first piston structure and the bottom of the second piston structure are riveted through a first inclined rod, and the bottom of the first piston structure and the top of the second piston structure are riveted through a second inclined rod. According to the novel wheel installation structure, the load bearing performance of the product is obviously improved, and the folding and boxing size is obviously increased, a piston telescopic structure is adopted to be connected with an inclined rod to form an expandable and foldable subunit, and a plurality of subunits are connected pairwise to form an integrally-linked, expandable and foldable enclosure structure.

Description

Technical Field

[0001] The utility model relates to the field of folding structures, in particular to a hand trailer with a multi-piston structure. Background Art

[0002] A hand trolley is a small cart that is mainly used to transport goods or items. It is usually pushed or pulled by one person and is widely used in homes, warehouses, supermarkets, logistics centers and other occasions.

[0003] Application number: CN202321630373.8, discloses an electric four-wheeled handcart with fences, which has a simple structure and reasonable design. Two rotating plates are hinged on both sides of the bottom plate on which the third and fourth fences are installed. The other ends of the two rotating plates on the same side are hinged on the first and second fences respectively. Therefore, the rotating plates can rotate about the hinges with the bottom plate, and the first and second fences can also rotate about the hinges with the rotating plates. The first and second fences are both provided with limiting slots, and the third and fourth fences are provided with limiting strips that adapt to the limiting slots. The third and fourth fences can be installed by simply inserting the limiting strips into the limiting slots. After the third and fourth fences are removed, the first and second fences can be folded up to save space. At the same time, by removing only one of the third or fourth fences and covering the removed fence on the top of the other three fences, a new flat surface can be formed for placing items, providing more diverse functions.

[0004] However, when the fence of the hand trolley in the above-mentioned prior art is folded, a part of the fence needs to be disassembled before it can be folded. The overall linkage of the fence is poor and the flexibility of use needs to be improved. For this reason, we propose a multi-piston structure hand trolley. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the purpose of the present invention is to provide a multi-piston structure hand trailer, which adopts a new folding structure, a new bottom bracket structure, and a new wheel mounting structure. The product's load-bearing capacity and folding and packing volume are significantly improved. The present invention adopts a piston telescopic structure to connect the diagonal rod to form an expandable and foldable sub-unit, and multiple sub-units are connected in pairs to form an overall linkage, expandable and foldable enclosure structure.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A multi-piston structure hand trailer includes an enclosure assembly, a bottom fork assembly, a wheel fixing and disassembly assembly and a pull rod assembly. The enclosure assembly is a regular four-sided connection structure. The enclosure assembly is composed of a first piston structure and a second piston structure as connection nodes. The first piston structure and the second piston structure are placed in parallel. The top of the first piston structure and the bottom of the second piston structure are riveted with a first diagonal rod, and the bottom of the first piston structure and the top of the second piston structure are riveted with a second diagonal rod. The first diagonal rod and the second diagonal rod are staggered and riveted through their respective center holes to form a piston structure subunit. The side wall of the enclosure assembly is composed of no less than two piston structure subunits, and two adjacent piston structure subunits share a piston rod to achieve linkage. The front and rear walls of the enclosure assembly are composed of no less than one piston structure subunit, and the front and rear walls and side walls of the enclosure assembly share a piston rod to achieve linkage.

[0008] Furthermore, the bottom fork assembly includes a first-layer bottom support structure and a second-layer automatic folding bottom support structure, the first-layer bottom support structure includes four first-layer bottom fork support rods, one end of the first-layer bottom fork support rod is welded with a first-layer bottom fork connecting iron fitting, the first-layer bottom fork support rod is connected to the bottom of the four corners of the enclosure assembly through the first-layer bottom fork connecting iron fitting, the other ends of the four first-layer bottom fork support rods are opened and cylindrical pins are placed through them, the cylindrical pins are snapped into the slots of the middle connecting piece, so that the four first-layer bottom fork support rods can rotate upward under the pull of the middle connecting piece, and are prevented from further downward movement when laid flat to the horizontal plane, thereby achieving support and load-bearing.

[0009] Furthermore, a cover plate is provided on the central connecting member, and the cover plate is connected to the central connecting member by self-tapping screws to prevent the support rod from being separated from the central connecting member after folding.

[0010] Furthermore, the second-layer automatic folding bottom support structure includes two second-layer bottom fork support rods, one end of the second-layer bottom fork support rod is welded with a second-layer bottom fork connecting iron fitting, the second-layer bottom fork support rod is connected to the bottom of the middle piston structure of the side wall through the second-layer bottom fork connecting iron fitting, the other end of the two second-layer bottom fork support rods is welded with a second-layer bottom fork rotating iron fitting, a folding torsion spring is placed between the two second-layer bottom fork rotating iron fittings, and the two second-layer bottom fork rotating iron fittings are riveted together with the folding torsion spring.

[0011] Furthermore, when the two second-layer bottom fork support rods move downward to be on the same line, the tops of the two second-layer bottom fork rotating iron fittings just touch, preventing the second-layer bottom fork support rods from continuing to move downward, thereby achieving support and load-bearing.

[0012] Furthermore, the wheel fixing and disassembly assembly consists of an inner sleeve that is inserted into the lower fixing rod of the piston structure at the four corners of the enclosure assembly and fixed thereto, an outer fixing sleeve is inserted into the outside of the lower fixing rod of the piston structure, and the lower fixing rod of the piston structure and the outer fixing sleeve are riveted through the upper opening, a square motion groove is provided on the outer fixing sleeve, a fixing button is embedded in the square motion groove, a cavity is provided in the middle of the fixing button, and a reset spring is placed inside the cavity.

[0013] Furthermore, the fixing button after placing the reset spring is inserted into the motion groove of the outer fixing sleeve and riveted together in an upper and lower connection manner with rivets, so that the fixing button can perform reciprocating motion within a certain range.

[0014] Furthermore, the tie rod assembly includes a main tie rod and two auxiliary tie rods, one end of the two auxiliary tie rods is movably connected to the main tie rod, and the other ends of the two auxiliary tie rods are movably connected to the lower fixed rod of the piston structure on the left side wall of the enclosure assembly.

[0015] In summary, the present invention has the following beneficial effects:

[0016] 1. This utility model adopts a new folding structure, a new bottom bracket structure, and a new wheel mounting structure, which significantly improves the product's load-bearing capacity and folded packaging volume. This utility model uses a piston telescopic structure to connect the diagonal rod to form an expandable and foldable sub-unit. Multiple sub-units are connected in pairs to form an integral linkage, expandable and foldable enclosure structure;

[0017] 2. The bottom of the enclosure structure innovatively uses two layers of independently connected but simultaneously stress-bearing bottom support structure, which greatly improves the product's load-bearing capacity and durability.

[0018] 3. The four corners and bottoms of the overall structure are equipped with fixed and detachable wheels, which can be easily disassembled and cleaned by consumers, and can also significantly reduce the packing size for easy transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the overall assembly structure in this embodiment;

[0020] Figure 2 Schematic diagram of the structure of the enclosure assembly in this embodiment;

[0021] Figure 3 Schematic diagram of the structure of the piston structure subunit in this embodiment;

[0022] Figure 4 Schematic diagram of the structure of the first bottom support structure in this embodiment;

[0023] Figure 5Schematic diagram of the structure of the second layer of automatic folding bottom support structure in this embodiment;

[0024] Figure 6 It is a schematic structural diagram of the explosion of the wheel fixing and disassembly assembly in this embodiment.

[0025] In the figure, 1. enclosure assembly; 101. first piston structure; 102. second piston structure; 103. first diagonal rod; 104. second diagonal rod; 2. bottom fork assembly; 201. first layer bottom support structure; 2011. first layer bottom fork support rod; 2012. first layer bottom fork connecting iron fitting; 2013. center connector; 2014. cover plate; 202. second layer automatic folding bottom support structure; 2021. second layer bottom fork support rod; 2022. second layer bottom fork connecting iron fitting; 2023. second layer bottom fork rotating iron fitting; 2024. folding torsion spring; 3. wheel fixing and disassembly assembly; 301. inner sleeve; 302. piston structure lower fixing rod; 303. outer fixing sleeve; 304. fixing button; 305. reset spring; 4. pull rod assembly; 401. main pull rod; 402. auxiliary pull rod. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below with reference to the accompanying drawings.

[0027] Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom," "top," "inner," and "outer" refer to directions toward or away from the geometric center of a particular component, respectively.

[0028] Reference Figure 1-Figure 3 As shown, a multi-piston structure hand trailer in a preferred embodiment of the present invention includes a fence assembly 1, a bottom fork assembly 2, a wheel fixing and disassembly assembly 3 and a pull rod assembly 4. The fence assembly 1 is a regular four-sided connection structure. The fence assembly 1 is connected by a first piston structure 101 and a second piston structure 102. The first piston structure 101 and the second piston structure 102 are placed in parallel. The top of the first piston structure 101 and the bottom of the second piston structure 102 are riveted with a first oblique rod 103. The first piston structure 1 The bottom of 01 and the top of the second piston structure 102 are riveted with a second oblique rod 104, and the first oblique rod 103 and the second oblique rod 104 are staggered and riveted through their respective center holes, thereby forming a piston structure sub-unit. The side wall of the enclosure assembly 1 is composed of no less than two piston structure sub-units, and two adjacent piston structure sub-units share a piston rod to achieve linkage. The front and rear walls of the enclosure assembly 1 are composed of no less than one piston structure sub-unit, and the front and rear walls and side walls of the enclosure assembly 1 share a piston rod to achieve linkage.

[0029] Reference Figure 1 and Figure 4 As shown, the bottom fork assembly 2 includes a first-layer bottom support structure 201 and a second-layer automatic folding bottom support structure 202. The first-layer bottom support structure 201 includes four first-layer bottom fork support rods 2011. One end of the first-layer bottom fork support rod 2011 is welded with a first-layer bottom fork connecting iron fitting 2012. The first-layer bottom fork support rod 2011 is connected to the bottom of the four corners of the enclosure assembly 1 through the first-layer bottom fork connecting iron fitting 2012. The other ends of the four first-layer bottom fork support rods 2011 are opened and cylindrical pins are placed through them. The cylindrical pins are inserted into the slots of the middle connecting piece 2013, so that the four first-layer bottom fork support rods 2011 can rotate upward under the pull of the middle connecting piece 2013, and prevent further downward movement when they are laid flat on the horizontal plane, thereby achieving support and load-bearing.

[0030] Reference Figure 1 and Figure 4 As shown, a cover plate 2014 is provided on the middle connecting member 2013, and the cover plate 2014 is connected to the middle connecting member 2013 by self-tapping screws to prevent the support rod from being separated from the middle connecting member 2013 after folding.

[0031] Reference Figure 1 and Figure 5 As shown, the second-layer automatic folding bottom support structure 202 includes two second-layer bottom fork support rods 2021, and a second-layer bottom fork connecting iron fitting 2022 is welded to one end of the second-layer bottom fork support rod 2021. The second-layer bottom fork support rod 2021 is connected to the bottom of the middle piston structure of the side wall through the second-layer bottom fork connecting iron fitting 2022. The other end of the two second-layer bottom fork support rods 2021 is welded to a second-layer bottom fork rotating iron fitting 2023. A folding torsion spring 2024 is placed between the two second-layer bottom fork rotating iron fittings 2023, and the two second-layer bottom fork rotating iron fittings 2023 are riveted together with the folding torsion spring 2024.

[0032] Reference Figure 1 and Figure 5 As shown, when the two second-layer bottom fork support rods 2021 move downward to be on the same line, the tops of the two second-layer bottom fork rotating irons 2023 just touch each other, preventing the second-layer bottom fork support rods 2021 from continuing to move downward, thereby achieving support and load-bearing.

[0033] When the first-layer bottom support structure 201 is unfolded and in a horizontal state, it is in contact with the second-layer automatic folding bottom support structure 202 to achieve common support and load-bearing. When the first-layer bottom support structure 201 is folded upward, the folding torsion spring 2024 of the second-layer automatic folding bottom support structure 202 causes it to produce a certain upward deflection, thereby achieving that although the two sets of bottom support structures are not linked, they can both be effectively folded.

[0034] Reference Figure 1 and Figure 6 As shown, the wheel fixing and disassembly assembly 3 consists of an inner sleeve 301 which is inserted into the lower fixing rod 302 of the piston structure at the four corners of the enclosure assembly 1 and fixed thereto, the outer portion of the lower fixing rod 302 of the piston structure is inserted into an outer fixing sleeve 303 and the lower fixing rod 302 of the piston structure and the outer fixing sleeve 303 are riveted through the opening at the upper portion, a square motion groove is provided on the outer fixing sleeve 303, a fixing button 304 is embedded in the square motion groove, a cavity is provided in the middle of the fixing button 304, and a return spring 305 is placed inside the cavity.

[0035] Reference Figure 1 and Figure 6 As shown, the fixing button 304 after placing the reset spring 305 is inserted into the motion groove of the outer fixing sleeve 303 and riveted together by rivets in an upper and lower connection manner, so that the fixing button 304 can reciprocate within a certain range.

[0036] The reciprocating motion ensures that the front end of the fixing button 304 can both extend into the inner sleeve 301 and withdraw from the inner sleeve 301, thereby being able to clamp the wheel axle in the inner sleeve 301 to lock the wheel axle (i.e., fix the wheel), and also be able to break away from the contact with the wheel axle to unlock the wheel axle (i.e., remove the wheel).

[0037] Reference Figure 1 As shown, the tie rod assembly 4 includes a main tie rod 401 and two auxiliary tie rods 402. One end of the two auxiliary tie rods 402 is movably connected to the main tie rod 401, and the other end of the two auxiliary tie rods 402 is movably connected to the lower fixed rod 302 of the piston structure on the left side wall of the enclosure assembly 1.

[0038] Specific implementation process: The pull rod assembly 4 can be used to push and pull the hand trailer to move, and the push and pull of the enclosure assembly 1 can allow each piston structure subunit to be extended or folded, thereby adjusting the volume of the hand trailer. When the first layer of the bottom support structure 201 is unfolded and in a horizontal state, it just contacts the second layer of the automatic folding bottom support structure 202 to achieve common support and load-bearing. When the first layer of the bottom support structure 201 is folded upward, the folding torsion spring 2024 of the second layer of the automatic folding bottom support structure 202 causes it to produce a certain upward deflection, thereby achieving that although the two sets of bottom support structures are not linked, they can also be effectively folded;

[0039] In addition, after the reset spring 305 is placed, the fixing button 304 is inserted into the motion groove of the outer fixing sleeve 303 and riveted together with rivets in an upper and lower connection manner, so that the fixing button 304 can reciprocate within a certain range. The reciprocating motion stroke ensures that the front end of the fixing button 304 can both extend into the inner sleeve 301 and withdraw from the inner sleeve 301, thereby achieving the ability to clamp the wheel axle in the inner sleeve 301 to lock the wheel axle (i.e., fix the wheel), and also to break away from the contact with the wheel axle to unlock the wheel axle (i.e., remove the wheel).

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A multi-piston structure hand trailer, characterized by: The invention comprises a barrier assembly (1), a bottom fork assembly (2), a wheel fixing and disassembly assembly (3) and a pull rod assembly (4); the barrier assembly (1) is a regular four-sided connection structure; the barrier assembly (1) is connected by a first piston structure (101) and a second piston structure (102); the first piston structure (101) and the second piston structure (102) are placed in parallel; the top of the first piston structure (101) and the bottom of the second piston structure (102) are riveted by a first oblique rod (103); the bottom of the first piston structure (101) The top of the second piston structure (102) is riveted with a second oblique rod (104), and the first oblique rod (103) and the second oblique rod (104) are staggered and riveted through their respective center holes, thereby forming a piston structure subunit. The side wall of the enclosure assembly (1) is composed of no less than two piston structure subunits, and two adjacent piston structure subunits share a piston rod to achieve linkage. The front and rear walls of the enclosure assembly (1) are composed of no less than one piston structure subunit, and the front and rear walls and side walls of the enclosure assembly (1) share a piston rod to achieve linkage.

2. The multi-piston structure hand trailer according to claim 1, characterized in that: The bottom fork assembly (2) comprises a first-layer bottom support structure (201) and a second-layer automatically foldable bottom support structure (202), wherein the first-layer bottom support structure (201) comprises four first-layer bottom fork support rods (2011), one end of each of the first-layer bottom fork support rods (2011) is welded with a first-layer bottom fork connecting iron fitting (2012), and the first-layer bottom fork support rods (2011) are connected to the bottom of the four corners of the enclosure assembly (1) through the first-layer bottom fork connecting iron fitting (2012), and the other ends of the four first-layer bottom fork support rods (2011) are opened with a cylindrical pin placed through them, and the cylindrical pin is inserted into the slot of the middle connecting piece (2013), so that the four first-layer bottom fork support rods (2011) can rotate upward when pulled by the middle connecting piece (2013), and prevent further downward movement when they are flattened to a horizontal plane, thereby achieving support and load-bearing.

3. The multi-piston structure hand trailer according to claim 2, characterized in that: A cover plate (2014) is provided on the central connecting piece (2013), and the cover plate (2014) and the central connecting piece (2013) are connected via self-tapping screws to prevent the support rod from being separated from the central connecting piece (2013) after folding.

4. The multi-piston structure hand trailer according to claim 3, characterized in that: The second-layer automatic folding bottom support structure (202) comprises two second-layer bottom fork support rods (2021), one end of each of the second-layer bottom fork support rods (2021) is welded with a second-layer bottom fork connecting iron fitting (2022), the second-layer bottom fork support rods (2021) are connected to the bottom of the side wall middle piston structure via the second-layer bottom fork connecting iron fitting (2022), the other ends of the two second-layer bottom fork support rods (2021) are welded with a second-layer bottom fork rotating iron fitting (2023), a folding torsion spring (2024) is placed between the two second-layer bottom fork rotating iron fittings (2023), and the two second-layer bottom fork rotating iron fittings (2023) are riveted together with the folding torsion spring (2024).

5. The multi-piston structure hand trailer according to claim 4, characterized in that: When the two second-layer bottom fork support rods (2021) move downwards to be on the same line, the tops of the two second-layer bottom fork rotating iron parts (2023) just touch each other, preventing the second-layer bottom fork support rods (2021) from continuing to move downwards, thereby achieving support and load-bearing.

6. The multi-piston structure hand trailer according to claim 1, characterized in that: The wheel fixing and disassembling assembly (3) is inserted into the piston structure lower fixing rod (302) at the four corners of the enclosure assembly (1) by an inner sleeve (301) and fixed thereto, the outer portion of the piston structure lower fixing rod (302) is inserted into an outer fixing sleeve (303), and the piston structure lower fixing rod (302) and the outer fixing sleeve (303) are riveted through the upper opening, the outer fixing sleeve (303) is provided with a square motion groove, a fixing button (304) is embedded in the square motion groove, a cavity is provided in the middle of the fixing button (304), and a reset spring (305) is placed inside the cavity.

7. The multi-piston structure hand trailer according to claim 6, characterized in that: The fixing button (304) after placing the reset spring (305) is inserted into the motion groove of the outer fixing sleeve (303) and riveted by rivets in an upper and lower connection mode, so that the fixing button (304) performs reciprocating motion.

8. The multi-piston structure hand trailer according to claim 1, characterized in that: The pull rod assembly (4) includes a main pull rod (401) and two auxiliary pull rods (402), one end of each of the two auxiliary pull rods (402) is movably connected to the main pull rod (401), and the other end of each of the two auxiliary pull rods (402) is movably connected to the lower fixed rod (302) of the piston structure on the left side wall of the enclosure assembly (1).

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