Four-wheel trolley

Abstract

The utility model belongs to the technical field of trolleys, and particularly relates to a four-wheel trolley which comprises a main cross rod, side rods are rotationally connected to the two ends of the main cross rod, the maximum rotation angle of each side rod is 90 degrees, the section of each side rod is in a U shape, and each side rod is provided with a containing groove for containing the main cross rod. Universal wheels are rotationally connected to the two ends of the bottom face of each side rod, and an insertion cross rod is inserted between the two side rods and inserted into the storage groove. When the side rods are closed, the main cross rods are surrounded by the storage grooves, and a rod type form is formed. The occupied space of the rod type form is smaller, and in the rod type form, the universal wheels are located below the side rods, and the four universal wheels are distributed side by side. Wheel collecting grooves for containing the universal wheels are formed in the sides, close to the main transverse rod, of the inserting transverse rods, and the universal wheels can be directly contained in the wheel collecting grooves. The whole vehicle body frame forms a rod type structure, and the wheel bodies cannot be in contact with the vehicle body, so that the vehicle body and environmental sanitation are protected.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the trolley technical field, concretely relates to a four-wheel dolly. BACKGROUND

[0002] The current small trolley is mainly composed of a bearing surface and four wheels, in order to facilitate storage, the bearing surface of the small trolley can be folded. In order to facilitate work, it is very common to carry a folding trolley in the vehicle, but the folding trolley carried in the vehicle has the following defects:

[0003] After the plate body is folded, in order to avoid the interference of the wheels on the thickness of the plate body folding, therefore the wheels are located on the outside after the plate body is folded. In order to facilitate work, portable trolleys are carried in the vehicle. The wheels of the portable trolley will adhere to the soil when working outdoors, and the soil will pollute the indoor environment. INNOVATION CONTENT

[0004] The utility model provides a four-wheel dolly, has the characteristics of small storage volume and mutual surrounding protection to the wheel.

[0005] The utility model provides the following technical scheme: including main cross rod, both ends of main cross rod are rotatably connected with side rod, the maximum angle of rotation of side rod is 90 degrees, the section of side rod is "Fang" character shape, side rod has the storage groove of storage main cross rod;

[0006] The bottom surface of the side rod is rotatably connected with a universal wheel at both ends, a plug-in cross rod is inserted between the two side rods, the plug-in cross rod is inserted in the storage groove, a wheel storage groove for storing the universal wheel is formed in the side of the plug-in cross rod close to the main cross rod, and the main cross rod and the plug-in cross rod are fixedly connected through the connecting plate.

[0007] Among them, the length of the side rod is less than half the length of the main cross rod.

[0008] Among them, the cross-sectional shape of the main cross rod is "Fang" character shape, a rotating column is fixedly connected at the center of the groove body of the main cross rod, and the connecting plate is rotatably connected with the rotating column.

[0009] Among them, the middle part of the wheel storage groove is fixedly connected with a buckling pin, an arc-shaped clamping groove is formed in the end of the connecting plate away from the rotating column, a stepped groove is formed in the top of the buckling pin, and the arc-shaped clamping groove and the stepped groove are slidably connected.

[0010] Among them, the upper and lower end faces of the side rod are provided with stamping concave points, the stamping concave points form protrusions on the inner wall of the storage groove, and the plug-in cross rod is in contact with the protrusions.

[0011] The utility model has the advantages of:

[0012] In the side rod closing stage, the receiving groove surrounds the main cross rod, forming a rod type form. The rod type form occupies less space, and in the rod type form, the universal wheels are located below the side rods, and the four universal wheels are distributed side by side. The plug-in cross rod is provided with a wheel receiving groove for receiving the universal wheel on the side close to the main cross rod, and the wheel receiving groove can directly receive the universal wheel. The entire vehicle body frame forms a rod type structure, and the wheel body cannot contact the vehicle body, thereby protecting the vehicle body and the environment, and the closed environment also effectively protects the wheel body, and the rod type form is also very convenient in the case of handheld carrying.

[0013] The parts not involved in the device are the same as or can be implemented by the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a three-dimensional view of the folded utility model;

[0015] Figure 2 It is a three-dimensional view of the unfolded utility model;

[0016] Figure 3 It is a three-dimensional view of the unfolded utility model from another perspective;

[0017] Figure 4 It is a three-dimensional view of the unfolded utility model from another perspective;

[0018] Figure 5 It is Figure 2 It is a three-dimensional view of the plug-in cross rod after being cut open

[0019] In the figure: 1, main cross rod; 11, rotating column; 2, side rod; 21, stamping concave point; 22, universal wheel; 23, receiving groove; 3, plug-in cross rod; 31, buckle pin; 32, stepped groove; 33, wheel receiving groove; 4, connecting plate; 41, arc-shaped clamping groove. DETAILED DESCRIPTION

[0020] Please refer to Figures 1-5 The utility model provides the following technical scheme: including main cross rod 1, both ends of main cross rod 1 are rotatably connected with side rod 2, the maximum angle of rotation of side rod 2 is 90 degrees, the section of side rod 2 is "Fang" character shape, and side rod 2 has receiving groove 23 for receiving main cross rod 1.

[0021] The bottom surface of side rod 2 is rotatably connected with universal wheel 22 at both ends, plug-in cross rod 3 is inserted between the two side rods 2, plug-in cross rod 3 is inserted in receiving groove 23, and main cross rod 1 and plug-in cross rod 3 are fixedly connected through connecting plate 4.

[0022] In the embodiment, the main cross bar 1 is used as the main connecting component, the side bar 2 is rotationally connected with the main cross bar 1, the receiving groove 23 surrounds the main cross bar 1, and the maximum rotation angle of the side bar 2 with the main cross bar 1 is 90 degrees. There are many ways to limit the rotation angle of the main cross bar 1 and the side bar 2, for example, a stopper is added to the main cross bar 1 to limit the rotation of the side bar 2 to 90 degrees, or a stopper is arranged at the rotation shaft between the main cross bar 1 and the side bar 2 to limit the rotation of the main cross bar 1 and the side bar 2 to 90 degrees by blocking. Since the main cross bar 1 and the side bar 2 are limited to rotate 90 degrees in various ways, the implementation of the rotation of 90 degrees is various and is prior art, which will not be described here.

[0023] In the closed stage of the side bar 2, the receiving groove 23 surrounds the main cross bar 1 to form a bar type. In the bar type, the universal wheel 22 is located below the side bar 2, and the four universal wheels 22 are distributed side by side. The plug-in cross bar 3 is provided with a wheel receiving groove 33 for receiving the universal wheel 22 on the side close to the main cross bar 1, and the wheel receiving groove 33 can directly receive the universal wheel 22. The entire vehicle body frame forms a bar type structure and the wheel body cannot contact the vehicle body, thereby protecting the vehicle body.

[0024] In order to avoid interference of the structure, the length of the side bar 2 is less than half the length of the main cross bar 1, and when the two side bars 2 are rotated to be parallel to the main cross bar 1, the side bar 2 can wrap the main cross bar 1. Please refer to Figure 1 , the depth of the receiving groove 23 is greater than the width of the main cross bar 1, and at this time the main cross bar 1 can be completely received in the receiving groove 23.

[0025] The cross section of the main cross bar 1 is in the shape of a “Fang” character, and the groove center of the main cross bar 1 is fixedly connected with a rotating column 11.

[0026] The main cross bar 1 with the “Fang” character cross section can ensure lightweight, and the groove center is supported by the rotating column 11 to avoid deformation of the main cross bar 1. Please refer to Figure 2 , the maximum rotation angle of the side bar 2 is 90 degrees, and in the Figure 2 attitude, the side bar 2 cannot continue to rotate outward, and when the side bar 2 rotates inward, it is limited by the plug-in cross bar 3. Therefore, the main cross bar 1 is connected with the plug-in cross bar 3 through the connecting plate 4 to realize the stability of the entire vehicle frame. In order to realize stability and meet the requirements of receiving, the following improvements are made:

[0027] The connecting plate 4 is rotationally connected with the rotating column 11, the middle part of the wheel receiving groove 33 is fixedly connected with a buckling pin 31, the end of the connecting plate 4 away from the rotating column 11 is provided with an arc-shaped clamping groove 41, the top of the buckling pin 31 is provided with a stepped groove 32, the arc-shaped clamping groove 41 is slidingly connected with the stepped groove 32, the upper and lower end faces of the side bar 2 are both provided with a stamping concave point 21, the stamping concave point 21 forms a protrusion on the inner wall of the receiving groove 23, and the plug-in cross bar 3 is in contact with the protrusion.

[0028] The improved advantage is that the connecting plate 4 can be rotated into the groove of the main cross bar 1 through the rotating column 11 in the rod storage case, and the width of the connecting plate 4 is less than the groove depth of the rotating column 11. In use, the connecting plate 4 is rotated to the insertion cross bar 3, the arc-shaped clamping groove 41 is clamped with the stepped groove 32, and the stepped surface of the stepped groove 32 supports the arc-shaped clamping groove 41.

[0029] Furthermore, the cross section of the connecting plate 4 is L-shaped, and the connecting plate 4 is less likely to deform during stress.

[0030] After the arc-shaped clamping groove 41 is clamped with the stepped groove 32, the insertion cross bar 3 cannot slide away from the main cross bar 1, and the insertion cross bar 3 also contacts the stamping concave point 21, so that the insertion cross bar 3 is fixed by the limiting of the arc-shaped clamping groove 41 and the stamping concave point 21.

[0031] In order to realize stability, the connecting plate 4 and the rotating column 11 have a rotating resistance, which can be realized by setting a rubber layer on the sliding surface or increasing the sliding friction of the sliding surface. The rotating resistance can ensure that the connecting plate 4 does not rotate with the main cross bar 1 during use.

[0032] Similarly, the inner wall of the wheel collecting groove 33 can be provided with a rubber layer, and when the wheel collecting groove 33 contacts the universal wheel 22, the sliding friction can be increased, so that the wheel collecting groove 33 is not easy to separate from the universal wheel 22.

[0033] It is to be supplemented that the framework of the technical solution can be directly used for conveying box goods, and if it is loose goods, a pad needs to be matched, which can be spliced or folded.

Claims

1. A four-wheeled vehicle, characterized by: The utility model provides a kind of foldable trolley, including main crossbar (1), the side pole (2) is rotatably connected in both ends of the main crossbar (1), the maximum angle of rotation of the side pole (2) is 90 degrees, the section of the side pole (2) is '' Heng ” character, the side pole (2) has the receiving groove (23) of receiving the main crossbar (1); The bottom surface of the side pole (2) is rotatably connected with universal wheel (22) in both ends, and the plug-in crossbar (3) is inserted between the two side poles (2), the plug-in crossbar (3) is inserted in the receiving groove (23), the receiving wheel groove (33) for receiving the universal wheel (22) is formed in the side of the plug-in crossbar (3) close to the main crossbar (1), and the main crossbar (1) and the plug-in crossbar (3) are fixedly connected by the connecting plate (4).

2. A four-wheeled vehicle according to claim 1, characterized in that: The length of the side pole (2) is less than half the length of the main crossbar (1).

3. A four-wheeled vehicle as claimed in claim 1, characterized in that: The section shape of the main crossbar (1) is '' Heng ” character, the rotating column (11) is fixedly connected at the center of the groove body of the main crossbar (1), and the connecting plate (4) is rotatably connected with the rotating column (11).

4. A four-wheeled vehicle as claimed in claim 3, characterized in that: The middle part of the receiving wheel groove (33) is fixedly connected with the buckling pin (31), one end of the connecting plate (4) away from the rotating column (11) is provided with arc-shaped clamping groove (41), the top of the buckling pin (31) is provided with stepped groove (32), and the arc-shaped clamping groove (41) is slidably connected with the stepped groove (32).

5. A four-wheeled vehicle as claimed in claim 1, characterized in that: The upper and lower end surfaces of the side pole (2) are provided with stamping concave points (21), the stamping concave points (21) form protrusions on the inner wall of the receiving groove (23), and the plug-in crossbar (3) is in contact with the protrusions.

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