A frame and cart

Abstract

The application discloses a kind of frame and cart, including intermediate connecting piece, intermediate connecting piece is connected with bottom frame cross pipe in the direction of side frame body relative connection, one end of bottom frame cross pipe is rotatably connected with intermediate connecting piece, and the other end is rotatably connected in side frame body;Pipe connecting piece, pipe connecting piece is set to intermediate connecting piece direction towards first folding assembly;First swing pipe, one end of first swing pipe is rotatably connected with intermediate connecting piece, and the other end is rotatably connected with first swing pipe connecting piece;Second swing pipe is arranged at an angle, one end of second swing pipe is rotatably connected with first swing pipe connecting piece, and the other end is rotatably connected with side vertical pipe.The application is connected directly by the cooperation of this structure, so that bottom frame cross pipe can realize with side frame body, relative to other connection mode, greatly improve the stability of structure, improve the upper limit of loading, and user can obviously feel folding more convenient when using.

Description

Technical Field

[0001] This invention relates to the field of cargo vehicle technology, and in particular to a frame and a trolley. Background Technology

[0002] A trolley is a manually pushed or pulled transport vehicle. It is the ancestor of all vehicles. With technological advancements, trolleys can also be attached to motor vehicles to carry goods. Although trolley material handling technology has continuously evolved, trolleys remain an indispensable transport tool to this day. Trolleys are widely used in production and daily life because they are inexpensive, easy to maintain, convenient to operate, and lightweight, making them very convenient for moving lighter items over short distances.

[0003] The stroller has length in two directions. When the length in one direction is greater, the following two methods are generally used to achieve a folding effect:

[0004] The first approach involves increasing the length of the base frame cross braces to accommodate the lateral length. However, increasing the length of the base frame cross braces results in the cross braces being higher than the side vertical bars when the frame is folded up, making it difficult to store. Furthermore, increasing the length of the base frame cross braces reduces the stability of the bottom structure, leading to a lower loading limit.

[0005] The second method involves using multiple sets of intersecting diagonal braces in parallel to increase the length in the left and right directions. While this structure ensures that the vertical length remains unchanged after folding, it creates numerous and large cavities in the base frame, resulting in poor support and poor loading performance.

[0006] Therefore, given this situation, how to provide a frame that is easy to load and convenient to fold, and a trolley with such a frame, is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of existing technologies in terms of frame loading and folding, and to provide a frame and trolley.

[0008] The technical problem solved by this invention is achieved through the following technical solution:

[0009] A vehicle frame includes opposing side frame bodies connected by a first folding assembly, each side frame body including opposing side vertical tubes connected by a second folding assembly, and a bottom frame body comprising:

[0010] An intermediate connector is connected to a bottom frame horizontal tube in the direction of the side frame body. One end of the bottom frame horizontal tube is rotatably connected to the intermediate connector, and the other end is rotatably connected to the side frame body.

[0011] A sway tube connector, wherein the sway tube connector is disposed on the intermediate connector in the direction of the first gathering component;

[0012] The first oscillating tube has one end rotatably connected to the intermediate connecting member and the other end rotatably connected to the oscillating tube connecting member;

[0013] The second oscillating tube is set at an angle, with one end of the second oscillating tube rotatably connected to the oscillating tube connector and the other end rotatably connected to the side vertical tube.

[0014] A trolley includes a frame, with rollers provided on the underside of the frame.

[0015] The advantages and positive effects of this invention are:

[0016] 1. In this invention, the intermediate connector is located at the center line of the opposite side frame, forming a core support for the bottom of the frame. The bottom frame horizontal tube directly connects the intermediate connector and the side frame. Compared with other movable connection methods, the connection structure is more stable, the load-bearing effect of the frame is better, and it is more conducive to the folding of the side frame. The swing tube connector forms another support center on the basis of the intermediate connector, further increasing the support effect of the bottom frame.

[0017] 2. In this invention, the second swing tube and the first swing tube are connected in a two-stage manner. With the swing tube connector, the second swing tube, the first swing tube and the middle connector can achieve a good driving effect, making the bottom frame body easy to fold. More importantly, through the cooperation of this structure, the bottom frame horizontal tube can be directly rotated to connect with the side frame body. Compared with other connection methods, this greatly improves the stability of the structure, and the user can clearly feel that folding is more convenient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the isometric structure of the present invention;

[0019] Figure 2 This is a top view of the present invention;

[0020] Figure 3 This is an isometric view of the bottom frame body being retracted in this invention;

[0021] Figure 4 This is the present invention. Figure 3 A schematic diagram of the structure viewed from below at point A;

[0022] Figure 5 This is the present invention. Figure 3 Cross-sectional view at point A in the middle;

[0023] Figure 6 This is an isometric view of the gathering process of the present invention;

[0024] Figure 7 This is a front view of the folding process of the present invention;

[0025] Figure 8 This is the isometric view of the retracted portion of the present invention.

[0026] In the diagram: 100, side frame; 100a, front frame; 100b, rear frame; 110, side vertical tube; 120, second folding assembly; 121, first pipe fitting; 122, second pipe fitting; 130, side bottom frame; 140, side sliding member; 150, middle vertical tube; 160, middle bottom frame; 161, fixing part; 1611, groove; 162, fin; 170, middle sliding member; 200, first folding assembly; 210, third pipe fitting; 220, fourth pipe fitting; 300, bottom frame; 310, middle connector; 320, bottom frame horizontal tube; 330, swing tube connector; 340, first swing tube; 350, second swing tube; 400, roller; 500, handle. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0031] In three-dimensional space, there are three directions: x, y, and z. Correspondingly, on the chassis, x, y, and z determine the upper limit of the chassis volume. Given the same height z, the longer the chassis is in the x and y directions, the larger the volume. In existing technology, when the length in the x direction is relatively large compared to the y direction, the 300mm base frame is generally adapted in two ways:

[0032] The first method, when increasing its length in the x-direction, is to increase the length of the cross braces of the base frame to match the length in the lateral direction. This method is the simplest and most direct. However, increasing the length of the cross braces of the base frame will cause the cross braces to be higher than the side vertical bars in the z-direction after being folded up (the cross braces of the base frame are vertical). Therefore, after folding up, the overall length in the z-direction will be longer, making it inconvenient to store. At the same time, the longer the cross braces of the base frame, the higher the requirements for the stability and quality of the overall connection structure. Under the same production cost, the bottom structure stability of longer cross braces is lower, and the loading limit is lower.

[0033] The second approach involves using multiple sets of intersecting diagonal braces in parallel to increase the length in the left and right directions. While this structure ensures that the vertical length remains unchanged after folding, the bottom frame 300 and the side frame 100 cannot form a good and stable connection. Furthermore, the parallel connection of multiple sets of diagonal braces results in numerous and large cavities in the bottom frame, especially in the center of the bottom frame (where consumers are most likely to place items), where the support is generally weak. This leads to poor loading performance and the fabric connecting the frame is more prone to damage.

[0034] To address the aforementioned issues, a frame with higher structural stability, better load-bearing capacity, and easier folding is provided. This frame includes opposing side frame bodies 100, connected by a first folding assembly 200. The first folding assembly 200 connects to the opposing side frame bodies 100, enabling folding connection of the opposing side frame bodies 100 in the y-direction. Each side frame body 100 includes opposing side vertical tubes 110, connected by a second folding assembly 120. The second folding assembly 120 connects to the side vertical tubes 110, thereby achieving folding connection of the side frame bodies 100 in the x-direction. The frame also includes a bottom frame body 300, which connects to the side frame bodies 100 to form the overall frame structure, primarily serving a load-bearing function. The bottom frame body 300 includes:

[0035] The intermediate connector 310 is located at the midline between the two side frame bodies 100, providing support for the bottom of the frame. The intermediate connector 310 is connected to the bottom frame cross tube 320 in the direction of the side frame body 100. One end of the bottom frame cross tube 320 is rotatably connected to the intermediate connector 310, and the other end is rotatably connected to the side frame body 100. The bottom frame cross tube 320 directly connects the intermediate connector 310 and the side frame body 100. Compared with other movable connection methods, the connection structure is more stable, the load-bearing capacity of the frame is better, and it is more conducive to the folding of the side frame body 100.

[0036] The sway tube connector 330 is disposed on the intermediate connector 310 in the direction of the first gathering component 200, forming another support center on the basis of the intermediate connector 310, further increasing the support effect of the bottom frame 300.

[0037] The first oscillating tube 340 has one end rotatably connected to the intermediate connecting member 310 and the other end rotatably connected to the oscillating tube connecting member 330. The first oscillating tube 340 serves to connect the oscillating tube connecting member 330 and the intermediate connecting member 310.

[0038] The second swing tube 350 is angled, with one end rotatably connected to the swing tube connector 330 and the other end rotatably connected to the side vertical tube 110. The second swing tube 350 and the first swing tube 340 are connected in a two-section manner. Together with the swing tube connector 330, the second swing tube 350, the first swing tube 340 and the middle connector 310 can achieve a good driving effect, making the bottom frame body 300 easy to fold. More importantly, through the cooperation of this structure, the bottom frame horizontal tube 320 can be directly rotatably connected to the side frame body 100. Compared with other connection methods, the stability of the structure is greatly improved, and the user can clearly feel that folding is more convenient.

[0039] Meanwhile, the coordinated connection of the second swing tube 350, the first swing tube 340, and the bottom frame horizontal tube 320 allows for proportional changes in their lengths. This provides more effective support and folding effect compared to existing technologies when the length in the x-direction is longer. Furthermore, it ensures that even when the length of the vertical tube (z-direction) is short, the folded tube will not protrude beyond the top and bottom of the vertical tube. In other words, this solution offers greater flexibility in selecting variables in x, y, and z, allowing manufacturers to produce products of different specifications based on various circumstances.

[0040] On the other hand, the coordinated connection of the second swing tube 350, the first swing tube 340 and the bottom frame cross tube 320, based on the above effects, has a more reasonable arrangement, which can ensure good bottom support and thus make the frame connecting fabric last longer.

[0041] The side frame 100 includes a middle bottom frame 160. The opposite sides of the middle bottom frame 160 are rotatably connected to second gathering components 120. The bottom frame horizontal tube 320 is rotatably connected to the middle bottom frame 160 and connected in the x direction through multiple sets of second gathering components 120. The middle bottom frame 160 serves as the connecting element for the second gathering components 120. The bottom frame horizontal tube 320 is rotatably connected to the middle bottom frame 160, so that the middle bottom frame 160 is directly connected to the second gathering components 120 and the bottom frame horizontal tube 320. Compared with other movable connection methods, this solution has better stability and smoother gathering.

[0042] The second swing tube 350 connected to the swing tube connector 330 rotates in the same direction as the first swing tube 340. Correspondingly, the swing tube connector has a slot with an opening facing downward and to the side. The first swing tube 340 connected to the intermediate connector 310 rotates in the opposite direction to the bottom frame horizontal tube 320. Correspondingly, the intermediate connector has two openings facing upward and left / right, and two openings facing downward and front / back, so that the bottom frame body 300 can be folded and unfolded.

[0043] In other words, one end of the first swing tube 340 is rotatably connected to the intermediate connector 310. During the folding process, the other ends of the two first swing tubes 340 (the ends not rotatably connected to the intermediate connector 310) rotate upwards with the intermediate connector 310 as the origin. Therefore, one of the first swing tubes 340 moves clockwise and the other moves counterclockwise. One end of the bottom frame horizontal tube 320 is rotatably connected to the intermediate connector 310. The other end of the bottom frame horizontal tube 320 (the end not rotatably connected to the intermediate connector 310) rotates downwards with the intermediate connector 310 as the origin. Therefore, one of the bottom frame horizontal tubes 320 rotates clockwise and the other rotates counterclockwise. Through the cooperation of this structure, the folded volume of the bottom frame body 300 can be effectively reduced, and the force transmission effect between the components is better, resulting in a better user experience when folding.

[0044] One end of the first sway tube 340 is rotatably connected to the sway tube connector 330. During the retraction process, the other end (the end not rotatably connected to the sway tube connector 330) rotates downward with the sway tube connector 330 as the origin. One end of the second tube 122 is rotatably connected to the sway tube connector 330, and the other end (the end not rotatably connected to the sway tube connector 330) rotates downward with the sway tube connector 330 as the origin. It can be understood that when the first sway tube 340 moves clockwise with the sway tube connector 330 as the center, the second sway tube 350 moves counterclockwise. The same principle applies to the reverse.

[0045] The bottom frame horizontal tube 320 extends from the rotatable connection point with the middle bottom frame member 160 away from the middle connector 310, so that the end of the bottom frame horizontal tube 320 can abut against the middle bottom frame member 160.

[0046] The middle bottom frame 160 has a groove 1611, which is adapted to the end of the bottom frame horizontal tube 320 so that the bottom frame horizontal tube 320 abuts against the middle bottom frame 160.

[0047] The second retractable assembly 120 includes a first tube 121 and a second tube 122, which are rotatably connected. One end of the first tube 121 on one side is rotatably connected to the side vertical tube 110, and the other end is movably connected to one end of the middle vertical tube 150 on the other side. One end of the second tube 122 on one side is rotatably connected to the middle bottom frame 160, and the other end is slidably connected to the side vertical tube 110. In this way, the upper limit of the end movement of the second retractable assembly 120 is within the height of the side vertical tube 110 in the z-direction. When the second retractable assembly 120 is vertical after being retracted, its length will not exceed the side vertical tube 110, thus keeping the length in the z-direction within the original length after retracting.

[0048] The side frame 100 also includes a middle vertical tube 150, which is connected to the middle bottom frame 160. The middle vertical tube 150 is slidably connected to a middle sliding member 170, which is rotatably connected to the first tube 121.

[0049] The side vertical tube 110 is slidably connected to a side sliding member 140, and the side sliding member 140 is rotatably connected to the second tube 122. The first gathering assembly 200 includes a third tube 210 and a fourth tube 220, which are rotatably connected to each other. One end of the third tube 210 is rotatably connected to the side vertical tube 110 on one side, and the other end is rotatably connected to the side sliding member 140 on the other side. One end of the fourth tube 220 is rotatably connected to the side sliding member 140 on one side, and the other end is rotatably connected to the side sliding member 140 on the other side.

[0050] Let L1 be the distance between the two rotating connection points of the first swing tube 340, L2 be the distance between the two rotating connection points of the bottom frame horizontal tube 320, and L3 be the distance between the two rotating connection points of the second swing tube 350. Then the range of L1+L2-L3 is ±30mm.

[0051] like Figure 1 As shown, the frame includes a front frame 100a, a rear frame 100b and a bottom frame 300. The front frame 100a and the rear frame 100b are connected to the first folding assembly 200 on the left and right sides respectively. The front frame 100a and the rear frame 100b are arranged in parallel.

[0052] like Figure 1As shown, taking the front frame 100a as an example, the whole extends in the left and right direction, including the left and right side vertical tubes 110, and the middle vertical tube 150 between the two side vertical tubes 110. The side bottom frame 130 is connected to the lower side of the side vertical tube 110, and the side sliding member 140 slides up and down on the side vertical tube 110. The middle bottom frame 160 is connected to the lower side of the middle vertical tube 150, and the middle sliding member 170 slides up and down on the middle vertical tube 150.

[0053] like Figure 1 As shown, two sets of first gathering components 200 are connected between the front frame 100a and the rear frame 100b. The third tube 210 and the fourth tube 220 of the first gathering components 200 are cross-connected and are rotatably connected by pins at the connection position. The front end of the third tube 210 is rotatably connected to the front side bottom frame 130 and the rear end is rotatably connected to the rear side sliding member 140. The front end of the fourth tube 220 is rotatably connected to the front side sliding member 140 and the rear end is rotatably connected to the rear side bottom frame 130.

[0054] like Figure 1 As shown, the side frame 100 includes two sets of second gathering components 120, distributed on the left and right sides of the middle vertical tube 150. The second gathering component 120 includes a first tube 121 and a second tube 122 of equal length and rotatably connected. The intersection of the first tube 121 and the second tube 122 is connected by a pin. Taking the second gathering component 120 at the left end of the front side frame 100a as an example, the left end of the first tube 121 is rotatably connected to the side bottom frame 130, and the right end is rotatably connected to the middle sliding member 170. The left end of the second tube 122 is rotatably connected to the side sliding member 140, and the right end is rotatably connected to the middle bottom frame 160.

[0055] like Figure 1As shown, the intermediate connector 310 is located in the middle of the bottom frame 300, which is the midline between the front frame 100a and the rear frame 100b. Ideally, it is located at the center of the bottom frame 300. One end of the bottom frame horizontal tube 320 is rotatably connected to the intermediate connector 310, and the other end is rotatably connected to the intermediate bottom frame member 160. The bottom frame horizontal tube 320 extends in the front-rear direction and is relatively perpendicular to the plane of the side frame 100. The intermediate connector 310 is provided with a swing tube connector 33 in the direction towards the first gathering assembly 200. 0. One end of the first oscillating tube 340 is connected to the middle connector 310, and the other end is rotatably connected to the oscillating tube connector 330. Taking the left oscillating tube connector 330 as an example, the left side of the oscillating tube connector 330 is connected to two second oscillating tubes 350. The two second oscillating tubes 350 are set at an angle. The right end of each second oscillating tube 350 is rotatably connected to the oscillating tube connector 330. The left end of the front second oscillating tube 350 is rotatably connected to the side bottom frame 130 on the front left side. The left end of the rear second oscillating tube 350 is rotatably connected to the side bottom frame 130 on the rear left side.

[0056] like Figure 2 As shown, the planes of the front frame 100a and the rear frame 100b are parallel, and the planes of the first folding components 200 on the left and right sides are parallel to each other, thus connecting to form a square frame. The extension line of the first swing tube 340 of the bottom frame 300 is perpendicular to the plane of the first folding component 200. The first swing tube 340 is perpendicular to the bottom frame horizontal tube 320, and the first swing tube 340 and the second swing tube 350 are Y-shaped.

[0057] Let L1 be the distance between the two rotating connection points of the first swing tube 340, L2 be the distance between the two rotating connection points of the bottom frame horizontal tube 320, and L3 be the distance between the two rotating connection points of the second swing tube 350. Then, the range of L1 + L2 - L3 is ±30mm. Ideally, L1 + L2 = L3. In some embodiments, the difference between the lengths of L1 + L2 and L3 can also be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, or 30mm.

[0058] like Figure 2As shown, the intermediate connector 310 is located at the center of the square frame. The bottom frame horizontal tube 320 and the first swing tube 340 are arranged in a cross shape and are rotatably connected to the intermediate connector 310 respectively. One end of the second swing tube 350 is rotatably connected to the side bottom frame 130. In other words, the bottom frame body 300 is connected to the side vertical tubes 110 at the four corners of the frame, and is directly rotatably connected to the middle position of the long side. This achieves that every connection point of the frame is directly connected. Together with the central vertical tube, the overall stability of the frame is better, the load-bearing capacity is greater, and it also has a good folding effect.

[0059] like Figure 3 As shown, both ends of the bottom frame horizontal tube 320, the first swing tube 340, and the second swing tube 350 are rotatable connection ends. The two ends of the bottom frame horizontal tube 320 are rotatably connected to the middle bottom frame member 160 and the middle connector 310, respectively. The two ends of the first swing tube 340 are rotatably connected to the middle connector 310 and the swing tube connector 330, respectively. The two ends of the second swing tube 350 are rotatably connected to the side bottom frame member 130 and the swing tube connector 330, respectively. When retracted, the swing tube connector 330 and the middle connector 310 move upward relative to each other. The side bottom frame member 130 moves towards the initial position of the middle connector 310 along the diagonal angle of the frame. The middle bottom frame member 160 moves towards the initial position of the middle connector 310.

[0060] like Figure 3 As shown, during the retraction process, the swing tube connector 330 is displaced upward, causing the first swing tube 340, the second swing tube 350 and the intermediate connector 310 to rotate upward. Consequently, one end of the first swing tube 340 and the intermediate connector 310 rotates downward relative to the swing tube connector 330. Similarly, the end of the second swing tube 350 connected to the side bottom frame 130 rotates downward relative to the swing tube connector 330.

[0061] like Figure 3 As shown, P2 is the relative vertical line of the swing tube connector 330 moving up and down. The swing tube connector 330 is used as the dividing line to divide the upper and lower sections. a1 is the angle between the second swing tube 350 and the lower section of P2, and a2 is the angle between the first swing tube 340 and the lower section of P2. During the closing process, the angles of a1 and a2 gradually decrease from 90°.

[0062] like Figure 3As shown, the sway tube connector 330 moves upward to drive the first sway tube 340 to rotate, and then the rotation of the first sway tube 340 drives the intermediate connector 310 to move upward. In a basically consistent manner, the second sway tube 350 and the bottom frame vertical tube drive the side bottom frame 130 and the middle bottom frame 160 to move towards the center position. The sway tube connector 330 moves ahead of the intermediate connector 310. Therefore, with the intermediate connector 310 as a reference, the connection end between the first sway tube 340 and the sway tube connector 330 rotates upward relative to the intermediate connector 310. Similarly, the connection end between the bottom frame horizontal tube 320 and the middle bottom frame 160 rotates downward relative to the intermediate connector 310.

[0063] like Figure 3 As shown, P1 is the relative vertical line of the middle connector 310 moving up and down. The middle connector 310 is used as the dividing line to divide the upper and lower sections. a3 is the angle between the bottom frame horizontal tube 320 and the lower section of P1, and a4 is the angle between the first swing tube 340 and the upper section of P1. During the retraction process, the angles of a3 and a4 gradually decrease from 90°. Through this connection and cooperation method, space and structure can be effectively utilized to achieve the effect of good support when unfolded, excellent linkage when retracted, and good spatial performance after retraction.

[0064] like Figure 4 As shown, the intermediate bottom frame 160 includes a fixing part 161. Two downwardly extending fins 162 are formed on the inner side of the fixing part 161 (the side facing the intermediate connector 310). The bottom frame horizontal tube 320 is located between the two fins 162 and is rotatably connected by a pin. (Refer to...) Figure 5 The rotatable connection point between the fin 162 and the bottom frame horizontal tube 320 is located on the lower side of the fixing part 161. One end of the bottom frame horizontal tube 320 rotatably connected to the fin 162 extends outward from the fixing part 161 (towards the side facing away from the intermediate connector 310), with the extension length accounting for 1 / 3 of the lower side of the fixing part 161. In some embodiments, this proportion may also be 1 / 4, 1 / 2, or 2 / 3, thereby enabling the end of the bottom frame horizontal tube 320 to abut against the lower side of the positioning part when the bottom frame horizontal tube 320 is horizontal or at an angle within 5°, thereby forming a snap-fit ​​position between the bottom frame horizontal tube 320 and the intermediate bottom frame member 160, increasing the overall stability of the frame.

[0065] refer to Figure 4 and Figure 5 A groove 1611 is formed on the lower side of the fixing part 161. The groove 1611 extends in the direction of the second swing tube 350. The length of the groove 1611 is 3-5 mm longer than the end of the bottom frame horizontal tube 320.

[0066] like Figure 6As shown, during the folding process, the user moves the two swing tube connectors 330 upwards. The swing tube connectors 330 drive the middle connector 310 upwards through the first swing tube 340. The second swing tube 350 changes angle, causing the side bottom frame 130 and the side vertical tube 110 to move towards the center position. The middle connector 310 drives the middle vertical tube 150 to move towards the center position through the bottom frame horizontal tube 320. In other words, the bottom frame body 300 simultaneously drives the side vertical tube 110 and the middle vertical tube 150 to move.

[0067] like Figure 7 As shown, through the cooperation of the first folding assembly 200 and the second folding assembly 120, the side bottom frame 130 and the middle bottom frame 160 are basically located on the same plane during the folding process. That is to say, during the folding process, after folding, and in the unfolded state, the relative position of the side bottom frame 130 and the middle bottom frame 160 in the z direction will not change much. This makes it easy to store the frame after it is folded up. At the same time, the structural form of the bottom frame 300 allows the side frame 100 to still achieve a good folding effect even without the middle vertical tube 150. Adding the middle vertical tube 150 increases the overall structural strength of the frame.

[0068] like Figure 8 As shown, after being folded up, the overall length of the frame is within the length of the side vertical tube 110 and the middle vertical tube 150 in the z direction. After being folded up, the second swing tube 350 and the first swing tube 340 of the bottom frame 300 fold the frame in multiple sections in different directions in the x direction, so that the total length of the bottom frame 300 in the z direction after being folded up does not exceed the side vertical tube 110, which is convenient for storage.

[0069] like Figure 1 As shown, a trolley has rollers 400 installed on the underside of the side bottom frame 130 of the frame. The rollers 400 are detachably connected to the side bottom frame 130. A handle 500 is rotatably installed on the right side of the frame, thus enabling it to be used as a trolley.

[0070] It should be emphasized that the embodiments described in this invention are illustrative rather than limiting. Therefore, this invention is not limited to the embodiments described in the specific implementation. Any other implementation methods derived by those skilled in the art based on the technical solutions of this invention also fall within the scope of protection of this invention.

Claims

1. A vehicle frame comprising oppositely arranged side frame bodies (100), a first folding assembly (200) being connected between the side frame bodies (100), the side frame bodies (100) comprising oppositely arranged side edge uprights (110), a second folding assembly (120) being connected between the side edge uprights (110), characterized in that: Also include the bottom frame body (300), the bottom frame body (300) includes: The intermediate connecting piece (310) is connected with the bottom frame cross pipe (320) in the direction of the side frame body (100), one end of the bottom frame cross pipe (320) is rotatably connected with the intermediate connecting piece (310), and the other end is rotatably connected with the side frame body (100); The swing pipe connecting piece (330) is arranged in the direction of the first folding assembly (200) of the intermediate connecting piece (310); The first swing pipe (340) is rotatably connected with the intermediate connecting piece (310) at one end, and rotatably connected with the swing pipe connecting piece (330) at the other end; The second swing pipe (350) is rotatably connected with the swing pipe connecting piece (330) at one end, and rotatably connected with the side vertical pipe (110) at the other end; The second swing pipe (350) connected with the swing pipe connecting piece (330) rotates in the same direction with the first swing pipe (340), the first swing pipe (340) connected with the intermediate connecting piece (310) rotates in the opposite direction with the bottom frame cross pipe (320), so that the bottom frame body (300) realizes folding and unfolding.

2. A vehicle frame according to claim 1, wherein: The side frame body (100) includes an intermediate bottom frame (160), and the opposite sides of the intermediate bottom frame (160) are rotatably connected with second folding assemblies (120). The bottom frame cross pipe (320) is rotatably connected with the intermediate bottom frame (160).

3. Frame according to any of claims 1-2, characterized in that: The bottom frame cross pipe (320) extends from the rotatable connection point with the intermediate bottom frame (160) away from the intermediate connecting piece (310), so that the end of the bottom frame cross pipe (320) can abut against the intermediate bottom frame (160).

4. A vehicle frame as claimed in claim 3, wherein: The intermediate bottom frame (160) is formed with a groove (1611), and the groove (1611) is adapted to the end of the bottom frame cross pipe (320), so that the bottom frame cross pipe (320) abuts against the intermediate bottom frame (160).

5. A frame according to any one of claims 1-2, characterized in that: The second folding assembly (120) includes a first pipe (121) and a second pipe (122), the first pipe (121) and the second pipe (122) are cross-rotatably connected, one side of the first pipe (121) is rotatably connected with the side vertical pipe (110) at one end and movably connected with the intermediate vertical pipe (150) at the other end, and the other side of the second pipe (122) is rotatably connected with the intermediate bottom frame (160) at one end and slidably connected with the side vertical pipe (110) at the other end.

6. A vehicle frame according to claim 5, wherein: The side frame body (100) further includes an intermediate vertical pipe (150), the intermediate vertical pipe (150) is connected with the intermediate bottom frame (160), the intermediate vertical pipe (150) is slidably connected with an intermediate sliding piece (170), and the intermediate sliding piece (170) is rotatably connected with the first pipe (121).

7. A vehicle frame as claimed in claim 5, wherein: The side vertical pipes (110) are slidingly connected with side sliding members (140), the side sliding members (140) are rotationally connected with the second pipe members (122), the first folding assembly (200) comprises third pipe members (210) and fourth pipe members (220), the third pipe members (210) and the fourth pipe members (220) are cross-rotationally connected, one end of the third pipe members (210) is rotationally connected with one side of the side vertical pipes (110), the other end is rotationally connected with the other side of the side sliding members (140), one end of the fourth pipe members (220) is rotationally connected with one side of the side sliding members (140), the other end is rotationally connected with the other side of the side sliding members (140).

8. A vehicle frame as defined in claim 1, wherein: The distance between the two rotationally connected points of the first swing pipe (340) is defined as L1, the distance between the two rotationally connected points of the bottom frame horizontal pipe (320) is defined as L2, and the distance between the two rotationally connected points of the second swing pipe (350) is defined as L3, and the range of L1+L2-L3 is ±30mm.

9. A cart characterized by, The vehicle frame comprises a frame body, a front fork, a rear fork, a front wheel, a rear wheel, a steering handle, a seat, a steering rod, a steering column, a steering shaft, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering handle, a steering

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