Bottom-frame-free frame and cart

Abstract

The utility model relates to the field of carts, in particular to a frame without a bottom frame and a cart. The frame comprises two first side frames and two second side frames; the first side frame comprises two stand columns which are sequentially arranged in the second direction and provided with idler wheels at the bottoms, and a supporting assembly and a supporting frame which are arranged between the two stand columns. The supporting assembly comprises two supporting rods with one ends hinged to each other. The two ends of the supporting assembly form first movable ends, and the first movable ends are connected to the two stand columns correspondingly and can rotate and vertically slide relative to the stand columns. The supporting frame comprises a V-shaped connecting rod, and the V-shaped connecting rod comprises two connecting rods with one ends hinged to each other; the frame further comprises a plurality of flexible supporting belts used for bearing the bag bottom of the vehicle bag, and the supporting belts are sequentially arranged in the second direction. The two ends of the supporting belt are connected to the two opposite supporting rods in the first direction respectively. The weight of the whole frame can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of trolleys, in particular to a bottom frameless trolley frame and trolley. BACKGROUND

[0002] Trolleys, as commonly used transport tools, have a wide range of applications in daily life. With the development of technology, in order to facilitate storage and packaging, some trolleys in the related art are often designed as foldable structures, which mainly consist of a foldable frame and a bag. The frame can be folded and stored along the length and width directions of the trolley body. In order to support the bag bottom, the frame also includes a bottom frame (also known as a bottom bracket), which supports the bag bottom during use.

[0003] In the related art, in order to adapt to the folding of the frame, the bottom frame is usually a foldable hard frame structure, such as a metal link component, which is relatively heavy. Therefore, the existence of such a foldable bottom frame will increase the weight of the entire frame, and thus needs to be improved. CONTENT OF THE UTILITY MODEL

[0004] In order to solve at least one technical problem mentioned in the background art, the purpose of the present application is to provide a bottom frameless trolley frame and trolley.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0006] In a first aspect, the present application provides a bottom frameless trolley frame, comprising two first side frames arranged opposite to each other along a first direction; a second side frame foldable and storable along the first direction is arranged between the two first side frames;

[0007] The first side frame comprises two upright columns arranged in sequence along a second direction and provided with rollers at the bottom, the first direction and the second direction being perpendicular to each other, and the first side frame further comprises a support assembly and a support frame arranged between the two upright columns;

[0008] The support assembly comprises two support rods hingedly connected at one end; the two ends of the support assembly constitute first movable ends, which are respectively connected to the two upright columns and can rotate and vertically slide relative to the upright columns;

[0009] The support frame comprises a V-shaped link, the V-shaped link comprising two connection rods hingedly connected at one end; the two ends of the V-shaped link are respectively hingedly connected to the two upright columns below the first movable ends, and the middle portions of the two connection rods are respectively hingedly connected to the two support rods;

[0010] The trolley frame further comprises a plurality of flexible support belts for supporting the bag bottom of the trolley bag, the support belts being arranged in sequence along the second direction; the two ends of the support belt are respectively connected to the two support rods opposite to each other along the first direction.

[0011] As an optional implementation of the present application, the column is provided with a first sliding sleeve capable of vertically sliding along the column, and the first movable end of the support assembly is hinged to the first sliding sleeve.

[0012] As an optional implementation of the present application, the second side frame is a scissor linkage mechanism, which comprises one or more groups of X-shaped linkages hinged in sequence along the first direction; the X-shaped linkage comprises two rod bodies hinged at the middle; of the two end portions adjacent to one side of the column, the lower end portion is hinged to the first sliding sleeve, and the upper end portion is hinged to the column.

[0013] As an optional implementation of the present application, the support belt is a flexible fabric.

[0014] As an optional implementation of the present application, in the unfolded state of the vehicle frame, the support belt is tensioned between the two support rods on the opposite sides along the first direction.

[0015] As an optional implementation of the present application, in the unfolded state of the vehicle frame, the mutually hinged ends of the two support rods of the first side frame abut each other, so that the two support rods remain in the unfolded state.

[0016] In a second aspect, the present application also provides a bottomless vehicle frame, which comprises two first side frames arranged opposite to each other along a first direction; a second side frame arranged between the two first side frames and capable of being folded along the first direction;

[0017] The first side frame comprises two columns arranged in sequence along a second direction and provided with rollers at the bottom, the first direction and the second direction being perpendicular to each other; the first side frame further comprises a support mechanism and a support linkage mechanism arranged between the two columns;

[0018] The two ends of the support mechanism constitute first movable ends, which are respectively connected to the two columns and capable of rotating and vertically sliding relative to the columns; the support mechanism comprises at least two support assemblies arranged in sequence along the second direction, and a stand rod arranged between the adjacent two support assemblies; the support assembly comprises two support rods hinged at one end to each other; the support assembly is connected to the stand rod at one end adjacent to the stand rod and capable of rotating and vertically sliding relative to the stand rod;

[0019] The two ends of the support linkage mechanism are respectively hinged to the two columns below the first movable ends; the support linkage mechanism comprises at least two support frames corresponding to the support assemblies one by one; the support frame is hinged to the stand rod at one end adjacent to the stand rod; the support frame comprises a V-shaped linkage, which comprises two connection rods hinged at one end to each other, and the middle portions of the two connection rods are respectively hinged to the two support rods of the same support assembly;

[0020] The frame further comprises a plurality of flexible support belts for supporting the bottom of the bag, each of the support belts is arranged in sequence along the second direction, and two ends of each of the support belts are connected to the two support rods respectively.

[0021] As an optional embodiment of the present application, the upright column is provided with a first sliding sleeve capable of vertically sliding along the upright column, and the first movable end of the support mechanism is hinged to the first sliding sleeve; and / or, the upright rod is provided with a second sliding sleeve capable of vertically sliding along the upright rod, and one end of the support assembly adjacent to the upright rod is hinged to the second sliding sleeve.

[0022] As an optional embodiment of the present application, the second side frame is a scissor type linkage structure, which comprises one or more groups of X-shaped linkages hinged in sequence along the first direction, and each X-shaped linkage comprises two rod bodies hinged to each other; among two end portions of the second side frame close to one side of the upright column, the lower end portion is hinged to the first sliding sleeve, and the upper end portion is hinged to the upright column.

[0023] In a third aspect, the present application further provides a stroller, comprising a frame and a bag, wherein the frame adopts the above-mentioned bottomless frame.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] Firstly, in the present application, the flexible support belts are used to support the bottom of the bag, and compared with the traditional stroller which uses a hard bottom frame to support the bottom of the bag, the flexible support belts are lighter in weight, thereby being conducive to reducing the weight of the entire frame. Moreover, the support belts are flexible, and therefore will not interfere with the normal folding of the frame.

[0026] Secondly, the V-shaped linkages arranged in the present application can form a triangular support structure together with the two support rods when the frame is unfolded, thereby being conducive to improving the stability of the frame in the unfolded state.

[0027] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description taken in conjunction with the accompanying drawings. In the drawings, several embodiments of the present application are shown by way of example and not limitation, in which:

[0029] In the drawings, identical or corresponding reference numerals indicate identical or corresponding parts.

[0030] Figure 1Structure schematic diagram of example 1 in unfolded state;

[0031] Figure 2 Front view of Figure 1 ;

[0032] Figure 3 Top view of example 1;

[0033] Figure 4 Structure schematic diagram of example 1 in folding process;

[0034] Figure 5 Structure schematic diagram of example 1 in folded state;

[0035] Figure 6 Structure schematic diagram of example 2 in folded state;

[0036] Figure 7 Structure schematic diagram of example 3 Figure 1 ;

[0037] Figure 8 Structure schematic diagram of example 3 Figure 2 .

[0038] Explanation of figure mark:

[0039] 1, first side frame; 11, stand column; 111, roller; 12, support assembly; 121, support rod; 122, hinge joint; 13, support frame; 131, connecting rod; 14, first sliding sleeve; 15, second sliding sleeve; 16, vertical rod;

[0040] 2, second side frame; 21, X-shaped connecting rod; 211, rod body;

[0041] 3, support belt;

[0042] 4, car bag. DETAILED DESCRIPTION

[0043] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] Example 1

[0045] In conjunction with Figures 1-5As shown, the embodiment provides a bottom frameless vehicle frame, which is a foldable vehicle frame and includes two first side frames 1 and two second side frames 2. It is worth mentioning that the bottom frameless claimed by the embodiment refers to that the vehicle frame does not have a hard frame bottom frame.

[0046] As shown, Figure 1 The two first side frames 1 are oppositely arranged along a first direction, and the two second side frames 2 are oppositely arranged along a second direction and connected between the two first side frames 1. The first direction is perpendicular to the second direction, for example, if the width direction of the vehicle frame is regarded as the first direction, then the length direction of the vehicle frame is the second direction.

[0047] The second side frame 2 is a foldable structure, specifically, the second side frame 2 can be folded along the first direction to drive the two first side frames 1 to move towards each other along the first direction.

[0048] In the embodiment, the two first side frames 1 have basically the same structure, and the two second side frames 2 also have basically the same structure, so in the embodiment, for the convenience of description, only one of the first side frame 1 and the second side frame 2 will be taken as an example for specific description.

[0049] The first side frame 1 mainly includes two upright columns 11, a support assembly 12 and a support frame 13.

[0050] As shown, Figure 1 In the first side frame 1, the two upright columns 11 are arranged in sequence along the second direction, and the bottom of each upright column 11 is provided with a roller 111.

[0051] The support assembly 12 is arranged between the two upright columns 11 adjacent along the second direction, specifically, the support assembly 12 includes two support rods 121 hingedly connected at one end, and the two support rods 121 are arranged in sequence along the second direction.

[0052] The two ends of the support assembly 12 constitute first movable ends, and the two first movable ends of the support assembly 12 are respectively connected to the two upright columns 11 and can rotate and vertically slide relative to the upright columns 11. Here, the two ends of the support assembly 12 can be understood as the ends of the two support rods 121 away from each other.

[0053] In order to enable the first movable end to rotate and vertically slide relative to the upright column 11, in some embodiments, as shown, Figure 1As shown, the column 11 is provided with a first sliding sleeve 14 capable of sliding vertically along the column 11, where the vertical direction can be understood as the length direction of the column 11 or the axial direction; the first movable end of the support assembly 12 is hinged to the first sliding sleeve 14, that is, the support rod 121 is hinged to the first sliding sleeve 14 at one end adjacent to the column 11, so that the first movable end can rotate relative to the column 11, in addition, the first sliding sleeve 14 slides vertically along the column 11 to realize the vertical sliding of the first movable end relative to the column 11.

[0054] In combination with Figure 2 As shown, in the unfolded state of the frame, the mutually hinged ends of the two support rods 121 of the first side frame 1 abut each other, so that the two support rods 121 remain in the unfolded state. Specifically, the two support rods 121 are hingedly connected to each other through a hinged seat, the hinged seat includes two hinged joints 122, the two hinged joints 122 are respectively fixed to the end portions of the two support rods 121, and the end sides of the two hinged joints 122 are hingedly connected to each other. In the unfolded state of the frame, the end sides of the two hinged joints 122 abut each other, thereby limiting the two hinged joints 122 from continuing to flip downward, and further causing the two support rods 121 to remain in the unfolded state.

[0055] The support frame 13 is also arranged between the two columns 11 adjacent in the second direction, specifically, the support frame 13 includes a V-shaped connecting rod, the V-shaped connecting rod includes two connecting rods 131, one end of the two connecting rods 131 are hingedly connected to each other to form a V-shaped connecting rod.

[0056] In combination with

[0057] In addition, in combination with Figure 2 As shown, the middle portions of the two connecting rods 131 are hingedly connected to the two support rods 121 respectively, so that the entire V-shaped connecting rod is in an inverted state; in the unfolded state of the frame, the two connecting rods 131 are arranged to form a triangular support structure at the upper portions of the two support rods 121, which is beneficial to improve the stability of the frame in the unfolded state.

[0058] It is worth noting that when the stroller is in use, as Figure 7 As shown, generally, it is necessary to install a stroller bag 4 on the frame, therefore, in order to support the bag bottom of the stroller bag 4, the frame provided in the embodiment further includes a plurality of flexible support belts 3, the support belts 3 support the bag bottom of the stroller bag 4; in some embodiments, the support belts 3 are preferably flexible fabrics, for example, woven belts, and specifically, fabrics made of polyester fibers, dacron, etc.

[0059] As Figure 3As shown, each support belt 3 is sequentially arranged along the second direction, and the two ends of each support belt 3 are connected to the two support rods 121 opposite along the first direction, wherein the end of the support belt 3 can be directly fixed on the support rod 121, for example, fixed by a buckle, or can be sleeved on the support rod 121, which is not limited here.

[0060] In addition, in the unfolded state, the support belt 3 is tensioned between the two support rods 121 opposite along the first direction. At this time, the belt surface of each support belt 3 corresponds to the support surface formed to support the bag bottom of the car bag 4, wherein the bag bottom of the car bag 4 can be fixed on the support belt 3, for example, sewn on the support belt 3, or directly placed on the support belt 3, which is not limited here. It is worth noting that Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 The support belt 3 is not shown in the above-mentioned embodiments.

[0061] It can be seen that in the present embodiment, the traditional hard frame as the bottom frame to support the bag bottom of the car bag 4 is cancelled, and the flexible support belt 3 is used to support the bag bottom. Compared with the hard frame, the support belt 3 is lighter in weight, thereby being beneficial to reduce the weight of the entire frame, and the support belt 3 is flexible, so as not to interfere with the normal folding of the frame.

[0062] When folding, as shown in Figure 4 , the first side frame 1 is gradually folded along the second direction, and at the same time, the second side frame 2 is gradually folded along the first direction. Since the support belt 3 is flexible, it can naturally bend and deform during the folding process of the first side frame 1 and the second side frame 2, so as to interfere with the normal folding of the entire frame. Finally, the folding of the frame is realized.

[0063] When the frame is unfolded, the two unfolded support rods 121 bear two functions. First, they cooperate with the support frame 13 to support the two upright columns 11 of the same first side frame 1, and second, they bear the weight, that is, the weight of the car bag 4 and the articles in the car bag 4 is transmitted to the support belt 3, and the support belt 3 is supported by the support rod 121, so that the support rod 121 indirectly bears the weight of the car bag 4 and the articles in the car bag 4, that is, bears the weight.

[0064] In order to enable the second side frame 2 to be folded along the first direction, in some embodiments, as shown in Figure 1 , the second side frame 2 is a scissor-type linkage mechanism, which includes one or more groups of X-shaped linkages 21 sequentially hinged along the first direction. For example, in the present embodiment, two groups of X-shaped linkages 21 are used, and the ends of the two X-shaped linkages 21 close to each other are hinged to each other. Specifically:

[0065] The X-shaped link 21 includes two rods 211, which are hinged together at their midpoints to form an X-shaped link structure. This allows the two rods 211 of the X-shaped link 21 to be folded or unfolded along a first direction. It can be seen that each side of the X-shaped link 21 has two ends, one above the other.

[0066] Specifically, in this embodiment, of the two ends of the second side frame 2 on the side adjacent to the column 11, the lower end is hinged to the first sliding sleeve 14 and moves vertically synchronously with the first sliding sleeve 14, while the upper end is hinged to the column 11.

[0067] Example 2

[0068] This embodiment provides another frameless frame, which is essentially an extended version of embodiment 1; specifically:

[0069] like Figure 6 As shown, the frame provided in this embodiment is a foldable frame, which includes two first side frames 1 and two second side frames 2.

[0070] Two first side frames 1 are arranged opposite each other along a first direction, and two second side frames 2 are arranged opposite each other along a second direction and connected between the two first side frames 1. The first direction is perpendicular to the second direction. For example, if the width direction of the frame is considered as the first direction, then the length direction of the frame is the second direction.

[0071] The second side frame 2 is a foldable structure. Specifically, the second side frame 2 can be folded and retracted along the first direction, thereby causing the two first side frames 1 to move closer to each other along the first direction.

[0072] In this embodiment, the two first side frames 1 have basically the same structure, and the two second side frames 2 also have basically the same structure. Therefore, in this embodiment, for ease of explanation, only one of the first side frames 1 and the second side frame 2 will be used as an example for specific explanation.

[0073] like Figure 6 As shown, the first side frame 1 mainly includes two columns 11, a support mechanism, and a support linkage mechanism.

[0074] In the first side frame 1, two columns 11 are arranged sequentially along the second direction, and each column 11 is provided with a roller 111 at its bottom.

[0075] The support mechanism is provided between two adjacent columns 11 along the second direction, specifically:

[0076] The support mechanism includes at least two support components 12 arranged sequentially along a second direction, and uprights 16 disposed between adjacent support components 12, that is, an upright 16 is provided between each pair of adjacent support components 12; in this embodiment, asFigure 6 As shown, the support mechanism comprises two support assemblies 12 and a vertical rod 16. Hereinafter, the specific description is made by taking this as an example:

[0077] The specific structure of the support assembly 12 is that the support assembly 12 comprises two support rods 121, and the two support rods 121 are hingedly connected at one end. In the unfolded state of the vehicle frame, the hingedly connected ends of the two support rods 121 abut each other, for example, the two support rods 121 are hingedly connected through a hinge seat, the hinge seat comprises two hinge joints 122, the two hinge joints 122 are respectively fixed at the end portions of the two support rods 121, and the end side lower portions of the two hinge joints 122 are hingedly connected with each other. In the unfolded state of the vehicle frame, the end sides of the two hinge joints 122 abut each other, thereby limiting the two hinge joints 122 from continuing to turn downward, and further enabling the two support rods 121 to remain in the unfolded state.

[0078] The two ends of the support mechanism constitute first movable ends, and the two first movable ends of the support mechanism are respectively connected to the two vertical columns 11 and can rotate and vertically slide relative to the vertical columns 11. The two ends of the support mechanism are equivalent to the end portions of the support rods 121 adjacent to the vertical columns 11. In order to enable the first movable ends of the support mechanism to rotate and vertically slide relative to the vertical columns 11, in some embodiments, the vertical columns 11 are provided with first sliding sleeves 14 capable of vertically sliding along the vertical columns 11, and the first movable ends of the support mechanism are hingedly connected to the first sliding sleeves 14.

[0079] In addition, the support assembly 12 is connected to the vertical rod 16 at one end adjacent to the vertical rod 16 and can rotate and vertically slide relative to the vertical rod 16. Specifically, the vertical rod 16 is provided with a second sliding sleeve 15 capable of vertically sliding along the vertical rod 16, and the end of the support assembly 12 adjacent to the vertical rod 16 is hingedly connected to the second sliding sleeve 15. Preferably, the end portions of the two support rods 121 located on both sides of the vertical rod 16 are hingedly connected to the same second sliding sleeve 15.

[0080] The specific structure of the support linkage mechanism is that:

[0081] The two ends of the support linkage mechanism are respectively hingedly connected to the two vertical columns 11 at the lower side of the first movable end, that is, the end portions of the support linkage mechanism are located at the lower side of the first sliding sleeve 14 relative to the hinge joints of the vertical columns 11.

[0082] The support linkage mechanism comprises at least two support frames 13 corresponding to the support assemblies 12 one by one, where the one by one correspondence means that one support assembly 12 corresponds to one support frame 13.

[0083] The support frame 13 comprises a V-shaped linkage, and the V-shaped linkage comprises two connecting rods 131, and the two connecting rods 131 are hingedly connected at one end to form a V-shaped linkage.

[0084] In addition, the middle portions of the two connecting rods 131 are respectively hinged to the two support rods 121 of the same support assembly 12 corresponding thereto.

[0085] In addition, each support frame 13 is hinged to the upright rod 16 at one end adjacent to the upright rod 16, and the mutual hinging point of the support frame 13 and the upright rod 16 is located at the lower side of the second sliding sleeve 15.

[0086] In order to be able to support the bag bottom of the car bag 4, as shown in the embodiment, the bicycle frame further comprises a plurality of flexible support belts 3, and the support belts 3 support the bag bottom of the car bag 4. Figure 8 In some embodiments, the support belts 3 are preferably flexible fabrics, such as woven belts, and can be made of polyester fiber, polyester, etc.

[0087] The support belts 3 are sequentially arranged along the second direction, and the two ends of each support belt 3 are respectively connected to the two support rods 121 opposite to each other along the first direction, as shown in the state. Figure 3 In the unfolded state of the bicycle frame, the support belts 3 are tensioned between the two support rods 121 on the opposite sides along the first direction. At this time, each support belt 3 is equivalent to a belt surface, which forms a support surface to support the bag bottom of the car bag 4. The bag bottom of the car bag 4 can be fixed on the support belt 3, such as being sewn on the support belt 3, or can be directly placed on the support belt 3, which is not limited here.

[0088] As can be seen, in the embodiment, the traditional hard frame as the bottom frame to support the bag bottom of the car bag 4 is cancelled, and the flexible support belts 3 are used to support the bag bottom. Compared with the hard frame, the support belts 3 are lighter in weight, thereby being conducive to reducing the weight of the entire bicycle frame, and the support belts 3 are flexible, so as not to interfere with the normal folding of the bicycle frame.

[0089] In the embodiment, the second side frame 2 is a scissor-type linkage structure, which comprises one or more groups of X-shaped linkages 21 sequentially hinged along the first direction, and each X-shaped linkage 21 comprises two rod bodies 211 hinged to each other at the middle portions.

[0090] The second side frame 2 of the embodiment is basically the same as that of the embodiment 1, and the embodiment is equivalent to an extended version of the embodiment 1, that is, the length of the first side frame 1 is extended. In the embodiment, since the length of the first side frame 1 is extended, in order to support the middle portion of the bag opening side of the car bag 4, the upright rod 16 is arranged to support the middle portion.

[0091] Embodiment 3

[0092] This embodiment provides a trolley, which includes a frame and a bag 4, wherein the frame adopts the bottomless trolley provided in Embodiment 1 or Embodiment 2.

[0093] When bag 4 is unfolded, the opening of bag 4 is rectangular.

[0094] like Figure 7 As shown, when the frame is the frame provided in Embodiment 1, the four corners of the bag opening of the bag 4 are fixed to the top of the four uprights 11 respectively; while the bottom of the bag 4 can be placed directly on the support strap 3 or fixed on the support strap 3, which is not specifically limited here.

[0095] like Figure 8 As shown, when the frame is the one provided in Embodiment 2, the four corners of the bag opening of the bag 4 are fixed to the tops of the four uprights 11, and the central area of ​​the bag opening of the bag 4 is fixed to the top of the upright 16 and supported by the upright 16; at this time, the bag opening of the bag 4 is equivalent to being supported by the four uprights 11 and the two uprights 16. The bottom of the bag 4 can be placed directly on the support strap 3 or fixed to the support strap 3, which is not specifically limited here.

[0096] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0097] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0098] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A frameless vehicle chassis, characterized in that, The first side frame comprises two upright columns arranged in sequence along a second direction and provided with rollers at the bottom, the first direction and the second direction are perpendicular to each other, and the first side frame further comprises a support assembly and a support linkage mechanism arranged between the two upright columns; The support assembly comprises two support rods hingedly connected at one end; the two ends of the support assembly constitute first movable ends, are respectively connected to the two upright columns and can rotate and vertically slide relative to the upright columns; The support linkage mechanism comprises a V-shaped linkage, the V-shaped linkage comprises two connection rods hingedly connected at one end; the two ends of the V-shaped linkage are respectively hingedly connected to the two upright columns below the first movable ends, and the middle parts of the two connection rods are respectively hingedly connected to the two support rods; The support belt is a flexible fabric. In the unfolded state of the frame, the support belt is tensioned between the two support rods on the opposite sides along the first direction.

2. The frame of claim 1 wherein, In the unfolded state of the frame, the hingedly connected ends of the two support rods of the first side frame abut each other, so that the two support rods remain in the unfolded state.

3. The frame of claim 2, wherein The first side frame comprises two upright columns arranged in sequence along a second direction and provided with rollers at the bottom, the first direction and the second direction are perpendicular to each other, and the first side frame further comprises a support assembly and a support linkage mechanism arranged between the two upright columns; 4. The frame of claim 1 wherein, The support assembly comprises two support rods hingedly connected at one end; the two ends of the support assembly constitute first movable ends, are respectively connected to the two upright columns and can rotate and vertically slide relative to the upright columns; 5. The no-ledge frame of claim 1, wherein, The support linkage mechanism comprises a V-shaped linkage, the V-shaped linkage comprises two connection rods hingedly connected at one end; the two ends of the V-shaped linkage are respectively hingedly connected to the two upright columns below the first movable ends, and the middle parts of the two connection rods are respectively hingedly connected to the two support rods; 6. A no-ledge frame according to claim 1, wherein The support belt is a flexible fabric.

7. A frameless vehicle, characterized by In the unfolded state of the frame, the support belt is tensioned between the two support rods on the opposite sides along the first direction. In the unfolded state of the frame, the hingedly connected ends of the two support rods of the first side frame abut each other, so that the two support rods remain in the unfolded state. ​ ​ The frame further comprises a plurality of flexible support belts for supporting the bottom of the bag, each of the support belts being arranged in sequence along the second direction, and both ends of each of the support belts being connected to the two support rods opposite to each other along the first direction.

8. The frame of claim 7, wherein, The column is provided with a first sliding sleeve capable of vertically sliding along the column, and the first movable end of the support mechanism is hinged to the first sliding sleeve; and / or the upright rod is provided with a second sliding sleeve capable of vertically sliding along the upright rod, and one end of the support assembly adjacent to the upright rod is hinged to the second sliding sleeve.

9. The frame of claim 8, wherein, The second side frame is a scissor-type link structure, which comprises one or more groups of X-shaped links hinged in sequence along the first direction, and each X-shaped link comprises two rod bodies hinged to each other; among the two end portions of the second side frame close to one side of the column, the lower end portion is hinged to the first sliding sleeve, and the upper end portion is hinged to the column.

10. A cart comprising a frame and a cart bag, characterized in that, The frame adopts the bottomless frame as claimed in any one of claims 1-9.

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