Foldable cart

Abstract

A foldable trolley comprising an end cross tube assembly (1), a side cross tube assembly (2), a bottom frame cross tube assembly (3) and four vertical tubes (4); the adjacent end cross tube assemblies (1) and the side cross tube assemblies (2) are each connected via a vertical tube (4) and the floor frame cross tube assemblies (3) are each connected to four vertical tubes (4); the end cross tube assembly (1), the side cross tube assembly (2) and the floor frame cross tube assembly (3) are foldable so that any two adjacent vertical tubes (4) can be moved closer to or further away from each other; the side cross tube assembly (2) comprises two first cross tubes (21), two first mounting tubes (22) and two second cross tubes (23); the first ends of the two first cross tubes (21) are hingedly connected to one another, the second end of the first cross tube (21) is hingedly connected to the first end of the first mounting tube (22) and the second end of the first mounting tube (22) is correspondingly hingedly connected to the lower part of the vertical tube (4); the first ends of the two second cross tubes (23) are hinged together and the second ends of the second cross tubes (23) are connected to the upper end of the vertical tube (4); the first cross tube (21) and the second cross tube (23) near the same vertical tube (4) are arranged crosswise and the intersection point of the two is rotatably connected.

Description

Technical FieldThe present application relates to the technical field of folding cars, in particular to a folding car.Prior ArtConventional products of folding carriages still take up a large area after folding, which increases transport costs and reduces comfort. The problem of the existing technology is that the connection mechanism used for folding is a single member, so that it is difficult to further optimize the folding effect.The problem of providing a structure for a foldable cart having a strong folding effect and taking a small area after folding must therefore be solved by those skilled in the art.Content of the Utility ModelThe purpose of the present application is to provide a foldable cart with a high degree of foldability, a small volume after folding, and a sufficient volume after unfolding.To achieve the above-mentioned purpose, the present application provides a foldable cart, comprising: an end cross tube assembly, a side cross tube assembly, a bottom frame cross tube assembly, and four vertical tubes; adjacent end cross tube assemblies and side cross tube assemblies are each connected by one vertical tube, and the bottom frame cross tube assembly is each connected to the four vertical tubes; the end cross tube assembly, the side cross tube assembly, and the bottom frame cross tube assembly may all be folded such that any two adjacent vertical tubes are close to and spaced from each other; the side cross tube assembly comprises: two first cross tubes, two first mounting tubes, and two second cross tubes; the first ends of the two first transverse tubes are hinged together, the second ends of the first transverse tubes are hinged together with the first ends of the first mounting tubes, and the second ends of the first mounting tubes are hinged together with the lower parts of the vertical tubes, respectively; the first ends of the two second transverse tubes are hinged together and the second ends of the second transverse tubes are connected together with the upper ends of the vertical tubes; the first transverse tubes and the second transverse tubes, which are located near the same vertical tube, are arranged crosswise and the intersection of the two is rotatably connected.In some embodiments, the side cross tube assembly further comprises: two second mounting tubes; the first end of the second mounting tube is slidably connected to the vertical tube via a slider; and the second end of the second mounting tube is correspondingly hingedly connected to the second cross tube.In some embodiments, the end-to-cross tube assembly includes: two third cross tubes and two fourth cross tubes; the first ends of the two third cross tubes are hingedly connected to each other and the second ends of the two third cross tubes are connected to respective sliders; the first ends of the two fourth cross tubes are hingedly connected to each other and the second ends of the fourth cross tubes are respectively connected to the upper ends of the two vertical tubes; the third cross tube and the fourth cross tube connected to the same vertical tube are crosswise arranged and the two are rotatably connected at the intersection.In some embodiments, the floor frame cross tube assembly includes: four first base tubes, four second base tubes, two bi-directional joint seats, and two four-way joint seats; the bi-directional joint seat is connected to the first end side of the second cross tube, each bi-directional joint seat is articulated to two first base tubes, and each bi-directional joint seat is respectively connected to two four-way joint seats through the first base tube; the four second base tubes are respectively connected to the lower ends of the four vertical tubes, and the two second base tubes of the cross tube assembly near the same end surface are connected to the same four-way joint seat.In some embodiments, the floor frame cross tube assembly includes: four third base tubes and a four-way joint seat; the four third base tubes are respectively connected to the lower ends of the four vertical tubes, and the four third base tubes are all connected to the same four-way joint seat.In some embodiments, the end cross tube assembly includes: two fifth cross tubes and two third mounting tubes; the middle portions of the two fifth cross tubes are rotatably connected, the first ends of the two fifth cross tubes are respectively connected to the upper ends of the two vertical tubes, the second ends of the two fifth cross tubes are respectively connected to the first ends of the two third mounting tubes, and the second ends of the two third mounting tubes are respectively connected to the sides of the two vertical tubes.In some embodiments, a movable roller is provided at the lower end of each vertical tube.In some embodiments, a folding rod is provided between two vertical tubes corresponding to the end cross tube assembly. The folding rod can be folded according to the relative movement of the vertical tubes and a handle assembly is mounted on the folding rod.In comparison with the above prior art, the present application is provided with an end cross tube assembly, a side cross tube assembly, a floor frame cross tube assembly, and four vertical tubes; the adjacent end cross tube assemblies and the side cross tube assemblies are each connected by one vertical tube. The floor frame cross tube assembly is connected to four vertical tubes, respectively. The end cross tube assembly, the side cross tube assembly, and the bottom frame cross tube assembly may all be folded such that two adjacent vertical tubes may be close to and spaced apart from each other. The side cross tube assembly comprises: two first cross tubes, two first mounting tubes, and two second cross tubes; the first ends of the first cross tubes are hingedly connected together, the second ends of the first cross tubes are hingedly connected to the first ends of the first mounting tubes, and the second ends of the first mounting tubes are hingedly connected to the vertical tubes; the first ends of the two second cross tubes are hingedly connected together, and the second ends of the second cross tubes are connected to the upper ends of the vertical tubes. The first transverse tubes and the second transverse tubes in the vicinity of the same vertical tube are arranged crosswise. When the folding cart is opened, the structure of the cross tubes can stably support the main body of the folding cart; when the folding cart is folded, the hinge position of the first cross tube and the first mounting tube moves downward, thereby reducing the volume after the folding.Brief Description of the DrawingsIn order to better illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments or the description of the prior art are briefly presented below. Of course, the drawings described below are only embodiments of the present application. Those skilled in the art can make other drawings based on the drawings provided without inventive skill. FIG. 1 is a schematic structural diagram of a foldable cart in a first embodiment of the present application; FIG. 2 is a side view of the foldable cart in the first embodiment of the present application; FIG. 3 is a plan view of the folding carriage in the first embodiment of the present application; FIG. 4 is a schematic structural diagram of the foldable cart in the folded state according to the first embodiment of the present application; FIG. 5 shows a side view of FIG. 4 ; FIG. 6 is a side view of the foldable cart in the first embodiment of the present application after being fully folded; FIG. 7 is a side view of the bottom frame cross tube assembly in the first embodiment of the present application in a folded state; FIG. 8 is a side view of the bottom frame cross tube assembly in the first embodiment of the present application when fully folded; FIG. 9 is a schematic structural diagram of a foldable cart in a second embodiment of the present application; FIG. 10 is a schematic structural diagram of the foldable cart in the folded state according to the second embodiment of the present application; FIG. 11 shows a top view of a folding carriage in a second embodiment of the present application; FIG. 12 is a side view of a foldable cart in a second embodiment of the present application; FIG. 13 is a front view of a foldable carriage in a third embodiment of the present application; FIG. 14 is a front view of a foldable cart in a fourth embodiment of the present application.Among them, 1-end cross tube assembly, 11-third cross tube, 12-fourth cross tube, 13-fifth cross tube, 14-third mounting tube; 2-side cross tube assembly, 21-first cross tube, 22-first mounting tube, 23-second cross tube, 24-second mounting tube; 3-bottom frame cross tube assembly, 31-first base tube, 32-second base tube, 33-two-way joint seat, 34-four-way joint seat, 35-third base tube; 4-vertical tube, 5-slider, 6-movable roller, 7-folding rod, 8-handle assembly.ReactionThe following embodiments are combined with the drawings in the embodiments of the present application to clearly and fully describe the technical solutions in the embodiments of the present application. Of course, the described embodiments are only a part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments generated by those skilled in the art without inventive power fall within the scope of the present application.For a better understanding of the solution of the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific implementation methods.Referring to FIGS. 1 to 8 of the specification, FIG. 1 is a schematic structural diagram of the foldable cart in the first embodiment of the present application, FIG. 2 is a side view of the foldable cart in the first embodiment of the present application, FIG. 3 is a plan view of the foldable cart in the first embodiment of the present application, FIG. 4 is a schematic structural diagram of the foldable cart in the folded state in the first embodiment of the present application, FIG. 5 is a side view of FIG. 4, FIG. 6 is a side view of the foldable cart in the first embodiment of the present application after being fully folded, FIG. 7 is a side view of the floor frame cross tube assembly in the first embodiment of the present application in the folded state, and FIG. 8 is a side view of the floor frame cross tube assembly in the first embodiment of the present application when fully folded, comprising: an end cross tube assembly 1, a side cross tube assembly 2, a floor frame cross tube assembly 3, and four vertical tubes 4; The four vertical tubes 4 are distributed in a rectangular shape, i.e., there are two adjacent vertical tubes 4 on the side of each vertical tube 4, and the sides of the two adjacent vertical tubes 4 are connected by one end cross tube assembly 1 or one side cross tube assembly 2, i.e., the adjacent end cross tube groups 1 and the side cross tube assemblies 2 are each connected by one vertical tube 4. The side cross tube assembly 2 forms the long side of the rectangular structure and the end cross tube assembly 1 forms the short side of the rectangular structure, so that the four vertical tubes 4 are connected one after another to form the side frame of the foldable cart. The floor frame cross tube assembly 3 is connected to the lower parts of the four vertical tubes 4, respectively, to form the floor frame of the foldable cart.The end cross tube assembly 1, the side cross tube assembly 2 and the bottom frame cross tube assembly 3 can all be folded so that two adjacent vertical tubes 4 can be moved closer to each other or further away from each other. When the folding cart is opened, the cross tube structure can stably support the main body of the folding cart; when the folding cart is folded, the cross tube structure can be folded to achieve rapid folding between the vertical tubes 4 and reduce the volume of the main body after folding.The side cross tube assembly 2 comprises: two first cross tubes 21, two first mounting tubes 22 and two second cross tubes 23; the first ends of the two first cross tubes 21 are hingedly connected to each other and the second end of each first cross tube 21 is hingedly connected to the first end of the corresponding first mounting tube 22 and the second end of the first mounting tube 22 is hingedly connected to the lower part of the corresponding vertical tube 4; the first ends of the two second cross tubes 23 are hingedly connected to each other and the second end of each second cross tube 23 is rigidly connected to the upper side of the corresponding vertical tube 4. The first cross tube 21 and the second cross tube 23 near the same vertical tube 4 are arranged crosswise and the intersection point is rotatably connected, thereby forming two intersections in the side cross tube assembly 2 forming two X-shaped cross mechanisms.When the two vertical pipes 4 connected to the side cross pipe assembly 2 are close to each other, the second end of the second cross pipe 23 is fixedly connected to the vertical pipe 4, and with the two intersection points as axes, the two second cross pipes 23 are close to each other, and the hinge points of the first ends are moved downward, the two first cross pipes 21 are close to each other, and the hinge points of the first ends are raised, and the second ends of the first cross pipes 21 are hinged to the vertical pipe 4 via the first mounting pipe 22, and the hinge position of the first cross pipe 21 and the first mounting pipe 22 is moved downward. Since the lower part of the foldable carriage has sufficient movement margin, the folding effect of the side cross tube assembly 2 is enhanced, thereby reducing the volume after folding.When the two vertical tubes 4 connected by the side cross tube assembly 2 move away from each other, the above-mentioned structures move in the opposite direction. The principle of the movement is the same as above and is not repeated.The side cross tube assembly 2 further comprises: two second mounting tubes 24; the first ends of the second mounting tubes 24 are slidably connected to the vertical tube 4 via the slider 5; the slider 5 can slide along the longitudinal direction of the vertical tube 4; and the second ends of the second mounting tubes 24 are hinged to the corresponding second cross tubes 23. The cooperation between the second mounting tubes 24 and the slider 5 increases the stability of the folded structure.When the two vertical pipes 4 connected to the side cross pipe assembly 2 are close to each other, the second end of the second cross pipe 23 is fixedly connected to the vertical pipe 4 and the two crossing points serve as axes. The two second cross tubes 23 are close to each other and the hinge point of the first end is moved downward and the second mounting tube 24 is hinged to the slider 5 and the second cross tube 23 to obtain a folding space between the second cross tube 23 and the vertical tube 4. At the same time, the two first transverse tubes 21 are close to each other and the hinge point of the first end is raised and the second end of the first transverse tube 21 is hinged to the vertical tube 4 via the first mounting tube 22 to obtain a folding space.When the two vertical tubes 4 connected by the side cross tube assembly 2 move away from each other, the above-mentioned structures move in the opposite direction. The principle of the movement is the same as above and is not repeated.In addition, the above-mentioned end-cross tube assembly 1 includes: two third cross tubes 11 and two fourth cross tubes 12; the first ends of the two third cross tubes 11 are jointedly connected to each other and the second ends of the two third cross tubes 11 are respectively connected to the corresponding two spools 5; the first ends of the two fourth cross tubes 12 are jointedly connected to each other and the second ends of the fourth cross tubes 12 are respectively connected to the upper ends of the two vertical tubes 4; and the third cross tube 11 and the fourth cross tube 12 connected to the same vertical tube 4 are arranged crosswise and the intersection of the two is rotatably connected to form two intersections in the end-cross tube assembly 1.When the two vertical pipes 4 connected by the end-cross pipe assembly 1 approach each other, the second end of the third cross pipe 11 is fixedly connected to the vertical pipe 4, and with the two intersection points as axes, the two third cross pipes 11 approach each other and raise the hinge points of the first ends, and the two fourth cross pipes 12 approach each other and move the hinge points of the first ends downward, and the slider 5 at the second end of the fourth cross pipe 12 moves downward along the surface of the vertical pipe 4 to obtain space for folding and moving.When the two vertical tubes 4 connected by the end cross tube assembly 1 move away from each other, the above-mentioned structures move in the opposite direction. The principle of the movement is the same as above and is not repeated.Further, referring to the accompanying drawings 9 to 12 of the specification, FIG. 9 is a schematic structural diagram of the foldable cart in the second embodiment of the present application, FIG. 10 is a schematic structural diagram of the foldable cart in the folded state in the second embodiment of the present application, FIG. 11 is a plan view of the foldable cart in the second embodiment of the present application, and FIG. 12 is a side view of the foldable cart in the second embodiment of the present application including the above-mentioned floor frame cross tube assembly 3 including: four first base tubes 31, four second base tubes 32, two bidirectional hinge seats 33, and two four-way hinge seats 34; the bidirectional joint seats 33 are connected to the first end side of the second cross pipe 23 and rise and fall synchronously with the first end of the second cross pipe 23, each bidirectional joint seat 33 is articulated to two first base pipes 31, and each bidirectional joint seat 33 is connected to two four-way joint seats 34 via the first base pipe 31, respectively, that is, the two first base pipes 31 connected to the bidirectional joint seat 33 are connected to two different four-way joint seats 34, respectively. The four first base pipes 31 are connected to each other to form a diamond structure with the two-way joint seat 33 and the four-way joint seat 34 as the four end points. The four second base pipes 32 are respectively connected to the lower ends of the four vertical pipes 4, and the two second base pipes 32 in the vicinity of the same end cross pipe assembly 1 are connected to the same four-way joint seat 34.The above-mentioned hinge seat structure can be realized by the plastic part of the bottom frame and the soft surface fabric, and can be easily moved by the cross tube structure when the folding cart is folded. In one embodiment of the present application, the two-way joint seat 33 as a driving position follows the first end of the second cross tube 23 to move downward, and the first base tube 31 is folded upward, respectively, to lift the four-way joint seat 34 to realize the folding of the floor frame cross tube assembly 3. When the floor frame cross tube assembly 3 is deployed, the above structures move in the opposite direction and the principle of movement is the same as above, which is not repeated.Moreover, the above-mentioned floor frame cross pipe assembly 3: includes four third base pipes 35 and a four-way joint seat 34; the four third base pipes 35 are respectively connected to the lower ends of the four vertical pipes 4; and the four third base pipes 35 are all connected to the same four-way joint seat 34. The four-way joint seat 34 at the center is directly lifted from the four third base tubes 35 to realize the folding of the floor frame.Further, referring to the accompanying drawings 13 and 14 of the specification, FIG. 13 is a front view of the foldable cart in the third embodiment of the present application and FIG. 14 is a front view of the foldable cart in the fourth embodiment of the present application, including: the end cross tube assembly 1 including: two fifth cross tubes 13 and two third mounting tubes 14; the middle parts of the two fifth cross tubes 13 are rotatably connected to form an intersection point. The first ends of the two fifth cross tubes 13 are connected to the upper ends of the two vertical tubes 4, respectively, the second ends of the two fifth cross tubes 13 are connected to the first ends of the two third mounting tubes 14, respectively, and the second ends of the two third mounting tubes 14 are connected to the sides of the two vertical tubes 4, respectively.FIG. 13 shows the structure of the end cross pipe assembly 1 cooperating with the bottom frame cross pipe assembly 3 of the first embodiment, and FIG. 14 shows the structure of the end cross pipe assembly 1 cooperating with the bottom frame cross pipe assembly 3 of the second embodiment.Moreover, a movable roller 6 is provided at the lower end of each vertical tube 4, and the movable roller 6 can realize the movement of the folding carriage frame and the relative movement between a plurality of vertical tubes 4.Moreover, between the two vertical tubes 4 corresponding to the end cross tube assembly 1, a folding rod 7 is provided and a handle assembly 8 is supported on the folding rod 7. The handle assembly 8 is used for pulling the foldable carriage, and the folding rod 7 and one of the end cross tube assemblies 1 are arranged in the same vertical plane, and the middle part of the folding rod 7 can be bent by the relative movement between the vertical tubes 4 to achieve a folding effect. The specific structure of the folding rod 7 can be gathered from the prior art and is not explained here in any further detail.It should be noted that in this specification relational terms such as first and second are used only to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

Claims

A foldable cart comprising an end cross tube assembly (1), a side cross tube assembly (2), a bottom frame cross tube assembly (3) and four vertical tubes (4); the adjacent end cross tube assemblies (1) and the side cross tube assemblies (2) are each connected via a vertical tube (4) and the bottom frame cross tube assemblies (3) are each connected to four vertical tubes (4); the end cross tube assembly (1), the side cross tube assembly (2) and the bottom frame cross tube assembly (3) are foldable such that any two adjacent vertical tubes (4) are movable closer to each other or further away from each other; the lateral transverse tube assembly (2) comprises two first transverse tubes (21), two first mounting tubes (22) and two second transverse tubes (23); the first ends of the two first transverse tubes (21) are hingedly connected to each other, the second end of the first transverse tube (21) is hingedly connected to the first end of the first mounting tube (22) and the second end of the first mounting tube (22) is respectively hingedly connected to the lower part of the vertical tube (4); the first ends of the two second transverse tubes (23) are hingedly connected to each other and the second ends of the second transverse tubes (23) are connected to the upper end of the vertical tube (4); the first transverse tube (21) and the second transverse tube (23) near the same vertical tube (4) are arranged crosswise and the intersection of the two is pivotally connected.The folding cart according to claim 1, characterized in that said lateral transverse tube assembly (2) further comprises two second mounting tubes (24); said first end of said second mounting tube (24) is slidably connected to said vertical tube (4) via a slider (5) and said second end of said second mounting tube (24) is correspondingly hinged to said second transverse tube (23).The folding cart according to claim 2, characterized in that the end-cross-tube assembly (1) comprises two third cross-tubes (11) and two fourth cross-tubes (12); the first ends of the two third cross-tubes (11) are hingedly connected to each other and the second ends of the two third cross-tubes (11) are connected to the respective sliders (5); the first ends of the two fourth cross-tubes (12) are hingedly connected to each other and the second ends of the fourth cross-tubes (12) are respectively connected to the upper ends of the two vertical tubes (4); the third cross-tube (11) and the fourth cross-tube (12) connected to the same vertical tube (4) are crosswise arranged and the intersection of the two is pivotally connected.The folding cart according to claim 3, characterized in that the floor frame cross tube assembly (3) comprises four first base tubes (31), four second base tubes (32), two bidirectional joint seats (33), and two four-way joint seats (34); the bidirectional joint seat (33) is connected to the side surface of the first end of the second cross tube (23), each bidirectional joint seat (33) is hingedly connected to two of the first base tubes (31), and each bidirectional joint seat (33) is respectively connected to two of the four-way joint seats (34) through the first base tubes (31); the four second base pipes (32) are respectively connected to the lower ends of the four vertical pipes (4) and the two second base pipes (32) located near the same end cross pipe assembly (1) are connected to the same four-way joint seat (34).The folding cart according to claim 1, characterized in that the floor frame cross tube assembly (3) comprises four third base tubes (35) and a four-way joint seat (34); the four third base tubes (35) are respectively connected to the lower ends of the four vertical tubes (4) and the four third base tubes (35) are all connected to the same four-way joint seat (34).The folding cart according to claim 1, characterized in that the end cross tube assembly (1) comprises two fifth cross tubes (13) and two third mounting tubes (14); the middle parts of the two fifth cross tubes (13) are rotatably connected, the first ends of the two fifth cross tubes (13) are respectively connected to the upper ends of the two vertical tubes (4), the second ends of the two fifth cross tubes (13) are respectively connected to the first ends of the two third mounting tubes (14), and the second ends of the two third mounting tubes (14) are respectively connected to the side surfaces of the two vertical tubes (4).Folding trolley according to any one of claims 1 to 6, characterised in that at the lower end of each vertical tube (4) a movable roller (6) is provided accordingly.Foldable cart according to any of claims 1 to 6, characterized in that between the two vertical tubes (4) corresponding to the end cross tube assembly (1) a folding rod (7) is provided and the folding rod (7) can be folded following the relative movement of the vertical tubes (4) and a handle assembly (8) is provided on the folding rod (7).

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