Foldable cart

Abstract

A foldable trolley comprising a front frame (1) and a rear frame (2) arranged front-rear, and a side frame (3) arranged therebetween for unfolding and folding, wherein the side frame (3) has a front upper bar (31), a front lower bar (32), a rear upper bar (33) and a rear lower bar (34), front ends of the front upper bar (31) and the front lower bar (32) are hinged to an upper side and a lower side, respectively, of the front frame (1), rear ends of the rear upper bar (33) and the rear lower bar (34) are hinged to an upper side and a lower side, respectively.a bottom side of the rear frame (2), a rear side of the front upper bar (31) is hinged to a front side of the rear upper bar (33), and a rear side of the front lower bar (32) is hinged to a front side of the rear lower bar (34); characterized in that the side frame (3) further comprises a front oblique bar (35) and a rear oblique bar (36); an upper end of the front oblique bar (35) is hinged between the front upper bar (31) and the rear upper bar (33), and a lower end thereof is slidably connected to the front frame (1) or the front lower bar (32); and an upper end of the rear oblique bar (36) is hinged between the front upper bar (31) and the rear upper bar (33), and a lower end thereof is slidably connected to the rear frame (2) or the rear lower bar (34).

Description

Technical FieldThe present invention relates to the technical field of cars, and more particularly to a foldable car.Prior ArtFolding cars are preferred by consumers because they are foldable and easy to transport and store. However, the foldable construction inevitably leads to the structural strength being lower than in the case of rigidly connected cars. The patent (No. CN216374594U), for example, discloses a foldable cart comprising a lower beam, at least two groups of side supports, and a plurality of support rods. The plurality of support rods are vertically disposed and located at an edge of the foldable cart, and the lower support is movably connected to the support rods. The structural strength and stability of the lateral supports of the foldable carriage is low. It is of great importance to improve the structural strength and load-bearing capacity of the foldable cart in order to satisfy the consumer usage requirements to the greatest extent.Content of the Utility ModelAgainst the technical problems of poor structural strength and stability of an existing folding cart, the present application provides a folding cart that improves overall structural strength and folding stability of a side frame and meets users' use requirements to the greatest extent.In the present application, the following technical solutions are used:A folding cart includes a front frame and a rear frame disposed front-rear, and a side frame for unfolding and collapsing disposed therebetween, wherein the side frame includes a front upper rod, a front lower rod, a rear upper rod, and a rear lower rod, front ends of the front upper rod and the front lower rod are hinged to an upper side and a lower side of the front frame, rear ends of the rear upper rod and the rear lower rod are hinged to an upper side and a lower side of the rear frame, respectively, a rear side of the front upper rod is hinged to a front side of the rear upper rod, and a rear side of the front lower rod is hinged to a front side of the rear lower rod; the side frame further includes a front tilt rod and a rear tilt rod; an upper end of the front tilt rod is hinged between the front upper rod and the rear upper rod, and a lower end thereof is slidably connected to the front frame or the front lower rod; and an upper end of the rear tilt rod is hinged between the front upper rod and the rear upper rod, and a lower end thereof is slidably connected to the rear frame or the rear lower rod.In the foldable cart described above, the side frame further includes a front support rod and a rear support rod.An upper end of the front support rod is hinged to a central portion of the front tilt rod, and a lower end thereof is slidably connected to the front lower rod; and an upper end of the rear support rod is hinged to a central portion of the rear tilt rod, and a lower end thereof is slidably connected to the rear lower rod.In the above-described foldable cart, the foldable cart further includes an upper hinge bearing disposed between the front upper rod and the rear upper rod, wherein a front end of the upper hinge bearing is hinged to a rear end of the front upper rod, a rear end of the upper hinge bearing is hinged to a front end of the rear upper rod, and the upper ends of the front tilt rod and the rear tilt rod are each hinged to the upper hinge bearing.In the above-described foldable cart, a link is disposed at a lower side of the upper hinge bearing, and the upper hinge bearing is hinged to the upper ends of the front tilt bar and the rear tilt bar via the link.In the above-described foldable cart, the link member is inverted T-shaped, a front end of the link member is hinged to an upper end of the front tilt bar, and a rear end thereof is hinged to an upper end of the rear upper bar.In the above-described foldable cart, the upper ends of the front tilt bar and the rear tilt bar are sequentially hinged to a central portion of the upper hinge bearing.In the above-described foldable cart, when the foldable cart is folded from an unfolded state to a folded state, the upper ends of the front tilt rod and the rear tilt rod are rotated about a hinge so that the ends away from the hinge gradually approach in the downward direction.In the above-described foldable cart, the upper ends of the front tilt bar and the rear tilt bar are rotated about a hinge when the foldable cart is unfolded from a folded state to an unfolded state, so that the ends close to the hinge gradually move upward.In the above-described foldable cart, the front upper rod, the rear upper rod, and the upper hinge bearing are all arranged transversely in a folded state of the foldable cart, the front upper rod and the rear upper rod are arranged vertically in folding the foldable cart from a folded state to a folded state, and the upper hinge bearing is held arranged transversely.In the above-described foldable cart, a front shoe is hinged to a lower end of the front tilt rod, and the front shoe is sheathed on the front lower rod and slidable along the front lower rod; and a rear shoe is hinged to a lower end of the rear tilt rod, and the rear shoe is sheathed on the rear lower rod and slidable along the rear lower rod.In the above-described folding cart and in a folded-up state of the folding cart, the front support rod is vertically connected between the front tilt rod and the front lower rod, and the rear support rod is vertically connected between the rear tilt rod and the rear lower rod.The embodiments of the present invention have the following advantageous effects.In the present application, a foldable cart is shown. Inclined rods are interposed between the upper rods and the lower rods, so that a supporting force between the upper rods and the lower rods can be increased. The inclined rods are slidably connected to the lower rods or a frame, so that the stability of the folding deformation is improved. According to the present application, the overall structural strength and folding stability of a side frame are improved, and the use requirements of users can be highly satisfied.Brief Description of the DrawingsIn order to more clearly describe the technical solutions in the embodiments of the present application, the following briefly discusses the attached drawings required for the description of the embodiments. The appended drawings in the following description show only some embodiments of the present application, and those skilled in the art can derive still other drawings from the appended drawings without any need for any drawing. FIG. 1 is a schematic structural diagram of a folding cart in a deployed state according to Embodiment 1 of the present application; FIG. 2 is a schematic structural diagram of the folding cart in a folded state according to Embodiment 1 of the present application; FIG. 3 is a schematic structural diagram of a folding cart in a deployed state according to Embodiment 2 of the present application; FIG. 4 is a schematic structural diagram of the folding cart in a folded state according to Embodiment 2 of the present application; FIG. 5 is a schematic structural diagram of a folding cart in a deployed state according to Embodiment 3 of the present application; FIG. 6 is a schematic structural diagram of the folding cart in a folded state according to Embodiment 3 of the present application; FIG. 7 is a schematic structural diagram of a folding cart in a deployed state according to Embodiment 4 of the present application; FIG. 8 is a schematic structural diagram of a folding cart in a deployed state according to Embodiment 5 of the present application; FIG. 9 is a schematic structural diagram of a folding cart in a deployed state according to Embodiment 6 of the present application; and FIG. 10 is a schematic structural diagram of a folding cart in a deployed state according to Embodiment 7 of the present application.Detailed DescriptionThe technical solutions of the embodiments of the present invention will be clearly and fully described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described are only a few, not all, embodiments of the present invention. All other embodiments which the person skilled in the art obtains on the basis of the embodiments of the present invention without any user effort fall within the scope of protection of the present invention.As shown in Figs. 1 to 10, a folding cart comprises a front frame 1 and a rear frame 2 disposed forwardly and rearwardly, and a side frame 3 for unfolding and folding interposed therebetween. The side frame 3 includes a front upper rod 31, a front lower rod 32, a rear upper rod 33, and a rear lower rod 34. The rear ends of the rear upper rod 33 and the rear lower rod 34 are hinged to upper and lower sides of the rear frame 2, respectively. A rear side of the front upper rod 31 is hinged to a front side of the rear upper rod 33. A rear side of the front lower rod 32 is hinged to a front side of the rear lower rod 34. The side frame 3 further includes a front tilt bar 35 and a rear tilt bar 36.An upper end of the front tilt rod 35 is hinged between the front upper rod 31 and the rear upper rod 33, and a lower end thereof is slidably connected to the front frame 1 or the front lower rod 32.An upper end of the rear tilt rod 36 is hinged between the front upper rod 31 and the rear upper rod 33, and a lower end thereof is slidably connected to the rear frame 2 or the rear lower rod 34.In the present application, a foldable cart is shown. Inclined rods are interposed between the upper rods and the lower rods, so that a supporting force between the upper rods and the lower rods can be increased. The inclined rods are slidably connected to the lower rods or a frame, so that the stability of the folding deformation is improved. According to the present application, the overall structural strength and folding stability of a side frame are improved, and the use requirements of users can be highly satisfied.In addition, the side frame 3 includes a front support rod 3 aand a rear support rod 3 b.An upper end of the front support rod 3a is hinged to a central portion of the front tilt rod 35, and a lower end thereof is slidably connected to the front lower rod 32.An upper end of the rear support rod 3 bis hinged to a central portion of the rear tilt rod 36, and a lower end thereof is slidably connected to the rear lower rod 34.The folding cart further comprises an upper hinge bearing 37 disposed between the front upper rod 31 and the rear upper rod 33. A front end of the upper hinge bearing 37 is hinged to a rear end of the front upper rod 31. A rear end of the upper hinge bearing 37 is hinged to a front end of the rear upper rod 33. The upper ends of the front tilt bar 35 and the rear tilt bar 36 are hinged to the upper hinge bearing 37. According to the present application, the front upper rod 31 is hinged to the rear upper rod 33 via the upper hinge bearing 37, which facilitates collapsing. Preferably, the cross section of the upper hinge bearing 37 is inverted n-shaped, and front and rear sides of the upper hinge bearing are sheathed at the end portions of the front upper rod 31 and the rear upper rod 33, respectively, so that the hinge is more stable. The foldable cart can be transversely held in the unfolded state, whereby the overall structural strength is improved. The upper ends of the front tilt bar 35 and the rear tilt bar 36 are hinged to the upper hinge bearing 37, so that in the unfolded state of the foldable cart, the front tilt bar 35 and the rear tilt bar 36 are relatively tilted, thereby improving the overall structural strength of the side frame.In a preferred embodiment related to Embodiment 1 of Figs. 1 to 2 of the present application, an upper end of the front tilt rod 35 is hinged between the front upper rod 31 and the rear upper rod 33, and a lower end thereof is slidably connected to the front lower rod 32; and an upper end of the rear tilt rod 36 is hinged between the front upper rod 31 and the rear upper rod 33, and a lower end thereof is slidably connected to the rear lower rod 34.In a preferred embodiment related to embodiment 2 of Figs. 3 to 4 of the present application, a connecting member 38 is disposed on an underside of the upper hinge bearing 37, and more preferably, the connecting member 38 is inversely T-shaped. A front end of the link member 38 is hinged to the upper end of the front tilt rod 35, and a rear end thereof is hinged to the upper end of the rear upper rod 33. The structure of this construction is reasonable, and the front tilt rod 35 and the rear tilt rod 36 smoothly rotate upon folding, thereby achieving high folding stability.In another preferred embodiment related to Embodiment 3 of Figs. 5 to 6 of the present application, the upper ends of the front tilt bar 35 and the rear tilt bar 36 are sequentially hinged to a central portion of the upper hinge bearing 37. The upper ends of the front tilt rod 35 and the rear tilt rod 36 are located between the front upper rod 31 and the rear upper rod 33 in the present application.In another preferred embodiment related to Embodiment 4 of FIG. 7 of the present application, the lower ends of the front tilt bar 35 and the rear tilt bar 36 are slidably connected to the front frame 1 and the rear frame 2, respectively, and the upper ends of the front tilt bar 35 and the rear tilt bar 36 are located between the front upper bar 31 and the rear upper bar 33 in the present application.In another preferred embodiment related to Embodiment 5 of FIG. 8 of the present application, the lower ends of the front tilt bar 35 and the rear tilt bar 36 are slidably connected to the front frame 1 and the rear frame 2, respectively, and an upper end of the front support bar 3 ais hinged to a central portion of the front tilt bar 35, and a lower end thereof is slidably connected to the front lower bar 32; and an upper end of the rear support bar 3 bis hinged to a central portion of the rear tilt bar 36, and a lower end thereof is slidably connected to the rear lower bar 34. This structure in the present application is simple and convenient to fold and can support the upper rods and the lower rods in the unfolded state, thereby improving the overall structural strength of the foldable cart.Further, when folding the foldable cart from an unfolded state to a folded state, the upper ends of the front tilt bar 35 and the rear tilt bar 36 are rotated around a hinge so that the ends away from the hinge gradually approach downward direction. Conversely, when the folding cart is unfolded from a folded state to an unfolded state, the upper ends of the front tilt bar 35 and the rear tilt bar 36 are rotated around a hinge so that the ends close to the hinge gradually move upward. This structure is convenient to fold, improves the overall structural strength and folding stability of the side frame, and can satisfy the user's use requirements to the greatest extent.Further, in the unfolded state of the folding cart, the front upper rod 31, the rear upper rod 33, and the upper hinge bearing 37 are all arranged transversely. The front upper rod 31 and the rear upper rod 33 are vertically arranged when the folding carriage is folded from an unfolded state to a folded state, and the upper hinge bearing 37 is held transversely arranged. This structure improves the folding stability of the foldable cart.In a preferred embodiment, a front shoe 351 is hinged to a lower end of the front tilt rod 35, and the front shoe 351 is sheathed on the front lower rod 32 and slidable along the front lower rod 32. By the arrangement of the front shoe 351, the front tilt rod 35 can be slid in the longitudinal direction of the front lower rod 32, thereby improving the stability of the folding deformation. Of course, such a sliding method for the slide shoe may be selected between the lower end of the front support rod 3a and the front lower rod 32, or a sliding groove may be provided on the front lower rod 32, and a sliding portion slidable along the sliding groove may be provided on the lower side of the front support rod 3a. In this way, the purpose of slidably folding the front support rod 3a in the longitudinal direction of the front lower rod 32 can also be achieved, thereby improving the stability of the folding deformation.In a preferred embodiment, a rear shoe 361 is hinged to a lower end of the rear tilt bar 36, and the rear shoe 361 is sheathed on the rear lower bar 34 and may be slidable along the rear lower bar. By the arrangement of the rear shoe 361, the rear tilt rod 36 can be slidable in a longitudinal direction of the rear lower rod 34, thereby improving the stability of the folding deformation. Of course, such a sliding method for the slide shoe may be selected between the lower end of the rear support rod 3 band the rear lower rod 34, or a sliding groove may be provided on the rear lower rod 34, and a sliding portion slidable along the sliding groove may be provided on the lower side of the rear support rod 3 b. In this way, the purpose of slidably folding the rear support rod 3b in the longitudinal direction of the rear lower rod 34 can also be achieved, thereby improving the stability of the folding deformation.Preferably, as shown in FIGS. 1 and 3, in the unfolded state of the foldable cart, the front support rod 3 ais vertically connected between the front tilt rod 35 and the front lower rod 32, and the rear support rod 3 bis vertically connected between the rear tilt rod 36 and the rear lower rod 34. When the folding cart is unfolded, the front support bar 3 aand the rear support bar 3 bare vertically disposed, so that the support force for supporting the front tilt bar 35 and the rear tilt bar 36 in the vertical state can be improved, thereby further improving the overall structural strength of the side frame.In another preferred embodiment, a rear end of the front lower rod 32 is hinged to the front of the rear lower rod 34, and the front of the rear lower rod 34 abuts an upper side surface of the front lower rod 32 in a folded-up state of the folding cart. With this construction, in the folded-up state of the folding cart, the front lower bar 32 and the rear lower bar 34 can be arranged at the same height in the transverse direction, thereby improving the overall structural strength of the side frame.In a preferred embodiment related to Embodiment 6 of FIG. 9 of the present application, an upper end of the front tilt rod 35 is hinged between the front upper rod 31 and the rear upper rod 33, and a lower end thereof is slidably connected to the front lower rod 32.In a preferred embodiment related to Embodiment 7 of FIG. 10 of the present application, an upper end of the rear tilt rod 36 is hinged between the front upper rod 31 and the rear upper rod 33, and a lower end thereof is slidably connected to the rear lower rod 34.The above descriptions are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and that such improvements and modifications also fall within the scope of the present invention.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedCN 216374594U

[0002]

Claims

A folding cart, comprising a front frame (1) and a rear frame (2) disposed front-rear, and a side frame (3) for unfolding and collapsing disposed therebetween, wherein the side frame (3) comprises a front upper bar (31), a front lower bar (32), a rear upper bar (33), and a rear lower bar (34), front ends of the front upper bar (31) and the front lower bar (32) are hinged to an upper side and a lower side of the front frame (1), rear ends of the rear upper bar (33) and the rear lower bar (34) are hinged to an upper side and a lower side of the rear frame (2), respectively, a rear side of the front upper rod (31) is hinged to a front side of the rear upper rod (33) and a rear side of the front lower rod (32) is hinged to a front side of the rear lower rod (34); characterized in that the side frame (3) further includes a front tilt rod (35) and a rear tilt rod (36); an upper end of the front tilt rod (35) is hinged between the front upper rod (31) and the rear upper rod (33) and a lower end thereof is slidably connected to the front frame (1) or the front lower rod (32); and an upper end of the rear tilt rod (36) is hinged between the front upper rod (31) and the rear upper rod (33) and a lower end thereof is slidably connected to the rear frame (2) or the rear lower rod (34).The folding cart according to claim 1, characterized in that the side frame (3) further comprises a front support rod (3a) and a rear support rod (3b); an upper end of the front support rod (3a) is hinged to a central portion of the front tilt rod (35), and a lower end thereof is slidably connected to the front lower rod (32); and an upper end of the rear support rod (3b) is hinged to a central portion of the rear tilt rod (36), and a lower end thereof is slidably connected to the rear lower rod (34).The folding cart according to claim 1, characterized in that: the folding cart further comprises an upper hinge bearing (37) disposed between the front upper rod (31) and the rear upper rod (33), a front end of the upper hinge bearing (37) is hinged to a rear end of the front upper rod (31), a rear end of the upper hinge bearing (37) is hinged to a front end of the rear upper rod (33), and the upper ends of the front tilt rod (35) and the rear tilt rod (36) are each hinged to the upper hinge bearing (37).The folding cart according to claim 3, characterized in that a connecting member (38) is disposed at a lower side of the upper hinge bearing (37), and the upper hinge bearing (37) is hinged to the upper ends of the front tilt bar (35) and the rear tilt bar (36) via the connecting member (38).The folding cart according to claim 4, characterized in that the link member (38) is inversely T-shaped, and a front end of the link member (38) is hinged to an upper end of the front tilt bar (35), and a rear end thereof is hinged to an upper end of the rear upper bar (33).The folding cart according to claim 4, characterized in that the upper ends of the front tilt bar (35) and the rear tilt bar (36) are sequentially hinged to a central portion of the upper hinge bearing (37).The folding cart according to any one of claims 3 to 6, characterized in that the upper ends of the front tilt bar (35) and the rear tilt bar (36) are rotated about a hinge when the folding cart is folded from an unfolded state to a folded state, so that the ends remote from the hinge gradually approach in a downward direction.The folding cart according to any one of claims 3 to 6, characterized in that the upper ends of the front tilt bar (35) and the rear tilt bar (36) are rotated about a hinge when the folding cart is unfolded from a folded state to an unfolded state, so that the ends close to the hinge gradually move upward.Foldable cart according to claim 3, characterized in that the front upper rod (31), the rear upper rod (33) and the upper hinge bearing (37) are all arranged transversely in an unfolded state of the foldable cart.The folding cart according to claim 3, characterized in that the front upper rod (31) and the rear upper rod (33) are vertically arranged when folding the folding cart from an unfolded state to a folded state, and the upper hinge bearing (37) is held transversely arranged.The folding cart according to claim 1, characterized in that a front shoe (351) is hinged to a lower end of the front tilt bar (35), and the front shoe (351) is sheathed on the front lower bar (32) and slidable along the front lower bar (32); and a rear shoe (361) is hinged to a lower end of the rear tilt bar (36), and the rear shoe (361) is sheathed on the rear lower bar (34) and slidable along the rear lower bar (34).The folding cart according to claim 2, characterized in that, in a folded-open state of the folding cart, the front support rod (3a) is vertically connected between the front tilt rod (35) and the front lower rod (32), and the rear support rod (3b) is vertically connected between the rear tilt rod (36) and the rear lower rod (34).The folding cart according to claim 3, characterized in that a cross section of the upper hinge bearing (37) is inverted n-shaped, and a front side and a rear side of the upper hinge bearing (37) are sheathed at end portions of the front upper rod (31) and the rear upper rod (33), respectively.The folding cart according to claim 2, characterized in that the front support rod (3a) is vertically connected between the front tilt rod (35) and the front lower rod (32), the rear support rod (3b) is vertically connected between the rear tilt rod (36) and the rear lower rod (34), and when the folding cart is unfolded, the front support rod (3a) and the rear support rod (3b) are vertically arranged.The folding cart according to claim 2, characterized in that a rear end of the front lower rod (32) is hinged to the front of the rear lower rod (34), and the front of the rear lower rod (34) abuts an upper side surface of the front lower rod (32) in a folded-up state of the folding cart.

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