Foldable cart

Abstract

The utility model relates to a foldable cart which comprises a functional frame assembly and a bottom plate frame assembly. The functional frame assembly comprises a front functional frame and a rear functional frame; rollers are arranged on the front functional frame and the rear functional frame; the front functional frame and / or the rear functional frame are / is provided with functional parts; the bottom plate frame assembly comprises a front bottom plate frame and a rear bottom plate frame; one end of the front bottom plate frame is horizontally hinged to the front functional frame, and one end of the rear bottom plate frame is horizontally hinged to the rear functional frame; the other end of the front bottom plate frame is directly or indirectly horizontally hinged with the other end of the rear bottom plate frame, and the linkage assembly comprises a front linkage rod, a rear linkage rod and a connecting piece. According to the utility model, the stable unfolding state of the foldable cart can be ensured, the uniform arrangement stress of the functional frame assembly can be ensured, and the overall strength of the functional frame assembly can be improved on the premise of the same consumables; and the parallel posture stability of the front bottom plate frame and the rear bottom plate frame in the folding state can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the trolley technical field, in particular to foldable trolley. BACKGROUND

[0002] CN107848551A discloses a foldable trolley, comprising: a frame having a first end assembly and an opposite second end assembly; a chassis assembly comprising a first chassis assembly and a second chassis assembly, the first chassis assembly being pivotally connected to the first end assembly, the second chassis assembly being pivotally connected to the second end assembly, the first chassis assembly being pivotally connected to the second chassis assembly; a coupling assembly connected to the first end assembly and the second end assembly, the coupling assembly having a first coupling member and a second coupling member, the first coupling member being pivotally connected to the first end assembly, the second coupling member being pivotally connected to the second end assembly, wherein the first coupling member is also pivotally connected to the second coupling member; and a flexible housing located on a portion of the frame.

[0003] The first coupling member and the second coupling member of the foldable trolley disclosed by CN107848551A are respectively hinged on the same side of the frame, and when both of them bear weight, the torsion of the frame is inward, so that the overall stress of the frame is biased to one side and the stress is uneven, and the overall strength has further improvement space. SUMMARY

[0004] One purpose of the utility model is to solve or alleviate the above technical problems.

[0005] The utility model adopts the means that foldable trolley, including function frame subassembly and bottom plate frame subassembly, function frame subassembly includes front function frame and rear function frame, front function frame and rear function frame all are provided with gyro wheel, front function frame and / or rear function frame are provided with function piece, bottom plate frame subassembly includes front bottom plate frame and rear bottom plate frame, one end of front bottom plate frame and rear function frame horizontal hinged, one end of rear bottom plate frame and rear function frame horizontal hinged, the other end of front bottom plate frame and the other end of rear bottom plate frame are directly or indirectly horizontal hinged, still include linkage assembly, linkage assembly includes front linkage rod, rear linkage rod and connecting piece, one end of front linkage rod and one side of front function frame vertical hinged, one end of rear linkage rod and the other side of rear function frame vertical hinged, front linkage rod, rear linkage rod are parallel with each other and are connected with connecting piece linear sliding respectively, and front linkage rod, rear linkage rod, connecting piece all are located the below of bottom plate frame subassembly.

[0006] The utility model discloses the effect that can ensure that collapsible cart deployment state stable, can ensure that the function frame assembly arrangement stress is even, can improve the overall strength of function frame assembly under the premise of same consumable, can also ensure that the posture of front bottom plate frame, rear bottom plate frame is stable when folding.

[0007] Further technical solutions, at least one of the front linkage rod, the rear linkage rod and the connecting piece abuts or contacts the bottom plate frame assembly to support the bottom plate frame assembly.

[0008] The bottom plate frame assembly's bearing capacity and stability can be improved when being unfolded.

[0009] Further technical solutions, the connecting piece is provided with a connecting groove, and the front linkage rod and the rear linkage rod are respectively inserted into the connecting groove in a fitted manner, or the connecting piece is hinged to at least three columns of linear sliding rollers, and the front linkage rod and the rear linkage rod are respectively inserted into the gap between the linear sliding rollers of the adjacent two columns in a fitted manner.

[0010] The reliability of the linear sliding connection between the front linkage rod, the rear linkage rod and the connecting piece can be ensured.

[0011] Further technical solutions, the linkage assembly further comprises a reinforcing piece, the strength of the reinforcing piece is greater than that of the connecting piece, the reinforcing piece is in the form of a sheet and is fixedly connected to the top end and / or the bottom end face of the connecting piece, or the reinforcing piece is in the form of a cylinder and is sleeved on the connecting piece.

[0012] The strength and bearing capacity of the connecting piece can be improved.

[0013] Further technical solutions, the front bottom plate frame and the rear bottom plate frame are of the same length, the front linkage rod, the rear linkage rod and the connecting piece are rotationally symmetrical about the center of the connecting piece when viewed from above, and the linkage assembly further comprises connecting wheels, which are hinged to the center of the connecting piece and are in fitted connection with the front linkage rod and the rear linkage rod respectively.

[0014] The front linkage rod and the rear linkage rod can smoothly slide linearly.

[0015] Further technical solutions, the front linkage rod and the rear linkage rod are both provided with linkage teeth, and the connecting wheels are in the form of gears and are in meshing connection with the linkage teeth.

[0016] The connecting piece can be centered, the front linkage rod and the rear linkage rod can be prevented from being stuck relative to the connecting piece, and thus the collapsible cart can be smoothly unfolded and folded.

[0017] Further technical solutions, the end of the front linkage rod and the end of the rear linkage rod are both provided with limiting protrusions, and the limiting protrusions abut against the side face of the connecting piece when being unfolded.

[0018] The connecting piece can be centered while ensuring the reliability of the linkage assembly.

[0019] A further technical solution also includes a locking plug, which is embedded between the front linkage rod and the rear linkage rod in the folded state.

[0020] It can ensure that the foldable stroller is stable in the folded state.

[0021] According to a further technical solution, the bottom plate frame assembly also includes a rectangular middle bottom plate frame, the other end of the front bottom plate frame and the other end of the rear bottom plate frame are hinged to the middle bottom plate frame respectively, and the front bottom plate frame and the rear bottom plate frame are both vertical in the folded state.

[0022] When folded, there is space between the front bottom frame and the rear bottom frame that can be used to accommodate objects, which is more convenient.

[0023] According to a further technical solution, the top end and / or the bottom end of the connecting wheel extend outward to form a connecting wheel rim, and the connecting wheel rim is respectively against the front linkage rod and the rear linkage rod.

[0024] It can improve the torsion resistance and load-bearing capacity of the connecting parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The foldable stroller is in the unfolded state Figures 1 to 3 As shown; the folded state of the foldable stroller is Figures 10 to 12 is displayed.

[0026] Figure 1 This is a three-dimensional diagram of the foldable cart of the first embodiment. Figure 1 .

[0027] Figure 2 This is a three-dimensional diagram of the foldable cart of the first embodiment. Figure 2 .

[0028] Figure 3 This is a three-dimensional diagram of the foldable cart of the first embodiment. Figure 3 ; The base frame assembly 2 is not shown.

[0029] Figure 4 It is a perspective exploded schematic diagram of the linkage assembly 3 of the first embodiment.

[0030] Figure 5 FIG. 3 is a schematic perspective view of the connecting member 33 of the first embodiment.

[0031] Figure 6 FIG. 1 is a partially cutaway schematic diagram of the connecting member 33 of the first embodiment.

[0032] Figure 7 3 is a side view of the linkage assembly 3 of the first embodiment.

[0033] Figure 8 This is a schematic diagram of section 1 SEC1.

[0034] Figure 9 is a schematic view of section two SEC2.

[0035] Figure 10 is a perspective view of the foldable cart of the first embodiment Figure 4 .

[0036] Figure 11 is a side view of the foldable cart of the first embodiment.

[0037] Figure 12 is a top view of the foldable cart of the first embodiment; the floor frame assembly 2 is not drawn.

[0038] Figure 13 is a perspective exploded view of the connector 33 and the reinforcing member 36 of the second embodiment.

[0039] Figure 14 is a perspective view of the connector 33 and the reinforcing member 36 of the second embodiment.

[0040] Figure 15 is a perspective view of the floor frame assembly 2 of the third embodiment; the circles represent the hinge joints of the middle floor frame 25 with the front floor frame 21 and the rear floor frame 22 respectively, the line one LINE1 represents the axis of the hinge joints of the middle floor frame 25 with the front floor frame 21 and the rear floor frame 22 respectively; the dashed lines represent the simplified straight lines of the front floor frame 21, the rear floor frame 22 and the middle rod clamp 241 in the folded state of the first embodiment.

[0041] Figure 16 is a side view of the connecting wheel 332, the front linkage rod 31 and the rear linkage rod 32 of the fourth embodiment; the connecting wheel 332 is half cut (i.e. cut by a plane passing through the axis of the connecting wheel 332), the line two LINE2 represents the axis of the connecting wheel 332.

[0042] designated in the drawings Figure 3 is the abstract drawing.

[0043] section one SEC1; section two SEC2; line one LINE1; line two LINE2; functional frame assembly 1; front functional frame 11; rear functional frame 12; connecting ear 13; cross beam 131; functional member 18; stand 181; handle 182; folding support frame 183; roller brake 184; roller 19; universal shaft 191; floor frame assembly 2; front floor frame 21; rear floor frame 22; support column 23; middle rod 24; middle rod clamp 241; middle floor frame 25; linkage assembly 3; front linkage rod 31; rear linkage rod 32; connector 33; connecting slot 331; connecting wheel 332; connecting rim 333; connecting wheel slot 334; linkage tooth 34; connecting pin 35; reinforcing member 36; limiting protrusion 37; locking plug 4. DETAILED DESCRIPTION

[0044] The specific embodiments of the present application will be described below with reference to the accompanying drawings.

[0045] As a specific embodiment, the foldable cart of the first embodiment includes a functional frame assembly 1 and a bottom frame assembly 2.

[0046] The functional frame assembly 1 includes a front functional frame 11 and a rear functional frame 12. In other words, the functional frame assembly 1 includes two functional frames, which are the front functional frame 11 and the rear functional frame 12, respectively. It is easy to understand that the front and rear of the front functional frame 11 and the rear functional frame 12 are only relative concepts set for the convenience of distinction, so although the functional frame provided with the later-described handle 182 is usually referred to as the front functional frame 11, it is not excluded that the functional frame provided with the later-described handle 182 is referred to as the rear functional frame 12. Similarly, the front and rear of the later-described front bottom frame 21 and rear bottom frame 22 and the front and rear of the later-described front linkage rod 31 and rear linkage rod 32 are also relative concepts set for the convenience of distinction, and it is not excluded that the bottom frame corresponding to the front bottom frame 21 is referred to as the rear bottom frame 22, nor is it excluded that the support rod corresponding to the front linkage rod 31 is referred to as the rear linkage rod 32.

[0047] The front functional frame 11 and the rear functional frame 12 are both provided with rollers 19. The front functional frame 11 is connected to the front functional frame 11 through a universal shaft 191, so that the rollers 19 of the front functional frame 11 can rotate around a vertical axis to realize universal rotation.

[0048] The front functional frame 11 and / or the rear functional frame 12 are provided with functional parts 18. The functional parts 18 are used to realize specific functions of the cart, such as at least one of the stand 181, the handle 182, the folding support frame 183, the roller brake 184, etc. Among them, the stand 181 is used to support or fix a flexible bag body (not shown in the drawing, such as the flexible shell 26 in CN107848551A), and four stands 181 support or fix four vertical edges of the flexible bag body so that the flexible bag body forms a rectangular box shape with an open top, and the space inside the rectangular box shape can be used to contain articles. Among them, the handle 182 is connected with the front functional frame 11, which is convenient for pulling the foldable cart through the handle 182. Among them, the folding support frame 183 can be rotated to fold or open, and it can also be used as a support for articles by pulling the foldable cart. Among them, the roller brake 184 is used to limit or unlock the rotation of the roller 19, so that the foldable cart is temporarily fixed or easily moved. Of course, the functional parts 18 can also include other structures for realizing the functions of the cart in the prior art.

[0049] The bottom frame assembly 2 comprises a front bottom frame 21 and a rear bottom frame 22; the front bottom frame 21 is horizontally hinged at one end to the front function frame 11, and the rear bottom frame 22 is horizontally hinged at one end to the rear function frame 12; the other end of the front bottom frame 21 is directly or indirectly horizontally hinged to the other end of the rear bottom frame 22, for example, the other end of the front bottom frame 21 is hinged to the other end of the rear bottom frame 22 through a pin shaft (not shown in the figure, for example, the pin shaft is coaxial with the middle rod 24 described later) so that the two are directly horizontally hinged. The horizontal hinge is to arrange the hinge axis in the horizontal plane, so that the structure of the aforementioned bottom frame assembly 2 enables the front bottom frame 21 to rotate around a horizontal straight line relative to the front function frame 11, the rear bottom frame 22 to rotate around a horizontal straight line relative to the rear function frame 12, and the front bottom frame 21 to rotate around a horizontal straight line relative to the rear bottom frame 22.

[0050] The foldable cart of the first embodiment further comprises a linkage assembly 3, which comprises a front linkage rod 31, a rear linkage rod 32, and a connecting piece 33.

[0051] The front linkage rod 31 is vertically hinged at one end to one side of the front function frame 11 (for example, the front function frame 11 is provided with a cross beam 131, both ends of the cross beam 131 are provided with connecting ears 13, and the front linkage rod 31 is vertically hinged at one end to one side of the front function frame 11 through the connecting ears 13), and the rear linkage rod 32 is vertically hinged at one end to the other side of the rear function frame 12. It is easy to understand that one side of the front function frame 11 and one side of the rear function frame 12 are on the same side, and one side of the front function frame 11 is opposite to the other side of the rear function frame 12.

[0052] The front linkage rod 31 and the rear linkage rod 32 are parallel to each other and are linearly slidingly connected to the connecting piece 33 respectively, and a horizontal gap is provided between the front linkage rod 31 and the rear linkage rod 32, which enables the front linkage rod 31 and the rear linkage rod 32 to move along the connecting piece 33 without interfering with each other.

[0053] The front linkage rod 31, the rear linkage rod 32, and the connecting piece 33 are all located below the bottom frame assembly 2.

[0054] The working principle is that the foldable cart has an unfolded state and a folded state.

[0055] Rotate the front bottom frame 21 and the rear bottom frame 22 so that both are horizontal (the front bottom frame 21 and the rear bottom frame 22 are used to support the bottom of the flexible bag). At this time, the distance between the front functional frame 11 and the rear functional frame 12 is the largest, and the foldable stroller is in the unfolded state. At this time, the front functional frame 11, the front bottom frame 21, the rear bottom frame 22, and the rear functional frame 12 are all in a U-shape and are hinged to the functional frame assembly 1 in a horizontal hinge. The front bottom frame 21, the front linkage rod 31, the rear linkage rod 32, and the rear bottom frame 22 are all in a Z-shape when viewed from above (refer to Figure 3 As shown in the figure, the front functional frame 11 or the rear functional frame 12 cannot rotate relative to the bottom frame assembly 2, and the hinges of the front bottom frame 21 and the rear bottom frame 22 (refer to the middle rod card 241) will not automatically move upward (in addition, the front bottom frame 21 and the rear bottom frame 22 usually also bear the weight in the flexible bag body), which can ensure that the foldable cart is stable when unfolded; compared with the prior art in which the front linkage rod 31 and the rear linkage rod 32 are both hinged on the same side of the functional frame assembly 1, Since one end of the front linkage rod 31 is vertically hinged to one side of the front functional frame 11, and one end of the rear linkage rod 32 is vertically hinged to the other side of the rear functional frame 12, the front bottom plate frame 21, the front linkage rod 31, the rear linkage rod 32, and the rear bottom plate frame 22 are overall Z-shaped when viewed from above. The torsional force of the front linkage rod 31 on the front functional frame 11 and the torsional force of the rear linkage rod 32 on the rear functional frame 12 are inward and can offset each other, which can ensure that the functional frame assembly 1 is evenly stressed and the overall strength of the functional frame assembly 1 can be improved under the premise of the same consumables.

[0056] The hinges of the front bottom frame 21 and the rear bottom frame 22 are moved upward, and the front bottom frame 21 and the rear bottom frame 22 are tilted, so that the distance between the front function frame 11 and the rear function frame 12 is reduced. In this process, the front function frame 11, the front bottom frame 21, the rear bottom frame 22, and the rear function frame 12 are generally W-shaped as the distance between the front function frame 11 and the rear function frame 12 changes; the front linkage rod 31 and the rear linkage rod 32 respectively rotate around the connecting ear 13 described later and also slide linearly along the connecting piece 33. When the front function frame 11, the front linkage rod 31, the rear linkage rod 32, and the rear function frame 12 are approximately parallel to each other, the distance between the front function frame 11 and the rear function frame 12 is the smallest, and the foldable stroller is in a folded state. At this time, the front functional frame 11 or the rear functional frame 12 cannot rotate relative to the bottom frame assembly 2. Although the hinges of the front bottom frame 21 and the rear bottom frame 22 tend to move downward due to their own weight, it is still possible to ensure that the front bottom frame 21 and the rear bottom frame 22 are parallel to each other and maintain a stable posture when folded (please refer to the previous paragraph about horizontal hinges and vertical hinges).

[0057] As one of the specific embodiments, at least one of the front linkage rod 31, the rear linkage rod 32 and the connecting piece 33 is in abutment or contact with the bottom frame assembly 2 to support the bottom frame assembly 2. For example, the bottom end surface of the front bottom frame 21 and the bottom end surface of the rear bottom frame 22 are both fixedly provided with support columns 23, and the support columns 23 are in abutment with the front linkage rod 31 and the rear linkage rod 32, respectively. The support columns 23 are made of rubber or plastic and have a certain flexibility, and are fixed on the front linkage rod 31 and the rear linkage rod 32 by screws. The top end of the connecting piece 33 is fixedly provided with a middle rod clamp 241, and the bottom frame assembly 2 includes a middle rod 24, the axis line of the hinge joint between the front bottom frame 21 and the rear bottom frame 22 is coaxial with the axis line of the middle rod 24, and the middle rod 24 is clamped into the middle rod clamp 241 to realize contact. The load-bearing capacity and stability of the bottom frame assembly 2 in the unfolded state can be improved.

[0058] As one of the specific embodiments, the connecting piece 33 is provided with a connecting groove 331, and the front linkage rod 31 and the rear linkage rod 32 are respectively inserted into the connecting groove 331 in a close-fitting manner, so that the front linkage rod 31 and the rear linkage rod 32 are respectively connected in linear sliding connection with the connecting piece 33. Alternatively, the connecting piece 33 is hingedly connected with at least three rows of linear sliding rollers (the embodiment of the linear sliding roller is not shown in the drawing, and the linear sliding rollers arranged along one straight line of one connecting groove 331 are one row of linear sliding rollers, such as Figure 5 As one of the specific embodiments, the connecting piece 33 is provided with a connecting groove 331, and the front linkage rod 31 and the rear linkage rod 32 are respectively inserted into the connecting groove 331 in a close-fitting manner, so that the front linkage rod 31 and the rear linkage rod 32 are respectively connected in linear sliding connection with the connecting piece 33. Alternatively, the connecting piece 33 is hingedly connected with at least three rows of linear sliding rollers (the embodiment of the linear sliding roller is not shown in the drawing, and the linear sliding rollers arranged along one straight line of one connecting groove 331 are one row of linear sliding rollers, such as

[0059] As one of the specific embodiments, the linkage assembly 3 further includes a reinforcing piece 36, and the strength of the reinforcing piece 36 is greater than that of the connecting piece 33. For example, the connecting piece 33 is usually made of plastic, and the reinforcing piece 36 is made of metal. The reinforcing piece 36 is in the form of a sheet and is fixedly connected to the top end and / or the bottom end surface of the connecting piece 33. The strength and load-bearing capacity of the connecting piece 33 can be improved.

[0060] As one of the specific embodiments, the front bottom frame 21 and the rear bottom frame 22 have the same length (the length of the front bottom frame 21 is the distance between the two hinge shaft center lines of the front bottom frame 21, and the same for the rear bottom frame 22); the front linkage rod 31, the rear linkage rod 32 and the connecting piece 33 are rotationally symmetrical about the center of the connecting piece 33 when viewed from above; the linkage assembly 3 further comprises a connecting wheel 332 which is hinged at the center of the connecting piece 33 and respectively abuts the front linkage rod 31 and the rear linkage rod 32. It can ensure that the front linkage rod 31 and the rear linkage rod 32 slide smoothly in a straight line. For example, the connecting piece 33 is provided with a connecting wheel groove 334 which is in communication with the connecting groove 331, and the connecting wheel 332 is arranged in the connecting wheel groove 334; the connecting wheel 332 is hinged to the connecting piece 33 by the connecting pin 35.

[0061] As one of the specific embodiments, the front linkage rod 31 and the rear linkage rod 32 are each provided with a linkage tooth 34; the connecting wheel 332 is a gear and engages with the linkage tooth 34. It can ensure that the connecting piece 33 is centered and prevent the front linkage rod 31 and the rear linkage rod 32 from being stuck relative to the connecting piece 33, so as to ensure that the foldable stroller can be smoothly unfolded and folded.

[0062] As one of the specific embodiments, the end of the front linkage rod 31 and the end of the rear linkage rod 32 are each provided with a limiting protrusion 37 which abuts the side surface of the connecting piece 33 in the unfolded state. It can prevent the front linkage rod 31 or the rear linkage rod 32 from being separated from the connecting piece 33, ensure the reliability of the linkage assembly 3, and at the same time, the front linkage rod 31 and the rear linkage rod 32 have the same length, which can ensure that the connecting piece 33 is centered (even if the connecting wheel 332 is not a gear). For the structure in which the connecting wheel 332 is a gear matched with the linkage tooth 34, the end of the linkage tooth 34 close to the limiting protrusion 37 is provided with a toothless section

not marked in the figure

such as the distance of one linkage tooth 34

[0063] As one of the specific embodiments, the foldable cart further comprises a locking plug 4, which is embedded between the front linkage rod 31 and the rear linkage rod 32 in the folded state. For example, the locking plug 4 is a square column made of plastic, and the top end of the locking plug 4 is larger to prevent it from falling out of the front linkage rod 31 and the rear linkage rod 32. In the folded state, the locking plug 4 is embedded between the front linkage rod 31 and the rear linkage rod 32 to limit the movement of the front linkage rod 31 and the rear linkage rod 32, thereby ensuring the stability of the foldable cart in the folded state. The locking plug 4 can be pulled out of the front linkage rod 31 and the rear linkage rod 32 to achieve unlocking, and the locking and unlocking are relatively convenient.

[0064] The second embodiment is as follows.

[0065] The foldable cart of the second embodiment is mainly different from the first embodiment in that it comprises a reinforcing member 36.

[0066] As shown in Figure 13 , 14 , the reinforcing member 36 of the second embodiment is a cylindrical shape and is sleeved on the connecting member 33. The strength and load-bearing capacity of the connecting member 33 can be further improved.

[0067] The third embodiment is as follows.

[0068] The foldable cart of the third embodiment is mainly different from the first embodiment in that it comprises a bottom frame assembly 2.

[0069] As shown in Figure 15 , the bottom frame assembly 2 of the third embodiment further comprises a middle bottom frame 25 in the shape of a rectangular frame (for example, four straight rods are fixedly connected in sequence to form a rectangular frame, and it is easy to understand that the middle part of the rectangular frame is not blocked). The other end of the front bottom frame 21 and the other end of the rear bottom frame 22 are hingedly connected to the middle bottom frame 25, so that the other end of the front bottom frame 21 and the other end of the rear bottom frame 22 are indirectly hingedly connected. In the folded state, the front bottom frame 21 and the rear bottom frame 22 are both vertical, and in the normal side view, the front bottom frame 21 and the rear bottom frame 22 are respectively coincident with the vertical column 181. It is easy to understand that the lengths of the front bottom frame 21 and the rear bottom frame 22 are equal, and in the folded state, the front bottom frame 21 and the rear bottom frame 22 are both vertical, so that the middle bottom frame 25 is horizontal, and the middle part of the middle bottom frame 25 is not blocked. At this time, there is a space between the front bottom frame 21 and the rear bottom frame 22 that can be used to accommodate objects, which can be used to accommodate the flexible bag body and the like, which is relatively convenient.

[0070] The fourth embodiment is as follows.

[0071] The foldable cart of the fourth embodiment is mainly different from the first embodiment in that it comprises a connecting wheel 332.

[0072] As shown in Figure 16As shown, the top end and / or the bottom end of the connecting wheel 332 of the fourth embodiment extends outward to form a connecting rim 333, which abuts against the front linkage rod 31 and the rear linkage rod 32, respectively. For example, the connecting wheel 332 is cylindrical without teeth, and the connecting rim 333 is disc-shaped, as shown in FIG. 6. Figure 15 As shown, the connecting wheel 332 is partially cut to show that the connecting wheel 332 is H-shaped. This can improve the torsional strength (resistance to the torsional force of the front linkage rod 31 and the rear linkage rod 32) and the load-bearing capacity of the connecting member 33.

[0073] As used in the present disclosure, the terms "first", "second", and the like, do not denote any order, quantity, or importance, but are used only to distinguish.

[0074] As used in the present disclosure, the terms "one", "an", and the like, do not denote a quantity restriction, but denote the existence of at least one of the objects mentioned.

[0075] As used in the present disclosure, the terms indicating direction or position, such as "top", "bottom", "side", "longitudinal", "transverse", "middle", "center", "outer", "inner", "horizontal", "vertical", "left", "right", "up", "down", and the like, mean reflecting relative position, not absolute position.

[0076] As used in the present disclosure, the terms "approximately", "entirely", "nearly", "similarly", and the like, are used as limiting terms to indicate that there is a characteristic, but a certain deviation is allowed. The amount of the allowed deviation can vary depending on the specific context; for example, the deviation for size can depend on the relevant standards for size tolerance, among other specific contexts.

Claims

1. A foldable cart, comprising a functional frame assembly (1) and a bottom frame assembly (2); the functional frame assembly (1) comprises a front functional frame (11) and a rear functional frame (12); the front functional frame (11) and the rear functional frame (12) are both provided with rollers (19); the front functional frame (11) and / or the rear functional frame (12) are provided with functional parts (18); the bottom frame assembly (2) comprises a front bottom frame (21) and a rear bottom frame (22); one end of the front bottom frame (21) is horizontally hinged to the front functional frame (11), and one end of the rear bottom frame (22) is horizontally hinged to the rear functional frame (12); the other end of the front bottom frame (21) is horizontally hinged to the other end of the rear bottom frame (22), directly or indirectly, Its characteristics are: The invention also includes a linkage assembly (3), which includes a front linkage rod (31), a rear linkage rod (32) and a connecting piece (33); one end of the front linkage rod (31) is vertically hinged to one side of the front functional frame (11), and one end of the rear linkage rod (32) is vertically hinged to the other side of the rear functional frame (12); the front linkage rod (31) and the rear linkage rod (32) are parallel to each other and are respectively linearly slidably connected to the connecting piece (33), and a horizontal gap is provided between the front linkage rod (31) and the rear linkage rod (32), and the front linkage rod (31), the rear linkage rod (32) and the connecting piece (33) are all located below the bottom plate frame assembly (2).

2. The foldable stroller according to claim 1, wherein: At least one of the front linkage rod (31), the rear linkage rod (32), and the connecting member (33) abuts against or contacts the bottom plate frame assembly (2) to support the bottom plate frame assembly (2).

3. The foldable stroller according to claim 1, wherein: The connecting member (33) is provided with a connecting groove (331), and the front linkage rod (31) and the rear linkage rod (32) are respectively and snugly inserted into the connecting groove (331); or, the connecting member (33) is hinged to at least three rows of linear sliding rollers, and the front linkage rod (31) and the rear linkage rod (32) are respectively and snugly inserted into the gaps between the linear sliding rollers in two adjacent rows.

4. The foldable stroller according to claim 1, wherein: The linkage assembly (3) further comprises a reinforcing member (36), the strength of which is greater than the strength of the connecting member (33); the reinforcing member (36) is sheet-shaped and fixedly connected to the top end and / or bottom end surface of the connecting member (33), or the reinforcing member (36) is cylindrical and sleeved on the connecting member (33).

5. The foldable stroller according to claim 1, wherein: The front bottom plate frame (21) and the rear bottom plate frame (22) have the same length; the front linkage rod (31), the rear linkage rod (32) and the connecting member (33) are rotationally symmetrical about the center of the connecting member (33) when viewed from above; the linkage assembly (3) further comprises a connecting wheel (332), which is hinged at the center of the connecting member (33) and is respectively fitted with the front linkage rod (31) and the rear linkage rod (32).

6. The foldable stroller according to claim 5, wherein: The front linkage rod (31) and the rear linkage rod (32) are both provided with linkage teeth (34); the connecting wheel (332) is a gear and meshes with the linkage teeth (34).

7. The foldable stroller according to claim 3, wherein: The ends of the front linkage rod (31) and the rear linkage rod (32) are both provided with a limiting protrusion (37), and in the unfolded state, the limiting protrusion (37) abuts against the side surface of the connecting member (33).

8. The foldable stroller according to claim 1, wherein: The utility model also comprises a locking plug (4), which is embedded between the front linkage rod (31) and the rear linkage rod (32) in the folded state.

9. The foldable stroller according to claim 5, wherein: The bottom plate frame assembly (2) also includes a rectangular frame-shaped middle bottom plate frame (25). The other end of the front bottom plate frame (21) and the other end of the rear bottom plate frame (22) are respectively hinged to the middle bottom plate frame (25). In the folded state, the front bottom plate frame (21) and the rear bottom plate frame (22) are both vertical.

10. The foldable stroller according to claim 5, wherein: The top and / or bottom end of the connecting wheel (332) extends outward to form a connecting wheel rim (333), and the connecting wheel rim (333) is respectively against the front linkage rod (31) and the rear linkage rod (32).

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