Foldable cart

Abstract

The invention 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 foldable cart, it can be ensured that the functional frame assembly is uniform in arrangement stress while it can be ensured that the foldable cart is in an unfolded state, 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 present invention relates to the technical field of carts, in particular to a foldable cart. Background Art

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

[0003] The foldable trolley disclosed in CN107848551A has a first connecting member and a second connecting member hinged on the same side of a frame. When the two connect to bear load, the torque on the frame is inward, so that the overall force on the frame is biased to one side and unevenly stressed. There is room for further improvement in the overall strength of the frame. Summary of the invention

[0004] An object of the present invention is to solve or alleviate the above technical problems.

[0005] The means adopted by the present invention is that a foldable cart comprises a function frame assembly and a bottom plate frame assembly; the function frame assembly comprises a front function frame and a rear function frame; the front function frame and the rear function frame are both provided with rollers; the front function frame and / or the rear function frame are 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 function frame, and one end of the rear bottom plate frame is horizontally hinged to the rear function frame; the other end of the front bottom plate frame is directly or indirectly horizontally hinged to the other end of the rear bottom plate frame, and also comprises a linkage assembly, the linkage assembly comprises a front linkage rod, a rear linkage rod and a connecting member; one end of the front linkage rod is vertically hinged to one side of the front function frame, and one end of the rear linkage rod is vertically hinged to the other side of the rear function frame; the front linkage rod and the rear linkage rod are parallel to each other and are respectively linearly slidably connected to the connecting member, and a horizontal gap is provided between the front linkage rod and the rear linkage rod, and the front linkage rod, the rear linkage rod and the connecting member are all located below the bottom plate frame assembly.

[0006] The effect achieved by the present invention is that it can ensure that the unfolded state of the foldable cart is stable, and at the same time, it can ensure that the functional frame components are evenly stressed, and the overall strength of the functional frame components can be improved under the premise of the same consumables; it can also ensure that the front bottom plate frame and the rear bottom plate frame are in a stable posture parallel to each other in the folded state.

[0007] According to a further technical solution, at least one of the front linkage rod, the rear linkage rod and the connecting member abuts against or contacts the bottom plate frame assembly to support the bottom plate frame assembly.

[0008] The load-bearing capacity and stability of the bottom plate frame assembly in the unfolded state can be improved.

[0009] According to a further technical solution, the connecting member is provided with a connecting groove, and the front linkage rod and the rear linkage rod are respectively and snugly inserted into the connecting groove, or the connecting member is hinged to at least three rows of linear sliding rollers, and the front linkage rod and the rear linkage rod are respectively and snugly inserted into the gaps between the linear sliding rollers in two adjacent rows.

[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] According to a further technical solution, the linkage assembly also includes a reinforcement member, the strength of which is greater than the strength of the connecting member; the reinforcement member is sheet-shaped and fixedly connected to the top and / or bottom end surface of the connecting member, or the reinforcement member is cylindrical and sleeved on the connecting member.

[0012] Can improve the strength and load-bearing capacity of the connecting parts.

[0013] A further technical solution is that the front floor frame and the rear floor frame have the same length; the front linkage rod, the rear linkage rod and the connecting member are rotationally symmetrical about the center of the connecting member when viewed from above; the linkage assembly also includes a connecting wheel, which is hinged at the center of the connecting member and is respectively fitted with the front linkage rod and the rear linkage rod.

[0014] It can ensure that the front linkage rod and the rear linkage rod slide smoothly in a straight line.

[0015] According to a further technical solution, both the front linkage rod and the rear linkage rod are provided with linkage teeth; the connecting wheel is a gear and meshes with the linkage teeth.

[0016] The connection piece can be ensured to be centered, and the front linkage rod and the rear linkage rod can be prevented from being stuck relative to the connection piece, thereby ensuring that the foldable cart can be smoothly unfolded and folded.

[0017] According to a further technical solution, the ends of the front linkage rod and the rear linkage rod are both provided with limiting protrusions, and when in the unfolded state, the limiting protrusions abut against the side surfaces of the connecting piece.

[0018] While ensuring the reliability of the linkage components, it can also ensure that the connector is centered.

[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] The foldable stroller can be ensured to be 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 respectively hinged to the middle bottom plate frame, and the front bottom plate frame and the rear bottom plate frame are both vertical in the folded state.

[0022] In the folded state, 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 extends outward to form a connecting wheel rim, and the connecting wheel rim is respectively abutted 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 The folded state of the foldable stroller is shown as follows: Figures 10 to 12 as displayed.

[0026] Figure 1 Schematic diagram of the foldable stroller of the first embodiment Figure 1 .

[0027] Figure 2 Schematic diagram of the foldable stroller of the first embodiment Figure 2 .

[0028] Figure 3 Schematic diagram of the foldable stroller of the first embodiment Figure 3 ; The bottom plate 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 3 is a schematic three-dimensional view of the connecting member 33 of the first embodiment.

[0031] Figure 6 FIG. 1 is a schematic diagram of a partial cross-section of the connecting member 33 of the first embodiment.

[0032] Figure 7 1 is a schematic side view of the linkage assembly 3 of the first embodiment.

[0033] Figure 8 It is a schematic diagram of a cross section SEC1.

[0034] Fig. 9 This is a schematic diagram of section 2 SEC2.

[0035] Fig.10 Schematic diagram of the foldable stroller of the first embodiment Figure 4 .

[0036] Fig.11 1 is a schematic side view of the foldable stroller of the first embodiment.

[0037] Fig.12 1 is a schematic top view of the foldable stroller of the first embodiment; the bottom plate frame assembly 2 is not drawn.

[0038] Fig.13 It is a perspective exploded schematic diagram of the connecting member 33 and the reinforcing member 36 of the second embodiment.

[0039] Fig.14 3D is a schematic three-dimensional diagram of the connecting member 33 and the reinforcing member 36 of the second embodiment.

[0040] Fig.15 It is a simplified three-dimensional diagram of the bottom frame assembly 2 of the third embodiment; the circle represents the hinged joints of the middle bottom frame 25 with the front bottom frame 21 and the rear bottom frame 22 respectively, the line LINE1 represents the axis of the hinges of the middle bottom frame 25 with the front bottom frame 21 and the rear bottom frame 22 respectively; the dotted line represents the state in which the front bottom frame 21, the rear bottom frame 22 and the middle rod clamp 241 are simplified to straight lines when the first embodiment is in the folded state.

[0041] Fig.16 It is a simplified 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-sectioned (i.e., a plane obtained by a plane passing through the axis of the connecting wheel 332), and line 2 LINE2 represents the axis of the connecting wheel 332.

[0042] Designate the drawings in the specification Figure 3 Attached is the abstract.

[0043] Section 1 SEC1; Section 2 SEC2; Line 1 LINE1; Line 2 LINE2; Functional frame assembly 1; Front functional frame 11; Rear functional frame 12; Connecting ear 13; Crossbeam 131; Functional part 18; Post 181; Handle 182; Folding support frame 183; Roller brake 184; Roller 19; Universal shaft 191; Bottom plate frame assembly 2; Front bottom plate frame 21; Rear bottom plate frame 22; Support post 23; Middle rod 24; Middle rod clamp 241; Middle bottom plate frame 25; Linkage assembly 3; Front linkage rod 31; Rear linkage rod 32; Connecting piece 33; Connecting groove 331; Connecting wheel 332; Connecting wheel rim 333; Connecting wheel groove 334; Linkage tooth 34; Connecting pin 35; Reinforcement piece 36; Limiting protrusion 37; Locking plug 4. DETAILED DESCRIPTION

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

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

[0046] The function frame assembly 1 includes a front function frame 11 and a rear function frame 12. In other words, the function frame assembly 1 includes two function frames, which are the front function frame 11 and the rear function frame 12. It is easy to understand that the front and rear of the front function frame 11 and the rear function frame 12 are only relative concepts set for the convenience of distinction. Therefore, although the function frame provided with the handle 182 described later is usually called the front function frame 11, it does not exclude that the function frame provided with the handle 182 described later is called the rear function frame 12. Similarly, the front and rear of the front bottom plate frame 21 and the rear bottom plate frame 22 described later and the front and rear of the front linkage rod 31 and the rear linkage rod 32 described later are also relative concepts set for the convenience of distinction. It does not exclude that the bottom plate frame corresponding to the front bottom plate frame 21 is called the rear bottom plate frame 22, and it does not exclude that the support rod corresponding to the front linkage rod 31 is called the rear linkage rod 32.

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

[0048] The front function frame 11 and / or the rear function frame 12 are provided with a functional part 18. The functional part 18 is used to realize a specific function of the cart, for example, the functional part 18 includes at least one of a column 181, a handle 182, a folding support frame 183, a roller brake 184, etc. Among them, the column 181 is used to support or fix the flexible bag body (not shown in the accompanying drawings, such as the flexible shell 26 in CN107848551A), and the four columns 181 support or fix the four vertical edges of the flexible bag body so that the flexible bag body forms a rectangular box with an open top, and the space in the rectangular box can be used to accommodate objects. Among them, the handle 182 is connected to the front function frame 11, so that the foldable cart can be pulled by the handle 182. Among them, the folding support frame 183 can be rotated, folded or opened, and the foldable cart can be pulled by it, and it can also be used as a support object. Among them, the roller brake 184 is used to limit and unlock the rotation of the roller 19, so that the foldable cart is temporarily fixed and easy to move. Of course, the functional part 18 may also include other structures used in the prior art to realize the cart function.

[0049] The bottom plate frame assembly 2 includes a front bottom plate frame 21 and a rear bottom plate frame 22; one end of the front bottom plate frame 21 is horizontally hinged to the front functional frame 11, and one end of the rear bottom plate frame 22 is horizontally hinged to the rear functional frame 12; the other end of the front bottom plate frame 21 is directly or indirectly horizontally hinged to the other end of the rear bottom plate frame 22, for example, the other end of the front bottom plate frame 21 is hinged to the other end of the rear bottom plate frame 22 through a pin (not shown in the accompanying drawings, for example, the pin is coaxial with the intermediate rod 24 described later) so that the two are directly horizontally hinged. Horizontal hinge means that the axis of the hinge is located in the horizontal plane, so the structure of the above-mentioned bottom plate frame assembly 2 enables the front bottom plate frame 21 to rotate around a horizontal straight line relative to the front functional frame 11, the rear bottom plate frame 22 to rotate around a horizontal straight line relative to the rear functional frame 12, and the front bottom plate frame 21 to rotate around a horizontal straight line relative to the rear bottom plate frame 22.

[0050] The foldable stroller 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 member 33 .

[0051] One end of the front linkage rod 31 is vertically hinged to one side of the front function frame 11 (for example, the front function frame 11 is provided with a crossbeam 131, and both ends of the crossbeam 131 are provided with connecting ears 13, and one end of the front linkage rod 31 is vertically hinged to one side of the front function frame 11 through the connecting ears 13), and one end of the rear linkage rod 32 is vertically hinged 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 located 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 respectively connected to the connecting member 33 in a linear sliding manner, and a horizontal gap is provided between the front linkage rod 31 and the rear linkage rod 32. The horizontal gap between the front linkage rod 31 and the rear linkage rod 32 ensures that the front linkage rod 31 and the rear linkage rod 32 will not abut against and interfere with each other when they move along the connecting member 33.

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

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

[0055] The front bottom frame 21 and the rear bottom frame 22 are rotated 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 body). 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 an 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 in a U-shape as a whole and are hinged with the functional frame assembly 1 in a horizontal hinge, while the front bottom frame 21, the front linkage rod 31, the rear linkage rod 32, and the rear bottom frame 22 are in a Z-shape as a whole when viewed from above (refer to Figure 3 As shown in the figure, the front functional frame 11 or the rear functional frame 12 is vertically hinged with the functional frame assembly 1, and 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 clamp 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 unfolded state of the foldable cart is stable; 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 in a Z shape when viewed from above. The torsion of the front linkage rod 31 on the front functional frame 11 and the torsion of the rear linkage rod 32 on the rear functional frame 12 are inwardly directed and can offset each other, thereby ensuring that the functional frame assembly 1 is evenly stressed and improving the overall strength of the functional frame assembly 1 while maintaining the same consumables.

[0056] The hinges of the front bottom plate frame 21 and the rear bottom plate frame 22 are moved upward, and the front bottom plate frame 21 and the rear bottom plate 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 plate frame 21, the rear bottom plate frame 22, and the rear function frame 12 are generally in a W shape that changes with the distance between the front function frame 11 and the rear function frame 12; the front linkage rod 31 and the rear linkage rod 32 rotate around the connecting ear 13 described later and slide linearly along the connecting member 33 respectively. 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 cart 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 plate frame assembly 2. Although the hinges of the front bottom plate frame 21 and the rear bottom plate frame 22 have a tendency to move downward due to their own weight, it is still possible to ensure that the front bottom plate frame 21 and the rear bottom plate frame 22 are parallel to each other and maintain a stable posture when in the folded state (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 member 33 is against or in contact with the floor frame assembly 2 to support the floor frame assembly 2. For example, the bottom end surface of the front floor frame 21 and the bottom end surface of the rear floor frame 22 are fixedly provided with support columns 23, and the support columns 23 are respectively against the front linkage rod 31 and the rear linkage rod 32. The support columns 23 are made of rubber or plastic and have a certain flexibility. They are fixed to the front linkage rod 31 and the rear linkage rod 32 by screws. The top of the connecting member 33 is fixedly provided with an intermediate rod clamp 241. The floor frame assembly 2 includes an intermediate rod 24. The axis of the hinge of the front floor frame 21 and the rear floor frame 22 is coaxial with the intermediate rod 24. The intermediate rod 24 is clamped into the intermediate rod clamp 241 to achieve contact. The load-bearing capacity and stability of the floor frame assembly 2 in the unfolded state can be improved.

[0058] As one of the specific implementations, 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 inserted into the connecting groove 331, so that the front linkage rod 31 and the rear linkage rod 32 are respectively connected to the connecting member 33 in a linear sliding manner. Alternatively, the connecting member 33 is hinged to at least three rows of linear sliding rollers (the embodiment of the linear sliding rollers is not shown in the drawings, and the linear sliding rollers arranged along a straight line where a connecting groove 331 is located are a row of linear sliding rollers, such as Figure 5 As shown, there are three inner walls on the outside and inside of the two connecting grooves 331 of the connecting member 33, and the three inner walls are replaced by the linear sliding rollers, and the hinge axis of the linear sliding rollers is perpendicular to the top surface of the connecting member 33). It is easy to understand that there is a gap between the linear sliding rollers in two adjacent rows of three rows of linear sliding rollers, and the front linkage rod 31 and the rear linkage rod 32 are respectively inserted into the gap between the linear sliding rollers in the two adjacent rows, so that the front linkage rod 31 and the rear linkage rod 32 are respectively connected to the connecting member 33 in a linear sliding manner. The reliability of the linear sliding connection between the front linkage rod 31, the rear linkage rod 32 and the connecting member 33 can be ensured.

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

[0060] As one of the specific implementations, the length of the front floor frame 21 and the rear floor frame 22 (the length of the front floor frame 21 is the distance between the two hinge axis lines of the front floor frame 21, and the same is true for the rear floor frame 22) are the same; 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 also includes a connecting wheel 332, which is hinged at the center of the connecting member 33 and fits the front linkage rod 31 and the rear linkage rod 32 respectively. 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 member 33 is provided with a connecting wheel groove 334 connected to 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 member 33 through a connecting pin 35.

[0061] As one of the specific implementations, 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. It can ensure that the connecting member 33 is centered, prevent the front linkage rod 31 and the rear linkage rod 32 from being stuck relative to the connecting member 33, and thus ensure that the foldable stroller can be smoothly unfolded and folded.

[0062] As one of the specific implementations, the ends of the front linkage rod 31 and the rear linkage rod 32 are both provided with a limit protrusion 37, and in the unfolded state, the limit protrusion 37 abuts against the side of the connecting member 33. This can prevent the front linkage rod 31 or the rear linkage rod 32 from being separated from the connecting member 33, and ensure the reliability of the linkage assembly 3. At the same time, the front linkage rod 31 and the rear linkage rod 32 are equal in length, and the connecting member 33 can be ensured to be centered (even if the connecting wheel 332 is not a gear). The connecting wheel 332 is a structure in which a gear cooperates with the linkage tooth 34. A toothless section is provided at one end of the linkage tooth 34 close to the limiting protrusion 37 [not shown in the accompanying drawings]. There are no teeth on the toothless section. The length of the toothless section is set to a certain distance [such as the distance of a linkage tooth 34] just after folding. Then the linkage tooth 34 engages with the connecting wheel 332. In the unfolded state, the linkage teeth 34 are separated from the connecting wheel 332 respectively and are centered by relying on the limiting protrusion 37. Moreover, the two linkage teeth 34 are completely disengaged from the connecting wheel 332. The position of the connecting wheel 332 can be slightly adjusted to make its rotation angle accurate, so that the linkage tooth 34 engages with the two linkage teeth 34 at approximately the same time in the process from the unfolded state to the folded state, which can ensure that the connecting member 33 is centered in both the unfolded state and the folded state.

[0063] As one of the specific embodiments, the foldable stroller further includes 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 of the locking plug 4 is larger to prevent it from falling from between 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 that the folded state of the foldable stroller is stable. The locking plug 4 can be pulled out from between the front linkage rod 31 and the rear linkage rod 32 to achieve unlocking, and locking and unlocking are relatively convenient.

[0064] The second embodiment is as follows.

[0065] The foldable stroller of the second embodiment is mainly different from the foldable stroller of the first embodiment in that the reinforcement member 36 is provided.

[0066] like Fig.13 , 14 As shown, the reinforcing member 36 of the second embodiment is cylindrical and 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 stroller of the third embodiment is mainly different from the foldable stroller of the first embodiment in the bottom plate frame assembly 2 .

[0069] like Fig.15 As shown, the bottom plate frame assembly 2 of the third embodiment also includes a middle bottom plate frame 25 in the shape of a rectangular frame (for example, four straight rods are fixedly connected head to tail in sequence to form a rectangular frame, and it is easy to understand that the middle part of the rectangular frame is unobstructed), and 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, so that the other end of the front bottom plate frame 21 is indirectly hinged to the other end of the rear bottom plate frame 22, and the front bottom plate frame 21 and the rear bottom plate frame 22 are both vertical in the folded state, and the front bottom plate frame 21 and the rear bottom plate frame 22 are usually overlapped with the column 181 in the side view. It is easy to understand that the lengths of the front bottom plate frame 21 and the rear bottom plate frame 22 are equal, and the front bottom plate frame 21 and the rear bottom plate frame 22 are both vertical in the folded state, so that the middle bottom plate frame 25 is horizontal, and the middle part of the middle bottom plate frame 25 is unobstructed, and at this time, there is a space between the front bottom plate frame 21 and the rear bottom plate frame 22 that can be used to accommodate objects, and the space can be used to accommodate the flexible bag body, etc., which is more convenient.

[0070] The fourth embodiment is as follows.

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

[0072] like Fig.16As shown, the top and / or bottom of the connecting wheel 332 of the fourth embodiment extends outward to form a connecting wheel rim 333, and the connecting wheel rim 333 respectively abuts against the front linkage rod 31 and the rear linkage rod 32. For example, the connecting wheel 332 is cylindrical without teeth, and the connecting wheel rim 333 is disc-shaped. Fig.15 As shown, the connecting wheel 332 is half-cut and has an I-shape, which can improve the torsion resistance (resistance to the twisting force of the front linkage rod 31 and the rear linkage rod 32 on the connecting member 33) and the load-bearing capacity of the connecting member 33.

[0073] The terms first, second, etc. used in the present invention do not indicate any order, quantity or importance, but are only used for distinction.

[0074] As used herein, the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced object.

[0075] Terms indicating orientation or position as used in the present invention, such as top, bottom, side, longitudinal, lateral, middle, center, outside, inside, horizontal, vertical, left, right, above, below, etc., are intended to reflect relative positions rather than absolute positions.

[0076] As used in the present invention, the terms: generally, overall, approximately, close, etc., are limiting terms to indicate that a feature exists but a certain deviation is allowed. The amount of the certain deviation allowed may vary depending on the specific context; for example, the specific context that may depend on the deviation of a dimension includes but is not limited to the relevant standards of the dimension tolerance.

Claims

1. A foldable cart, comprising a function frame assembly (1) and a bottom frame assembly (2); the function frame assembly (1) comprises a front function frame (11) and a rear function frame (12); the front function frame (11) and the rear function frame (12) are both provided with rollers (19); the front function frame (11) and / or the rear function 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 function frame (11), and one end of the rear bottom frame (22) is horizontally hinged to the rear function 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 comprises a linkage assembly (3), wherein the linkage assembly (3) comprises 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, characterized in that: 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, characterized in that: 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 inserted into the connecting groove (331) in a snug manner; 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 inserted into the gaps between the linear sliding rollers in two adjacent rows in a snug manner.

4. The foldable stroller according to claim 1, characterized in that: 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, characterized in that: 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) also includes 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, characterized in that: 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, characterized in that: The ends of the front linkage rod (31) and the rear linkage rod (32) are both provided with limiting protrusions (37), and in the unfolded state, the limiting protrusions (37) abut against the side surfaces of the connecting member (33).

8. The foldable stroller according to claim 1, wherein: It also includes 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, characterized in that: 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 end and / or the bottom end of the connecting wheel (332) extend outward to form a connecting wheel rim (333), and the connecting wheel rim (333) abuts against the front linkage rod (31) and the rear linkage rod (32) respectively.

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