Handcart with small storage space after being folded

Abstract

The invention relates to a trolley with small storage space after being folded, which comprises four vertical rods, a long edge folding assembly is arranged between any two vertical rods arranged along the length direction of the trolley, a short edge folding assembly is arranged between any two vertical rods arranged along the width direction of the trolley, and the lower ends of the four vertical rods are connected with a bottom folding assembly. A wheel assembly is arranged at the lower end of each vertical rod; the vertical rod comprises a fixed rod and a sliding rod, and the lower portion of the sliding rod is slidably arranged on the upper portion of the fixed rod along the axis of the fixed rod to increase or decrease the length of the vertical rod. The upper ends, close to the vertical rods, of the long-edge folding assemblies on the two sides of any vertical rod and the upper ends, close to the vertical rods, of the short-edge folding assemblies on the two sides of any vertical rod are fixedly hinged to the upper ends of the sliding rods, and the lower ends, close to the vertical rods, of the long-edge folding assemblies on the two sides of any vertical rod and the lower ends, close to the vertical rods, of the short-edge folding assemblies on the two sides of any vertical rod are fixedly hinged to the fixed rods. After the trolley is folded, the height of the whole trolley can be reduced, and a user can store the trolley more conveniently.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of trolleys, in particular to a trolley with small storage space after folding. BACKGROUND

[0002] Outdoor leisure is increasingly popular with people, and as living standards continue to improve, people's longing for and pursuit of nature increase day by day, constantly promoting the development of tourism, and people's demand for camping, outdoor picnic and other outdoor entertainment activities is more urgent. When going out, a large number of articles, food and the like will be carried, and therefore, the folding trolley is a tool widely used at present to facilitate people's daily life.

[0003] The existing trolley with small storage space after folding is usually composed of four vertical rods and folding assemblies connected between two vertical rods, and the height of the folding assemblies after folding or the height after folding will not be higher than the vertical rods. The height of the overall folding trolley depends on the height of the vertical rods, but the vertical rods of the existing trolley with small storage space after folding are usually a whole fixed rod, so the length of the fixed rod determines the height of the trolley with small storage space after folding before and after folding. The height of the trolley is high, which is not conducive to storage. SUMMARY

[0004] The present application provides a trolley with small storage space after folding, and the height of the whole trolley after folding is lower, which is more convenient for users to store.

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

[0006] A trolley with small storage space after folding, comprising four vertical rods, long-side folding assemblies provided between any two vertical rods arranged in the length direction of the trolley, short-side folding assemblies provided between any two vertical rods arranged in the width direction of the trolley, and a bottom folding assembly connected to the lower ends of the four vertical rods, each vertical rod being provided with a wheel assembly at the lower end;

[0007] The vertical rod comprises a fixed rod and a sliding rod, the lower part of the sliding rod being slidably arranged on the upper part of the fixed rod along the axis of the fixed rod to increase or shorten the length of the vertical rod;

[0008] The long-side folding assemblies on both sides of any vertical rod are fixedly hinged to the upper end of the vertical rod and the short-side folding assemblies are fixedly hinged to the upper end of the vertical rod, and the long-side folding assemblies on both sides of any vertical rod are fixedly hinged to the lower end of the vertical rod and the short-side folding assemblies are fixedly hinged to the lower end of the vertical rod;

[0009] The bottom folding assembly is folded upward, the four vertical rods are moved close to each other, the long side folding assembly and the short side folding assembly are folded at the same time, and the sliding rod slides downward along the axis of the fixed rod; after folding, the part of the sliding rod not connected with the long side folding assembly and the short side folding assembly slides into the fixed rod, and the highest point of the folded long side folding assembly and short side folding assembly is not higher than the sliding rod.

[0010] Preferably, a first connecting piece is fixed to the upper end of the sliding rod, the upper end of the long side folding assembly close to the vertical rod and the upper end of the short side folding assembly close to the vertical rod are hinged to the first connecting piece.

[0011] A second connecting piece is arranged on the fixed rod, and the lower end of the long side folding assembly close to the vertical rod and the lower end of the short side folding assembly close to the vertical rod are hinged to the second connecting piece.

[0012] The highest point of the folded long side folding assembly and short side folding assembly is not higher than the first connecting piece.

[0013] Preferably, the long side folding assembly comprises two first folding assemblies and a second folding assembly for connecting the two first folding assemblies.

[0014] The first folding assembly comprises a first connecting rod, a second connecting rod and a third connecting rod.

[0015] The upper end of the first connecting rod is hinged to the first connecting piece on the sliding rod close to the first connecting rod, the lower end of the first connecting rod is hinged to the lower end of the second folding assembly close to the first connecting rod, one end of the second connecting rod is hinged to the second connecting piece on the fixed rod close to the second connecting rod, the other end of the second connecting rod is hinged to the lower end of the first connecting rod, one end of the third connecting rod is hinged to the first connecting rod, and the other end of the third connecting rod is hinged to the upper end of the second folding assembly close to the third connecting rod.

[0016] The length of the first connecting rod is not greater than the distance between the upper end surface of the first connecting piece and the lower end surface of the fixed rod.

[0017] The second connecting piece is arranged on the middle part of the fixed rod, and the length of the second connecting rod is not greater than the distance between the upper end surface of the second connecting piece and the lower end surface of the fixed rod.

[0018] After the folding of the trolley, the highest point of the second folding assembly is not higher than the upper end surface of the first connecting piece, and the lowest point is not lower than the lower end surface of the fixed rod.

[0019] Preferably, the second folding assembly comprises three first X-shaped linkage assemblies connected in sequence; the lower end of the first connecting rod is hingedly connected to the lower end of the adjacent first X-shaped linkage assembly, and the end of the third connecting rod away from the first connecting rod is hingedly connected to the upper end of the adjacent first X-shaped linkage assembly.

[0020] After the trolley is folded, the highest point of the first X-shaped linkage assembly is not higher than the upper end surface of the first connecting member, and the lowest point is not lower than the lower end surface of the fixed rod.

[0021] Preferably, the short side folding assembly comprises two third folding assemblies and a fourth folding assembly for connecting the two third folding assemblies.

[0022] The third folding assembly comprises a fourth connecting rod, a fifth connecting rod and a sixth connecting rod, the upper end of the fourth connecting rod is hingedly connected to the first connecting member on the adjacent sliding rod, the fifth connecting rod is hingedly connected to the second connecting member on the adjacent fixed rod, and one end of the sixth connecting rod is hingedly connected to the fourth connecting rod.

[0023] The fourth folding assembly comprises a second X-shaped linkage assembly, both upper ends of the second X-shaped linkage assembly are hingedly connected to the ends of the two sixth connecting rods away from the hinged joint between the sixth connecting rod and the fourth connecting rod, and both lower ends are hingedly connected to the lower ends of the two fourth connecting rods.

[0024] Preferably, the length of the fourth connecting rod is not greater than the distance between the upper end surface of the first connecting member and the lower end surface of the fixed rod.

[0025] The second connecting member is installed in the middle of the fixed rod, and the length of the fifth connecting rod is not greater than the distance between the upper end surface of the second connecting member and the lower end surface of the fixed rod.

[0026] After the trolley is folded, the highest point of the second X-shaped linkage assembly is not higher than the upper end surface of the first connecting member, and the lowest point is not lower than the lower end surface of the fixed rod.

[0027] Preferably, the bottom folding assembly comprises two fifth folding assemblies arranged in sequence along the length direction of the trolley.

[0028] The distal ends of the two fifth folding assemblies are hingedly connected to the lower ends of the vertical rods on the same side, the proximal ends of the two fifth folding assemblies are hingedly connected, and have two hinged joints, a third connecting member is hingedly connected to each hinged joint, a stabilizing plate is vertically arranged on each third connecting member, and a sliding hole is vertically arranged on the stabilizing plate.

[0029] The two hinge shafts of the second folding assembly extend outside the second folding assembly to form sliding shafts, and the two sliding shafts are correspondingly arranged on the two sliding holes;

[0030] When the trolley is fully unfolded, the sliding shafts are located at the upper end of the sliding hole, and when the trolley is folded, the sliding shafts are located at the lower end of the sliding hole.

[0031] Preferably, the fifth folding assembly comprises four bottom connecting rods and a bottom connecting piece, the four bottom connecting rods are arranged in an X-shaped structure, one end of the bottom connecting rod close to the vertical rod is hingedly connected to the lower end of the vertical rod, the other end is hingedly connected to the bottom connecting piece, one end of the bottom connecting rod away from the vertical rod is hingedly connected to the bottom connecting piece, and the other end of the bottom connecting rod away from the vertical rod in the other fifth folding assembly is hingedly connected to the third connecting piece.

[0032] Preferably, the trolley further comprises a pull rod assembly, the pull rod assembly comprises a pull rod, a mounting piece and two seventh connecting rods, the fourth connecting piece and the fifth connecting piece are arranged on the two fixed rods arranged along the width direction of the trolley, the fourth connecting piece is fixedly arranged on the fixed rod, the fifth connecting piece is hingedly arranged on the fourth connecting piece, one end of the two seventh connecting rods is hingedly arranged on the fifth connecting piece, and the other end is hingedly arranged on the two ends of the mounting piece, the pull rod is arranged on the mounting piece and located between the two seventh connecting rods, and the pull rod can move in the vertical direction of the trolley and rotate in the length direction.

[0033] Preferably, the fourth connecting piece is located at the middle of the fixed rod.

[0034] Compared with the prior art, the present application has the following beneficial effects:

[0035] The vertical rod of the present application is composed of a fixed rod and a sliding rod, and the upper ends of the adjacent long-side folding assembly and short-side folding assembly are connected to the upper end of the sliding rod, so that when the whole vehicle is folded, the sliding rod will slide into the inner cavity of the fixed rod, so that the length of the whole vertical rod will be reduced during the folding process, resulting in a lower height of the whole vehicle, which is more convenient for users to store. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0037] Figure 1The overall expansion schematic view of the trolley of the embodiment in the present application;

[0038] Figure 2 The folding process schematic view of the trolley of the embodiment in the present application;

[0039] Figure 3 The folding completion schematic view of the trolley of the embodiment in the present application;

[0040] Figure 4 The expansion schematic view of the long side folding assembly and the short side folding assembly of the embodiment in the present application;

[0041] Figure 5 The folding completion schematic view of the long side folding assembly and the short side folding assembly of the embodiment in the present application;

[0042] Figure 6 The expansion schematic view of the long side folding assembly of the embodiment in the present application;

[0043] Figure 7 The folding completion schematic view of the long side folding assembly of the embodiment in the present application;

[0044] Figure 8 The folding completion schematic view of the short side folding assembly of the embodiment in the present application;

[0045] Figure 9 The cooperation schematic view of the first connecting rod, the second connecting rod, the fourth connecting rod, the fifth connecting rod and the vertical rod when the trolley of the embodiment in the present application is in the expansion state;

[0046] Figure 10 The vertical rod schematic view of the embodiment in the present application;

[0047] Figure 11 The Figure 10 The enlarged schematic view of A in the embodiment in the present application;

[0048] Figure 12 The first pipe sleeve structure schematic view of the embodiment in the present application;

[0049] Figure 13 The cooperation schematic view of the sliding rod, the first pipe sleeve and the second pipe sleeve of the embodiment in the present application;

[0050] Figure 14 The expansion schematic view of the bottom folding assembly of the embodiment in the present application;

[0051] Figure 15 The expansion schematic view of the pull rod assembly of the embodiment in the present application;

[0052] Figure 16 The folding completion schematic view of the pull rod assembly of the embodiment in the present application;

[0053] Figure 17 The first connecting piece of the embodiment in the present application is shown in the figure;

[0054] Figure 18 The second connecting piece of the embodiment in the present application is shown in the figure Figure 1 ;

[0055] Figure 19 The second connecting piece of the embodiment in the present application is shown in the figure Figure 2 ;

[0056] Figure 20 The sixth connecting piece of the embodiment in the present application is shown in the figure;

[0057] Figure 21 The bottom connecting piece of the embodiment in the present application is shown in the figure Figure 1 ;

[0058] Figure 22 The bottom connecting piece of the embodiment in the present application is shown in the figure Figure 2 ;

[0059] Figure 23 The third connecting piece of the embodiment in the present application is shown in the figure.

[0060] Explanation of reference signs:

[0061] 1, vertical rod; 11, fixed rod; 12, sliding rod; 121, first anti-falling hole; 13, first pipe sleeve; 131, first protrusion; 14, second pipe sleeve; 2, long side folding assembly; 21, first connecting rod; 22, second connecting rod; 23, third connecting rod; 24, first X-shaped connecting rod set; 25, sixth connecting piece; 251, third mounting hole; 252, fifth hinge groove; 253, sixth hinge groove; 3, short side folding assembly; 31, fourth connecting rod; 32, fifth connecting rod; 33, sixth connecting rod; 34, second X-shaped connecting rod set; 35, seventh connecting piece; 4, first connecting piece; 41, first mounting hole; 42, first hinge groove; 43, second hinge groove; 5, second connecting piece; 51, second mounting hole; 52, third hinge groove; 53, fourth hinge groove; 6, bottom folding assembly; 61, fifth folding assembly; 611, bottom connecting rod; 612, bottom connecting piece; 613, bottom hinge groove; 62, third connecting piece; 621, tenth hinge groove; 7, stabilizing plate; 71, sliding hole; 8, pull rod assembly; 81, pull rod; 82, mounting piece; 83, seventh connecting rod; 84, fourth connecting piece; 85, fifth connecting piece; 9, eighth connecting piece; 10, wheel assembly. DETAILED DESCRIPTION

[0062] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0063] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0064] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] The embodiment of the present application provides a handcart with a small storage space after folding, as shown in Figures 1-23 The handcart comprises four vertical rods 1, two long-side folding assemblies 2, two short-side folding assemblies 3, four wheel assemblies 10 and a bottom folding assembly 6. The long-side folding assemblies 2 are arranged between two vertical rods 1 arranged in the length direction of the handcart, the short-side folding assemblies 3 are arranged between two vertical rods 1 arranged in the width direction of the handcart, the bottom folding assembly 6 is arranged at the lower end of the four vertical rods 1, and the four wheel assemblies 10 are arranged below the four vertical rods 1 respectively for supporting the walking of the handcart. The wheel assembly 10 is a universal wheel with a brake. When folding, the bottom folding assembly 6 is operated to move upward, and then drives the four vertical rods 1 to move close to each other, and at the same time, the short-side folding assemblies 3 and the long-side folding assemblies 2 are folded, and finally the folding of the entire vehicle body is completed.

[0066] Among them, as shown in Figure 1 , 9As shown in FIGS. 10, each vertical rod 1 comprises a fixed rod 11 and a sliding rod 12, both of which are hollow tubes, the lower part of the sliding rod 12 in the same vertical rod 1 is arranged on the upper part of the fixed rod 11 along the axis of the fixed rod 11 to increase or shorten the length of the vertical rod 1, that is, when the sliding rod 12 slides upward, the part of the sliding rod 12 outside the fixed rod 11 increases, so that the length of the entire vertical rod 1 increases, when the sliding rod 12 slides downward, the part of the sliding rod 12 outside the fixed rod 11 decreases, so that the length of the entire vertical rod 1 decreases, so that the length of the entire vertical rod 1 increases or shortens; and the long side folding assembly 2 on both sides of any vertical rod 1 close to the upper end of the vertical rod 1 and the short side folding assembly 3 close to the upper end of the vertical rod 1 are fixedly hinged to the upper end of the sliding rod 12, the long side folding assembly 2 on both sides of any vertical rod 1 close to the lower end of the vertical rod 1 and the short side folding assembly 3 close to the lower end of the vertical rod 1 are fixedly hinged to the fixed rod 11; when the trolley is in the unfolded state, the lower end of the sliding rod 12 slides to the upper end of the fixed rod 11, the sliding rod 12 is above the fixed rod 11 except for the lower end, the height of the entire trolley is equal to the length of the fixed rod 11 plus the length of the sliding rod 12 (except for the lower end of the sliding rod 12), during the folding process of the entire trolley, the bottom folding assembly 6 is folded upward, driving the four vertical rods 1 to be close to each other, so that the long side folding assembly 2 and the short side folding assembly 3 are folded at the same time, the sliding rod 12 slides downward along the axis of the fixed rod 11, after folding is completed, the part of the sliding rod 12 not connected to the long side folding assembly 2 and the short side folding assembly 3 slides into the fixed rod 11, that is, the upper end of the sliding rod 12 is above the fixed rod 11, the rest part slides into the inner cavity of the fixed rod 11, and the highest point of the folded long side folding assembly 2 and the short side folding assembly 3 is not higher than the upper end surface of the sliding rod 12, the height of the entire trolley is equal to the length of the fixed rod 11 plus the length of the upper end of the sliding rod 12, although the height of the entire trolley after folding still depends on the height of the vertical rod 1, the height of the vertical rod 1 of the present trolley after folding is obviously lowered, basically by the length of the sliding rod 12 (except for the length of the upper end and the lower end of the sliding rod 12), compared with the existing trolley with unchanged vertical rod 1 height and unchanged height of the trolley before and after folding, the height of the present trolley after folding is lower, so that it can be stored in a relatively lower space, requiring a smaller longitudinal storage space, so that it is more convenient to store, and the volume of the entire trolley after folding is smaller, requiring a smaller storage space.

[0067] Specifically, as Figures 10-13As shown, a first sleeve 13 is installed on the upper end of the fixing rod 11. The upper end of the first sleeve 13 has a flange that contacts the upper surface of the fixing rod 11. The remaining part of the first sleeve 13 is located inside the fixing rod 11. The outer wall of the first sleeve 13 has a U-shaped hole forming an elastic plate. The outer wall of the elastic plate has a first protrusion 131. Correspondingly, the outer wall of the fixing rod 11 has a first anti-detachment hole 121. After the first sleeve 13 is installed, the first protrusion 131 is located within the first anti-detachment hole 121, preventing the first sleeve 13 from detaching from the fixing rod 11 under the influence of the sliding rod 12 during use. The lower end of the rod 12 is fitted with a second sleeve 14. The outer wall of the second sleeve 14 is provided with a U-shaped hole and forms an elastic plate. The inner wall of the elastic plate is provided with a second protrusion. The outer wall of the lower end of the sliding rod 12 is provided with a second anti-drop hole. The second protrusion is set in the second anti-drop hole, so that the second sleeve 14 is installed at the lower end of the sliding rod 12. Moreover, the outer diameter of the second sleeve 14 is equal to the outer diameter of the first sleeve 13. On the one hand, it protects the sliding rod 12 from wear when sliding on the fixed rod 11. On the other hand, it enables the sliding rod 12 to slide stably along the inner hole of the fixed rod 11, making the sliding smoother.

[0068] Specifically, such as Figures 4-5 As shown, a first connecting piece 4 is fixed to the upper end of the sliding rod 12. The upper ends of the long-side folding assembly 2 near the vertical rod 1 and the upper ends of the short-side folding assembly 3 near the vertical rod 1 are both hinged to the first connecting piece 4. Correspondingly, as shown... Figure 17 As shown, the lower end face of the first connector 4 is provided with a first mounting hole 41, and its side end is provided with a first hinge groove 42 and a second hinge groove 43. The first hinge groove 42 and the second hinge groove 43 are arranged perpendicularly. The upper end of the sliding rod 12 is installed in the first mounting hole 41. The upper end of the long side folding component 2 near the vertical rod 1 is hinged to the first hinge groove 42 through a first hinge shaft. The upper end of the short side folding component 3 near the vertical rod 1 is hinged to the second hinge groove 43 through a second hinge shaft. The first hinge shaft and the second hinge shaft are arranged perpendicularly. A second connector 5 is provided on the fixed rod 11. The lower ends of the long side folding component 2 near the vertical rod 1 and the lower ends of the short side folding component 3 near the vertical rod 1 are both hinged to the second connector 5. Correspondingly, as shown... Figures 18-19 As shown, the lower end face of the second connector 5 is provided with a second mounting hole 51, and its side end is provided with a third hinge groove 52 and a fourth hinge groove 53. The third hinge groove 52 and the fourth hinge groove 53 are arranged perpendicularly. The upper end of the sliding rod 12 is installed in the second mounting hole 51. The upper end of the long side folding component 2 near the vertical rod 1 is hinged in the third hinge groove 52 through the third hinge shaft. The upper end of the short side folding component 3 near the vertical rod 1 is hinged in the fourth hinge groove 53 through the fourth hinge shaft. The third hinge shaft and the fourth hinge shaft are arranged perpendicularly. The arrangement of the first connector 4 and the second connector 5 facilitates the connection between the long side folding component 2 and the short side folding component 3 and the vertical rod 1.

[0069] Specifically, as shown in Figures 6-7 The long-side folding assembly 2 comprises two first folding assemblies and a second folding assembly for connecting the two first folding assemblies; the first folding assembly comprises a first connecting rod 21, a second connecting rod 22 and a third connecting rod 23, the upper end of the first connecting rod 21 is hinged to the first hinge groove 42 on the first connecting piece 4 on the sliding rod 12 through a first hinge shaft, the lower end of the first connecting rod 21 is hinged to the lower end of the adjacent second folding assembly, one end of the second connecting rod 22 is hinged to the third hinge groove 52 on the second connecting piece 5 on the fixed rod 11 through a third hinge shaft, and the other end is hinged to the lower end of the first connecting rod 21, one end of the third connecting rod 23 is hinged to the middle part of the first connecting rod 21, and the other end is hinged to the upper end of the adjacent second folding assembly, so that the adjacent vertical rods 1 are close to each other, driving the first connecting rod 21, the second connecting rod 22 and the second connecting rod 23 to rotate, at the same time, the sliding rod 12 slides downward, driving the second folding assembly to fold, so as to complete the folding of the long-side folding assembly; in order to ensure that the height of the long-side folding assembly 2 after folding is not higher than the length of the vertical rod 1 after folding, the length of the first connecting rod 21 is not greater than the distance between the upper end surface of the first connecting piece 4 and the lower end surface of the fixed rod 11, and the second connecting piece 5 is installed in the middle part of the fixed rod 11, the length of the second connecting rod 22 is not greater than the distance between the upper end surface of the second connecting piece 5 and the lower end surface of the fixed rod 11, and the highest point of the second folding assembly after the folding of the trolley is not higher than the upper end surface of the first connecting piece 4, and the lowest point is not lower than the lower end surface of the fixed rod 11, so that the second folding assembly is always located in the area between the connecting piece 4 and the lower end surface of the fixed rod 11, therefore, when the trolley is fully unfolded, the hinge point between the first connecting rod 21 and the second connecting rod 22 and the lowest end of the second folding assembly are located above the fixed rod 11, so that there is a certain distance between the lower end of the entire long-side folding assembly 2 and the lower end surface of the fixed rod 11, thereby forming a reserved movement space, when the entire trolley is folded, the sliding rod 12 slides downward, driving the entire long-side folding assembly 2 to descend into the reserved movement space, after folding, the lower end of the first connecting rod 21 and the lower end of the second folding assembly are flush with the lower end surface of the fixed rod 11, that is, the lower end of the long-side folding assembly 2 is flush with the lower end surface of the fixed rod 11, and will not be lower than the lower end surface of the fixed rod 11, interfering with the approaching of the universal wheels at the lower ends of the two vertical rods 1, thereby avoiding the situation that the folding volume cannot be minimized due to the incomplete folding of the entire trolley, and after folding, the length of the entire trolley in the length direction is shorter and the volume is smaller.

[0070] Moreover, the second folding assembly comprises at least two first X-shaped linkage groups 24, in this embodiment, the second folding assembly comprises three first X-shaped linkage groups 24 connected in sequence, the upper ends of the first X-shaped linkage groups 24 on the two sides are hingedly connected to the ends of the two third connecting rods 23 away from the first connecting rod 21, and the lower ends are hingedly connected to the lower ends of the two first connecting rods 21, and the highest point of the first X-shaped linkage group 24 is not higher than the upper end face of the first connecting piece 4, and the lowest point is not lower than the lower end face of the fixed rod 11, that is, the first X-shaped linkage group 24 is always located in the area between the connecting piece 4 and the lower end face of the fixed rod 11, so that after folding, the folded first X-shaped linkage group 24 will not be higher than the upper end face of the first connecting piece 4, ensuring that the height of the entire folded storage space small stroller will not become larger. Moreover, compared with two first X-shaped linkage groups 24, three first X-shaped linkage groups 24 will shorten the length of the connecting rods in each first X-shaped linkage group 24 under the same length, so that the length of the long side folding assembly can be shorter and the volume can be relatively smaller after the entire vehicle is folded while maintaining the same height.

[0071] Specifically, the first folding assembly is further provided with a sixth connecting piece 25, as shown in Figure 20 The upper end face of the sixth connecting piece 25 is provided with a third mounting hole 251, the side end is provided with a fifth hinge groove 252 and a sixth hinge groove 253, the fifth hinge groove 252 and the sixth hinge groove 253 are arranged in parallel, the lower end of the first connecting rod 21 is installed in the third mounting hole 251, the end of the second connecting rod 22 away from the second connecting piece 5 is hingedly connected in the fifth hinge groove 252 through a fifth hinge shaft, and the lower end of the first X-shaped linkage group 24 close to the vertical rod 1 is hingedly connected in the sixth hinge groove 253 through the sixth hinge groove 253, facilitating folding and rotation between the three rods.

[0072] The specific folding process of the long side folding assembly 2 is as follows: after the two vertical rods 1 are close to each other, the sliding rod 12 slides downward, the lower end of the first connecting rod 21 rotates toward the vertical rod 1, the end of the second connecting rod 22 away from the vertical rod 1 rotates downward, the fifth connecting piece 85 moves downward, and the two connecting rods in the first X-shaped linkage group 24 are folded close to each other, the third connecting rod 23 rotates upward around the hinge joint between the first connecting rod 21 and the third connecting rod 23 and approaches the fixed rod 11, the overall height of the entire long side folding assembly 2 decreases, and finally the first connecting rod 21 and the second connecting rod 22 are both in a vertical state, and the folding is completed, as shown in Figure 12 .

[0073] Specifically, as shown in Figure 4 , 8As shown, the short side folding assembly 3 comprises two third folding assemblies and a fourth folding assembly for connecting the two third folding assemblies; wherein the third folding assembly comprises a fourth connecting rod 31, a fifth connecting rod 32 and a sixth connecting rod 33, the upper end of the fourth connecting rod 31 is hinged with the second hinge slot 43 on the first connecting piece 4 on the sliding rod 12 through a second hinge shaft, the fifth connecting rod 32 is hinged with the fourth hinge slot 53 on the second connecting piece 5 on the fixed rod 11 through a fourth hinge shaft, and one end of the sixth connecting rod 33 is hinged with the middle part of the fourth connecting rod 31; wherein the fourth folding assembly comprises a second X-shaped linkage 34, both upper ends of the second X-shaped linkage 34 are respectively hinged with one end of the sixth connecting rod 33 away from the hinged point between the sixth connecting rod 33 and the fourth connecting rod 31, and both lower ends are respectively hinged with the lower end of the fourth connecting rod 31, specifically, the short side folding assembly 3 is further provided with a seventh connecting piece 35, the seventh connecting piece 35 and the sixth connecting piece 25 are the same structure, the upper end surface of the seventh connecting piece 35 is provided with a fourth mounting hole, the side end is provided with a seventh hinge slot and an eighth hinge slot, the seventh hinge slot and the eighth hinge slot are arranged in parallel, the lower end of the fourth connecting rod 31 is installed in the fourth mounting hole, the end of the fifth connecting rod 32 away from the second connecting piece 5 is hinged in the seventh hinge slot through a seventh hinge shaft, the lower end of the second X-shaped linkage 34 is hinged in the eighth hinge slot through an eighth hinge shaft, the seventh hinge shaft and the eighth hinge shaft are arranged in parallel, which is convenient for folding and rotating between three rods, wherein the sixth connecting piece 25 and the seventh connecting piece 35 are the same structure;Preferably, the length of the fourth connecting rod 31 is not greater than the length of the fixed rod 11, the second connecting piece 5 is installed in the middle of the fixed rod 11, the length of the fifth connecting rod 32 is not greater than the distance between the position of the second connecting piece 5 on the fixed rod 11 and the lower end surface of the fixed rod 11, and the highest point of the second X-shaped connecting rod set 34 is not higher than the upper end surface of the first connecting piece 4 and the lowest point is not lower than the lower end surface of the fixed rod 11 after the stroller is folded, that is, the first X-shaped connecting rod set 24 is always located in the area between the first connecting piece 4 and the lower end surface of the fixed rod 11. Correspondingly, in the unfolded state of the stroller, most of the sliding rod 12 is located above the fixed rod 11, at this time, the lower end of the fourth connecting rod 31 is higher than the lower end surface of the fixed rod 11, and the lower end of the second X-shaped connecting rod set 34 connected with the first connecting rod 21 is also higher than the lower end surface of the fixed rod 11, so that there is a certain distance between the lower end of the entire short side folding assembly 3 and the lower end surface of the fixed rod 11, thereby forming a reserved movement space. When the entire stroller is folded, the sliding rod 12 slides downward, and the entire short side folding assembly 3 is lowered into the reserved movement space through the fourth connecting rod 31. After folding is completed, the lower end of the fourth connecting rod 31 is flush with the lower end surface of the fixed rod 11, the lower end of the second X-shaped connecting rod set 34 is flush with the lower end surface of the fixed rod 11, and the upper end will not be higher than the upper end surface of the first connecting piece 4, that is, the lower end of the entire short side folding assembly 3 will be flush with the lower end surface of the fixed rod 11 and will not be lower than the lower end surface of the fixed rod 11 to interfere with the wheels at the lower ends of the two vertical rods 1 to approach each other, so that the short side folding assembly 3 is more compact after folding, thereby the entire stroller is smaller in width and volume after folding.

[0074] The specific folding process of the short side folding assembly 3 is as follows: after the two vertical rods 1 approach each other, the sliding rod 12 slides downward, the lower end of the fourth connecting rod 31 rotates towards the vertical rod 1, the end of the fifth connecting rod 32 away from the vertical rod 1 rotates downward, the sixth connecting piece 25 moves downward, and the two connecting rods in the second X-shaped connecting rod set 34 approach and fold, the sixth connecting rod 33 rotates upward around the hinge point of the fourth connecting rod 31 and the sixth connecting rod 33 and approaches the fixed rod 11, and the entire short side folding assembly 3 descends as a whole. Finally, the fourth connecting rod 31 and the fifth connecting rod 32 are both in a vertical state, and the folding is completed, as shown in Figure 13 .

[0075] As shown in Figures 3-9As shown, the upper ends of the first connecting rod 21 in the adjacent long-side folding assembly 2 and the fourth connecting rod 31 of the short-side folding assembly 3 are respectively hinged in the first hinge groove 42 and the second hinge groove 43 of the same first connecting piece 4, the second connecting rod 22 and the fifth connecting rod 32 are respectively hinged in the fourth hinge groove 53 and the fifth hinge groove 252 of the same second connecting piece 5, and the folding structure of the first connecting rod 21 and the second connecting rod 22 and the fourth connecting rod 31 and the fifth connecting rod 32 is the same, the first connecting rod 21 corresponds to the fourth connecting rod 31, the second connecting rod 22 corresponds to the fifth connecting rod 32, and in actual design, the lengths are also the same, so that in the folding process of the whole vehicle, the long-side folding assembly 2 and the short-side folding assembly 3 can move downward and fold at the same time, and the cooperation is better; as Figure 9 As shown, and when the first connecting rod 21, the second connecting rod 22, the fourth connecting rod 31 and the fifth connecting rod 32 are folded at the same time, the sliding rod 12 descends at the same time, the lower end portion slides in the fixed rod 11, and finally after the folding is completed, only the end portion of the first connecting piece 4 of the sliding rod 12 is located above the fixed rod 11, and the rest are located in the fixed rod 11, so that the height of the whole vehicle changes from the sum of the heights of the fixed rod 11 and the sliding rod 12 before folding to the height of the fixed rod 11, the height of the whole vehicle after folding is greatly reduced, the required longitudinal storage space is reduced, and storage is more convenient.

[0076] Specifically, as shown in Figure 14 As shown, the bottom folding assembly 6 includes two fifth folding assemblies 61 arranged in sequence along the length direction of the trolley; the fifth folding assembly 61 includes four bottom connecting rods 611 and a bottom connecting piece 612, the four bottom connecting rods 611 are arranged in an X-shaped structure, as shown in Figure 21 , 22As shown, the bottom end surface of the bottom connecting piece 612 is provided with four bottom hinge grooves 613, one end of the two bottom connecting rods 611 close to the vertical rod 1 is respectively hinged to the lower end of the corresponding two vertical rods 1, the other end is respectively hinged to the two bottom hinge grooves 613 of the bottom connecting piece 612, one end of the two bottom connecting rods 611 away from the vertical rod 1 is respectively hinged to the other two bottom hinge grooves 613 of the bottom connecting piece 612, the other end is hinged to the other end of the two bottom connecting rods 611 away from the vertical rod 1 in the other fifth folding assembly 61, so that the two bottom connecting pieces 612 can be moved upward, the two bottom connecting pieces 612 will drive the fixed rods 11 in the four vertical rods 1 to move close to each other, thereby driving the long side folding assembly 2 and the short side folding assembly 3 to be folded at the same time, and the sliding rod 12 slides downward, and finally the folding is completed; Specifically, the bottom of the fixed rod 11 is provided with an eighth connecting piece 9, the eighth connecting piece 9 is provided with a fifth mounting hole, the eighth connecting piece 9 is sleeved on the lower end of the fixed rod 11 through the fifth mounting hole, and the outer side of the eighth connecting piece 9 is provided with a ninth hinge groove, and the end of the corresponding bottom connecting piece 612 is hinged in the ninth hinge groove.

[0077] Wherein the bottom folding assembly 6 further comprises a third connecting piece 62, the two bottom connecting rods 611 away from the vertical rod 1 of the fifth folding assembly 61 are respectively hinged to the two third connecting pieces 62, as shown in Figure 23 As shown, the upper end surface of the third connecting piece 62 is provided with two tenth hinge grooves 621, the two tenth hinge grooves 621 are arranged at an angle, and the two bottom connecting rods 611 close to each other are respectively hinged in the two tenth hinge grooves 621 of the same third connecting piece 62, so that the rotation of the bottom connecting rods 611 close to each other in the two fifth folding assemblies 61 is more smooth; And because the length of the long side folding assembly 2 is longer after being unfolded, it has three X-shaped linkage groups inside, so the folding center may swing left and right during folding, so that the folding process is not smooth, therefore a stabilizing plate 7 is vertically arranged on each third connecting piece 62, the stabilizing plate 7 is vertically provided with a sliding hole 71, correspondingly, the hinge shafts of the two first X-shaped linkage groups 24 extend to the outside of the first X-shaped linkage group 24 to form sliding shafts, the two sliding shafts are correspondingly and slidingly arranged on the two sliding holes 71, during the folding of the trolley, the hinge points of the first X-shaped linkage group 24 can only slide in the vertical direction along the sliding hole 71, so that the folding center of the long side folding assembly 2 does not swing left and right during folding, ensuring that it is stable and smooth, and during folding, because the sliding rod 12 slides vertically downward, the overall height of the long side folding assembly 2 will decrease, so that during actual use, when the trolley is fully unfolded, the sliding shaft is located at the upper end of the sliding hole 71, and after the trolley is folded, the sliding shaft is located at the lower end of the sliding hole 71.

[0078] In order to realize the pulling and pushing function of the trolley, as shown in Figure 1 , 15 , the trolley further comprises a pull rod assembly 8, the pull rod assembly 8 comprises a pull rod 81, a mounting piece 82 and two seventh connecting rods 83, wherein the fourth connecting piece 84 and the fifth connecting piece 85 are arranged on each of the two fixed rods 11 arranged along the width direction of the trolley, that is, the fourth connecting piece 84 and the fifth connecting piece 85 are arranged on the two fixed rods 11 at the front side of the trolley, wherein the fourth connecting piece 84 is arranged with a sixth mounting hole, the fourth connecting piece 84 is mounted on the fixed rod 11 through the sixth mounting hole, and the fourth connecting rod 31 is arranged with an eleventh hinged groove, the lower end of the fifth connecting piece 85 is hinged in the eleventh hinged groove through an eleventh hinged shaft, so that the fifth connecting piece 85 can rotate in the length direction of the trolley, the upper end of the fifth connecting piece 85 is arranged with a twelfth hinged groove, and the two seventh connecting rods 83 are hinged in the two twelfth hinged grooves through two twelfth hinged shafts respectively at one end close to the vertical rod 1, and the other end is hinged at both ends of the mounting piece 82, the seventh connecting rod 83 can rotate in the width direction of the trolley, wherein the pull rod 81 is mounted on the mounting piece 82 and located between the two seventh connecting rods 83, so that the pull rod 81 can rotate in the length direction of the trolley and move in the vertical direction, so that when the whole trolley is folded, the vertical rods 1 on both sides of the pull rod 81 are close to each other, so that the one end of the seventh connecting rod 83 away from the vertical rod 1 rotates downward, so as to drive the whole pull rod 81 to move downward correspondingly, and finally the seventh connecting rod 83 moves to the vertical state, completing the folding of the pull rod 81; preferably, the fourth connecting piece 84 is located in the middle of the fixed rod 11, in the unfolded state of the whole trolley, the height of the lower end of the pull rod 81 is at the middle of the fixed rod 11, the mounting piece 82 is away from the lower end surface of the fixed rod 11 by a certain distance, and there is a space reserved for the downward movement of the pull rod 81, so that when the whole trolley is folded, the pull rod 81 moves downward, the mounting piece 82 moves downward, and finally after the folding is completed, the mounting piece 82 moves to the position of the lower end surface of the fixed rod 11, so that the mounting piece 82 will not move to between the two wheels, avoiding interference with the close of the two wheel assemblies 10, so that the movement between the four vertical rods 1 is not in place, and there is a space, so that the whole trolley cannot reach the minimum size after being folded; the pull rod 81 generally comprises an inner rod and an outer rod, in this embodiment, the inner rod is too long, so that the lower end of the inner rod is located between the two wheels, and of course, the more preferred way is to shorten the length of the inner rod, after the pull rod 81 is folded, the inner rod is still located in the outer rod and will not extend below the mounting piece 82, so that the inner rod will not be located between the two wheels.

[0079] Of course, there is a more preferred way, the length of the seventh connecting rod 83 is less than the distance between the hinge point between the fifth connecting piece 85 and the seventh connecting rod 83 and the lower end surface of the fixed rod 11, so that after folding is completed, the mounting piece 82 will be located above the lower end surface of the fixed rod 11, so as to further avoid the mounting piece 82 moving to the vicinity of the two universal wheels, and the adjacent two universal wheels are further avoided. The situation of folding occurs.

[0080] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and substitutions made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A handcart with a small storage space when folded, characterized in that, It includes four vertical rods, with a long-side folding assembly between any two vertical rods along the length of the trolley, and a short-side folding assembly between any two vertical rods along the width of the trolley. The lower ends of the four vertical rods are connected to a bottom folding assembly, and each vertical rod has a wheel assembly at its lower end. The vertical rod includes a fixed rod and a sliding rod. The lower part of the sliding rod is slidably disposed on the upper part of the fixed rod along the axis of the fixed rod to increase or decrease the length of the vertical rod. The long side folding assembly on both sides of any one of the vertical rods near the upper end of the vertical rod and the short side folding assembly near the upper end of the vertical rod are fixedly hinged to the upper end of the sliding rod; the long side folding assembly on both sides of any one of the vertical rods near the lower end of the vertical rod and the short side folding assembly near the lower end of the vertical rod are fixedly hinged to the fixed rod. The bottom folding assembly folds upward, causing the four vertical rods to move closer together, so that the long side folding assembly and the short side folding assembly fold simultaneously, and the sliding rod slides downward along the axis of the fixed rod. Once folding is complete, the portion of the sliding rod not connected to the long-side folding assembly and the short-side folding assembly slides into the fixed rod, and the highest point of the folded long-side folding assembly and the short-side folding assembly is not higher than the sliding rod.

2. The handcart according to claim 1, characterized in that, The upper end of the sliding rod is fixed with a first connector, and the upper end of the long side folding assembly near the vertical rod and the upper end of the short side folding assembly near the vertical rod are both hinged to the first connector. The fixed rod is provided with a second connector, and the lower ends of the long side folding assembly near the vertical rod and the lower ends of the short side folding assembly near the vertical rod are both hinged to the second connector; The highest point of the folded long-side folding assembly and the folded short-side folding assembly is not higher than the first connector.

3. The handcart according to claim 2, characterized in that, The long-side folding assembly includes two first folding assemblies and a second folding assembly for connecting the two first folding assemblies; The first folding assembly includes a first connecting rod, a second connecting rod, and a third connecting rod. The upper end of the first connecting rod is hinged to the first connecting piece on the adjacent sliding rod, the lower end of the first connecting rod is hinged to the lower end of the adjacent second folding assembly, one end of the second connecting rod is hinged to the second connecting piece on the adjacent fixed rod, and the other end is hinged to the lower end of the first connecting rod, and one end of the third connecting rod is hinged to the first connecting rod, and the other end is hinged to the upper end of the adjacent second folding assembly. The length of the first connecting rod is not greater than the distance between the upper end face of the first connecting member and the lower end face of the fixed rod; The second connector is installed in the middle of the fixed rod, and the length of the second connector is not greater than the distance between the upper end face of the second connector and the lower end face of the fixed rod. After the trolley is folded, the highest point of the second folding component is not higher than the upper surface of the first connector, and the lowest point is not lower than the lower surface of the fixing rod.

4. The handcart according to claim 3, characterized in that, The second folding assembly includes three first X-shaped linkage groups connected in sequence; the lower end of the first connecting rod is hinged to the lower end of the adjacent first X-shaped linkage group, and the end of the third connecting rod away from the first connecting rod is hinged to the upper end of the adjacent first X-shaped linkage group. When the trolley is folded, the highest point of the first X-shaped linkage group is not higher than the upper end face of the first connector, and the lowest point is not lower than the lower end face of the fixed rod.

5. The handcart according to claim 3, characterized in that, The short-side folding assembly includes two third folding assemblies and a fourth folding assembly for connecting the two third folding assemblies; The third folding assembly includes a fourth connecting rod, a fifth connecting rod, and a sixth connecting rod. The upper end of the fourth connecting rod is hinged to the first connecting member on the adjacent sliding rod. The fifth connecting rod is hinged to the second connecting member on the adjacent fixed rod. One end of the sixth connecting rod is hinged to the fourth connecting rod. The fourth folding assembly includes a second X-shaped linkage group, the two upper ends of which are respectively hinged to the ends of the two sixth connecting rods away from the hinge point between the sixth connecting rod and the fourth connecting rod, and the two lower ends are respectively hinged to the lower ends of the two fourth connecting rods.

6. The handcart according to claim 5, characterized in that, The length of the fourth connecting rod is not greater than the length of the fixed rod; The second connector is installed in the middle of the fixed rod, and the length of the fifth connector is not greater than the distance between the position of the second connector on the fixed rod and the lower end face of the fixed rod; When the trolley is folded, the highest point of the second X-shaped linkage group is not higher than the upper end face of the first connector, and the lowest point is not lower than the lower end face of the fixed rod.

7. The handcart according to claim 3, characterized in that, The bottom folding assembly includes two fifth folding assemblies arranged sequentially along the length of the trolley. The two fifth folding components are hinged at opposite ends to the lower end of the vertical rod on the same side, and the two fifth folding components are hinged at adjacent ends and have two hinge points. A third connector is hinged at each hinge point, and a stabilizing plate is vertically provided on each third connector. The stabilizing plate has a sliding hole vertically provided. The hinge shafts of the two second folding components extend to the outside of the second folding components to form sliding shafts, and the two sliding shafts are correspondingly slidably disposed on the two sliding holes; When the trolley is fully unfolded, the sliding shaft is located at the upper end of the sliding hole; when the trolley is folded, the sliding shaft is located at the lower end of the sliding hole.

8. The handcart according to claim 7, characterized in that, The fifth folding assembly includes four bottom connecting rods and a bottom connector. The four bottom connecting rods are arranged in an X-shape. One end of the bottom connecting rod closest to the vertical rod is hinged to the lower end of the vertical rod, and the other end is hinged to the bottom connector. One end of the bottom connecting rod furthest from the vertical rod is hinged to the bottom connector, and the other end is hinged to the third connector.

9. The handcart according to claim 1, characterized in that, It also includes a pull rod assembly, which includes a pull rod, a mounting member, and two seventh connecting rods. Each of the two fixed rods, which are arranged along the width direction of the handcart, is provided with a fourth connecting member and a fifth connecting member. The fourth connecting member is fixedly installed on the fixed rod, and the fifth connecting member is hinged to the fourth connecting member. One end of each of the two seventh connecting rods is hinged to the fifth connecting member, and the other end is hinged to both ends of the mounting member. The pull rod is installed on the mounting member and located between the two seventh connecting rods. The pull rod can move in the vertical direction and rotate in the length direction of the handcart.

10. The handcart according to claim 9, characterized in that, The fourth connector is located in the middle of the fixed rod.

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