Folding trolley frame and folding trolley

Abstract

The utility model discloses a folding trolley frame and a folding trolley. The folding trolley frame comprises a foldable bottom frame, stand columns arranged at the four corners of the bottom frame, wheels located below the bottom frame and arranged corresponding to the stand columns, two foldable first supports arranged on the front side and the rear side of the bottom frame, and two foldable second supports arranged on the left side and the right side of the bottom frame. The first support and the second support respectively comprise a plurality of connecting rod assemblies, each connecting rod assembly comprises two connecting rods hinged together in a crossed mode, and the hinge point of the two connecting rods deviates from the center point of the two connecting rods, so that the two connecting rods are respectively provided with a first end close to the hinge point and a second end away from the hinge point. The first ends of the two connecting rods of each connecting rod assembly adjacent to the stand column are distributed up and down, one first end is hinged to a first fixing base arranged on the stand column, and the other first end is hinged to a sliding base arranged on the stand column in a sliding mode. The folding chair is large in use volume, low in manufacturing cost and small in size when being folded.

Description

Technical Field

[0001] The utility model relates to the technical field of trolleys, in particular to a foldable trolley frame and a foldable trolley. Background Art

[0002] In people's daily lives, we often need to carry items. In most cases, manual labor is required to carry items to their destination, which is not only time-consuming but also laborious. Therefore, folding trolleys have been invented on the market. To address this situation, a large number of items can be placed on the trolley and pushed or pulled to the destination. Folding trolleys can also be folded, so they do not take up much space when not in use. However, existing folding trolleys have the following problems:

[0003] 1. Current trolleys generally have four columns, on which sliding sleeves are provided, and between which a number of connecting rod assemblies are provided. One end of the connecting rod assembly is fixed, and the other end is hinged to the slide to realize folding and unfolding. However, the connecting rod assemblies are all arranged to bisect the center point. The connecting rod assembly thus constructed appears dull and has a relatively simple appearance and structure without personalized features. Moreover, if the depth of the deep trolley needs to be increased, the length of the connecting rod in the connecting rod assembly needs to be increased. Otherwise, the support of the top of the trolley is poor and items are easy to fall off. However, this method not only increases the cost, but also requires increasing the length of the columns, which makes the height of the trolley higher when folded, thereby making the trolley occupy a larger space when folded.

[0004] 2. Currently, conventional handlebar fixings are all set at the bottom of the frame. If the folded height is limited to a certain height and cannot be lower than another height after unfolding, the pull rod assembly often needs to be set up with a three-stage telescopic structure. The use of a three-stage telescopic structure will increase the cost of the pull rod assembly, make the structure more complicated, and weaken the strength and stability of the pull rod assembly itself.

[0005] 3. The currently commonly used bottom support structure adopts a single bottom cross structure, which is composed of four support rods converging to the center. When the folding trolley is unfolded to a long length, the structural stability of the bottom frame is poor and the strength is low. Utility Model Content

[0006] The utility model aims to solve the technical problems existing in the prior art and provides a foldable trolley frame and a foldable trolley, which have large use volume, low production cost, and small volume when folded, and do not need to occupy a large space.

[0007] The technical solution adopted by the utility model to solve its technical problems is: a foldable cart frame, including a foldable base frame, columns arranged at the four corners of the base frame, wheels located below the base frame and arranged corresponding to the columns, two first brackets arranged on the front and rear sides of the base frame and foldable, and two second brackets arranged on the left and right sides of the base frame and foldable, the first bracket and the second bracket are respectively arranged between two adjacent columns; the first bracket and the second bracket respectively include a plurality of connecting rod assemblies, and the connecting rod assemblies include two connecting rods cross-hinged together, the hinge points of the two connecting rods deviate from the center points of the two connecting rods, so that the two connecting rods respectively have a first end close to the hinge point and a second end away from the hinge point, the first ends of the two connecting rods of each connecting rod assembly adjacent to the column are distributed up and down, and one of the first ends is hinged to the first fixed seat arranged on the column, and the other first end is hinged to the sliding seat slidably arranged on the column; the second ends of adjacent connecting rod assemblies are adjacent to each other and hinged to each other, or the first ends of adjacent connecting rod assemblies are adjacent to each other and hinged to each other.

[0008] Furthermore, the two connecting rods are respectively a long rod and a short rod, and the long rod is longer than the short rod.

[0009] Furthermore, at the first ends of the two connecting rods of the connecting rod assembly adjacent to the column, the first end of the long rod is at the bottom and hinged to the first fixed seat, and the first end of the short rod is at the top and hinged to the sliding seat.

[0010] Furthermore, a pull rod assembly is provided on the front side of the base frame, and the pull rod assembly is connected to two columns on the front side of the base frame.

[0011] Furthermore, the pull rod assembly includes two linkage rods, a telescopic pull rod and a handle, the handle is connected to the top of the telescopic pull rod, the bottom of the telescopic pull rod is connected to a support, one end of the two linkage rods is respectively hinged to the support, and the other end of the two linkage rods is respectively hinged to the second fixed seat arranged on the two columns on the front side of the base frame.

[0012] Furthermore, the telescopic pull rod includes a first pull rod and a second pull rod, the second pull rod is sleeved outside the first pull rod, and one end of the first pull rod is at the top and connected to the handle, and one end of the second pull rod is at the bottom and connected to the support; the second fixed seat is arranged in the middle of the column.

[0013] Furthermore, the chassis includes a plurality of folding frames distributed along the front-to-back direction, each folding frame is X-shaped, and the front ends of the folding frame at the front end of the chassis are respectively hinged to the third fixed seats provided on the two columns on the front side of the chassis, and the rear ends of the folding frame at the rear end of the chassis are respectively hinged to the third fixed seats provided on the two columns on the rear side of the chassis; the opposite ends of adjacent folding frames are respectively hinged to a middle connecting piece; the middle connecting piece is hinged to the first end or the second end of the connecting rod assembly adjacent to it.

[0014] Furthermore, the folding frame includes a connecting seat and four support rods, one end of the four support rods is hinged to the connecting seat, and each support rod can be flipped up and down relative to the connecting seat; the other ends of the four support rods correspond to the four ends of the X shape.

[0015] Furthermore, it also includes a telescopic rod, which is slidably connected to the top end of the column.

[0016] The present invention further provides a folding trolley, comprising a box body and a folding trolley frame as described in any one of the above, wherein the box body is detachably connected to the interior of the folding trolley frame.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention abandons the traditional center point bisection method and adopts a connecting rod assembly including two connecting rods cross-hinged together. The hinge point of the two connecting rods deviates from the center point of the two connecting rods, so that the two connecting rods respectively have a first end close to the hinge point and a second end away from the hinge point, thereby making the frame appearance structure unique. In addition, this structure can increase the depth of the unfolded frame without increasing the length of the connecting rod, increase the usable volume of the cart, and reduce the manufacturing cost; and the shorter first ends of the two connecting rods of each connecting rod assembly adjacent to the column are connected to the column, which can relatively shorten the length of the column, thereby reducing the volume of the frame when folded and reducing the space occupied by the frame.

[0019] 2. The two connecting rods are respectively a long rod and a short rod, and of the first ends of the two connecting rods of the connecting rod assembly adjacent to the column, the first end of the long rod is at the bottom and hinged to the first fixed seat, and the first end of the short rod is at the top and hinged to the sliding seat, thereby increasing the depth of the frame after unfolding and the usable volume of the trolley while shortening the length of one of the connecting rods, further reducing the manufacturing cost.

[0020] 3. The pull rod assembly includes two linkage rods, a telescopic pull rod and a handle. The handle is connected to the top of the telescopic pull rod, and the bottom of the telescopic pull rod is connected to a support. One end of the two linkage rods is hinged to the support respectively, and the other end of the two linkage rods is hinged to the second fixed seats provided on the two columns on the front side of the base frame respectively, and the second fixed seat is provided in the middle of the column, so that the design of the three-stage telescopic structure in the existing technology can be abandoned, the cost of the pull rod assembly can be reduced, and the strength and stability of the pull rod assembly can be increased.

[0021] 4. The chassis includes a plurality of folding frames distributed along the front-to-back direction, and each folding frame is in an X-shape, so that the chassis structure is stable and has good strength.

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments; however, the folding trolley frame and the folding trolley of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention (in the unfolded state);

[0024] Figure 2 This is a front view of the first embodiment of the present utility model (in the unfolded state);

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention (during the folding process);

[0026] Figure 4 This is a front view of the first embodiment of the present invention (during the folding process);

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention (folded state);

[0028] Figure 6 This is a front view of the first embodiment of the present invention (folded state);

[0029] Figure 7 This is a schematic diagram of the three-dimensional structure of the second embodiment of the present invention (in the unfolded state);

[0030] Figure 8 This is the main view of the second embodiment of the present utility model (expanded state);

[0031] Figure 9 This is a schematic diagram of the three-dimensional structure of the second embodiment of the present invention (folded state);

[0032] Figure 10 This is a front view of the second embodiment of the present invention (folded state);

[0033] In the figure: 10, first bracket; 20, second bracket; 30, column; 40, base frame; 50, wheel; 1, connecting rod assembly; 11, long rod; 12, short rod; 111 / 121, first end; 112 / 122, second end; 2, first fixed seat; 3, slide seat; 4, folding frame; 41, connecting seat; 42, support rod; 5, third fixed seat; 6, pull rod assembly; 61, linkage rod; 62, first pull rod; 63, second pull rod; 64, handle; 65, support; 66, second fixed seat; 7, middle connecting piece; 8, telescopic rod; 9, cloth fixing assembly; 91, cloth fixing seat; 92, fixing knob. DETAILED DESCRIPTION

[0034] In the present invention, the terms "first", "second", etc. are only used to distinguish similar objects, rather than to describe a specific order or precedence, and cannot be understood as indicating or implying relative importance. In the description, the directions or positional relationships indicated by "upper", "lower", "left", "right", "front", "back", "inside", "outside", "top", "bottom", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] In addition, in the description of the present invention, unless otherwise specified, "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be a communication between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Example 1

[0037] See Figures 1-6As shown, a foldable trolley frame of the present invention includes a foldable base frame 40, columns 30 arranged at the four corners of the base frame 40, wheels 50 located below the base frame 40 and arranged corresponding to the columns 30, two first brackets 10 arranged on the front and rear sides of the base frame 40 and foldable, and two second brackets 20 arranged on the left and right sides of the base frame 40 and foldable, the first bracket 10 and the second bracket 20 being respectively arranged between two adjacent columns 30. The first bracket 10 and the second bracket 20 each include a plurality of connecting rod assemblies 1, each of which includes two connecting rods cross-hinged together, the hinge point of the two connecting rods offset from the center point of the two connecting rods, so that the two connecting rods respectively have a first end close to the hinge point and a second end away from the hinge point. The first ends of the two connecting rods of each connecting rod assembly 1 adjacent to the column 30 are distributed up and down, and one of the first ends is hinged to the first fixed seat 2 provided on the column 30, and the other first end is hinged to the sliding seat 3 slidably provided on the column 30. The second ends of adjacent connecting rod assemblies 1 are arranged adjacent to each other and hinged to each other, or the first ends of adjacent connecting rod assemblies 1 are arranged adjacent to each other and hinged to each other, that is, the second ends of the two connecting rods of one connecting rod assembly 1 are hinged one by one with the second ends of the two connecting rods of the other connecting rod assembly 1, or the first ends of the two connecting rods of one connecting rod assembly 1 are hinged one by one with the first ends of the two connecting rods of the other connecting rod assembly 1.

[0038] In this embodiment, the first bracket 10 includes two connecting rod assemblies 1 , and the second bracket 20 includes four connecting rod assemblies 1 .

[0039] Specifically, the two connecting rods are a long rod 11 and a short rod 12, respectively. The long rod 11 is longer than the short rod 12. The long rod 11 has a first end 111 near the hinge point and a second end 112 away from the hinge point. The short rod 12 has a first end 121 near the hinge point and a second end 122 away from the hinge point. In adjacent connecting rod assemblies 1, the second end 112 of the long rod 11 of one connecting rod assembly 1 is hinged to the second end 112 of the long rod 11 of the other connecting rod assembly 1, and the second end 122 of the short rod 12 of one connecting rod assembly 1 is hinged to the second end 122 of the short rod 12 of the other connecting rod assembly 1. Alternatively, the first end 111 of the long rod 11 of one connecting rod assembly 1 is hinged to the first end 111 of the long rod 11 of the other connecting rod assembly 1, and the first end 121 of the short rod 12 of one connecting rod assembly 1 is hinged to the first end 121 of the short rod 12 of the other connecting rod assembly 1.

[0040] In this embodiment, at the first ends of the two connecting rods of the connecting rod assembly 1 adjacent to the column 30, the first end 111 of the long rod 11 is at the bottom and hinged to the first fixed seat 2, and the first end 121 of the short rod 12 is at the top and hinged to the sliding seat 3. That is, in all connecting rod assemblies 1, the first end 111 of the long rod 11 and the second end 122 of the short rod 12 are both at the bottom, and the second end 112 of the long rod 11 and the first end 121 of the short rod 12 are both at the top.

[0041] A pull rod assembly 6 is further provided on the front side of the base frame 40 , and the pull rod assembly 6 is connected to the two columns 30 on the front side of the base frame 40 .

[0042] The rod assembly 6 includes two linkage rods 61, a telescopic rod, and a handle 64. The handle 64 is connected to the top of the telescopic rod, and the bottom of the telescopic rod is connected to a support 65. One end of the two linkage rods 61 is hinged to the support 65, and the other end of the two linkage rods 61 is hinged to the second fixed base 66 provided on the two columns 30 on the front side of the base frame 40. Specifically, the telescopic rod includes a first rod 62 and a second rod 63. The second rod 63 is mounted outside the first rod 62, with one end of the first rod 62 at the top and connected to the handle 64, and one end of the second rod 63 at the bottom and connected to the support 65. The second fixed base 66 is provided in the middle of the column 30.

[0043] The chassis 40 includes multiple folding frames 4 distributed along the front-to-back direction. Specifically, there are two folding frames 4, each folding frame 4 forming an X-shape. The front ends of the folding frames 4 at the front end of the chassis 40 are hinged to third fixing bases 5 provided on the two front columns 30 of the chassis 40. The rear ends of the folding frames 4 at the rear end of the chassis 40 are hinged to third fixing bases 5 provided on the two rear columns 30 of the chassis 40. The opposite ends of adjacent folding frames 4 are hinged to a central connecting member 7. The central connecting member 7 is hinged to the first ends 111 of the long rods 11 of the middle two connecting rod assemblies 1 of the four connecting rod assemblies 1, and the hinge is flush with the first fixing base 2.

[0044] The folding frame 4 includes a connecting base 41 and four supporting rods 42. One end of each of the four supporting rods 42 is hinged to the connecting base 41, and each supporting rod 42 can be flipped up and down relative to the connecting base 41. The other ends of the four supporting rods 42 correspond to the four ends of the X shape.

[0045] The present invention further comprises a telescopic rod 8, which is slidably connected to the top of the column 30. The present invention further comprises a cloth fixing assembly 9 mounted on the top of the telescopic rod 8, the cloth fixing assembly 9 comprising a cloth fixing seat 91 and a fixing knob 92, the cloth fixing seat 91 and the fixing knob 92 being movably connected, and the cloth fixing seat 91 being fixed to the telescopic rod 8.

[0046] When the first bracket 10 and the second bracket 20 are unfolded, the second end 122 of the short rod 12 of one connecting rod assembly 1 is substantially flush with the hinge of the second end 122 of the short rod 12 of the other connecting rod assembly 1 and the first fixing seat 2, as shown in FIG. Figure 1 、 Figure 2 When the first bracket 10 and the second bracket 20 are folded, the second end 122 of the short rod 12 of one connecting rod assembly 1 is substantially flush with the hinged joint of the second end 122 of the short rod 12 of the other connecting rod assembly 1 and the third fixing seat 5, as shown. Figure 5 、 Figure 6 shown.

[0047] The foldable trolley frame of the present invention has a unique appearance and structure. It can increase the depth of the frame after unfolding without increasing the length of the connecting rod, thereby increasing the usable volume of the trolley and reducing the manufacturing cost. In addition, the shorter first ends of the two connecting rods of each connecting rod assembly 1 adjacent to the column 30 are connected to the column 30, which can relatively shorten the length of the column 30, thereby reducing the volume of the frame when folded and reducing the space occupied by the frame.

[0048] The utility model provides a folding trolley, which comprises a box body and the folding trolley frame mentioned above. The box body is detachably connected to the inside of the folding trolley frame.

[0049] The utility model is a folding trolley. Regarding the structure and working principle of the folding trolley frame, please refer to the above description thereof, which will not be repeated here.

[0050] Example 2

[0051] See Figure 7-10 As shown, a folding trolley frame and a folding trolley of the present invention are different from those of the first embodiment in that no telescopic rod is provided at the top of the column 30 , and the cloth fixing assembly 9 is installed at the top of the column 30 .

[0052] In this embodiment, the length of the short rod 12 is shorter than that of the short rod 12 in the first embodiment. When the first bracket 10 and the second bracket 20 are unfolded, the hinge point between the second end 122 of the short rod 12 of one connecting rod assembly 1 and the second end 122 of the short rod 12 of the other connecting rod assembly 1 is higher than the first fixing seat 2. Figure 7 、 Figure 8 When the first bracket 10 and the second bracket 20 are folded, the second end 122 of the short rod 12 of one connecting rod assembly 1 and the second end 122 of the short rod 12 of the other connecting rod assembly 1 are roughly flush with the first fixing seat 2, as shown. Figure 9 、 Figure 10 shown.

[0053] The utility model provides a folding trolley frame and a folding trolley, and the unrelated parts are the same as those in the prior art or can be implemented by adopting the prior art.

[0054] The above embodiments are only used to further illustrate a folding trolley frame and a folding trolley of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the scope of protection of the technical solution of the present invention.

Claims

1. A foldable handcart frame, comprising a foldable base frame, upright posts disposed at four corners of the base frame, wheels located below the base frame and corresponding to the upright posts, two foldable first brackets disposed at the front and rear sides of the base frame, and two foldable second brackets disposed at the left and right sides of the base frame, wherein the first bracket and the second bracket are respectively disposed between two adjacent upright posts; characterized in that: The first bracket and the second bracket respectively include a plurality of connecting rod assemblies, and the connecting rod assembly includes two connecting rods cross-hinged together, and the hinge point of the two connecting rods deviates from the center point of the two connecting rods, so that the two connecting rods respectively have a first end close to the hinge point and a second end away from the hinge point. The first ends of the two connecting rods of each connecting rod assembly adjacent to the column are distributed up and down, and one of the first ends is hinged to a first fixed seat provided on the column, and the other first end is hinged to a sliding seat slidably provided on the column; the second ends of adjacent connecting rod assemblies are adjacent to each other and hinged to each other, or the first ends of adjacent connecting rod assemblies are adjacent to each other and hinged to each other.

2. The foldable trolley frame according to claim 1, characterized in that: The two connecting rods are respectively a long rod and a short rod, and the long rod is longer than the short rod.

3. The foldable trolley frame according to claim 2, characterized in that: Of the first ends of the two connecting rods of the connecting rod assembly adjacent to the column, the first end of the long rod is at the bottom and hinged to the first fixing seat, and the first end of the short rod is at the top and hinged to the sliding seat.

4. The foldable trolley frame according to claim 1, characterized in that: A pull rod assembly is further provided on the front side of the base frame, and the pull rod assembly is connected to two upright posts on the front side of the base frame.

5. The foldable trolley frame according to claim 4, characterized in that: The pull rod assembly includes two linkage rods, a telescopic pull rod and a handle, the handle is connected to the top of the telescopic pull rod, the bottom of the telescopic pull rod is connected to a support, one end of the two linkage rods is hinged to the support, and the other end of the two linkage rods is hinged to the second fixed seat arranged on the two columns on the front side of the base frame.

6. The foldable trolley frame according to claim 5, characterized in that: The telescopic pull rod includes a first pull rod and a second pull rod, the second pull rod is sleeved outside the first pull rod, and one end of the first pull rod is at the top and connected to the handle, and one end of the second pull rod is at the bottom and connected to the support; the second fixing seat is arranged in the middle of the column.

7. The foldable trolley frame according to claim 1, characterized in that: The chassis includes multiple folding frames distributed along the front-to-back direction, and each folding frame is X-shaped. The front ends of the folding frame at the front end of the chassis are respectively hinged to the third fixing seats provided on the two columns on the front side of the chassis, and the rear ends of the folding frame at the rear end of the chassis are respectively hinged to the third fixing seats provided on the two columns on the rear side of the chassis; the opposite ends of adjacent folding frames are respectively hinged to a middle connecting member; the middle connecting member is hinged to the first end or the second end of the connecting rod assembly adjacent to it.

8. The foldable trolley frame according to claim 7, characterized in that: The folding frame includes a connecting seat and four support rods, one end of the four support rods is hinged to the connecting seat, and each support rod can be flipped up and down relative to the connecting seat; the other ends of the four support rods correspond to the four ends of the X shape.

9. The foldable trolley frame according to claim 1, characterized in that: It also includes a telescopic rod, which is slidably connected to the top end of the column.

10. A foldable trolley, comprising a box body, characterized in that: The foldable trolley frame according to any one of claims 1 to 9 is further comprised, wherein the box is detachably connected to the interior of the foldable trolley frame.

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