Frame structure of folding cart

Abstract

The utility model discloses a frame structure of a folding cart, which is characterized by comprising a bottom frame, front vertical rods are respectively arranged at two ends of the front end of the bottom frame, rear vertical rods are respectively arranged at two ends of the rear end of the bottom frame, folding supports are arranged between the two front vertical rods and between the two rear vertical rods, and the bottom frame comprises a connecting seat. Four supporting assemblies are arranged on the connecting base in a surrounding mode, each supporting assembly comprises an upper supporting rod, a supporting rod and a lower supporting rod which are arranged side by side, the upper supporting rods, the supporting rods and the lower supporting rods are all rotationally connected with the connecting base, clamping blocks capable of moving up and down are arranged in the connecting base, and when the bottom frame is in an open state, the supporting rods and the lower supporting rods are matched with the clamping blocks in a clamping mode; the automatic locking device has the advantages that after the bottom frame is unfolded, the supporting rods and the lower supporting rods are automatically clamped on the clamping blocks, the bottom frame is automatically locked, the bottom frame can be completely unfolded in place, locking can be unlocked by pulling the clamping blocks to move upwards, and operation is convenient and fast.

Description

Technical Field

[0001] The utility model relates to a folding cart, in particular to a frame structure of the folding cart. Background Art

[0002] A foldable cart is a foldable and towable cargo carrier. It is easy to use, can carry goods, is easy to store, and saves time and effort. It is widely used in moving things and is now often used in outdoor activities or short-distance transportation.

[0003] For example, a reinforced structure of an electric folding cart with publication number CN221605831U includes: a folding body, the folding body includes an end bracket assembly, a side bracket assembly, and a bottom bracket assembly, the two ends of the bottom bracket assembly are respectively rotatably connected to the end bracket assemblies at the corresponding ends, and the bottom bracket assembly can be gathered toward the middle.

[0004] In the structure of the above-mentioned cart, the structure of the bottom bracket is generally a middle connecting block and four connecting rods rotatably connected thereto. The four connecting rods can be gathered together. When the bottom bracket is in an open state, the middle connecting block and the connecting rods may not be able to reach a fully expanded state. The bottom bracket cannot be fully expanded and the middle connecting block may bulge, affecting the use of the cart. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a frame structure of a folding cart, which can be automatically locked after the bottom frame is opened.

[0006] The technical solution adopted by the utility model to solve the above-mentioned technical problems is as follows: the frame structure of the folding cart includes a base frame, the two ends of the front end of the base frame are respectively provided with front uprights, the two ends of the rear end of the base frame are respectively provided with rear uprights, and a folding bracket is provided between the two front uprights and between the two rear uprights. The base frame includes a connecting seat, and four groups of support components are arranged around the connecting seat. The support component includes an upper support rod, a support rod and a lower support rod arranged side by side, and the upper support rod, the support rod and the lower support rod are all rotatably connected to the connecting seat, and a clamping block that can move up and down is provided in the connecting seat. When the base frame is in an open state, the support rod and the lower support rod are clamped and matched with the clamping block.

[0007] A further preferred solution of the utility model is that a first clamping surface and a second clamping surface are provided on the clamping block, and when the base frame is in an open state, the end of the support rod is clamped and matched with the first clamping surface, and the end of the lower support rod is clamped and matched with the second clamping surface.

[0008] A further preferred solution of the utility model is that a pull rod is arranged on the clamping block, the top end of the pull rod extends out of the connecting seat, and the pull rod is pulled to drive the clamping block to move upward so that the clamping block is disengaged from the supporting rod and the lower supporting rod.

[0009] A further preferred solution of the utility model is: a return spring is arranged between the clamping block and the connecting seat, the return spring is sleeved on the pull rod, and two ends of the return spring are respectively placed on the clamping block and the connecting seat.

[0010] A further preferred solution of the utility model is that a pull rope is arranged at the top end of the pull rod.

[0011] A further preferred solution of the utility model is: three connection holes for connecting the upper support rod, the support rod and the lower support rod are opened on the connection seat, and the three connection holes are arranged obliquely.

[0012] A further preferred solution of the utility model is that a rotation groove is provided on the connecting seat, and the ends of the upper support rod, the supporting rod and the lower support rod are arranged in the rotation groove and can move in the rotation groove.

[0013] A further preferred solution of the utility model is: a slide groove is provided in the connecting seat, and the clamping block is arranged in the slide groove and can move up and down in the slide groove.

[0014] Compared with the prior art, the advantage of the utility model is that the base frame includes a connecting seat, four groups of support components are arranged around the connecting seat, the support components include an upper support rod, a support rod and a lower support rod arranged side by side, the upper support rod, the support rod and the lower support rod are all rotatably connected to the connecting seat, and a clamping block that can move up and down is arranged in the connecting seat. When the base frame is in an open state, the support rod and the lower support rod are engaged with the clamping block. When the base frame is unfolded, the support rod and the lower support rod are automatically clamped on the clamping block, so that the base frame is self-locked, so that the base frame can be fully unfolded into place, and the lock can be released by pulling the clamping block upward, which is convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0016] Figure 1 is a schematic diagram of the cart in the open state;

[0017] Figure 2 It is a schematic diagram of the cart in the gathered state;

[0018] Figure 3 It is a schematic diagram of a base frame in a preferred embodiment of the utility model;

[0019] Figure 4 It is a partial cross-sectional view of the base frame in the preferred embodiment of the utility model;

[0020] Figure 5 It is a schematic diagram of a connecting seat in a preferred embodiment of the utility model;

[0021] Figure 6 It is a schematic diagram of a card block in a preferred embodiment of the utility model.

[0022] In the figure: 1. base frame; 11. connecting seat; 12. upper support rod; 13. support rod; 14. lower support rod; 15. rotating groove; 16. connecting hole; 17. clamping block; 18. first clamping surface; 19. second clamping surface; 110. pull rod; 111. slide groove; 112. return spring; 2. front vertical rod; 21. front wheel; 3. rear vertical rod; 31. rear wheel; 4. handle; 5. bracket; 6. hinge seat; 61. hinge hole. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0024] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0025] The frame structure of the folding cart includes a base frame 1, front uprights 2 are respectively arranged at the two ends of the front end of the base frame 1, rear uprights 3 are respectively arranged at the two ends of the rear end of the base frame 1, and folding brackets are arranged between the two front uprights 2 and between the two rear uprights 3.

[0026] A front wheel 21 is disposed at the bottom of the front upright pole 2, and a rear wheel 31 is disposed at the bottom of the rear upright pole 3. The front wheel 21 is a universal wheel structure and is used for steering the cart.

[0027] A handle 4 is also provided at the front end of the base frame 1, and the handle 4 is convenient for a user to pull or push the cart.

[0028] The folding bracket comprises two X-shaped brackets 5 , one side of the two brackets 5 is hinged to each other, and the other side of the two brackets 5 is hinged to the two front upright poles 2 or the two rear upright poles 3 respectively.

[0029] Each front upright pole 2 and each rear upright pole 3 is provided with an articulated seat 6 , and the base frame 1 is hinged to each articulated seat 6 .

[0030] The base frame 1 includes a connecting seat 11, on which four groups of supporting components are arranged around, and the supporting components include an upper support rod 12, a support rod 13 and a lower support rod 14 arranged side by side, and the upper support rod 12, the support rod 13 and the lower support rod 14 are all rotatably connected to the connecting seat.

[0031] The upper support rod 12, the support rod 13 and the lower support rod 14 can enhance the overall strength of the base frame 1, so that the base frame 1 has better load-bearing properties.

[0032] A rotation groove 15 is formed on the connecting seat 11 , and ends of the upper support rod 12 , the supporting rod 13 and the lower support rod 14 are arranged in the rotation groove 15 and can move in the rotation groove 15 .

[0033] The connecting seat 11 is provided with three connecting holes 16 for connecting the upper support rod 12, the support rod 13 and the lower support rod 14, and the three connecting holes 16 are arranged obliquely. At the same time, the hinge seat 6 is provided with three hinge holes 61 for connecting the upper support rod 12, the support rod 13 and the lower support rod 14, and the three hinge holes 61 are arranged obliquely. The inclination direction and angle formed by the three connecting holes 16 are exactly the same as the inclination direction and angle formed by the three hinge holes 61. In this way, the upper support rod 12, the support rod 13 and the lower support rod 14 can rotate at the same time, and the three can always remain in a parallel state.

[0034] A clamping block 17 that can move up and down is arranged in the connecting seat 11 . When the base frame 1 is in the open state, the supporting rod 13 and the lower supporting rod 14 are engaged with the clamping block 17 .

[0035] Furthermore, the block 17 is provided with a first engaging surface 18 and a second engaging surface 19 . When the base frame 1 is in the open state, the end of the support rod 13 abuts against the first engaging surface 18 , and the end of the lower support rod 14 abuts against the second engaging surface 19 .

[0036] A slide groove 111 is defined in the connecting seat 11 , and the clamping block 17 is disposed in the slide groove 111 and can move up and down in the slide groove 111 .

[0037] A pull rod 110 is provided on the clamping block 17 , and the top end of the pull rod 110 extends out of the connecting seat 11 . Pulling the pull rod 110 drives the clamping block 17 to move upward so that the clamping block 17 is disengaged from the supporting rod 13 and the lower supporting rod 14 .

[0038] A pull rope is provided at the top of the pull rod 110 , and the pull rope facilitates the user to pull the pull rod 110 .

[0039] A return spring 112 is provided between the block 17 and the connecting seat 11 . The return spring 112 is used for rebounding and returning the block 17 . The return spring 112 is sleeved on the pull rod 110 , and two ends of the return spring 112 are respectively placed on the block 17 and the connecting seat 11 .

[0040] The trolley is in the open state, and the support rod 13 and the lower support rod 14 are opposite to the first clamping surface 18 and the second clamping surface 19 respectively. At this time, when the connecting seat 11 is pulled, the support rod 13 and the lower support rod 14 will be against the first clamping surface 18 and the second clamping surface 19, and the upper support rod 12, the support rod 13 and the lower support rod 14 will not be able to rotate.

[0041] When the cart needs to be folded, the pull rod 110 is pulled, and the pull rod 110 drives the clamping block 17 to move upward, so that the first clamping surface 18 and the second clamping surface 19 leave the relative position with the support rod 13 and the lower support rod 14. In addition, when the pull rod 110 is pulled, the connecting seat 11 is also driven to move upward. When the connecting seat 11 moves upward, it also drives the upper support rod 12, the support rod 13 and the lower support rod 14 to rotate, thereby realizing the folding of the cart.

[0042] When opening the cart, press the connecting seat 11 downward to move it downward. When the connecting seat 11 moves downward, the support rod 13 and the lower support rod 14 are respectively clamped into the first clamping surface 18 and the second clamping surface 19 until the connecting seat 11 moves to the lowest position. The support rod 13 and the lower support rod 14 are respectively arranged opposite to the first clamping surface 18 and the second clamping surface 19.

[0043] In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0044] The frame structure of the folding stroller provided by the utility model is introduced in detail above. The principle and implementation method of the utility model are explained in this article by using specific examples. The description of the above embodiments is only used to help understand the utility model and its core idea. It should be pointed out that for ordinary technicians in this technical field, the utility model can also be improved and modified without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. The frame structure of the folding cart is characterized by: The invention comprises a base frame, wherein the two ends of the front end of the base frame are respectively provided with front upright poles, the two ends of the rear end of the base frame are respectively provided with rear upright poles, and a folding bracket is provided between the two front upright poles and between the two rear upright poles. The base frame comprises a connecting seat, and four groups of supporting components are arranged around the connecting seat. The supporting components comprise an upper support rod, a support rod and a lower support rod arranged side by side, and the upper support rod, the support rod and the lower support rod are all rotatably connected with the connecting seat, and a clamping block which can be moved up and down is arranged in the connecting seat, and when the base frame is in an open state, the support rod and the lower support rod are clamped and matched with the clamping block.

2. The frame structure of the folding stroller according to claim 1, characterized in that: The clamping block is provided with a first clamping surface and a second clamping surface. When the base frame is in an open state, the end of the support rod is clamped and matched with the first clamping surface, and the end of the lower support rod is clamped and matched with the second clamping surface.

3. The frame structure of the folding stroller according to claim 1, characterized in that: A pull rod is arranged on the clamping block, and the top end of the pull rod extends out of the connecting seat. The pull rod is pulled to drive the clamping block to move upward so that the clamping block is disengaged from the supporting rod and the lower supporting rod.

4. The frame structure of the folding stroller according to claim 3, characterized in that: A return spring is arranged between the clamping block and the connecting seat. The return spring is sleeved on the pull rod, and two ends of the return spring are respectively placed on the clamping block and the connecting seat.

5. The frame structure of the folding stroller according to claim 3, characterized in that: A pull rope is arranged on the top end of the pull rod.

6. The frame structure of the folding stroller according to claim 1, characterized in that: The connection seat is provided with three connection holes for connecting the upper support rod, the support rod and the lower support rod, and the three connection holes are arranged obliquely.

7. The frame structure of the folding stroller according to claim 1, characterized in that: The connecting seat is provided with a rotation groove, and the ends of the upper support rod, the supporting rod and the lower support rod are arranged in the rotation groove and can move in the rotation groove.

8. The frame structure of the folding stroller according to claim 1, characterized in that: A slide groove is provided in the connecting seat, and the clamping block is arranged in the slide groove and can move up and down in the slide groove.

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