Trolley convenient to fold

Abstract

The utility model relates to the technical field of trolleys, in particular to a trolley convenient to fold, which comprises a bottom frame capable of being folded and unfolded, a front wheel, two side rods, two U-shaped top frames, two rear wheels, two rear wheel supporting rods and four linkage rods, and the bottom frame comprises a front U-shaped bottom frame and a rear U-shaped bottom frame; the bottom ends of the two side rods are rotationally connected with the outer sides of the two supporting arms of the front U-shaped bottom frame respectively, the top ends of the two side rods are rotationally connected with the two free ends of one U-shaped top frame respectively, and the top ends of the two rear wheel supporting rods are rotationally connected with the two free ends of the other U-shaped top frame respectively. The middle upper parts of the two side rods are rotationally connected with the middle upper parts of the two rear wheel supporting rods in a crossed manner respectively; the two supporting arms of one U-shaped top frame and the middles of the two rear wheel supporting rods rotate through linkage rods, and the two supporting arms of the other U-shaped top frame and the middles of the two side rods rotate through linkage rods. The bottom frame directly supports an object, the bearing capacity is high, the structure is simplified, and the heavier the object is, the more stable the flattening of the bottom frame is.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of trolley technology, especially a trolley convenient to fold. BACKGROUND

[0002] With the continuous improvement of people's quality of life, in the rest day after work, many people choose outdoor camping, picnic or enjoy sunbathing on the beach. People usually take various tools and articles (such as cookware, sunshades, food, tents, drinking water, etc.) to the vicinity of the destination by car (because the destination is generally a place with many people or original ecology, so it is not possible to drive directly into it), and then take various tools and articles to the destination. In order to facilitate the handling of tools and articles, when the car is near the destination, a trolley / outdoor vehicle is generally used to carry tools and articles to the destination.

[0003] The trolleys in the prior art have various styles and different structures. In the existing patent, the Chinese patent document with application number 202322812191.9 discloses a foldable outdoor vehicle, which includes a main frame and wheels, the main frame includes a front wheel frame and a rear wheel frame that are hingedly connected, a support arm connected between the front wheel frame and the rear wheel frame; a support lock rod assembly capable of controlling the folding and unfolding of the trolley is rotatably arranged between the main frame; the front wheel frame includes a front wheel arm and a front main rod that can be folded with each other, and the rear wheel frame includes a rear wheel arm and a rear main rod that can be folded with each other; two or more U-shaped tubes are rotatably arranged on the main frame. Although the outdoor vehicle of the patent document can be folded for easy storage, the support lock rod assembly is located on both sides of the outdoor vehicle, and the bottom of the outdoor vehicle is completely hollow, so the overall structure of the outdoor vehicle is not stable enough, the overall structure of the vehicle body has low strength, the support lock rod assembly is easily folded unintentionally, making the unfolded use of the outdoor vehicle unstable, and a storage rack that only bears the load and does not participate in the folding process is needed to support the articles, making the structure complex. Therefore, the defects are very obvious, and a solution is urgently needed. UTILITY MODEL CONTENT

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a trolley convenient to fold.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A folding stroller comprises a bottom frame, a front wheel, two side rods, two U-shaped top frames, two rear wheels, two rear wheel supporting rods and four linkage rods. The bottom frame can be folded and flattened. The bottom frame comprises a front U-shaped bottom frame and a rear U-shaped bottom frame. Two free ends of the front U-shaped bottom frame are rotatably arranged with two free ends of the rear U-shaped bottom frame respectively. The front wheel is arranged on the closed end of the front U-shaped bottom frame. The two U-shaped top frames can be a front U-shaped top frame and a rear U-shaped top frame respectively. The bottom ends of the two side rods are rotatably connected with the outer sides of the two arms of the front U-shaped bottom frame respectively. The top ends of the two side rods are rotatably connected with the two free ends of one U-shaped top frame (the rear U-shaped top frame) respectively. The two rear wheels are arranged on the bottom ends of the two rear wheel supporting rods respectively. The top ends of the two rear wheel supporting rods are rotatably connected with the two free ends of the other U-shaped top frame (the front U-shaped top frame) respectively. The middle and upper portions of the two side rods are crosswise rotatably connected with the middle and upper portions of the two rear wheel supporting rods respectively. The two arms of one U-shaped top frame (the rear U-shaped top frame) and the middle portions of the two rear wheel supporting rods are rotatably connected via linkage rods. The two arms of the other U-shaped top frame (the front U-shaped top frame) and the middle portions of the two side rods are rotatably connected via linkage rods. The middle and lower portions of the two rear wheel supporting rods are rotatably connected with the outer sides of the two arms of the rear U-shaped bottom frame respectively.

[0007] Further, the bottom frame further comprises two adapter joints. The two adapter joints are arranged on the two free ends of the front U-shaped bottom frame respectively. The two free ends of the rear U-shaped bottom frame are rotatably connected with the two adapter joints respectively. At least one adapter joint is provided with a locking mechanism for locking or unlocking the rear U-shaped bottom frame.

[0008] Further, the two end bottom surfaces of the adapter joint are upwardly concave with an insertion slot and a rotating slot. One free end of the front U-shaped bottom frame is inserted into the insertion slot. One free end of the rear U-shaped bottom frame extends into the rotating slot and can rotate in the rotating slot. When the top wall of the rotating slot and the free end of the rear U-shaped bottom frame are in contact, the front U-shaped bottom frame and the rear U-shaped bottom frame are unfolded and coplanar.

[0009] Further, the locking mechanism comprises a base arranged on the side wall of the adapter joint and a locking pin movably arranged on the base. The side wall of the adapter joint is provided with a guide hole in communication with the rotating slot. One arm of the rear U-shaped bottom frame is provided with a locking hole in communication with the guide hole. The locking pin is slidably connected with the guide hole. When the guide hole and the locking hole are in communication, the locking pin can be inserted into the locking hole.

[0010] Further, the base is located on the inner side wall of the adapter joint.

[0011] Further, the two arms of the front U-shaped bottom frame and the two arms of the rear U-shaped bottom frame are both provided with reinforcing rods.

[0012] Further, the folding stroller further comprises a push-pull rod. The push-pull rod is arranged on the middle portion of the closed end of the front U-shaped bottom frame via an adapter seat. The push-pull rod can rotate relative to the adapter seat and stay at any angle.

[0013] Further, the number of front wheels is two, the distance between the two front wheels is less than the distance between the two rear wheels; the push-pull rod is located between the two front wheels.

[0014] Further, the diameter of the front wheels is less than the diameter of the rear wheels; the front wheels are universal wheels, and the rear wheels are directional wheels.

[0015] Further, at least one U-shaped top frame is provided with a foldable sun canopy.

[0016] The utility model discloses beneficial effects: in practical application, when the trolley is in the unfolded state, the bottom frame is flat, the front U-shaped bottom frame and the rear U-shaped bottom frame are flat and coplanar, a side rod and a rear wheel support rod form the cross expansion side support, with the cross expansion of side support, the linkage rod on the side rod supports one U-shaped top frame, the side rod on the rear wheel support rod supports another U-shaped top frame, the two U-shaped top frames are flat and coplanar, the two U-shaped top frames are supported through four linkage rods, the stability of the two U-shaped top frames is guaranteed, the locking mechanism locks the rear U-shaped bottom frame on the adapter joint, so that the bottom frame and the whole trolley are in the stable flat state. When the trolley needs to be folded, the locking mechanism releases the locking of the rear U-shaped bottom frame, applies the upward pulling force to the adapter joint, so that the adapter joint rotates relative to the rear U-shaped bottom frame, so that the rear U-shaped bottom frame and the front U-shaped bottom frame gradually close and fold, with the closing and folding of the rear U-shaped bottom frame and the front U-shaped bottom frame, the side support composed of the side rod and the rear wheel support rod will also gradually fold together, and drive the front wheels and the rear wheels to close to each other to fold together, and with the folding of the side support, the linkage rod will swing adaptively, and pull the corresponding U-shaped top frame to fold, so that one U-shaped top frame closes to the side rod to fold together, and another U-shaped top frame closes to the rear wheel support rod to fold together, and the push-pull rod and the corresponding U-shaped top frame fold together, so that the whole trolley is completely folded. When the trolley needs to be unfolded for use, only the downward force is applied to the adapter joint, the trolley can be gradually unfolded, and when the trolley is completely unfolded, the locking mechanism locks the rear U-shaped bottom frame and the adapter joint together, so that the trolley is stably unfolded. The bottom frame of the structure design not only facilitates the folding or unfolding of the trolley, but also can directly support the articles carried by the trolley, has high carrying capacity, simplifies the structure of the trolley, stably unfolds the trolley, and has high overall structural strength; when the trolley is unfolded for use, the bottom frame carries articles, the adapter joint (the folding and rotating position of the bottom frame) of the bottom frame is located in the middle of the bottom frame, and the articles are pressed on the adapter joint, so the rotating joint is not easy to be pulled upward, so within the carrying capacity of the bottom frame, the heavier the weight of the articles, the more stable the flatness of the bottom frame, so that the unfolding of the trolley is more firm, and the trolley is not easy to deform or fold unintentionally. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is a three-dimensional structure schematic view of the utility model in a half-folded state.

[0018] Fig. 2 is a three-dimensional structure schematic view of the utility model in a half-folded state.

[0019] Fig. 3 is a three-dimensional structure schematic view of the utility model in a completely folded state.

[0020] Fig. 4 is an exploded structure schematic view of the front U-shaped chassis, locking mechanism and rear U-shaped chassis of the utility model.

[0021] Mark explanation:

[0022] 1, bottom frame; 2, push-pull rod; 3, side rod; 4, U-shaped top frame; 5, front wheel; 6, rear wheel; 7, rear wheel support rod; 8, linkage rod; 9, front U-shaped chassis; 10, rear U-shaped chassis; 11, adapter joint; 12, locking mechanism; 13, plug-in slot; 14, rotating slot; 15, base; 16, lock pin; 17, guide hole; 18, lock hole; 19, reinforcing rod; 20, adapter seat; 21, sunroof. Specific implementation

[0023] In order to facilitate the understanding of those skilled in the art, the utility model is further explained below in combination with examples and drawings, and the content mentioned in the implementation manner is not a limitation of the utility model.

[0024] As Figs. 1 to 4As shown, the utility model provides a kind of folding trolley, it includes bottom frame 1, push-pull rod 2, two side poles 3, two U-shaped top frame 4, two front wheels 5, two rear wheels 6, two rear wheel support rods 7 and four linkage rods 8, two U-shaped top frame 4 can be called respectively front U-shaped top frame and rear U-shaped top frame, bottom frame 1 can be folded and flatten, bottom frame 1 includes front U-shaped top frame 9, rear U-shaped top frame 10 and two adapter joints 11, two adapter joints 11 are respectively equipped in two free ends of front U-shaped top frame 9, two free ends of rear U-shaped top frame 10 are respectively connected with two adapter joints 11 rotationally, at least one adapter joint 11 is provided with locking mechanism 12, locking mechanism 12 is used to lock or unlock rear U-shaped top frame 10;The bottom end of push-pull rod 2 and two front wheels 5 are equipped in the closed end of front U-shaped top frame 9, and push-pull rod 2 is located between two front wheels 5;The bottom end of two side poles 3 is respectively connected with the rotation of the two arms outside of front U-shaped top frame 9, and the top end of two side poles 3 is respectively connected with the rotation of two free ends of one U-shaped top frame 4 (rear U-shaped top frame);Two rear wheels 6 are respectively equipped in the bottom end of two rear wheel support rods 7, and the top end of two rear wheel support rods 7 is respectively connected with the rotation of two free ends of another U-shaped top frame 4 (front U-shaped top frame);The middle upper portion of two side poles 3 is respectively connected with the rotation of the middle upper portion of two rear wheel support rods 7 in cross mode;The two arms of one U-shaped top frame 4 (rear U-shaped top frame) and the middle portion of two rear wheel support rods 7, the two arms of another U-shaped top frame 4 (front U-shaped top frame) and the middle portion of two side poles 3 are all connected with the rotation of linkage rod 8;The middle lower portion of two rear wheel support rods 7 is respectively connected with the rotation of the two arms outside of rear U-shaped top frame 10.

[0025] In practical application, when the trolley is in unfolded state, the bottom frame 1 is flattened, the front U-shaped bottom frame 9 and the rear U-shaped bottom frame 10 are flattened and coplanar, one side rod 3 and one rear wheel supporting rod 7 form a cross unfolded side support, with the cross unfolding of the side support, the linkage rod 8 on the side rod 3 supports one U-shaped top frame 4, the side rod 3 on the rear wheel supporting rod 7 supports the other U-shaped top frame 4, the two U-shaped top frames 4 are flattened and coplanar, the two U-shaped top frames 4 are supported by the four linkage rods 8, the stability of the two U-shaped top frames 4 being flattened is ensured, the locking mechanism 12 locks the rear U-shaped bottom frame 10 on the adapter joint 11, so that the bottom frame 1 and the whole trolley are in a stable and flattened state. When it is needed to fold the trolley, the locking mechanism 12 releases the locking of the rear U-shaped bottom frame 10, an upward pulling force is applied to the adapter joint 11, so that the adapter joint 11 rotates relative to the rear U-shaped bottom frame 10, thereby the rear U-shaped bottom frame 10 and the front U-shaped bottom frame 9 gradually approach and fold, with the folding of the rear U-shaped bottom frame 10 and the front U-shaped bottom frame 9, the side support composed of the side rod 3 and the rear wheel supporting rod 7 will also gradually fold together, and the front wheel 5 and the rear wheel 6 will also approach each other to fold together, and with the folding of the side support, the linkage rod 8 will swing adaptively and pull the corresponding U-shaped top frame 4 to fold, so that one U-shaped top frame 4 approaches the side rod 3 to fold together, the other U-shaped top frame 4 approaches the rear wheel supporting rod 7 to fold together, and the push-pull rod 2 and the corresponding U-shaped top frame 4 fold together, thereby the whole trolley is completely folded. When it is needed to unfold the trolley for use, only a downward force is applied to the adapter joint 11, the trolley can be gradually unfolded, and when the trolley is completely unfolded, the locking mechanism 12 locks the rear U-shaped bottom frame 10 and the adapter joint 11 together, so that the trolley is stably unfolded. The bottom frame 1 designed in this structure not only facilitates the folding or unfolding of the trolley, but also can directly support the articles carried by the trolley, has strong carrying capacity, simplifies the structure of the trolley, stably unfolds the trolley, and has high overall structural strength; when the trolley is unfolded for use, the bottom frame 1 carries articles, the adapter joint 11 (the folding and rotating position of the bottom frame 1) of the bottom frame 1 is located in the middle of the bottom frame 1, and the articles are pressed on the adapter joint 11, so the rotating joint is not easy to be pulled upward, therefore, within the carrying capacity of the bottom frame 1, the heavier the weight of the articles is, the more stable the bottom frame 1 is flattened, thereby the unfolding of the trolley is more firm, and the trolley is not easy to deform or fold unintentionally.

[0026] Specifically, the push-pull rod 2 is a telescopic rod, which is convenient for adjusting the length of the push-pull rod 2 to meet the use of users of different heights.

[0027] In the embodiment, the bottom surface of the two ends of the adapter joint 11 is concave upward to form an inserting groove 13 and a rotating groove 14 in communication with the inserting groove 13, one free end of the front U-shaped chassis 9 is inserted into the inserting groove 13, and one free end of the rear U-shaped chassis 10 extends into the rotating groove 14 and can rotate in the rotating groove 14; when the top wall of the rotating groove 14 abuts against the free end of the rear U-shaped chassis 10, the front U-shaped chassis 9 and the rear U-shaped chassis 10 are unfolded and coplanar.

[0028] When the front U-shaped chassis 9 and the rear U-shaped chassis 10 are folded, the rotating groove 14 provides a rotating space for the rotation of the rear U-shaped chassis 10, which is conducive to the compact folding of the front U-shaped chassis 9 and the rear U-shaped chassis 10, and reduces the volume of the folded trolley. When the front U-shaped chassis 9 and the rear U-shaped chassis 10 are unfolded, the top wall of the rotating groove 14 abuts against the free end of the rear U-shaped chassis 10 to block and position the rear U-shaped chassis 10, which ensures the stability of the unfolded bottom frame 1, and as the weight of the objects carried by the bottom frame 1 increases, the objects will press the adapter joint 11 downward, which makes the unfolding of the bottom frame 1 more stable.

[0029] In the embodiment, the locking mechanism 12 includes a base 15 arranged on the side wall of the adapter joint 11 and a locking pin 16 movably arranged on the base 15, the side wall of the adapter joint 11 is provided with a guide hole 17 in communication with the rotating groove 14, one arm of the rear U-shaped chassis 10 is provided with a locking hole 18 in communication with the guide hole 17, and the locking pin 16 is slidably connected with the guide hole 17; when the guide hole 17 and the locking hole 18 are communicated, the locking pin 16 can be inserted into the locking hole 18; specifically, the locking pin 16 can be an elastic latch, and the base 15 is in the shape of U or N.

[0030] In actual application, when the trolley is unfolded, the bottom frame 1 is unfolded, the front U-shaped chassis 9 and the rear U-shaped chassis 10 are unfolded and coplanar, the guide hole 17 and the locking hole 18 are communicated, and at this time the locking pin 16 is inserted into the locking hole 18 to lock the adapter joint 11 and the rear U-shaped chassis 10 together, so that the bottom frame 1 is stably in the unfolded state; when the trolley needs to be folded, the locking pin 16 is pulled out of the locking hole 18, and an upward lifting force is applied to the adapter joint 11, so that the rear U-shaped chassis 10 can rotate relative to the adapter joint 11, thereby folding the front U-shaped chassis 9 and the rear U-shaped chassis 10, and the front wheel 5 and the rear wheel 6 are also folded together.

[0031] In the embodiment, the base 15 is located on the inner side wall of the adapter joint 11, so that the locking mechanism 12 is located on the inner side of the bottom frame 1, thereby making the structure compact, preventing the locking mechanism 12 from being exposed and occupying space or colliding with external structures, and preventing the trolley from being folded due to the misoperation of the locking mechanism 12.

[0032] In the embodiment, the reinforcing rods 19 are arranged between the two arms of the front U-shaped chassis 9 and between the two arms of the rear U-shaped chassis 10. The arrangement of the reinforcing rods 19 not only strengthens the front U-shaped chassis 9 and the rear U-shaped chassis 10 and prolongs the service life, but also increases the weight (carrying capacity) of the articles that the trolley can carry.

[0033] In the embodiment, the push-pull rod 2 is arranged in the middle of the closed end of the front U-shaped chassis 9 via the adapter 20, and the push-pull rod 2 can rotate relative to the adapter 20 and stop at any angle. The structure design can adjust the angle of the push-pull rod 2 at will, and facilitates the user to push and pull the trolley through the push-pull rod 2.

[0034] In the embodiment, the distance between the two front wheels 5 is less than the distance between the two rear wheels 6. When folding, the front wheels 5 are accommodated between the two rear wheels 6, so that the structure of the folded trolley is compact, which is beneficial to reduce the occupied space.

[0035] In the embodiment, the diameter of the front wheels 5 is less than the diameter of the rear wheels 6, so that the structure of the folded trolley is compact, which is beneficial to reduce the occupied space, and the front wheels 5 are universal wheels and the rear wheels 6 are directional wheels, which facilitates the trolley to turn and improves the passing ability of the trolley in various road conditions.

[0036] In the embodiment, at least one U-shaped top frame 4 is provided with a foldable sunshade 21. When the sunshade 21 is unfolded, it can shade the articles carried by the trolley and prevent wind and rain; when the sunshade 21 is folded, it is convenient to take and place the articles carried by the trolley, and it is also convenient to store the trolley.

[0037] Specifically, the trolley convenient to fold further comprises a foldable trolley cloth, which is arranged around the edges of the bottom frame and the edges of the two U-shaped top frames.

[0038] All the technical features in the embodiment can be freely combined according to actual needs.

[0039] The above embodiments are the preferred implementation schemes of the utility model, in addition to this, the utility model can be realized in other ways, and any obvious replacement without departing from the technical scheme concept is within the protection scope of the utility model.

Claims

1. A foldable handcart, characterized in that: The system includes a base frame (1), front wheels (5), two side rods (3), two U-shaped top frames (4), two rear wheels (6), two rear wheel support rods (7), and four linkage rods (8). The base frame (1) can be folded and flattened. The base frame (1) includes a front U-shaped base frame (9) and a rear U-shaped base frame (10). The two free ends of the front U-shaped base frame (9) are rotatably connected to the two free ends of the rear U-shaped base frame (10). The front wheels (5) are mounted on the closed end of the front U-shaped base frame (9). The bottom ends of the two side rods (3) are rotatably connected to the outer sides of the two arms of the front U-shaped base frame (9), and the top ends of the two side rods (3) are connected to a U-shaped top frame (4). The two free ends are rotatably connected; the two rear wheels (6) are respectively installed at the bottom ends of the two rear wheel support rods (7), and the top ends of the two rear wheel support rods (7) are rotatably connected to the two free ends of another U-shaped top frame (4); the middle and upper parts of the two side rods (3) are rotatably connected to the middle and upper parts of the two rear wheel support rods (7) respectively; the two arms of one U-shaped top frame (4) are rotatably connected to the middle parts of the two rear wheel support rods (7), and the two arms of the other U-shaped top frame (4) are rotatably connected to the middle parts of the two side rods (3) via linkage rods (8); the middle and lower parts of the two rear wheel support rods (7) are rotatably connected to the outer sides of the two arms of the rear U-shaped bottom frame (10).

2. The foldable handcart according to claim 1, characterized in that: The base frame (1) also includes two transition joints (11), which are respectively installed on the two free ends of the front U-shaped base frame (9). The two free ends of the rear U-shaped base frame (10) are respectively rotatably connected to the two transition joints (11). At least one transition joint (11) is provided with a locking mechanism (12), which is used to lock or unlock the rear U-shaped base frame (10).

3. A foldable handcart according to claim 2, characterized in that: The bottom surfaces of both ends of the adapter joint (11) are recessed with insertion slots (13) and rotation slots (14). One free end of the front U-shaped base frame (9) is inserted into the insertion slot (13), and one free end of the rear U-shaped base frame (10) extends into the rotation slot (14) and can rotate within the rotation slot (14). When the top wall of the rotation slot (14) abuts against the free end of the rear U-shaped base frame (10), the front U-shaped base frame (9) and the rear U-shaped base frame (10) unfold to be coplanar.

4. A foldable handcart according to claim 3, characterized in that: The locking mechanism (12) includes a base (15) disposed on the side wall of the transition joint (11) and a locking pin (16) movably disposed on the base (15). The side wall of the transition joint (11) is provided with a guide hole (17) communicating with the rotating groove (14). One arm of the rear U-shaped base frame (10) is provided with a locking hole (18) corresponding to the guide hole (17). The locking pin (16) is slidably connected to the guide hole (17). When the guide hole (17) communicates with the locking hole (18), the locking pin (16) can be inserted into the locking hole (18).

5. A foldable handcart according to claim 4, characterized in that: The base (15) is located on the inner wall of the transition joint (11).

6. A foldable handcart according to claim 1, characterized in that: A reinforcing bar (19) is provided between the two arms of the front U-shaped base frame (9) and between the two arms of the rear U-shaped base frame (10).

7. A foldable handcart according to claim 1, characterized in that: The foldable trolley also includes a push-pull rod (2), which is mounted on the closed end of the front U-shaped base (9) via an adapter (20). The push-pull rod (2) can rotate relative to the adapter (20) and stay at any angle.

8. A foldable handcart according to claim 1, characterized in that: There are two front wheels (5), and the distance between the two front wheels (5) is less than the distance between the two rear wheels (6).

9. A foldable handcart according to claim 8, characterized in that: The diameter of the front wheel (5) is smaller than that of the rear wheel (6); the front wheel (5) is a swivel wheel, and the rear wheel (6) is a fixed wheel.

10. A foldable handcart according to claim 1, characterized in that: At least one U-shaped roof frame (4) is equipped with a foldable awning (21).

Images