Trolley

Abstract

A trolley is provided with a trolley frame and a cloth bag, parallelograms are respectively formed among a front upper cross brace, a front lower cross brace, a front support and a middle vertical rod and among a rear upper cross brace, a rear lower cross brace, a rear support and the middle vertical rod in side supports on each side of the trolley frame, the two parallelograms share the middle vertical rod, and the side support on each side further comprises a front pull rod and a rear pull rod. One end part of the front pull rod and one end part of the rear pull rod are respectively pivoted with the middle vertical rod, the other end part of the front pull rod can be arranged on the front upper cross arm, the front lower cross arm or the front bracket in a sliding and rotating manner, and the other end part of the rear pull rod can be arranged on the rear upper cross arm, the rear lower cross arm or the rear bracket in a sliding and rotating manner. The stroller frame can be controlled to be folded front and back or unfolded front and back by controlling the middle vertical rod upwards or downwards, operation is convenient and fast, the folded stroller frame is neat and flat in shape, and storage is convenient.

Description

Technical Field

[0001] The utility model belongs to the field of baby carriages, in particular to a handcart. Background Art

[0002] As life becomes more and more abundant, outdoor camping becomes more and more popular. As more and more people go camping, there are more and more types of camping supplies. People carry more items when camping, and people usually use carts to carry items.

[0003] When the trolley is not in use, it occupies a large space and is inconvenient to carry, so some foldable trolleys have appeared on the market. However, the existing foldable trolleys have the technical problems of complex folding and inconvenient use.

[0004] Therefore, designing a trolley that is easy to fold and easy to operate is a market demand. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a trolley.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a trolley, including a trolley frame with an unfolded state and a folded state, and a cloth bag arranged on the trolley frame, the trolley frame includes side brackets on left and right sides, and a locking mechanism, each side bracket includes an intermediate vertical rod; a front bracket and a rear bracket are respectively arranged on the front and rear sides of the intermediate vertical rod, in the folded state, the front bracket and the rear bracket are respectively close to the intermediate vertical rod, and in the unfolded state, the front bracket and the rear bracket are correspondingly unfolded, a front wheel assembly is installed at the bottom of the front bracket, and a rear wheel assembly is installed at the bottom of the rear bracket Parts; the front upper cross brace and the front lower cross brace are respectively arranged one above and one below between the front bracket and the middle vertical rod, and the rear upper cross brace and the rear lower cross brace are respectively arranged one above and one below between the rear bracket and the middle vertical rod; the front pull rod and the rear pull rod, one end of the front pull rod and one end of the rear pull rod are respectively pivotally connected to the middle vertical rod, the other end of the front pull rod is slidably and rotatably mounted on the front upper cross brace, the front lower cross brace or the front bracket, and the other end of the rear pull rod is slidably and rotatably mounted on the rear upper cross brace, the rear lower cross brace or the rear bracket. In the side brackets on each side, the front bracket and the rear bracket are respectively arranged on the front and rear sides of the middle vertical rod, the front upper cross brace and the front lower cross brace are respectively arranged one above and one below between the front bracket and the middle vertical rod, forming a parallelogram, and the rear upper cross brace and the rear lower cross brace are respectively arranged one above and one below between the rear bracket and the middle vertical rod, also forming a parallelogram, and the two parallelograms share the middle vertical rod.

[0007] In some embodiments, a front sliding member is slidably disposed on the front lower cross brace, the other end of the front pull rod is pivotally connected to the front sliding member, a rear sliding member is slidably disposed on the rear lower cross brace, and the other end of the rear pull rod is pivotally connected to the rear sliding member.

[0008] In some embodiments, the locking mechanism is disposed between the front sliding members on both sides and the rear sliding members on both sides.

[0009] In some embodiments, the locking mechanism includes a front locking brace disposed between the front sliding members on both sides, a rear locking brace disposed between the rear sliding members on both sides, at least one front locking pull rod, and at least one rear locking pull rod. One end of the front locking pull rod is pivotally connected to one end of the rear locking pull rod through a rotating joint. The other end of the front locking pull rod is rotatably disposed with the front sliding members on both sides through the front locking brace, and the other end of the rear locking pull rod is rotatably disposed with the rear sliding members on both sides through the rear locking brace. A shelving rack is installed at the bottom of the middle vertical rod. When the locking mechanism locks the trolley in the unfolded position, the front locking pull rod and / or the rear locking pull rod presses on the shelving rack. A lifting handle can be disposed on the front locking pull rod and / or the rear locking pull rod. By pulling the lifting handle, the pivot point between the front locking pull rod and the rear locking pull rod can be raised or lowered, so as to control the front sliding member and the rear sliding member to move towards or away from each other, thereby controlling the front pull rod and the rear pull rod to move relatively closer or relatively farther away, so as to realize the synchronous folding or synchronous unfolding of the two parallelograms.

[0010] In some embodiments, lower one-way rotating joints are respectively fixed at the bottoms of the middle vertical rods on both sides. The front lower cross brace and the rear lower cross brace on each side are respectively pivotally connected to the front part and the rear part of the corresponding lower one-way rotating joint. The shelving rack is fixed between the lower one-way rotating joints on both sides.

[0011] In some embodiments, there are two front locking pull rods and two rear locking pull rods. The two front locking pull rods are respectively pivotally connected to the corresponding rear locking pull rods through pivot rotating joints. A connecting rod is connected between the two pivot rotating joints, and the connecting rod forms a lifting unlocking handle. Unlocking can be operated with one hand, and lifting to unlock is convenient to operate.

[0012] In some embodiments, the trolley frame further includes a plurality of fixed cross bars fixedly connected between the side brackets on both sides.

[0013] In some embodiments, the trolley frame further includes front side enclosures for space expansion disposed at the front parts of the front brackets on both sides. The front side enclosures are installed between the front brackets on both sides through link mechanisms on both sides.

[0014] In some embodiments, the lower parts of the left and right sides of the front side frame are respectively pivotally connected to the corresponding front brackets. Each side link mechanism includes a guide rod whose lower end is pivotally connected to the lower part of the corresponding front bracket. A guide groove is formed on the guide rod, and positioning pins capable of sliding in the corresponding guide grooves are respectively arranged on the left and right sides of the front side frame. A clamp for clamping the side rods on both sides of the front side frame is fixed on each side of the front bracket. After the front side frame is turned forward, the storage space of the trolley can be further enlarged.

[0015] In some embodiments, the trolley further includes a power mechanism for controlling the rotation of the rear wheel assembly, and the power mechanism includes a battery pack arranged between the bottoms of the two rear brackets.

[0016] The scope of the present utility model is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features. For example, technical solutions formed by mutually replacing the above features with (but not limited to) technical features with similar functions disclosed in the present application, etc.

[0017] Due to the application of the above technical solutions, the present utility model has the following advantages compared with the prior art: The present utility model provides a trolley. In each side bracket, a parallelogram is respectively formed between the front upper cross brace, the front lower cross brace, the front bracket and the middle vertical rod, and between the rear upper cross brace, the rear lower cross brace, the rear bracket and the middle vertical rod. The two parallelograms share the middle vertical rod. By controlling the middle vertical rod up or down, the front and rear folding or unfolding of the trolley frame can be controlled. The operation is convenient and fast, and the shape is regular and flat after folding, which is convenient for storage. Description of the Drawings

[0018] Figure 1 It is a three-dimensional structure schematic diagram of the unfolded trolley;

[0019] Figure 2 It is a three-dimensional structure schematic diagram of the folding process of the trolley;

[0020] Figure 3 It is a three-dimensional structure schematic diagram of the folded trolley;

[0021] Figure 4 It is a side view of the folded trolley;

[0022] Wherein: 1. Side bracket; 11. Middle vertical rod; 111. Lower one-way rotating joint; 12. Front bracket; 121. Front wheel assembly; 13. Rear bracket; 131. Rear wheel assembly; 14. Front upper cross brace; 15. Front lower cross brace; 151. Front sliding member; 16. Rear upper cross brace; 17. Rear lower cross brace; 171. Rear sliding member; 18. Front pull rod; 19. Rear pull rod; 2. Locking mechanism; 21. Front lock brace; 22. Rear lock brace; 23. Front lock pull rod; 24. Rear lock pull rod; 25. Lifting unlocking handle; 3. Shelf; 4. Fixed cross bar; 5. Front side enclosure; 51. Guide rod; 511. Guide groove; 52. Positioning pin; 53. Clamp; 6. Battery pack. Detailed implementation manner

[0023] As Figures 1-4 shown, a trolley includes a trolley frame having a deployed state and a folded state, and a cloth pocket provided on the trolley frame. The trolley frame includes side brackets 1 on both left and right sides, a locking mechanism 2, and the trolley frame further includes a plurality of fixed cross bars 4 fixedly connected between the side brackets 1 on both sides.

[0024] Each side bracket 1 includes a middle vertical rod 11, a front bracket 12, a rear bracket 13, a front upper cross brace 14, a front lower cross brace 15, a rear upper cross brace 16, a rear lower cross brace 17, a front pull rod 18, and a rear pull rod 19. The plurality of fixed cross bars 4 include fixed cross bars 4 fixed between the front brackets 12 on both sides, fixed between the rear brackets 13 on both sides, and between the rear wheel assemblies 131 at the bottom of the rear bracket 13, so that the side brackets 1 on both left and right sides move synchronously.

[0025] In each side bracket 1, the front bracket 12 and the rear bracket 13 are respectively arranged on the front and rear sides of the middle vertical rod 11. The front upper cross brace 14 and the front lower cross brace 15 are respectively arranged one above the other between the front bracket 12 and the middle vertical rod 11 to form a parallelogram. The rear upper cross brace 16 and the rear lower cross brace 17 are respectively arranged one above the other between the rear bracket 13 and the middle vertical rod 11 to also form a parallelogram. The two parallelograms share the middle vertical rod 11.

[0026] For the front pull rod 18 and the rear pull rod 19, one end of the front pull rod 18 and one end of the rear pull rod 19 are respectively pivotally connected to the front and rear side portions of the middle vertical rod 11. The other end of the front pull rod 18 is installed on the front lower cross brace 15 in a manner that can slide and rotate. In this embodiment, a sliding sleeve-shaped front sliding member 151 is slidably provided on the front lower cross brace 15, and the other end of the front pull rod 18 is pivotally connected to the front sliding member 151. In this embodiment, the other end of the rear pull rod 19 is installed on the rear lower cross brace 17 in a manner that can slide and rotate. A sliding sleeve-shaped rear sliding member 171 is slidably provided on the rear lower cross brace 17, and the other end of the rear pull rod 19 is pivotally connected to the rear sliding member 171.

[0027] A universal front wheel assembly 121 is installed at the bottom of each front support 12, and a rear wheel assembly 131 in the left - right axial direction is installed at the bottom of the rear support 13.

[0028] When the front support 12 and the rear support 13 move away from the middle vertical rod 11 in the corresponding front - rear direction, the cart frame expands front - rear; when the front support 12 and the rear support 13 move closer to the middle vertical rod 11 front - rear respectively, the cart frame folds front - rear.

[0029] To make the cart frame stable in the expanded position, a single - way rotating joint 111 with an upward U - shaped notch is fixed at the bottom of each middle vertical rod 11. The front lower cross brace 15 and the rear lower cross brace 17 on each side are pivotally connected to the front and rear parts of the corresponding single - way rotating joint 111 respectively, and the end parts of the front lower cross brace 15 and the rear lower cross brace 17 on each side respectively have abutting parts that cross the pivot point. When the cart frame is in the expanded position, the abutting parts of the front lower cross brace 15 and the rear lower cross brace 17 respectively press against the middle part of the single - way rotating joint 111.

[0030] Similarly, to make the cart frame stable in the expanded position, an upper single - way rotating joint with a downward U - shaped notch is also fixed at the top of each middle vertical rod 11. The front upper cross brace 14 and the rear upper cross brace 16 on each side are pivotally connected to the front and rear parts of the corresponding upper single - way rotating joint respectively. When the cart frame is in the expanded position, the end parts of the front upper cross brace 14 and the rear upper cross brace 16 respectively press against the two end parts of the upper single - way rotating joint.

[0031] Since the front and rear two parallelograms share the middle vertical rod 11, therefore, by simply controlling the middle vertical rod 11 to move up or down, the folding or unfolding of the cart frame can be controlled.

[0032] Preferably, to make the cart frame stable in the expanded position, the cart frame further includes a locking mechanism 2 for locking the cart frame in the expanded position. In this embodiment, the locking mechanism 2 is arranged between the front sliding members 151 on both sides and the rear sliding members 171 on both sides.

[0033] Specifically, the locking mechanism 2 includes a front locking brace 21 arranged between the front sliding members 151 on both sides, a rear locking brace 22 arranged between the rear sliding members 171 on both sides, a front locking pull rod 23, and a rear locking pull rod 24.

[0034] There are two front locking pull rods 23 and two rear locking pull rods 24. The two front locking pull rods 23 are pivotally connected to the corresponding rear locking pull rods 24 through pivot rotating joints, that is, one end of each front locking pull rod 23 is pivotally connected to one end of the corresponding rear locking pull rod 24 through a rotating joint, and the two rotating joints are connected by a connecting rod, and this connecting rod forms a lifting unlocking handle 25.

[0035] The other end of each front locking pull rod 23 is rotatably arranged with the two side front sliding members 151 through a front locking support rod 21. Specifically, the structure can be that the other end of each front locking pull rod 23 is fixed on the front locking support rod 21, and the front locking support rod 21 is rotatably connected with the two side front sliding members 151. Or it can be that the other end of each front locking pull rod 23 is rotatably connected with the front locking support rod 21, and the front locking support rod 21 is fixedly connected with the two side front sliding members 151. Similarly, the other end of the rear locking pull rod 24 can also be rotatably arranged with the two side rear sliding members 171 through a rear locking support rod 22 in the above two ways.

[0036] In this embodiment, two shelving frames 3 are installed between the lower single-direction rotating joints 111 at the bottoms of the middle vertical rods 11 on the left and right sides. When the locking mechanism 2 locks the trolley in the unfolded position, both the front locking pull rod 23 and the rear locking pull rod 24 press on the shelving frames 3. In this embodiment, shelving clamps are respectively fixed on each shelving frame 3 for positioning the front locking pull rod 23 and the rear locking pull rod 24 pressing on the shelving frames 3, so that the trolley frame in the unfolded position is more stable and better stressed.

[0037] The trolley frame further includes a front side enclosure 5 for space expansion arranged at the front parts of the two side front brackets 12. The front side enclosure 5 is installed between the two side front brackets 12 through two side link mechanisms.

[0038] The lower left and right parts of the front side enclosure 5 are respectively pivotally connected with the corresponding front brackets 12. Each side link mechanism includes a guide rod 51 with its lower end pivotally connected to the lower part of the corresponding front bracket 12. A guide groove 511 is formed on the guide rod 51. Positioning pins 52 capable of sliding in the corresponding guide grooves 511 are respectively arranged on the left and right sides of the front side enclosure 5. Clamps 53 for clamping the side rods of the front side enclosure 5 are fixed on each side of the front brackets 12.

[0039] The trolley further includes a power mechanism for controlling the rotation of the rear wheel assembly 131. The power mechanism includes a drive motor arranged on the rear wheel assembly 131 and a battery pack 6 for supplying power to the drive motor. The battery pack 6 is fixed between the bottoms of the two side rear brackets 13.

[0040] The above embodiments are only for explaining the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A trolley, comprising a trolley frame having an unfolded state and a folded state, and a cloth bag arranged on the trolley frame, wherein the trolley frame comprises left and right side brackets (1) and a locking mechanism (2), and is characterized in that: Each side bracket (1) includes middle vertical rod (11); The front bracket (12) and the rear bracket (13) are respectively arranged at the front and rear sides of the middle vertical rod (11); in a folded state, the front bracket (12) and the rear bracket (13) are respectively moved closer to the middle vertical rod (11); in an unfolded state, the front bracket (12) and the rear bracket (13) are unfolded accordingly; a front wheel assembly (121) is installed at the bottom of the front bracket (12), and a rear wheel assembly (131) is installed at the bottom of the rear bracket (13); A front upper cross brace (14) and a front lower cross brace (15) are respectively arranged one above and one below between the front bracket (12) and the middle vertical rod (11). A rear upper cross brace (16) and a rear lower cross brace (17), respectively arranged one above and one below between the rear support (13) and the middle vertical rod (11); A front pull rod (18) and a rear pull rod (19), one end of the front pull rod (18) and one end of the rear pull rod (19) are respectively pivotally connected to the middle vertical rod (11), the other end of the front pull rod (18) is slidably and rotatably mounted on the front upper cross brace (14), the front lower cross brace (15) or the front bracket (12), and the other end of the rear pull rod (19) is slidably and rotatably mounted on the rear upper cross brace (16), the rear lower cross brace (17) or the rear bracket (13).

2. The trolley according to claim 1, characterized in that: A front slide (151) is slidably disposed on the front lower cross brace (15), and the other end of the front pull rod (18) is pivotally connected to the front slide (151). A rear slide (171) is slidably disposed on the rear lower cross brace (17), and the other end of the rear pull rod (19) is pivotally connected to the rear slide (171).

3. The trolley according to claim 2, characterized in that: The locking mechanism (2) is arranged between the front sliding members (151) on both sides and the rear sliding members (171) on both sides.

4. The trolley according to claim 3, characterized in that: The locking mechanism (2) comprises a front locking support rod (21) arranged between the front sliding members (151) on both sides, a rear locking support rod (22) arranged between the rear sliding members (171) on both sides, at least one front locking rod (23), and at least one rear locking rod (24); one end of the front locking rod (23) is pivotally connected to one end of the rear locking rod (24); the other end of the front locking rod (23) is rotatably arranged with the front sliding members (151) on both sides through the front locking support rod (21); the other end of the rear locking rod (24) is rotatably arranged with the rear sliding members (171) on both sides through the rear locking support rod (22); a shelf (3) is installed at the bottom of the middle vertical rod (11); when the locking mechanism (2) locks the trolley in the unfolded position, the front locking rod (23) and / or the rear locking rod (24) are pressed on the shelf (3).

5. The trolley according to claim 4, characterized in that: A lower one-way rotating joint (111) is fixed to the bottom of the middle vertical rods (11) on both sides, respectively; the front lower cross brace (15) and the rear lower cross brace (17) on each side are respectively connected to the front and rear pivots of the corresponding lower one-way rotating joint (111); and the shelf (3) is fixed between the lower one-way rotating joints (111) on both sides.

6. The trolley according to claim 5, characterized in that: There are two front lock rods (23) and two rear lock rods (24). The two front lock rods (23) are respectively pivotally connected to the corresponding rear lock rods (24) via pivot joints. The two pivot joints are connected via a connecting rod, and the connecting rod forms a lifting and unlocking handle (25).

7. The trolley according to claim 1, characterized in that: The cart frame also includes a plurality of fixed cross bars (4) fixedly connected between the side brackets (1) on both sides.

8. The trolley according to claim 1, characterized in that: The cart frame further comprises a front side frame (5) for space expansion, which is arranged in front of the front frames (12) on both sides; the front side frame (5) is installed between the front frames (12) on both sides via a connecting rod mechanism on both sides.

9. The trolley according to claim 8, characterized in that: The lower left and right sides of the front side frame (5) are respectively pivotally connected to the corresponding front bracket (12), and the connecting rod mechanism on each side includes a guide rod (51) whose lower end is pivotally connected to the lower part of the corresponding front bracket (12), and a guide groove (511) is provided on the guide rod (51). The left and right sides of the front side frame (5) are respectively provided with positioning pins (52) that can slide in the corresponding guide groove (511), and a clamp (53) for clamping the side bars of the front side frame (5) is fixed on the front bracket (12) on each side.

10. The trolley according to claim 1, characterized in that: The trolley further comprises a power mechanism for controlling the rotation of the rear wheel assembly (131), the power mechanism comprising a battery pack (6) arranged between the bottoms of the rear brackets (13) on both sides.

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