Multifunctional cart

Abstract

The utility model relates to the technical field of trolleys, in particular to a multifunctional trolley. A multifunctional cart comprises a bottom frame which is located at the bottom of the cart and can be folded, four wheels are arranged at the lower end of the bottom frame, and a front vertical frame and a rear vertical frame which are hinged to the bottom frame are arranged at the front end and the rear end of the bottom frame respectively. First locking structures for limiting the rotating angles of the front vertical frame and the rear vertical frame are arranged at the joints of the front vertical frame and the rear vertical frame with the underframe; the outer sides of the front vertical frame and the rear vertical frame are respectively hinged with a front bracket and a rear bracket which are used for supporting the horizontal or inclined posture of the front vertical frame and the rear vertical frame; and a second locking structure for limiting the rotation of the front bracket is arranged between the front bracket and the front vertical frame, so that the front bracket can be used as a push handle or a pull handle for pushing the cart. The foldable trolley has the advantages that the foldable trolley can be folded and used for transporting goods, and a user can lie on the trolley to have a rest.

Description

Technical Field

[0001] This utility model relates to the field of handcart technology, and in particular to a multi-functional handcart. Background Technology

[0002] In the prior art, trailers or handcarts mainly include a trailer frame with wheel assemblies at the bottom and a towing bar located at the front of the trailer frame. The trailer frame typically includes a front wheel bracket, a rear wheel bracket, and a frame connecting the upper parts of the front and rear wheel brackets. The front and rear wheel brackets can rotate relative to the frame. To facilitate folding the frame, the frame itself is usually also designed to be foldable. For example, Chinese Patent Application No. CN202420455417.6 discloses a foldable frame. The frame itself can be folded, and the towing bars at the front and rear ends of the frame can be used as push handles and handles for pushing and pulling the frame.

[0003] However, the aforementioned trolleys can only be used for transporting goods. Due to the limited size of the trolley frame, users working outdoors cannot lie down on the trolley to rest. Utility Model Content

[0004] To address the shortcomings of existing technologies, a multi-functional trolley is provided that can be folded, used for transporting goods, and allows users to lie down and rest.

[0005] This utility model is achieved by the following technical solution: a multi-functional trolley, including a base frame located at the bottom of the trolley and capable of folding itself, four wheels at the lower end of the base frame, and a front upright and a rear upright hinged to the base frame at the front and rear ends respectively; a first locking structure is provided at the connection between the front upright and the base frame to limit the rotation angle of the front upright and the rear upright; a front bracket and a rear bracket are respectively hinged to the outer sides of the front upright and the rear upright to support the front upright and the rear upright in a horizontal or inclined posture; a second locking structure is provided between the front bracket and the front upright to limit the rotation of the front bracket, so that the front bracket can be used as a pusher or puller to push the trolley.

[0006] In this design, goods can be placed on the base frame. The first locking mechanism then adjusts the front and rear uprights to be perpendicular to the base frame. The second locking mechanism then adjusts the angle between the front support and the front upright, allowing the front support to function as a push-pull handle, enabling the user to push and pull the trolley to transport goods. When the user wants to lie down and rest, the first locking mechanism rotates the front and rear supports to a horizontal position. Rotating the front and rear supports allows them to support the front and rear uprights respectively, allowing the user to lie flat on the front, base, and rear uprights.

[0007] The first and second locking structures can be connected by a sliding sleeve with a linkage rod; or the front frame, rear frame, or front support can be provided with a sleeve into which a rod can be inserted. When the front frame, rear frame, or front support rotates to a specified angle, a connecting rod can be inserted into the sleeve and fixed in place to restrict the rotation of the front frame, rear frame, or front support, etc.

[0008] The base frame itself can be folded and laid flat. To achieve the flattening of the base frame, any existing hinge structure that prevents the base frame from being unfolded further can be used, such as the base frame support in the comparison document.

[0009] The front and rear uprights are hinged to the base frame, and the front and rear supports are hinged to the front and rear uprights respectively, so that when the trolley is folded, all four components can converge towards the center.

[0010] This design not only allows the foldable trolley to be used for transporting goods, but also provides a space for users to lie down and rest, making it more functional.

[0011] Preferably, the first locking structure includes a first sliding sleeve and a linkage rod. The first sliding sleeve is sleeved and slidably fitted onto the rods of the front and rear uprights. One end of the linkage rod is hinged to the base frame, and the other end is hinged to the first sliding sleeve. A first fastening structure is provided between the first sliding sleeve and the rods of the front and rear uprights to restrict the sliding of the first sliding sleeve.

[0012] The two hinge points of the linkage rod, as well as the hinge points of the front and rear uprights with the base frame, form a triangle when connected by lines. When the first fastening structure restricts the sliding of the first sleeve, the shape of this triangle remains unchanged, thus achieving locking between the front and rear uprights and the base frame. The first fastening structure can be a screw or a flexible pin on the first sleeve; tightening the screw or inserting / removing the flexible pin controls the tightness, thus allowing the first sleeve to slide.

[0013] Preferably, the front support includes a main frame and an auxiliary frame, both of which are hinged to the front upright. The main frame and the auxiliary frame are connected by a second sliding sleeve, which is fitted onto and slidably mounted on the main frame. The end of the auxiliary frame is hinged to the second sliding sleeve. A second fastening structure is provided between the second sliding sleeve and the main frame to restrict the sliding of the second sliding sleeve. The main frame, the auxiliary frame, and the second sliding sleeve constitute the second locking structure.

[0014] Both the main frame and the auxiliary frame are hinged to the front upright. Simultaneously, the other end of the auxiliary frame is hinged to a second sliding sleeve that slides onto the main frame. The hinge points of these three components form a triangle. When the second fastening structure restricts the sliding of the second sliding sleeve, the shape of this triangle remains unchanged, thus achieving a locking mechanism between the front support and the front upright. The fastening structure can be a screw or a spring-loaded pin on the second sliding sleeve. Tightening the screw or inserting / removing the spring-loaded pin controls the tightness, allowing the second sliding sleeve to slide.

[0015] Preferably, the first fastening structure is the same as the second fastening structure. The front frame, the rear frame and the main frame are provided with a number of fastening holes spaced apart along their length. The first sliding sleeve and the second sliding sleeve are each provided with a button. The button is rotatably connected to the respective first sliding sleeve and the second sliding sleeve. One end of the button is provided with a spring, and the other end of the button is provided with a protrusion for insertion into the fastening hole. The spring drives one end of the button to flip, so that the protrusion at the other end of the button is inserted into the fastening hole.

[0016] Users can disengage the protrusion from the fastening hole by pressing the button, allowing the first and second sliding sleeves to slide onto the front and rear uprights and the main frame, respectively. This enables the front and rear uprights and the main frame to rotate, changing the shape of the triangle and allowing the entire front and rear uprights and the main frame to fold. The position of the front and rear uprights and the main frame can also be adjusted to change the angle between the front and rear uprights and the base frame, as well as the angle between the front and rear uprights and the main frame, thus changing the tilt angle to allow the user to lie down or lean against it; thus enhancing functionality.

[0017] Preferably, a support sleeve is provided between the rear support and the rear upright, the support sleeve is hinged to the rear upright, the rear support is fixed to the support sleeve, and the support sleeve has an abutment portion. When the abutment portion contacts the rear upright, the rear support is extended to its limit position.

[0018] By setting an abutment part that abuts against the rear upright, the rear support cannot rotate after being extended to its limit position when the rear upright is laid flat, thereby supporting the rear upright and keeping it in a horizontal state.

[0019] Preferably, the base frame includes a first base frame and a second base frame that are arranged front to back and hinged together. The first base frame and the second base frame are hinged together and can abut against each other. When the base frame is flattened, the first base frame and the second base frame abut against each other to keep the entire base frame flat.

[0020] The first and second base frames are joined together to maintain the unfolded state of the base frame after it is deployed.

[0021] Preferably, the main frame is U-shaped and includes a first main frame located on both sides of the front upright, and a second main frame perpendicular to the first main frame and connected between the two first main frames; the first main frame is hinged to the middle of the front upright; a pull rod is rotatably connected to the front side of the base, and the pull rod is located between the two first main frames; when the pull rod is in use, the front support flips downward to avoid the pull rod, and when the front support is used as a support or pusher, the pull rod is fixed by a fixing member.

[0022] Connecting the first main frame to the middle of the front upright not only facilitates the front support's rotation to support the front upright, but also avoids interference with the tie rod during rotation. Because the lower end of the tie rod is rotatably connected to the base frame, and the tie rod is located between the two first main frames, the front support can rotate downwards to allow for greater movement when the tie rod is needed. This greater degree of freedom makes the tie rod more convenient for users as a handle.

[0023] Preferably, the fastener has a C-shaped opening facing the front of the trolley, and the opening of the fastener can deform to engage the pull rod.

[0024] The pull rod is secured by a fastener, allowing it to be locked onto the fastener when not in use.

[0025] Preferably, the pull rod includes a main rod rotatably connected to the base frame, auxiliary rods located on both sides of the main rod, and a handle at the top of the auxiliary rod; a sliding seat is provided between the auxiliary rod and the main rod, the end of the auxiliary rod is fixed to the sliding seat, and the main rod is slidably engaged with the sliding seat; a T-shaped sleeve is fixed to the top of the main rod, the T-shaped sleeve is fitted onto the auxiliary rod and the two are slidably engaged, a cam and a friction element that contacts the auxiliary rod are provided inside the T-shaped sleeve, and a wrench is connected to the outside of the T-shaped sleeve; moving the wrench realizes the rotation of the cam to control whether the cam presses against the friction element.

[0026] When the cam is not pressing the friction element, the auxiliary rod can slide relative to the T-shaped sleeve, thereby adjusting the length of the entire pull rod. When the length is adjusted to the appropriate position, the wrench is turned so that the cam presses the friction element, and the friction element squeezes the auxiliary rod to fix the position of the auxiliary rod. At this time, the length of the pull rod is fixed.

[0027] Preferably, the wheel is equipped with a pedal-operated braking structure; the lower end of the base frame is fixed with a vertically extending connecting column, and the connecting column is provided with a bushing and a rotating shaft. The rotating shaft is fixedly connected to the front fork of the wheel below, so that the front wheel and / or the rear wheel can rotate 360°.

[0028] The braking structure can adopt the pedal-type braking structure used in any existing stroller wheel; the 360° rotation of the wheel enables the stroller to be steered, and when folded, the wheel can make way for the front and rear supports, reducing the overall folded space. The axle is rotatably connected to the connecting column via a bushing, while the front fork of the wheel is fixedly connected to the axle, allowing the wheel to rotate 360°.

[0029] Compared with the prior art, this utility model has the advantages of being foldable, being used for transporting goods, and allowing users to lie down and rest on the trolley. Attached Figure Description

[0030] Figure 1 A schematic diagram of the trolley when unfolded and laid flat.

[0031] Figure 2 for Figure 1 A schematic diagram of the front bracket after angle adjustment;

[0032] Figure 3 This is a structural diagram of the trolley in use;

[0033] Figure 4 A schematic diagram of the trolley in a semi-folded state;

[0034] Figure 5 A schematic diagram of the folded trolley.

[0035] Figure 6 A schematic diagram of the first locking structure and the second locking structure;

[0036] Figure 7 This is a schematic diagram of the internal structure of the first and second sliding sleeves;

[0037] Figure 8 A schematic diagram of a trolley with a pull rod;

[0038] Figure 9 This is a schematic diagram of the tie rod structure;

[0039] Figure 10 This is a schematic diagram of the structure of the T-shaped sleeve for the tie rod;

[0040] Figure 11 This is a cross-sectional view of the front wheel.

[0041] Reference numerals: 1. Base frame; 11. First base frame; 12. Second base frame; 13. Linkage rod; 14. First sliding sleeve; 21. Front upright; 22. Rear upright; 3. Wheel; 31. Brake structure; 32. Front fork; 41. Front support; 411. Main frame; 4111. First main frame; 4112. Second main frame; 412. Auxiliary frame; 413. Second sliding sleeve; 414. Button; 4141 415. Shaft hole; 416. Fastening hole; 417. Spring; 418. Protrusion; 42. Rear bracket; 421. Support sleeve; 422. Abutment part; 5. Pull rod; 51. Main rod; 52. Sliding seat; 53. Auxiliary rod; 54. Handle; 55. T-sleeve; 56. Wrench; 57. Cam; 58. Friction part; 6. Fixing part; 7. Connecting column; 71. Bushing; 72. Rotating shaft; 73. Bolt. Detailed Implementation

[0042] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0043] like Figures 1 to 5 As shown, this embodiment discloses a multi-functional trolley, including a base frame 1 with wheels 3 arranged around its lower end. The base frame 1 includes a first base frame 11 located at the front of the trolley and a second base frame 12 located at the rear of the trolley, with the first base frame 11 and the second base frame 12 hinged together. When the base frame 1 is flattened, the first base frame 11 and the second base frame 12 abut against each other, preventing them from unfolding further and maintaining the flattened state of the base frame 1. A front support 41 is hinged to the front upright 21, and a rear support 42 is hinged to the rear upright 22. Both the front support 41 and the rear support 42 are foldable and used for support when the front upright 21 and the rear upright 22 are flattened.

[0044] like Figure 6 and Figure 7 As shown, a first locking structure is provided between the front upright 21 and the rear upright 22 and the base frame 1 to limit the rotation angle of the front upright 21 and the rear upright 22. The first locking structure includes a first sliding sleeve 14 and a linkage rod 13. The first sliding sleeve 14 is sleeved and slidably fitted on the rod body of the front upright 21 and the rear upright 22. One end of the linkage rod 13 is hinged to the base frame 1, and the other end is hinged to the first sliding sleeve 14. A first fastening structure is provided between the first sliding sleeve 14 and the rod body of the front upright 21 and the rear upright 22 to limit the sliding of the first sliding sleeve 14.

[0045] The front support 41 includes a main frame 411 and an auxiliary frame 412. Both the main frame 411 and the auxiliary frame 412 are hinged to the front upright 21. The main frame 411 and the auxiliary frame 412 are connected by a second sliding sleeve 413. The second sliding sleeve 413 is fitted and slidably mounted on the rod of the main frame 411. The end of the auxiliary frame 412 is hinged to the second sliding sleeve 413. A second fastening structure is provided between the second sliding sleeve 413 and the main frame 411 to restrict the sliding of the second sliding sleeve 413. The main frame 411, the auxiliary frame 412 and the second sliding sleeve 413 constitute a second locking structure.

[0046] The first fastening structure is the same as the second fastening structure. The front frame 21, the rear frame 22 and the main frame 411 are provided with a number of fastening holes 415 spaced apart along their length. The first sliding sleeve 14 and the second sliding sleeve 413 are both provided with buttons 414. The buttons 414 are rotatably connected to the first sliding sleeve 14 and the second sliding sleeve 413 by inserting a pin (not shown in the figure) into the shaft hole 4141. One end of the button 414 is provided with a spring 416, and the other end of the button 414 is provided with a protrusion 417 for inserting into the fastening hole 415. The spring 416 drives one end of the button 414 to flip, so that the protrusion 417 at the other end of the button 414 is inserted into the fastening hole 415.

[0047] like Figures 1 to 4 As shown, the rear support 42 is hinged to the rear upright 22 via the support sleeve 421. The support sleeve 421 is hinged to the rear upright 22, and the rear support 42 is fixed to the support sleeve 421. The support sleeve 421 has an abutment portion 422. When the abutment portion 422 contacts the rear upright 22, the rear support 42 unfolds to its limit position, so that the rear upright 22 can be supported on the ground.

[0048] like Figures 8 to 10 As shown, a tie rod 5 is rotatably connected to the front side of the first base frame 11. The front upright 21 is provided with a C-shaped opening fastener 6, the opening of which faces forward. The opening of the fastener 6 can deform to engage the tie rod 5. The tie rod 5 includes a main rod 51 rotatably connected to the base frame, auxiliary rods 53 located on both sides of the main rod 51, and a handle 54 located at the top of the auxiliary rods 53. The handle 54 is fixed to the two auxiliary rods 53. A sliding seat 52 is provided between the auxiliary rods 53 and the main rod 51. The end of the auxiliary rod 53 is fixed to the sliding seat 52. The sliding seat 52 is sleeved on the main rod 51, and the main rod 51 and the sliding seat 52 are slidably engaged. A T-shaped sleeve 55 is fixed to the top of the main rod 51. The two sides of the T-shaped sleeve 55 are fitted onto the auxiliary rod 53 and the two slide together. The T-shaped sleeve 55 has a cam 57 and a friction element 58 inside. The cam 57 is connected to a wrench 56 located on the outside of the T-shaped sleeve 55. Moving the wrench 56 will rotate the cam 57 to control whether the cam 57 presses against the friction element 58.

[0049] like Figure 8As shown, the main frame 411 includes two first main frames 4111 located on the left and right sides of the front upright 21 and a second main frame 4112 connected to the two first main frames 4111. The second main frame 4112 is perpendicular to the first main frame 4111. The tie rod 5 is located between the two first main frames 4111. The first main frames 4111 and the second main frame 4112 form a U-shaped structure. The first main frame 4111 is hinged to the middle of the front upright 21. When the tie rod 5 is in use, the front support 41 flips downward to avoid it. When the front support 41 is used as a support or pusher, the tie rod 5 is fixed by the fixing member 6 to avoid the front support 41.

[0050] like Figure 5 and Figure 11 As shown, wheel 3 includes a front wheel located at the front of base frame 1 and a rear wheel located at the rear of base frame 1. Both the front and rear wheels are equipped with a brake structure 31, which is a pedal-type brake structure used in any existing trolley wheel. The front wheel can rotate 360°. A vertically extending connecting post 7 is welded to the lower end of base frame 1. The connecting post 7 is hollow and contains a bushing 71 and a rotating shaft 72. The rotating shaft 72 is connected to the front fork 32 of the lower wheel 3 (front wheel). A bolt 73 is threaded into the top of the rotating shaft 72, allowing the rotating shaft 72 to be rotatably connected to the connecting post 7 so that the front wheel can rotate 360°.

[0051] When the trolley needs to be pulled, the user presses button 414 to slide the first sliding sleeve 14, raising the front upright 21 and rear upright 22 vertically to the base frame 1. The user can then pull the lever 5 to move the trolley and adjust the length of the lever 5 by turning the wrench 56. Goods can be placed on the base frame 1 for transport.

[0052] When the trolley needs to be pushed, press button 414 to slide the second sliding sleeve 413 to rotate the front support 41. When the front support 41 is unfolded to an angle that is convenient for the user to push, release button 414 so that the protrusion 417 engages with the fastening hole 415. At this time, the goods can be placed on the base frame 1 and the front support 41 can be used as a pusher to push the trolley.

[0053] When the user wants to lie down and rest, they can step on the brake to prevent the wheels 3 from turning. Press button 414 to adjust the angle of the front stand 21 and the angle of the front support 41, so that the front stand 21 is in a horizontal or tilted state, and the front support 41 supports the horizontal or tilted front stand 21, so that the user can lie down or lean against the front stand 21.

[0054] When the trolley is not in use, the first base frame 11 and the second base frame 12, the front upright frame 21 and the rear upright frame 22, as well as the front support 41 and the rear support 42 can be folded.

Claims

1. A multi-functional trolley, characterized in that: The trolley includes a foldable base frame located at the bottom of the trolley, with four wheels at the lower end of the base frame. A front upright and a rear upright are hinged to the base frame at its front and rear ends, respectively. A first locking structure restricts the rotation angle of the front and rear uprights at their connection points with the base frame. A front support and a rear support are hinged to the outer sides of the front and rear uprights to support their horizontal or tilted positions. A second locking structure restricts the rotation of the front support between it and the front upright, allowing the front support to function as a push handle or pull handle for pushing the trolley.

2. The multi-functional trolley according to claim 1, characterized in that: The first locking structure includes a first sliding sleeve and a linkage rod. The first sliding sleeve is sleeved and slidably fitted onto the rods of the front and rear uprights. One end of the linkage rod is hinged to the base frame, and the other end is hinged to the first sliding sleeve. A first fastening structure is provided between the first sliding sleeve and the rods of the front and rear uprights to restrict the sliding of the first sliding sleeve.

3. The multi-functional trolley according to claim 2, characterized in that: The front support includes a main frame and an auxiliary frame, both of which are hinged to the front upright. The main frame and the auxiliary frame are connected by a second sliding sleeve, which is fitted onto and slidably mounted on the main frame. The end of the auxiliary frame is hinged to the second sliding sleeve. A second fastening structure is provided between the second sliding sleeve and the main frame to restrict the sliding of the second sliding sleeve. The main frame, the auxiliary frame, and the second sliding sleeve constitute the second locking structure.

4. The multi-functional trolley according to claim 3, characterized in that: The first fastening structure is the same as the second fastening structure. The front frame, the rear frame and the main frame are provided with a number of fastening holes spaced apart along their length. The first sliding sleeve and the second sliding sleeve are each provided with a button. The button is rotatably connected to the respective first sliding sleeve and the second sliding sleeve. One end of the button is provided with a spring, and the other end of the button is provided with a protrusion for insertion into the fastening hole. The spring drives one end of the button to flip, so that the protrusion at the other end of the button is inserted into the fastening hole.

5. The multi-functional trolley according to claim 1, characterized in that: A support sleeve is provided between the rear support and the rear upright. The support sleeve is hinged to the rear upright and the rear support is fixed to the support sleeve. The support sleeve has an abutment part. When the abutment part contacts the rear upright, the rear support is extended to its limit position.

6. The multi-functional trolley according to any one of claims 1 to 5, characterized in that: The base frame includes a first base frame and a second base frame that are arranged at the front and rear and hinged together. The first base frame and the second base frame are hinged together and can abut against each other. When the base frame is flattened, the first base frame and the second base frame abut against each other to keep the entire base frame flat.

7. The multi-functional trolley according to claim 3, characterized in that: The main frame is U-shaped and includes a first main frame located on both sides of the front upright, and a second main frame perpendicular to the first main frame and connected between the two first main frames; the first main frame is hinged to the middle of the front upright; a pull rod is rotatably connected to the front side of the base, and the pull rod is located between the two first main frames; when the pull rod is in use, the front support flips down to avoid the pull rod, and when the front support is used as a support or pusher, the pull rod is fixed by a fixing member.

8. The multi-functional trolley according to claim 7, characterized in that: The fastener has a C-shaped opening facing the front of the trolley, and the opening of the fastener can deform to engage the pull rod.

9. The multi-functional trolley according to claim 7, characterized in that: The pull rod includes a main rod rotatably connected to the base frame, auxiliary rods located on both sides of the main rod, and a handle at the top of the auxiliary rod; a sliding seat is provided between the auxiliary rod and the main rod, the end of the auxiliary rod is fixed to the sliding seat, and the main rod is slidably engaged with the sliding seat; a T-shaped sleeve is fixed to the top of the main rod, the T-shaped sleeve is fitted on the auxiliary rod and the two are slidably engaged, the T-shaped sleeve has a cam and a friction element that contacts the auxiliary rod inside, and the cam is connected to a wrench located outside the T-shaped sleeve; moving the wrench causes the cam to rotate to control whether the cam presses against the friction element.

10. The multi-functional trolley according to any one of claims 1 to 5, characterized in that: The wheel is equipped with a pedal-operated braking structure; the lower end of the base frame is fixed with a vertically extending connecting column, and the connecting column is provided with a bushing and a rotating shaft. The rotating shaft is fixedly connected to the front fork of the wheel below, so that the front wheel and / or the rear wheel can rotate 360°.

Images