Folding trolley convenient to store and carry and application

Abstract

The invention belongs to the technical field of carts, and discloses a folding cart convenient to store and carry and application of the folding cart convenient to store and carry. The folding wheel set is connected with the bottom of the first sweeping board in a foldable mode; the handle is used for controlling the folding wheel set to be unfolded and folded; the folding wheel set is opened and closed by swinging the handle. According to the trolley, linkage folding and unfolding of the front wheels and the rear wheels are achieved through the single operating mechanism, and operation convenience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of carts, and in particular to a foldable cart which is convenient for storage and carrying and its application. Background Art

[0002] A trolley is a common means of transportation that can be used to carry items, do daily shopping, or carry equipment when camping or traveling outdoors. The front and rear wheels of a traditional trolley need to be unfolded or folded step by step, which is inefficient. Summary of the invention

[0003] In order to solve the above technical problems, a trolley is provided which can realize the linkage retraction and extension of front and rear wheels through a single operating mechanism.

[0004] To achieve the above objectives, as a first aspect, the technical solution adopted by the present invention is: a foldable trolley that is easy to store and carry, comprising:

[0005] First car plate;

[0006] A folding wheel set, foldably connected to the bottom of the first vehicle plate;

[0007] The handle controls the unfolding and folding of the folding wheel set; the opening and closing of the folding wheel set is achieved by swinging the handle.

[0008] According to the present invention, further, the folding wheel set comprises a front wheel and a rear wheel connected thereto via a transmission link mechanism, and the handle is swingably mounted on a side close to the front wheel;

[0009] A transmission link mechanism is arranged at the bottom of the first vehicle plate and transmits linearly along the length direction of the first vehicle plate. One end of the transmission link mechanism is connected to the handle and the other end is connected to the rear wheel. The transmission link mechanism has a locking structure to lock the unfolded state of the rear wheel. During the swinging process, the handle drives the transmission link mechanism to move, the motion transmission drives the rear wheel to unfold, and the locking mechanism locks the unfolded state of the rear wheel. At the same time, the bottom end of the handle pushes the front wheel to unfold by applying thrust to the front wheel during the swinging process.

[0010] According to the present invention, further, the left and right sides of the first vehicle plate are connected with rotating shafts connected to the front wheels and the rear wheels; a torsion spring is arranged at the corresponding position of the connection between the rotating shaft and the rear wheel to provide restoring force to the rear wheel and restore the folded state after the rear wheel loses external force.

[0011] According to the present invention, further, a transfer seat is installed at the front end of the rotating shaft, and the transfer seat is connected to a foldable front wheel.

[0012] According to the present invention, further, a linkage rod is provided at a lower position of the handle, one end of the transmission linkage mechanism is connected to the linkage rod, and the other end of the transmission linkage mechanism is connected to the rear wheel.

[0013] According to the present invention, further, the transmission link mechanism includes a first link connected to the linkage rod at one end, the other end of the first link connected to a horizontal transmission rod reciprocating along the length direction of the bottom of the first vehicle plate, one end of the horizontal transmission rod is connected to a second link, one end of the second link is connected to the second vehicle plate, and the second link drives the second vehicle plate to open and close;

[0014] The end of the second vehicle plate away from the first vehicle plate is connected to the wheel mounting seat of the rear wheel through a rotating shaft, and the end close to the first vehicle plate is controlled by the second connecting rod to swing the second vehicle plate downward to the unfolded state. At this time, the left and right ends of the second vehicle plate are clamped and fixed to the corresponding wheel mounting seats of the rear wheels to fix the unfolded position of the rear wheels.

[0015] According to the present invention, further, a foldable blocking plate is connected to the rear end of the rotating shaft.

[0016] According to the present invention, further, the handle is also provided with a handle locking rod parallel to the linkage rod, and both ends of the handle locking rod are rotatably connected to the adapter seat; the handle locking rod includes a vertically arranged center rod, and an elastic connecting rod symmetrically about its axis is arranged on the outer periphery of the center rod, and the two far ends of the elastic connecting rod are connected to the corresponding adapter seat, and a switch connected to the elastic connecting rod is mounted on the outer periphery of the center rod. The switch is toggled and the elastic connecting rod is pulled to disengage its two ends from the adapter seat on the corresponding side, thereby unlocking the handle, and the switch is toggled in the reverse direction to reset the elastic connecting rod and lock it with the adapter seat on the corresponding side, thereby fixing the handle and the adapter seat.

[0017] According to the present invention, further, the handle is a retractable structure, and the height of the handle can be adjusted by retracting.

[0018] As a second aspect, the present invention also provides an application of the above-mentioned foldable trolley that is easy to store and carry. When not in use, the handle fits the top of the first vehicle board, and the front wheels and the rear wheels are folded and fitted toward the bottom of the first vehicle board, thereby reducing the volume of the entire foldable trolley; when used as a flatbed vehicle, the handle and the first vehicle board are unfolded 180 degrees, the front wheels are folded, and the rear wheels are unfolded, and items are placed on the first vehicle board to realize the function of a two-wheeled trolley; when used as a camping vehicle, the handle extends vertically upward relative to the first vehicle board, and the angle between the two is 90 degrees. The front wheels and the rear wheels are both in an unfolded state, thereby realizing the function of a four-wheeled vehicle.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the present invention can synchronously unfold the front and rear wheels by swinging the handle, and can change the use state of the cart according to different unfolding angles of the handle, thereby improving applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the present invention from a first viewing angle in a four-wheel unfolded state;

[0021] Figure 2 for Figure 1 AA cross-sectional view of ;

[0022] Figure 3 It is a schematic diagram of the structure of the present invention from a second viewing angle in a four-wheel unfolded state;

[0023] Figure 4 It is a third-view structural schematic diagram of the present invention in a four-wheel unfolded state;

[0024] Figure 5 This is a schematic diagram of an exploded view of the handle of the present invention;

[0025] Figure 6 It is an exploded schematic diagram of the rotating shaft and the rear wheel of the present invention;

[0026] Figure 7 It is a schematic diagram of the connection between the rotating shaft and the front and rear wheels of the present invention;

[0027] Figure 8 This is a schematic structural diagram of the present invention in a two-wheel state from a first viewing angle;

[0028] Fig. 9 It is a structural schematic diagram of the second viewing angle of the two-wheel state of the present invention;

[0029] Fig.10 It is a schematic diagram of the structure of the present invention in a folded state;

[0030] Fig.11 It is a structural schematic diagram of the handle locking rod of the present invention;

[0031] Fig.12 is a schematic diagram of the connection state of the first connecting rod and the horizontal transmission rod when the handle and the first vehicle panel are folded; Fig.13 Schematic diagram of the connection state of the first connecting rod and the horizontal transmission rod when the handle and the first vehicle plate are at 90 degrees;

[0032] Fig.14 It is a schematic diagram of the connection state of the first connecting rod and the horizontal transmission rod when the handle and the first vehicle plate are at 180 degrees.

[0033] Among them, 10-first vehicle plate, 20-front wheel, 30-rear wheel, 40-handle, 410-straight rod, 411-first telescopic part, 412-second telescopic part, 420-horizontal pull rod, 430-reinforcement plate, 440-locking rod, 441-positioning protrusion, 442-protrusion, 443-locking grip, 450-handle locking rod, 451-center rod, 452-elastic connecting rod, 453-switch, 460-linkage rod, 50-rotating shaft, 510-adapter, 60-torsion spring, 70-transmission connecting rod mechanism, 710-first connecting rod, 720-horizontal transmission rod, 730-second connecting rod, 740-elastic movable bolt, 750-elastic fixing pin, 80-second vehicle plate, 90-blocking plate. DETAILED DESCRIPTION

[0034] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0035] like Figures 1 to 11 As shown, the embodiment of the present application discloses a foldable trolley that is easy to store and carry, including a first vehicle plate 10, a foldable front wheel 20 and a rear wheel 30 are installed at the bottom of the first vehicle plate 10, a handle 40 is connected to the side of the first vehicle plate 10 close to the front wheel 20, and the handle 40 can swing up and down relative to the plate surface of the first vehicle plate 10, and the handle 40 is connected to a transmission link mechanism 70 arranged at the bottom of the first vehicle plate 10, and the distal end of the transmission link mechanism 70 is connected to the rear wheel 30. The handle 40 drives the transmission link mechanism 70 to move during the swinging process, and the motion transmission direction is along the front and rear direction of the first vehicle plate 10 to realize motion transmission, thereby realizing the folding and unfolding of the rear wheel 30; the front and rear here are the front and rear directions when the trolley is in use; at the same time, the bottom end of the handle 40 applies a thrust to the mounting seat of the front wheel 20 during the swinging process, so as to push the front wheel 20 to unfold and prevent it from folding, that is, the front wheel 20 and the rear wheel 30 are linked by the swinging of the handle 40, without the need to operate separately, thereby improving the convenience of operation.

[0036] Specifically, the left and right sides of the first vehicle plate 10 are connected to the rotating shaft 50, and the front and rear ends of the rotating shaft 50 are respectively connected to the front wheel 20 and the rear wheel 30. The rear wheel 30 includes a wheel mounting seat rotatably connected to the outer periphery of the rotating shaft 50 and a rear wheel 30 mounted in the wheel mounting seat. A torsion spring 60 is provided at a position corresponding to the wheel mounting seat at the outer periphery of the rear end of the rotating shaft 50. Under the action of external force, the wheel mounting seat rotates along the outer periphery of the rotating shaft 50, and the rear wheel 30 is unfolded, and at the same time, a squeezing force is applied to the torsion spring 60 to make it contract. After the external force is lost, the torsion spring 60 is unfolded and restored by its own torque, driving the corresponding rear wheel 30 to be folded and stored.

[0037] In the embodiment of the present application, a linkage rod 460 is provided at a lower position of the handle 40, and the linkage rod 460 is driven to move by the swing of the handle 40, thereby driving the transmission linkage mechanism 70 connected thereto to transmit linear motion; one end of the first linkage 710 of the transmission linkage mechanism 70 is connected to the linkage rod 460, and the other end is connected to a horizontal transmission rod 720 that reciprocates along the bottom length direction of the first vehicle plate 10, one end of the horizontal transmission rod 720 is connected to the second linkage rod 730, one end of the second linkage rod 730 is connected to the second vehicle plate 80, and the second linkage rod 730 drives the second vehicle plate 80 to open and close. The end of the second vehicle plate 80 away from the first vehicle plate 10 is connected to the wheel mounting seat of the rear wheel through a rotating shaft, and the end close to the first vehicle plate 10 is controlled by the second connecting rod 730 to swing the second vehicle plate 80 downward or upward. The downward swing is the unfolded state. At this time, the left and right ends of the second vehicle plate 80 are clamped and fixed to the corresponding wheel mounting seats of the rear wheel to fix the unfolded position of the rear wheel 30; the second vehicle plate 80 swings upward to the merged state, and is in the same plane with the first vehicle plate 10.

[0038] like Figure 12 to Figure 14 As shown, the first connecting rod 710 is connected to the horizontal transmission rod 720 through an elastic movable bolt 740, and the elastic movable bolt 740 is inserted into the positioning hole of the horizontal transmission rod 720. An elastic fixing pin 750 is provided on one side of the horizontal transmission rod 720, and the elastic fixing pin 750 is located at the corresponding outer side of the positioning hole of the horizontal transmission rod 720 near the first connecting rod 710 at the distal movement limit position of the horizontal transmission rod 720; during the rotation of the handle 40 from 0° to 90°, the handle 40 pushes the first connecting rod 710 and the horizontal transmission rod 720 connected thereto to move linearly, and then the rear wheel is unfolded through the second connecting rod 730. At this time, the horizontal transmission rod 720 moves to the distal limit position, the elastic movable bolt 740 is coaxial with the elastic fixing pin 750, and the elastic fixing pin 750 is in a compressed state and is not embedded in the positioning hole of the horizontal transmission rod 720; during the swinging process from 90° to 180° between the handle 40 and the first vehicle plate 10, the elastic movable bolt 740 is disengaged from the elastic fixing pin 750, At the same time, the elastic fixing pin 750 is embedded in the positioning hole of the horizontal transmission rod 720 to fix the position of the horizontal transmission rod 720 and keep the rear wheel 30 in the unfolded state. The first connecting rod 710 moves toward the rear wheel 30 during the swinging process of the handle 40. During the movement, one end surface of the elastic movable bolt 740 is in contact with the surface of the horizontal transmission rod 720 near the first connecting rod 710. When folding from 90° to 0°, the elastic movable bolt 740 is embedded in the positioning hole of the horizontal transmission rod 720 near the first connecting rod 710, and the elastic fixing pin 750 is turned into a compressed state, breaking away from the fixation of the horizontal transmission rod 720. The elastic movable bolt 740 begins to clamp the horizontal transmission rod 720 and drives the rear wheel 30 to return to the folded state.

[0039] Specifically, the opposing surfaces of the wheel mounting seats of the two rear wheels 30 are provided with limiting protrusions. When the second vehicle plate 80 is in the unfolded state, the left and right ends of the second vehicle plate 80 are pressed against the corresponding limiting protrusions to fix the unfolded position of the rear wheels 30. The rear end of the rotating shaft 50 is connected with a foldable blocking plate 90. When in use, the foldable blocking plate 90 extends toward the top surface of the second vehicle plate 80 to prevent objects from falling. In order to reduce the weight of the vehicle body, the blocking plate 90 is a hollow structure, which not only reduces the weight but also has a beautiful appearance.

[0040] The handle 40 is also provided with a handle locking rod 450 parallel to the linkage rod 460. Both ends of the handle locking rod 450 are rotatably connected to an adapter seat 510 connected to the front end of the rotating shaft 50. The adapter seat 510 has two installation cavities arranged upper and lower. The rotating shaft 50 is inserted into the upper installation cavity, and the short shaft for installing the front wheel mounting seat is inserted into the lower installation cavity. The short shaft is provided with a torsion spring 60 corresponding to the front wheel mounting seat. The handle 40 swings, and its bottom end pushes the front wheel 20 to gradually unfold by increasing the external force applied to the front wheel mounting seat. When the front wheel 20 is fully unfolded, the handle 40 and the first vehicle plate 10 form an angle of 90 degrees. The two ends of the handle 40 are vertically arranged on the opposite surfaces of the front wheel mounting seat to prevent the front wheel mounting seat from folding relative to each other, thereby achieving the fixation of the unfolded state of the front wheel 20.

[0041] The handle locking rod 450 is a rod body with an adjustable distance between its two ends, that is, the distance between its two ends can be adjusted to achieve unlocking or locking with the adapter seat 510; the handle locking rod 450 includes a central rod 451, and an elastic connecting rod 452 symmetrically about its axis is arranged on the outer periphery of the central rod 451, and the two distal ends of the elastic connecting rod 452 are connected to the corresponding adapter seat 510. A switch 453 is mounted on the outer periphery of the central rod 451, and the switch 453 is connected to the elastic connecting rod 452. By toggling the switch 453 and pulling the elastic connecting rod 452, the two ends of the elastic connecting rod 452 are disengaged from the adapter seat 510 on the corresponding side, thereby achieving handle unlocking, and the handle 40 can swing relative to the adapter seat 510. When the switch 453 is released and pressed, the internal spring loses external force, and the elastic connecting rod 452 is automatically reset by its own elastic force and locked with the adapter seat 510 on the corresponding side, thereby achieving fixation of the handle 40 and the adapter seat 510.

[0042] In the embodiment of the present application, the handle 40 includes parallel straight rods 410 and horizontal pull rods 420 whose two ends are respectively connected to the tops of the corresponding side straight rods 410, forming a semi-enclosed frame with an opening downward. In order to improve the strength of the handle 40, a reinforcing plate 430 is provided at a position slightly below the two straight rods 410, and the two ends of the reinforcing plate 430 are respectively fixedly connected to the straight rods 410 on the corresponding sides, thereby fixing the distance between the two straight rods 410 and improving the overall strength of the handle 40.

[0043] In the embodiment of the present application, in order to adapt to different heights to operate the trolley, the straight rod 410 is a telescopic structure, including a first telescopic part 411 and a second telescopic part 412 connected thereto, which can telescope and move, and the length of the straight rod 410 can be changed by the overlap distance between the two. The first telescopic part 411 and the second telescopic part 412 are both hollow cylindrical tubes, and the inner diameters of the two are different. The cylindrical tube with a small inner diameter is nested in the cylindrical tube with a large inner diameter. Positioning holes are set on the circumference of the first telescopic part 411 and the second telescopic part 412. There are multiple positioning holes distributed along the axial direction. The positioning holes of the first telescopic part 411 and the second telescopic part 412 are adjusted to coincide with the axes of the positioning holes, and the length of the straight rod 40 is adjusted by locking.

[0044] Specifically, a locking rod 440 is arranged between the two straight rods 410 and parallel to the reinforcing plate 430. A positioning protrusion 441 matching the positioning hole of the telescopic part is arranged at the end of the locking rod 440. The positioning protrusion 441 is embedded in the positioning hole to achieve the locking of the first telescopic part 411 and the second telescopic part 412. Preferably, the locking rod 440 is a spring tube with adjustable length, and a protrusion 442 is arranged on its outer periphery. A locking gripping part 443 is arranged on the outer periphery of the locking rod 440. A groove (not shown) corresponding to the protrusion 442 is arranged on the inner wall of the locking gripping part 443. The protrusion 442 is embedded in the groove to achieve the fixing of the position of the locking gripping part 443 and the locking rod 440. By rotating the locking gripping part 443, the spring of the locking rod 440 is controlled to be tightened or loosened, that is, the telescopic length of the spring is changed, and then the positioning protrusion 441 is controlled to be embedded in or out of the positioning hole. The first telescopic portion 411 is pressed downward or pulled upward to adjust the overlapping length with the second telescopic portion 412, and the locking grip 443 is rotated with one hand to achieve locking after adjustment, thereby improving the convenience of locking, achieving efficient adjustment, and improving the stability after adjustment.

[0045] The working principle of the present invention is as follows: in the folded state, the handle 40 fits the top of the first vehicle board 10, and the front wheel 20 and the rear wheel 30 are folded and fitted toward the bottom of the first vehicle board 10, thereby reducing the volume of the entire foldable trolley and facilitating storage and carrying; when used as a flatbed vehicle, the handle 40 and the first vehicle board 10 are unfolded at 180 degrees, the front wheel 20 is folded, the rear wheel 30 is unfolded, the blocking plate 90 is unfolded, and items are placed on the first vehicle board 10 to realize the function of a two-wheeled trolley; when used as a camping vehicle, the handle 40 extends vertically upward relative to the first vehicle board 10, and the angle between the two is 90 degrees. The front wheel 20 and the rear wheel 30 are both in the unfolded state, realizing the function of a four-wheeled vehicle and being able to place items.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A foldable trolley that is easy to store and carry, characterized in that: include, First car plate; A folding wheel set, foldably connected to the bottom of the first vehicle plate; The handle controls the unfolding and folding of the folding wheel set; the opening and closing of the folding wheel set is achieved by swinging the handle.

2. The foldable trolley that is easy to store and carry as claimed in claim 1, characterized in that: The folding wheel set comprises a front wheel and a rear wheel connected to the front wheel through a transmission link mechanism, and the handle is swingably mounted on a side close to the front wheel; A transmission link mechanism is arranged at the bottom of the first vehicle plate and transmits linearly along the length direction of the first vehicle plate. One end of the transmission link mechanism is connected to the handle and the other end is connected to the rear wheel. The transmission link mechanism has a locking structure to lock the unfolded state of the rear wheel. During the swinging process, the handle drives the transmission link mechanism to move, the motion transmission drives the rear wheel to unfold, and the locking mechanism locks the unfolded state of the rear wheel. At the same time, the bottom end of the handle pushes the front wheel to unfold by applying thrust to the front wheel during the swinging process.

3. The foldable trolley that is easy to store and carry as claimed in claim 2, characterized in that: The left and right sides of the first vehicle plate are connected with rotating shafts connected to the front wheels and the rear wheels; a torsion spring is arranged at the corresponding position of the connecting position between the rotating shaft and the rear wheel to provide restoring force to the rear wheel and restore the folded state after the rear wheel loses external force.

4. The foldable trolley for easy storage and carrying as claimed in claim 3, characterized in that: A transfer seat is installed at the front end of the rotating shaft, and the transfer seat is connected with a foldable front wheel.

5. The foldable trolley for easy storage and carrying as claimed in claim 2, characterized in that: A linkage rod is arranged at a lower position of the handle, one end of a transmission linkage mechanism is connected to the linkage rod, and the other end of the transmission linkage mechanism is connected to the rear wheel.

6. The foldable trolley for easy storage and carrying as claimed in claim 2, characterized in that: The transmission link mechanism includes a first link connected to the linkage rod at one end, the other end of the first link connected to a horizontal transmission rod that reciprocates along the length direction of the bottom of the first vehicle plate, one end of the horizontal transmission rod connected to a second link, one end of the second link connected to the second vehicle plate, and the second link drives the second vehicle plate to open and close; The end of the second vehicle plate away from the first vehicle plate is connected to the wheel mounting seat of the rear wheel through a rotating shaft, and the end close to the first vehicle plate is controlled by the second connecting rod to swing the second vehicle plate downward to the unfolded state. At this time, the left and right ends of the second vehicle plate are clamped and fixed to the corresponding wheel mounting seats of the rear wheels to fix the unfolded position of the rear wheels.

7. The foldable trolley for easy storage and carrying as claimed in claim 3, characterized in that: The rear end of the rotating shaft is connected with a foldable blocking plate.

8. The foldable trolley for easy storage and carrying as claimed in claim 5, characterized in that: The handle is also provided with a handle locking rod parallel to the linkage rod, and both ends of the handle locking rod are rotatably connected to the adapter seat; the handle locking rod includes a vertically arranged center rod, and an elastic connecting rod symmetrically about its axis is arranged on the outer periphery of the center rod, and the two distal ends of the elastic connecting rod are connected to the corresponding adapter seats, and a switch connected to the elastic connecting rod is mounted on the outer periphery of the center rod. The switch is toggled and the elastic connecting rod is pulled to disengage its two ends from the adapter seat on the corresponding side, thereby unlocking the handle, and the switch is toggled in the reverse direction to reset the elastic connecting rod and lock it with the adapter seat on the corresponding side, thereby fixing the handle and the adapter seat.

9. The foldable trolley for easy storage and carrying as claimed in claim 1, characterized in that: The handle is a retractable structure, and the height of the handle can be adjusted by retracting.

10. An application of a foldable trolley that is easy to store and carry as claimed in any one of claims 2 to 9, characterized in that: When not in use, the handle fits the top of the first vehicle board, and the front and rear wheels are folded and fitted toward the bottom of the first vehicle board, thereby reducing the volume of the entire folding trolley; when used as a flatbed vehicle, the handle and the first vehicle board are unfolded 180 degrees, the front wheels are folded, and the rear wheels are unfolded, and items are placed on the first vehicle board to realize the function of a two-wheeled trolley; when used as a camping vehicle, the handle extends vertically upward relative to the first vehicle board, and the angle between the two is 90 degrees. The front and rear wheels are both unfolded, realizing the function of a four-wheeled vehicle.

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