WO2026044779A1 - Foldable simple forklift - Google Patents

Abstract

A foldable simple forklift, comprising: a base, having a bottom frame and a lifting/lowering frame; a moving assembly, having two support wheel frames and two wheel sets, the two support wheel frames respectively being arranged at two ends, i.e. left and right ends, of the bottom frame, and the two wheel sets respectively being pivotally arranged on the two support wheel frames; a lifting/lowering assembly, having a lifting/lowering screw, a lifting/lowering middle tube, and a lifting/lowering inner tube; a power assembly, having a gear set and a power source, the power source being operable to provide power to be transmitted to the lifting/lowering screw via the gear set so as to drive the lifting/lowering screw to rotate; and a fork assembly, having a fork crossbar and two forks. The present invention is relatively structurally simple and easy to operate, and has the function of being convenient to store and carry, effectively solving the problem that existing forklifts are not suitable for use by the general public.

Description

Foldable simple stacker Technical Field

This invention relates to a foldable, simple stacker.

Background Technology

Note: Forklifts are indispensable pieces of equipment in modern logistics and warehousing. Since their invention in the early 20th century, forklifts have played a key role in handling and lifting heavy objects, greatly improving work efficiency and safety.

Currently available forklifts integrate a variety of advanced technologies, including hydraulic technology, electronic control systems, and automation technology. These technologies have enabled forklifts to achieve significant improvements in operational precision, lifting capacity, and safety performance. The widespread adoption of electric forklifts, especially the application of lithium battery technology, has further propelled a green revolution in the forklift industry.

However, the aforementioned electric forklifts still have some problems that need to be overcome: First, they are bulky and the forks cannot be stored, thus requiring a large working or storage space. Second, they are heavy, making them more suitable for carrying heavy goods in factories, but not for carrying agricultural products such as fruits and vegetables. Third, their components are complex and expensive, making them relatively inaccessible to beginners who only want to buy one for moving ordinary items at home (such as furniture or bicycles).

Therefore, how to provide a foldable and simple stacker that can solve the problems of large space occupation, high cost, and inconvenient operation and storage of electric stackers is one of the urgent issues that manufacturers and R&D personnel in the stacker field need to address.

Summary of the Invention

The main objective of this invention is to provide a foldable and simple forklift that effectively solves the problem that conventional forklifts are not suitable for general public use.

To achieve the aforementioned objectives, the present invention provides a foldable, simple stacker, comprising: a base, a bottom frame, a lifting frame, and a power frame; the bottom frame having a first insertion hole and a second insertion hole spaced apart and extending laterally; and one end of the lifting frame being connected to the bottom frame. A frame, with one end extending vertically away from the bottom frame, wherein the lifting frame has a lifting space inside, and the power frame is located on one side of the lifting frame and away from the bottom frame; a moving component having two support wheel frames and two wheel sets, the two support wheel frames being respectively located at the left and right ends of the bottom frame, and the two wheel sets being respectively pivotally mounted on the two support wheel frames, wherein the two support wheel frames are operable to switch between a first position and a second position, when the two support wheel frames are switched to the first position, the two support wheel frames are generally perpendicular to the lifting frame, and when the two support wheel frames are switched to the second position, the two support wheel frames are generally parallel to the lifting frame; a lifting component having a lifting screw, a lifting middle tube, and a lifting inner tube, the lifting screw being rotatably located on one side of the lifting frame, the lifting middle tube being located in the lifting space of the lifting frame, one end being connected to the lifting screw and being driven by the lifting screw to move within the lifting space. The lifting frame moves up and down; the inner lifting tube is located inside the middle lifting tube and can move synchronously with the middle lifting tube; a power assembly has a gear set and a power source, the gear set is located in the power frame of the base, one end is connected to the lifting screw of the lifting assembly, the power source is located on one side of the power frame and connected to the other end of the gear set, for operation to provide power through the gear set to the lifting screw to drive the lifting screw to rotate; and a toothed fork assembly has a toothed fork crossbar and two toothed forks, the toothed fork crossbar is fixed to the inner lifting tube and is generally perpendicular to the lifting frame, the two toothed forks are pivotally mounted at both ends of the toothed fork crossbar in a rotatable manner, and can be operated to switch between a third position and a fourth position; when the two toothed forks are switched to the third position, the two toothed forks are generally perpendicular to the lifting frame, and when the two toothed forks are switched to the fourth position, the two toothed forks are generally parallel to the lifting frame.

Each of the support wheel frames has a longitudinal bar and two transverse bars, the two transverse bars being spaced a certain distance apart, one end of which is connected to the longitudinal bar, and the other end extending in a direction perpendicular to the longitudinal bar; when the support wheel frame is switched to the first position, the two transverse bars are respectively inserted into the first insertion hole and the second insertion hole of the bottom frame, and the longitudinal bar is generally perpendicular to the lifting frame; when the support wheel frame is switched to the second position, only one of the transverse bars is inserted into one of the first insertion hole and the second insertion hole of the bottom frame, and the longitudinal bar is generally parallel to the lifting frame.

The movable component has a plurality of vertical pins that detachably pass through the bottom frame and the crossbars of the two support wheel frames located at the first position to fix the two support wheel frames at the first position.

The fork crossbar has two fork slots at opposite ends for accommodating the two forks; the fork assembly further has two transverse pins that detachably pass through the two fork slots and the two forks located at the third position to fix the two forks at the third position.

The lifting assembly further includes a chain assembly having a sprocket and a chain. The sprocket is pivotally mounted on the top of the lifting middle tube, and one end of the chain is fixed to the top of the lifting frame, while the other end is fixed to the top of the lifting inner tube.

The lifting assembly further includes a roller group having a plurality of rollers arranged longitudinally and laterally. A portion of the rollers is pivotally mounted on the lifting middle tube and abuts against the inner wall of the lifting frame, while another portion of the rollers is pivotally mounted on the lifting inner tube and abuts against the lifting middle tube.

The lifting frame has a first lifting groove and a second lifting groove on opposite sides. The first lifting groove is located at the rear of the lifting frame and is connected to the lifting space. The second lifting groove is located at the front of the lifting frame and is connected to the lifting space. The bottom end of the lifting middle tube has a screw slider that extends from the first lifting groove and is connected to the lifting screw. The top end of the lifting inner tube has a toothed fork slider that extends from the second lifting groove and is connected to the toothed fork crossbar.

The present invention further includes a clamping accessory detachably connected to the two forks of the fork assembly; the clamping accessory has a clamping base, two clamping arms and a top abutment, the clamping base has two through holes for the two forks to pass through, the two clamping arms are located at both ends of the clamping base for clamping two wheels of a bicycle, and the top abutment is located in the center of the clamping base for clamping one frame of the bicycle.

The clamping base has a horizontal extension and two front extensions. The two front extensions extend on both sides of the horizontal extension and in a direction perpendicular to the horizontal extension. Each of the two clamping arms has a rotating part and a gripper. One end of the two rotating parts is pivotally mounted on the two front extensions, and the other end is provided with the gripper.

The abutment is an L-shaped component, which is fitted onto an upper extension of the clamping base and can be raised and lowered relative to the upper extension. One end of the abutment is provided with an adjustment component for operation to switch the abutment between a movable state and a fixed state.

The fork assembly further includes a steering mechanism, which has a shaft that passes through the fork crossbeam and the inner tube. The fork assembly can be driven to rotate from the third position to a fifth position around the shaft. When the fork assembly rotates to the fifth position, the fork crossbeam is generally parallel to the lifting frame, and the two forks extend forward along the upper and lower ends of the fork crossbeam, respectively.

The fork crossbar has a downwardly extending extension on one side adjacent to the lifting frame; the inner tube has a fork slider that extends from the lifting frame and is connected to the extension of the fork crossbar, so that the shaft fastener passes through the extension and the fork slider.

The fork slider is provided with a positioning hole in both the vertical and horizontal directions; the steering mechanism further includes a positioning pin that detachably passes through the extension when the fork assembly is in the third position. The extension and the positioning hole of the fork slider in the vertical direction; when the fork assembly is in the fifth position, the extension and the positioning hole of the fork slider in the horizontal direction are detachably inserted.

The steering mechanism further includes a pin seat located on the side of the extension away from the fork slider; the positioning pin sequentially passes through the pin seat, the extension of the fork crossbar, and one of the positioning holes of the fork slider in a detachable manner.

The present invention has a relatively simple structure, is easy to operate, and has the function of convenient storage and carrying, effectively solving the problem that conventional forklifts are not suitable for general public use.

Attached Figure Description

Figure 1 is a perspective view of a first preferred embodiment of the present invention.

Figure 2 is a perspective view of the first preferred embodiment of the present invention from another angle.

Figure 3 is a cross-sectional view of the first preferred embodiment of the present invention.

Figure 4 is a partial enlarged view of the first preferred embodiment of the present invention.

Figure 5 is a disassembly diagram of the first preferred embodiment of the present invention.

Figure 6 is a schematic diagram of the storage of the first preferred embodiment of the present invention.

Figure 7 is a schematic diagram of the toothed fork assembly after rotating 90 degrees according to the first preferred embodiment of the present invention.

Figure 8 is a perspective view of a clamping accessory according to a second preferred embodiment of the present invention.

Figure 9 is a schematic diagram of the use of the clamping accessory of the second preferred embodiment of the present invention.

Symbol Explanation

1--Foldable simple stacker 2--Bicycle 2A--Wheels 2B--Frame

10--Base 11--Bottom Frame 111--First Socket 112--Second Socket

12--Lifting frame 120--Lifting space 121--First lifting slot 122--Second lifting slot

13--Power Frame 14--Handle 20--Moving Component 21--Support Wheel Frame

210--Longitudinal bar 211--Horizontal bar 22--Wheelset 220--Main wheel

221--Auxiliary wheel 23--Vertical pin 30--Lifting assembly 31--Lifting screw

310 -- External thread; 32 -- Lifting tube; 320 -- Screw slider; 321 -- Bushing

322--Middle tube cover; 33--Lifting inner tube; 330--Tooth fork slider; 331--Positioning hole

34--Chain assembly 340--Sprocket 341--Chain 35--Roller assembly

350 -- Roller 40 -- Power Component 41 -- Gear Set 42 -- Power Source

50--Fork assembly; 51--Fork crossbar; 510--Support crossbar; 511--Fork groove

512--Extension section 52--Tooth fork 53--Steering mechanism 530--Shaft fastener

531--Pin holder 532--Positioning pin 54--Horizontal pin 60--Clamping accessory

61--Clamping base; 610--Lateral extension; 611--Front extension; 612--Upper extension

613--Through hole; 62--Clamping arm; 620--Rotating part; 621--Clamping jaw

63--Top stop component 630--Adjusting component

Detailed Implementation

The following description with reference to the accompanying drawings represents a preferred embodiment of the present invention. It should be understood that these drawings and descriptions are for illustrative purposes only and are not intended to limit the invention. Furthermore, the terms "upper" and "lower," "left" and "right," "front" and "rear," "first" and "second," etc., used in the specification are to clearly indicate the relative positions between components or mechanisms and are not intended to be limiting.

Please refer to Figures 1 to 4. A foldable, simple stacker 1 provided in a first preferred embodiment of the present invention mainly comprises: a base 10, a moving component 20, a lifting component 30, a power component 40, and a fork assembly 50. Wherein:

The base 10 has a base frame 11, a lifting frame 12, a power frame 13, and a handle 14. The base frame 11 is a generally rectangular frame with a first insertion hole 111 and a second insertion hole 112 extending laterally and passing through both ends of the base frame 11. The first insertion hole 111 and the second insertion hole 112 are spaced apart by a certain distance, and the first insertion hole 111 is located behind the second insertion hole 112. The lifting frame 12 is a hollow square tubular component, with one end connected to the base frame 11 and the other end extending vertically away from the base frame 11. The lifting frame 12 has a lifting space 120 inside, and a first lifting groove 121 and a second lifting groove 122 are respectively located on opposite sides. The first lifting groove 121 is located behind the lifting frame 12, and the second lifting groove 122 is located in front of the lifting frame 12, and the first lifting groove 121 and the second lifting groove 122 are respectively connected to the lifting space 120. The power frame 13 is located on one side of the lifting frame 12 and away from the bottom frame 11, and is used to house the power assembly 40. The handle 14 is a laterally extending rod located at one end of the lifting frame 12 away from the bottom frame 11 and extends to the left and right sides for the user to grip.

The movable component 20 has two support wheel frames 21 and two wheel sets 22. The two support wheel frames 21 are respectively disposed on the left and right sides of the bottom frame 11 of the base 10. Each support wheel frame 21 has a longitudinal rod 210 and two transverse rods 211. The two transverse rods 211 are spaced apart from each other, with one end connected to the longitudinal rod 210 and the other end extending vertically. The two support wheel frames 21 extend perpendicularly to the direction of the longitudinal rod 210. Under normal conditions, the two support wheel frames 21 are generally perpendicular to the lifting frame 12 of the base 10, and the two crossbars 211 of each support wheel frame 21 are inserted along the adjacent first insertion hole 111 and second insertion hole 112 of the bottom frame 11. The moving assembly 20 further includes a plurality of vertical pins 23 that detachably pass through the bottom frame 11 and the crossbars 211 of the two support wheel frames 21 to fix the two support wheel frames 21 in a horizontal position. The two wheel sets 22 are respectively pivotally mounted on the two support wheel frames 21. In this embodiment, each wheel set 22 has a main wheel 220 and a secondary wheel 221. The main wheel 220 is pivotally mounted at the rear end of the longitudinal rod 210, and the secondary wheel 221 is pivotally mounted at the front end of the longitudinal rod 210. In another embodiment, the number and position of the main wheel and the secondary wheel can be adjusted as needed.

The lifting assembly 30 includes a lifting screw 31, a lifting middle tube 32, a lifting inner tube 33, a chain assembly 34, and a roller assembly 35. The lifting screw 31 is located behind the lifting frame 12 and adjacent to the first lifting groove 121, and its extension direction is generally parallel to the extension direction of the lifting frame 12. The outer surface of the lifting screw 31 has a plurality of external threads 310. The lifting middle tube 32 is a hollow square tube that is movably disposed in the lifting space 120 of the lifting frame 12. The bottom end of the lifting middle tube 32 has an integrally formed screw slider 320 that extends from the first lifting groove 121 and is sleeved on the lifting screw 31, so as to be driven by the lifting screw 31 to move the lifting middle tube 32 up and down. In this embodiment, a bushing 321 is further included between the screw slider 320 and the lifting screw 31 to assist the screw sleeve 320 in engaging with the lifting screw 31. A middle tube cover 322 is also provided at the top of the lifting middle tube 32. The lifting inner tube 33 is a hollow square tube, movably disposed in the lifting space 120 of the lifting frame 12, and located inside the lifting middle tube 32. A toothed fork slider 330 is provided at the top of the lifting inner tube 33, extending from the second lifting groove 122 of the lifting frame 12 and connected to the toothed fork assembly 50, so that the lifting inner tube 33 and the toothed fork assembly 50 are fixed but can move synchronously. In this embodiment, the toothed fork slider 330 is a plate approximately quarter-circular in shape, and the toothed fork slider 330 has a positioning hole 331 in both the vertical and horizontal directions. The chain assembly 34 includes a sprocket 340 and a chain 341. The sprocket 340 is pivotally mounted on the top of the lifting tube 32, and one end of the chain 341 is fixed to the top of the lifting frame 12, while the other end is fixed to the top of the inner lifting tube 33. Since the length of the chain 341 is fixed, when the lifting tube 32 is driven to move upwards/downwards, the chain 341 rotates on the sprocket 340, thereby causing the inner lifting tube 33 to move synchronously with the lifting tube 32. The roller assembly 35 is located within the lifting space 120 of the lifting frame 12 and includes a plurality of rollers 350 arranged longitudinally and laterally. A portion of these rollers 350 are pivotally mounted on the lifting tube 32 and abut against the inner wall of the lifting frame 12 to reduce friction between the lifting tube 32 and the lifting frame 12 due to relative movement. The other part of the rollers 350 is pivotally mounted on the inner lifting tube 33 and abuts against the middle lifting tube 32 to reduce friction between the inner lifting tube 33 and the middle lifting tube 32 caused by relative movement.

The power assembly 40 is disposed in the power frame 13 of the base 10 and has a gear set 41 and a power source 42. The gear set 41 is composed of a plurality of gears disposed in the power frame 13, and one end is connected to the lifting screw 31 of the lifting assembly 30. The power source 42 is disposed on one side of the power frame 13 and connected to the other end of the gear set 41, and is used to provide power to the gear set 41 for operation. In this embodiment, the power source 42 is a joystick, which provides rotational power by the user rotating the joystick. In another embodiment, the power source can be the joystick replaced with an external power tool, which provides rotational power by the user. Thus, the user can generate power by operating the power source 42 and transmit the power to the lifting screw 31 through the gear set 41 to drive its rotation, thereby causing the lifting middle tube 32 and the lifting inner tube 33 to move up and down in the lifting frame 12.

The fork assembly 50 includes a fork crossbar 51, two forks 52, and a steering mechanism 53. The fork crossbar 51 is movably connected to the lifting assembly 30 and can be driven by the lifting assembly 30 to move up and down synchronously relative to the base frame 11. Specifically, the fork crossbar 51 has a support crossbar 510 and two fork slots 511. The support crossbar 510 is a hollow rod with a downwardly extending extension 512 on one side near the lifting frame 12, which fits against the fork slider 330 of the lifting inner tube 33. The two fork slots 511 are two generally U-shaped tubular members, respectively located at the left and right ends of the support crossbar 510 and extending forward. One end of each fork 52 is pivotally mounted in the two fork slots 511, and the other end extends forward. Under normal conditions, the two forks 52 are generally parallel to the base frame 11. The steering mechanism 53 includes a shaft fastener 530, a pin seat 531, and a positioning pin 532. In this embodiment, the shaft fastener 530 is a bolt that rotatably passes through the extension 512 of the fork crossbar 51 and the fork slider 330, allowing the fork assembly 50 to rotate around the shaft fastener 530. The pin seat 531 is a single piece and is secured to the extension 512 by two screws. The positioning pin 532 detachably passes through the pin seat 531, the extension 512 of the fork crossbar 51, and the positioning hole 331 of the fork slider 330 in the vertical direction, and can be pulled out to detach from the fork crossbar 51 and the fork slider 330, allowing the fork assembly 50 to rotate relative to the fork slider 330. The toothed fork assembly 50 further includes two transverse pins 54, which are detachably inserted through the two toothed fork slots 511 and the two toothed forks 52, respectively, to fix the two toothed forks 52 in a horizontal position.

Based on the above structural configuration, when using the foldable simple stacker 1 provided by the present invention, the user only needs to place the item on the two forks 52 of the fork assembly 50 and operate the power source 42 (e.g., In this embodiment, the joystick is rotated to drive the lifting screw 31 to rotate. At this time, because the screw slider 320 of the lifting tube 32 engages with the lifting screw 31, the lifting tube 32 is driven to move upwards. Simultaneously, the structure of the chain assembly 34 of the lifting assembly 30 forces the lifting tube 32 and the inner lifting tube 33 to move together, causing the inner lifting tube 33 to move synchronously with the lifting tube 32. Furthermore, the fork assembly 50 is connected to the fork slider 330 of the inner lifting tube 33, causing the fork assembly 50 to move synchronously with the inner lifting tube 33. In other words, the user only needs to operate the power source 42 to control the fork assembly 50 to move upwards to lift the item to the desired height, and after completing the handling operation, reverse the operation of the power source 42 to control the fork assembly 50 to return to its original position.

It is worth noting that the foldable simple stacker provided by this invention has the added benefit of being foldable and portable compared to traditional stackers. Specifically, when the foldable simple stacker 1 is in use, the two support wheel frames 21 are in a first position (as shown in Figure 1), at which time the two support wheel frames 21 are parallel to the base frame 11 and perpendicular to the lifting frame 12, so that the main wheels 220 and the auxiliary wheels 221 simultaneously contact the ground. The two forks 52 are in a third position (as shown in Figure 1), at which time the two forks 52 are parallel to the base frame 11 and perpendicular to the lifting frame 12, so that the top surface of the two forks 52 can be used to support objects. Next, please refer to Figures 5 and 6. When the foldable simple stacker 1 is finished and needs to be stored, the user can pull out the vertical pins 23 of the moving component 20 to make the two support wheel frames 21 movable. After pulling out the two support wheel frames 21 to the left and right ends, rotate them 90 degrees from the first position. Then, insert the crossbar 211 at the bottom of each support wheel frame 21 into the adjacent first insertion hole 111 to switch the two support wheel frames 21 to a second position (as shown in Figure 5). At this time, the two support wheel frames 21 are perpendicular to the bottom frame 111 and parallel to the lifting frame 12. Only the main wheels 220 are in contact with the ground, while the auxiliary wheels 221 are suspended in the air. Next, the user can pull out the lateral pin 54 of the fork assembly 50, making the two forks 52 movable, and rotate the two forks 52 upwards by 90 degrees from the third position, switching the two forks 52 to a fourth position (as shown in Figure 5). At this time, the two forks 52 are perpendicular to the fork slot 511 and parallel to the lifting frame 12. In this way, the two support wheel frames 21 and the two forks 52 can be moved from the horizontal position (first position, third position) to the vertical position (second position, fourth position), effectively reducing the footprint of the foldable simple stacker 1, making it convenient for subsequent storage or for the user to carry and move via the handle 14.

It is particularly important to note that, in addition to being able to move items in the third position extending horizontally, the fork assembly 50 can also be driven to rotate about the shaft fastener 512 to a fifth position extending vertically. Referring to Figure 7, when the fork assembly 50 rotates to the fifth position, the fork assembly... The support crossbar 510 of the fork assembly 50 is parallel to the lifting frame 12, and the two forks 52 extend forward in a direction perpendicular to the lifting frame 12, one above the other. Specifically, when the user wants to rotate the fork assembly 50 from its original horizontal position, the positioning pin 532 needs to be pulled out, and the shaft fastener 530 needs to be slightly loosened, so that the fork assembly 50 changes from a horizontally fixed state to a movable state. Next, the user rotates the fork assembly 50 90 degrees around the shaft fastener 530 to the fifth position perpendicular to the ground, so that the support crossbar 510 of the fork assembly 50 is parallel to the lifting frame 12. After rotating to the fifth position, the user can reinsert the positioning pin 532 into the horizontal positioning hole 331 of the fork slider 330, so that the fork assembly 50 and the fork slider 330 are fixed again. In this way, the fork assembly 50 can be used to transport items in a vertically extended state.

Referring to Figure 8, the foldable simple stacker 1 provided in a second preferred embodiment of the present invention further includes a separate clamping accessory 60. This clamping accessory 60 is detachably connected to the two forks 52 of the fork assembly 50 for clamping a bicycle. Specifically, the clamping accessory 60 has a clamping base 61, two clamping arms 62, and a top abutment 63. The clamping base 61 has a horizontal extension 610, two front extensions 611, and an upper extension 612. The two front extensions 611 are located at both ends of the horizontal extension 610 and extend forward. The upper extension 612 is located in the center of the horizontal extension 610 and extends upward. The clamping base 61 is further provided with two through holes 613, located at both ends of the transverse extension 610 and passing through the interior of the two front extensions 611 respectively, for the two forks 52 to pass through the two through holes 613 into the interior of the two front extensions 611 to fix the clamping accessory 60 to the two forks 52. The two clamping arms 62 are rotatably provided at one end of the two front extensions 611 of the clamping base 61 to fix the bicycle wheel. In this embodiment, each clamping arm 62 has a rotating part 620 and a gripper 621. One end of the rotating part 620 is pivotally mounted at one end of the front extension 611, and the other end is provided with the gripper 621. The abutment 63 is an L-shaped tubular member, sleeved on the upper extension 612 of the clamping base 61, and can be raised and lowered relative to the upper extension 612 to clamp the bicycle frame. An adjustment member 630 is provided between the abutment 63 and the upper extension 612, which can be operated to make the abutment 63 in a movable state and a fixed state relative to the upper extension 612. In this embodiment, the adjustment member 630 is a lever.

When a user uses the foldable simple stacker 1 of this invention, combined with the clamping accessory 60, to clamp a bicycle 2, the clamping accessory 60 is first fixed to the two-pronged fork 52. Then, referring to Figure 9, the user positions the lateral extension 610 of the clamping base 61 between the two wheels 2A of the bicycle 2, rotates the two clamping arms 62 until they abut against the two wheels 2A, and clamps the two wheels 2A using the two grippers 621. Next, the user can release the adjusting member 630 to make the abutment member 63 movable. The top abutment 63 is raised and lowered until its bottom end abuts against the top of the frame 2B of the bicycle 1, and then the adjusting member 630 is adjusted to fix the top abutment 63. In this way, the clamping accessory 60 can stably clamp the bicycle 2, thereby allowing the bicycle 2 to be lifted to the desired position by the two-pronged fork 52.

In summary, the foldable and simple stacker provided by this invention achieves convenient storage and portability through the structure of the two forks and the two support wheels, which can switch between horizontal and vertical positions. Furthermore, the addition of the clamping accessory enables the stacker of this invention to transport bicycles.

Claims (14)

A foldable, simple stacker, characterized in that it comprises: A base has a bottom frame, a lifting frame and a power frame. The bottom frame has a first socket and a second socket that are spaced apart and pass through the horizontal direction. One end of the lifting frame is connected to the bottom frame and the other end extends in a vertical direction away from the bottom frame. The lifting frame has a lifting space inside. The power frame is located on one side of the lifting frame and away from the bottom frame. A movable component has two support wheel frames and two wheel sets. The two support wheel frames are respectively located at the left and right ends of a base frame, and the two wheel sets are respectively pivotally mounted on the two support wheel frames. The two support wheel frames are operable to switch between a first position and a second position. When the two support wheel frames are switched to the first position, the two support wheel frames are generally perpendicular to the lifting frame; when the two support wheel frames are switched to the second position, the two support wheel frames are generally parallel to the lifting frame. A lifting assembly includes a lifting screw, a lifting middle tube, and a lifting inner tube. The lifting screw is rotatably disposed on one side of the lifting frame. The lifting middle tube is disposed in the lifting space of the lifting frame, with one end connected to the lifting screw and driven by the lifting screw to move up and down in the lifting frame. The lifting inner tube is disposed inside the lifting middle tube and can move synchronously with the lifting middle tube. A power assembly has a gear set and a power source. The gear set is located in the power frame of the base and one end is connected to the lifting screw of the lifting assembly. The power source is located on one side of the power frame and connected to the other end of the gear set. It is used to provide power through the gear set to the lifting screw to drive the lifting screw to rotate. And a toothed fork assembly having a toothed fork crossbar and two toothed forks, the toothed fork crossbar being fixed to the lifting inner tube and generally perpendicular to the lifting frame, the two toothed forks being pivotally mounted at both ends of the toothed fork crossbar in a rotatable manner and operable to switch between a third position and a fourth position; when the two toothed forks are switched to the third position, the two toothed forks are generally perpendicular to the lifting frame, and when the two toothed forks are switched to the fourth position, the two toothed forks are generally parallel to the lifting frame. According to claim 1, the foldable simple stacker is characterized in that each support wheel frame has a longitudinal bar and two transverse bars, the two transverse bars are spaced a certain distance apart, one end is connected to the longitudinal bar, and the other end extends in a direction perpendicular to the longitudinal bar; when the support wheel frame is switched to the first position, the two transverse bars are respectively inserted into the first insertion hole and the second insertion hole of the bottom frame, and the longitudinal bar is generally perpendicular to the lifting frame; when the support wheel frame is switched to the second position, only one of the transverse bars is inserted into one of the first insertion hole and the second insertion hole of the bottom frame, and the longitudinal bar is generally parallel to the lifting frame. The foldable simple stacker according to claim 1 is characterized in that the moving component has a plurality of vertical pins that can be detachably inserted through the bottom frame and the crossbars of the two support wheel frames located at the first position to fix the two support wheel frames at the first position. The foldable simple stacker according to claim 1 is characterized in that the two opposite ends of the fork crossbar have two fork slots for accommodating the two forks; the fork assembly further has two transverse pins that detachably pass through the two fork slots and the two forks located at the third position to fix the two forks at the third position. The foldable simple stacker according to claim 1 is characterized in that the lifting assembly further includes a chain assembly having a sprocket and a chain, the sprocket being pivotally mounted on the top of the lifting middle tube, one end of the chain being fixed to the top of the lifting frame, and the other end being fixed to the top of the lifting inner tube. The foldable simple stacker according to claim 1 is characterized in that the lifting assembly further includes a roller group having a plurality of rollers arranged longitudinally and laterally, a portion of which is pivotally mounted on the lifting middle tube and abuts against the inner wall of the lifting frame, and another portion of which is pivotally mounted on the lifting inner tube and abuts against the lifting middle tube. According to claim 1, the foldable simple stacker is characterized in that the lifting frame has a first lifting groove and a second lifting groove on opposite sides, the first lifting groove is located behind the lifting frame and communicates with the lifting space, and the second lifting groove is located in front of the lifting frame and communicates with the lifting space; wherein the bottom end of the lifting middle tube has a screw slider that extends from the first lifting groove and is connected to the lifting screw; the top end of the lifting inner tube has a toothed fork slider that extends from the second lifting groove and is connected to the toothed fork crossbar. The foldable simple stacker according to claim 1 is characterized in that it further includes a clamping accessory, which is detachably connected to the two forks of the fork assembly; the clamping accessory has a clamping base, two clamping arms and a top abutment, the clamping base has two through holes for the two forks to pass through, the two clamping arms are located at both ends of the clamping base for clamping two wheels of a bicycle, and the top abutment is located in the center of the clamping base for clamping one frame of the bicycle. The foldable simple stacker according to claim 8 is characterized in that the clamping base has a horizontal extension and two front extensions, the two front extensions are on both sides of the horizontal extension and extend in a direction perpendicular to the horizontal extension; each of the two clamping arms has a rotating part and a gripper, one end of the two rotating parts is pivotally mounted on the two front extensions, and the other end is provided with the gripper. According to claim 8, the foldable simple stacker is characterized in that the top abutment is an L-shaped component, sleeved on an upper extension portion extending upward from the clamping base, and can be raised and lowered relative to the upper extension portion; one end of the top abutment is provided with an adjustment component for operation to switch the top abutment between a movable state and a fixed state. According to claim 1, the foldable simple stacker is characterized in that the fork assembly further includes a steering mechanism, the steering mechanism having a shaft fastener passing through the fork crossbeam and the inner tube; the fork assembly can be driven to rotate from the third position to a fifth position around the shaft fastener, when the fork assembly rotates to the fifth position, the fork crossbeam is generally parallel to the lifting frame, and the two forks extend forward along the upper and lower ends of the fork crossbeam respectively. The foldable simple stacker according to claim 11 is characterized in that the fork crossbeam has a downwardly extending extension on one side adjacent to the lifting frame; the inner tube further has a fork slider extending from the lifting frame and connected to the extension of the fork crossbeam, for the shaft fastener to pass through the extension and the fork slider. The foldable simple stacker according to claims 11 and 12 is characterized in that the fork slider is provided with a positioning hole in both the vertical and horizontal directions; the steering mechanism further includes a positioning pin that, when the fork assembly is in the third position, detachably passes through the extension and the positioning hole in the vertical direction of the fork slider; and, when the fork assembly is in the fifth position, detachably passes through the extension and the positioning hole in the horizontal direction of the fork slider. The foldable simple stacker according to claims 11 and 13 is characterized in that the steering mechanism further includes a pin seat disposed on the side of the extension away from the toothed fork slider; the positioning pin sequentially passes through the pin seat, the extension of the toothed fork crossbeam and one of the positioning holes of the toothed fork slider in a detachable manner.