Lifting device

Abstract

The utility model relates to the technical field of vehicle accessories, and provides a lifting device which comprises a bearing part, a movable part and a fixed part, one end of the bearing part is movably connected to the first side of the movable part, a first connecting part is arranged between the bearing part and the movable part, and a second connecting part is arranged between the bearing part and the movable part. One end of the fixed part is movably connected to the second side of the movable part, a second connecting part is arranged between the fixed part and the movable part, and the bearing part can move between a folding position above the fixed part and an extending position below the fixed part relative to the fixed part. A user only needs to place a heavy object on the bearing part and fix the fixed part on a car roof, the object can be lifted to the height of the car roof through the relative movement of the bearing part, the movable part and the fixed part, manual lifting is not needed, the operation difficulty is greatly reduced, and the lifting device is particularly suitable for loading and unloading heavy or large-size objects, and the bearing part, the movable part and the fixed part form a three-stage linkage structure; heavy objects are always kept stable, and the transportation safety is improved.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle parts technology, and in particular relates to a lifting device. Background Technology

[0002] Currently, the interior space of conventional passenger vehicles is limited by design dimensions, making it difficult to accommodate oversized items such as skis, bicycles, and large suitcases. To address these transportation needs, existing technologies generally rely on roof racks or longitudinal beam devices, using straps, buckles, and other securing mechanisms to the roof area. However, this solution requires users to manually lift the items to the roof height and install them, and then reverse the process to disassemble them afterward. For excessively heavy or bulky items (such as tent frames or heavy toolboxes), this process has significant drawbacks: firstly, manually lifting heavy objects to the roof requires considerable physical strength, easily leading to muscle strain or accidental falls; secondly, with the center of gravity raised, if the items are not securely fixed, they can easily sway or even fall off while driving, threatening driving safety. Existing improvements mostly focus on optimizing the securing structure, but do not fundamentally solve the problem of reliance on manual labor during loading and unloading. Some vehicles have attempted to integrate simple lifting devices, but these are complex in structure, occupy a large amount of space, and are expensive, making them unsuitable for most family car models.

[0003] To solve the above-mentioned technical problems, this utility model designs a lifting device. Utility Model Content

[0004] This utility model provides a lifting device, which aims to solve the problems of complex structure, large space occupation and high cost of roof rack lifting devices.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a lifting device, comprising a supporting member, a movable member, and a fixing member, wherein one end of the supporting member is movably connected to a first side of the movable member, a first connecting member is provided between the supporting member and the movable member, one end of the fixing member is movably connected to a second side of the movable member, a second connecting member is provided between the fixing member and the movable member, and the supporting member is capable of moving relative to the fixing member between a folded position above the fixing member and an extended position below the fixing member.

[0006] Based on the above technical solution, the first connecting member includes a first connecting rod, a second connecting rod, a third connecting rod, and a fourth connecting rod. One end of the first connecting rod is rotatably connected to the bearing member. The other end of the first connecting rod is rotatably connected to one end of the second connecting rod. The other end of the second connecting rod is rotatably connected to one end of the third connecting rod. The other end of the third connecting rod is rotatably connected to one end of the fourth connecting rod. Both ends of the third connecting rod are slidably connected to the movable member. The other end of the fourth connecting rod is rotatably connected to the middle part of the first connecting rod.

[0007] Furthermore, there are two third links and two fourth links. The two third links are arranged opposite each other on both sides of the second link, and the two fourth links are arranged opposite each other on both sides of the first link. When the carrier moves from the folded position to the extended position, it drives the first link to rotate, which in turn drives the second link and the two fourth links to rotate simultaneously. This causes the third link to slide relative to the movable member, so that the carrier moves to the extended position.

[0008] Based on the above technical solution, the second connecting member includes a fifth link and a sixth link arranged opposite to each other. One end of the fifth link and the sixth link is rotatably connected to the movable member, and the other end of the fifth link and the sixth link is rotatably and slidably connected to the fixed member.

[0009] Furthermore, the fixing member is provided with a sliding groove, and a sliding engagement block is provided in the sliding groove. The sliding engagement block can slide relative to the sliding groove, and one end of the sliding engagement block is rotatably connected to the other end of the fifth link and the sixth link.

[0010] Preferably, the movable component is provided with a limiting slot, and the fifth connecting rod is provided with a limiting protrusion. When the carrier moves to the extended position, the limiting protrusion engages with the limiting slot to restrict the movable component from continuing to move relative to the fixed component.

[0011] Based on the above technical solution, the lifting device also includes a drive mechanism, which includes a drive component and a transmission component. The drive component is located at the end of the carrier component away from the movable component when it is in the extended position. One end of the transmission component is connected to the drive component, and the other end extends sequentially along the carrier component and the movable component to the fixed component. The rotation of the drive component drives the transmission component to move, which can drive the carrier component to move from the folded position to the extended position and from the extended position to the folded position.

[0012] Based on the above technical solution, the lifting device further includes a transmission mechanism, which includes a transmission rack, a first transmission mating part, and a second transmission mating part. The first transmission mating part is located on the side of the movable part near the bearing member and is rotatably connected to the bearing member. The second transmission mating part is located on the side of the movable part near the fixed member and is rotatably connected to the fixed member. Both ends of the movable part are provided with transmission shafts. The transmission rack includes a first rack and a second rack. The first rack is sequentially located at one end of the first transmission mating part, the transmission shaft at one end of the movable part, and one end of the second transmission mating part. The second rack is sequentially located at the other end of the first transmission mating part, the transmission shaft at the other end of the movable part, and the other end of the second transmission mating part.

[0013] Based on the above technical solution, the number of the bearing component, the movable component, and the fixing component are all two, a first connecting rod is provided between the two bearing components, and a second connecting rod is provided between the two movable components.

[0014] Furthermore, both the first connecting rod and the second connecting rod are telescopic rods to adjust the distance between the two load-bearing members and between the two moving members.

[0015] Compared with related technologies, the beneficial effects of this utility model are as follows:

[0016] In this invention, the carrier component moves relative to the movable component under the connection of the first connecting component, and the movable component moves relative to the fixed component under the connection of the second connecting component. During the movement of the carrier component and the movable component, the carrier component can move between the folded position and the extended position. In use, the user only needs to place the heavy object on the carrier component and fix the fixed component to the roof. The relative movement of the carrier component, the movable component, and the fixed component will lift the item to the roof height, eliminating the need for manual lifting, greatly reducing physical exertion and operational difficulty. It is especially suitable for loading and unloading heavy or large-volume items. Moreover, the carrier component, the movable component, and the fixed component form a three-level linkage structure, ensuring that the heavy object remains stable throughout the lifting path, avoiding the risk of tilting or slipping that may occur with traditional manual handling, and significantly improving transportation safety. By setting the first and second connecting components, the device occupies a small space in both the folded and extended positions, which does not affect the daily use of the vehicle and can efficiently complete the lifting task. It is suitable for the roof installation requirements of most vehicle models. In addition, the lifting device has a simple structure, does not require a complex power system, reduces manufacturing costs, and improves loading and unloading efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of a lifting device provided by this utility model;

[0019] Figure 2 This is a schematic diagram of another lifting device structure provided by this utility model;

[0020] Figure 3 This utility model provides Figure 2 A schematic diagram of the cross-sectional structure along the AA direction shown in the figure;

[0021] Figure 4 This utility model provides Figure 3 An enlarged structural diagram of part A shown in the figure;

[0022] Figure 5 This utility model provides Figure 3 An enlarged structural diagram of part B shown in the figure;

[0023] Figure 6 This utility model provides Figure 1 An enlarged structural diagram of section C shown in the figure;

[0024] Figure 7 This is a schematic diagram of the structure of a lifting device bearing component located in the folded position provided by this utility model;

[0025] Figure 8 This utility model provides Figure 2 A schematic diagram of the cross-sectional structure along the BB direction shown in the figure;

[0026] Figure 9 This utility model provides Figure 8 An enlarged structural diagram of part D shown in the figure;

[0027] Figure 10 This utility model provides Figure 8 An enlarged structural diagram of part E shown in the figure;

[0028] Figure 11 This is a schematic diagram of another lifting device bearing component provided by this utility model in the folded position;

[0029] Figure 12 This utility model provides Figure 11 A schematic diagram of the cross-sectional structure along the CC direction shown in the figure;

[0030] Figure 13 This utility model provides Figure 12 The enlarged structural diagram of part F shown in the figure.

[0031] In the diagram: 1. Bearing component; 2. Moving component; 21. Limiting slot; 3. Fixing component; 31. Sliding groove; 32. Sliding mating block; 4. First connecting component; 41. First connecting rod; 42. Second connecting rod; 43. Third connecting rod; 44. Fourth connecting rod; 5. Second connecting component; 51. Fifth connecting rod; 511. Limiting protrusion; 52. Sixth connecting rod; 6. Driving component; 7. First transmission mating part; 71. Second transmission mating part; 72. Transmission shaft; 8. First connecting rod; 81. Second connecting rod; 9. Locking mating part; 91. Locking limiting part; 92. Locking driving part; 93. Locking elastic part. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and examples:

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Combination Figure 1-7 As shown, this embodiment of the present disclosure provides a lifting device, including a support member 1, a movable member 2, and a fixing member 3. One end of the support member 1 is movably connected to a first side of the movable member 2. A first connecting member 4 is provided between the support member 1 and the movable member 2. One end of the fixing member 3 is movably connected to a second side of the movable member 2. A second connecting member 5 is provided between the fixing member 3 and the movable member 2. The support member 1 can move relative to the fixing member 3 between a folded position above the fixing member 3 and an extended position below the fixing member 3.

[0037] Using the lifting device provided in this embodiment, the carrier 1 moves relative to the movable part 2 under the connection of the first connecting part 4, and the movable part 2 moves relative to the fixed part 3 under the connection of the second connecting part 5. During the movement of the carrier 1 and the movable part 2, the carrier 1 can move between the folded position and the extended position. In use, the user only needs to place the heavy object on the carrier 1 and fix the fixed part 3 to the roof. The relative movement of the carrier 1, the movable part 2 and the fixed part 3 can lift the object to the height of the roof. No manual lifting is required. The user only needs to push the folded carrier 1 and the movable part 2 relative to the fixed part 3 into the fixed position, which greatly reduces physical exertion and operational difficulty. It is especially suitable for loading and unloading heavy or large-volume items. Moreover, the carrier 1, the movable part 2 and the fixed part 3 form a three-level linkage structure to ensure that the heavy object remains stable in the lifting path, avoiding the risk of tilting or slipping that may be caused by traditional manual handling, and significantly improving transportation safety. By setting the first connector 4 and the second connector 5, the device occupies a small space in both the folded and extended positions, which does not affect the daily use of the vehicle and can efficiently complete the lifting task. It is suitable for the roof installation needs of most vehicle models. Moreover, the lifting device has a simple structure, does not require a complex power system, reduces manufacturing costs, and improves loading and unloading efficiency.

[0038] Based on the above technical solutions, such as Figure 3 and Figure 4 As shown, the first connecting member 4 includes a first connecting rod 41, a second connecting rod 42, a third connecting rod 43, and a fourth connecting rod 44. One end of the first connecting rod 41 is rotatably connected to the bearing member 1. The other end of the first connecting rod 41 is rotatably connected to one end of the second connecting rod 42. The other end of the second connecting rod 42 is rotatably connected to one end of the third connecting rod 43. The other end of the third connecting rod 43 is rotatably connected to one end of the fourth connecting rod 44. Both ends of the third connecting rod 43 are slidably connected to the movable member 2. The other end of the fourth connecting rod 44 is rotatably connected to the middle part of the first connecting rod 41.

[0039] The linkage mechanism is formed by the rotatable connection between the first link 41 and the load-bearing component 1, the multi-stage link hinge, and the double sliding constraint of the third link 43. This ensures that the load-bearing component 1 moves smoothly along a preset path during lifting and lowering, avoiding deviation or swaying. The first to fourth links 44 can distribute the operating force applied by the user through multiple nodes, significantly reducing the load pressure at a single hinge point. This improves structural durability and makes lifting heavy objects easier. The sliding connection between the two ends of the third link 43 and the moving component 2 further optimizes the force transmission direction and reduces motion friction. Secondly, the folding layout of the first to fourth links 44 allows the components to be compactly folded when the device is in the folded position, occupying almost no extra roof space. When extended, it is unfolded through the rotatable connection between the fourth link 44 and the middle of the first link 41, maximizing the balance between lifting stroke and structural stability.

[0040] Furthermore, there are two third connecting rods 43 and two fourth connecting rods 44. The two third connecting rods 43 are positioned opposite each other on both sides of the second connecting rod 42, and the two fourth connecting rods 44 are positioned opposite each other on both sides of the first connecting rod 41. When the carrier 1 moves from the folded position to the extended position, it drives the first connecting rod 41 to rotate. This rotation, in turn, drives the second connecting rod 42 and the two fourth connecting rods 44 to rotate simultaneously. This causes the third connecting rods 43 to slide relative to the movable member 2, allowing the carrier 1 to move to the extended position. The two third connecting rods 43 and the four fourth connecting rods 44, respectively positioned on both sides of the second connecting rod 42 and the first connecting rod 41, further improve the stability of the lifting device during movement.

[0041] Based on the above technical solutions, such as Figure 3 and Figure 5 As shown, the second connecting member 5 includes a fifth link 51 and a sixth link 52 arranged opposite to each other. One end of the fifth link 51 and the sixth link 52 is rotatably connected to the movable member 2, and the other end of the fifth link 51 and the sixth link 52 is rotatably and slidably connected to the fixed member 3.

[0042] Specifically, when the carrier 1 moves from the extended position to the folded position, the carrier 1 moves relative to the movable part 2, and the movable part 2 moves relative to the fixed part 3. During the movement, one end of the fifth link 51 and the sixth link 52 rotates relative to the movable part 2, and the other end of the fifth link 51 and the sixth link 52 rotates relative to the fixed part 3, so that the movable part 2 gradually approaches the fixed part 3 and folds above the fixed part 3.

[0043] Furthermore, such as Figure 5 As shown, the fixing member 3 is provided with a sliding groove 31, and a sliding engagement block 32 is provided in the sliding groove 31. The sliding engagement block 32 can slide relative to the sliding groove 31, and one end of the sliding engagement block 32 is rotatably connected to the other end of the fifth link 51 and the sixth link 52. The sliding groove 31 and the sliding engagement block 32 play a guiding role in the sliding of the fifth link 51 and the sixth link 52 relative to the fixing member 3, which can improve the sliding stability. In the folded position, the fifth link 51 and the sixth link 52 can be folded on both sides of the sliding engagement block 32, which can further reduce the space occupied by the lifting device after folding.

[0044] Preferably, such as Figure 6 As shown, the movable part 2 is provided with a limiting slot 21, and the fifth connecting rod 51 is provided with a limiting protrusion 511. When the bearing 1 moves to the extended position, the limiting protrusion 511 is engaged with the limiting slot 21 to restrict the movable part 2 from continuing to move relative to the fixed part 3.

[0045] Specifically, one of the movable component 2 and the carrier component 1 is provided with a sliding limiting groove, and the other is provided with a limiting engagement part. The limiting engagement part cooperates with the sliding limiting groove so that one end of the carrier component 1 can slide relative to the movable component 2. The limiting engagement part can be a limiting slider or a limiting roller. Specifically, the movable component 2 can have a sliding limiting groove and the carrier component 1 can have a limiting slider, or the movable component 2 can have a limiting slider and the carrier component 1 can have a sliding limiting groove.

[0046] Based on the above technical solutions, such as Figure 7 As shown, the lifting device also includes a drive mechanism, which includes a drive component 6 and a transmission component. The drive component 6 is located at the end of the support component 1 that is away from the movable component 2 when it is in the extended position. One end of the transmission component is connected to the drive component 6, and the other end extends sequentially along the support component 1 and the movable component 2 to the fixed component 3. The drive component 6 rotates to drive the transmission component to move, which can drive the support component 1 to move from the folded position to the extended position and from the extended position to the folded position.

[0047] Specifically, during the process of the drive component 6 rotating and driving the transmission component to move, the transmission component first drives the carrier component 1 to move close to the movable component 2 until the carrier component 1 folds onto the movable component 2. Then, the transmission component drives the carrier component 1 and the movable component 2 to move simultaneously until they fold onto the fixed component 3.

[0048] Furthermore, the transmission component includes a transmission belt and a rotating shaft. There are multiple rotating shafts, described with the support member 1 in the extended position. Multiple rotating shafts are respectively located at both ends of the support member 1, at the end of the movable member 2 near the fixed member 3, and on the fixed member 3. The transmission belt is sequentially arranged on the multiple rotating shafts. The driving member 6 is connected to the rotating shaft at the outer end of the support member 1. A one-way bearing is provided between the driving member 6 and the rotating shaft at the outer end of the support member 1. The one-way bearing ensures that when the driving member 6 rotates, driving the rotating shaft and transmission belt to rotate, if the driving member 6 stops rotating, the rotating shaft can remain in its current position, preventing the rotating shaft from reversing. This prevents the transmission belt from retracting in the opposite direction, ensuring that the support member 1 and the object it carries will not fall due to gravity, thus guaranteeing the stability and safety of the lifting device.

[0049] The driving component 6 can be a rocker arm or a motor. One end of the transmission belt is connected to the rotating shaft at the outer end of the carrier 1, and the other end is arranged along multiple rotating shafts, extending to the fixed component 3 under the guidance of the rotating shafts. When the rocker arm or motor drives the rotating shaft at the outer end of the carrier 1 to rotate, it can drive the transmission belt to move. During the movement of the transmission belt, it will gradually wrap around the rotating shaft at the outer end of the carrier 1, and the length of the transmission belt will gradually decrease, causing the carrier 1 to begin to shrink relative to the movable component 2, and the movable component 2 to begin to shrink relative to the fixed component 3. Finally, the carrier 1 shrinks from the extended position to the folded position. Conversely, when the rocker arm or motor drives the rotating shaft to rotate in the opposite direction, the length of the transmission belt gradually lengthens, causing the carrier 1 to begin to unfold relative to the movable component 2, and the movable component 2 to begin to unfold relative to the fixed component 3. Finally, the carrier 1 unfolds from the folded position to the extended position.

[0050] Based on the above technical solutions, such as Figure 8-10 As shown, the lifting device also includes a transmission mechanism, which includes a transmission rack, a first transmission engagement part 7, and a second transmission engagement part 71. The first transmission engagement part 7 is located on the side of the movable member 2 near the support member 1 and is rotatably connected to the support member 1. The second transmission engagement part 71 is located on the side of the movable member 2 near the fixed member 3 and is rotatably connected to the fixed member 3. Both ends of the movable member 2 are provided with transmission shafts 72. The transmission rack includes a first rack and a second rack. The first rack is sequentially located at one end of the first transmission engagement part 7, one end of the transmission shaft 72 of the movable member 2, and one end of the second transmission engagement part 71. The second rack is sequentially located at the other end of the first transmission engagement part 7, the other end of the transmission shaft 72 of the movable member 2, and the other end of the second transmission engagement part 71.

[0051] Furthermore, both the first transmission engagement part 7 and the second transmission engagement part 71 are provided with rack engagement parts. The first rack and the second rack respectively engage with the rack engagement parts at both ends of the first transmission engagement part 7 and the second transmission engagement part 71, and cooperate with the transmission shaft 72. When the drive mechanism drives the carrier 1 and the movable part 2 to move relative to the fixed part 3, the carrier 1 can drive the movable part 2 to move closer to the fixed part 3 at the same time. Compared with the above situation where the carrier 1 moves closer to the movable part 2 first and then both move closer to the fixed part 3 at the same time, the running time of the lifting device can be saved and the working efficiency of the lifting device can be improved.

[0052] Optionally, such as Figure 11-13 As shown, the carrier 1 is provided with a locking mechanism, and the movable part 2 is provided with a locking engagement part 9. The locking mechanism and the locking engagement part 9 cooperate to fix the carrier 1 to the movable part 2 when the carrier 1 moves to the folded position.

[0053] Specifically, the locking mechanism includes a locking limiting part 91, a locking driving part 92, and a locking elastic part 93. The locking limiting part 91 can be a slot or a groove, and the locking engaging part 9 can be a claw or a protrusion. The engagement form between the locking limiting part 91 and the locking engaging part 9 can be a limiting between a claw and a slot, or a limiting between a protrusion and a groove. The locking driving part 92 is connected to the locking limiting part 91 and can be a pressing protrusion. The shape of the pressing protrusion is not limited. When the user needs to pull the carrier 1 from the folded position to the extended position, the user can press the pressing protrusion to make the claw disengage from the slot, so that the carrier 1 can move relative to the movable part 2. The locking elastic part 93 abuts against the claw, and the elastic force makes the claw and the pressing protrusion return to their original positions.

[0054] Based on the above technical solutions, such as Figure 1 As shown, there are two of each of the supporting member 1, the movable member 2, and the fixed member 3. A first connecting rod 8 is provided between the two supporting members 1, and a second connecting rod 81 is provided between the two movable members 2.

[0055] The dual load-bearing components 1 and dual movable components 2 are symmetrically distributed, which makes the load of the heavy object evenly distributed, avoids the problem of uneven load caused by unilateral force, and improves the stability of the lifting process.

[0056] With two of each of the following components: the carrier 1, the movable 2, and the fixed 3, the carrier 1 includes a first carrier and a second carrier. The driving component 6 is located at the end of the first carrier away from the movable 2 when it is in the extended position. The driving component 6 is connected to the rotating shaft at the outer end of the first carrier 1. The end of the second carrier away from the movable 2 when it is in the extended position is provided with a torsion spring. The torsion spring is sleeved on the rotating shaft at the outer end of the second carrier. When the driving component 6 rotates, it drives the rotating shafts at the outer ends of the first and second carriers to rotate simultaneously. If the driving component 6 stops rotating in the middle, the first carrier is limited by a one-way bearing on one side, while the second carrier is limited by the torsion spring on one side. The torsion spring ensures that the rotating shaft at the outer end of the second carrier can stay in the current position, preventing the rotating shaft from reversing and thus preventing the transmission belt from contracting in the opposite direction. The torsion spring and the one-way bearing cooperate to prevent the carrier 1 and the object it carries from falling due to gravity, ensuring the stability and safety of the lifting device.

[0057] Furthermore, both the first connecting rod 8 and the second connecting rod 81 are telescopic rods to adjust the distance between the two load-bearing members 1 and between the two movable members 2.

[0058] The first connecting rod 8 and the second connecting rod 81 are telescopic rods. The telescopic adjustment function can adapt to items of different sizes, ensuring that the center of gravity is always located in the center of the structure and preventing tilting or swaying. The telescopic adjustment can be achieved by manual locking, spring buckle, or electric drive to meet the needs of different users.

[0059] It is understandable that the first connecting rod 8 and the second connecting rod 81 can be telescopic rods or fixed rods of a fixed length, which can be selected according to the user's actual needs.

[0060] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A lifting device, characterized in that It includes a support member, a movable member, and a fixing member. One end of the support member is movably connected to a first side of the movable member. A first connecting member is provided between the support member and the movable member. One end of the fixing member is movably connected to a second side of the movable member. A second connecting member is provided between the fixing member and the movable member. The support member is capable of moving relative to the fixing member between a folded position above the fixing member and an extended position below the fixing member.

2. The lift device of claim 1, wherein, The first connecting member includes a first link, a second link, a third link, and a fourth link. One end of the first link is rotatably connected to the bearing member. The other end of the first link is rotatably connected to one end of the second link. The other end of the second link is rotatably connected to one end of the third link. The other end of the third link is rotatably connected to one end of the fourth link. Both ends of the third link are slidably connected to the movable member. The other end of the fourth link is rotatably connected to the middle of the first link.

3. The lift device of claim 2, wherein, There are two third links and two fourth links. The two third links are arranged opposite each other on both sides of the second link, and the two fourth links are arranged opposite each other on both sides of the first link. When the carrier moves from the folded position to the extended position, it drives the first link to rotate, which in turn drives the second link and the two fourth links to rotate simultaneously. This causes the third link to slide relative to the movable part, so that the carrier moves to the extended position.

4. The lift device of claim 1, wherein, The second connecting member includes a fifth link and a sixth link arranged opposite to each other. One end of the fifth link and the sixth link is rotatably connected to a movable member, and the other end of the fifth link and the sixth link is rotatably and slidably connected to a fixed member.

5. The lift device of claim 4, wherein, The fixing member is provided with a sliding groove, and a sliding engagement block is provided in the sliding groove. The sliding engagement block can slide relative to the sliding groove, and one end of the sliding engagement block is rotatably connected to the other end of the fifth link and the sixth link.

6. The lift device of claim 4, wherein, The movable component is provided with a limiting slot, and the fifth connecting rod is provided with a limiting protrusion. When the bearing component moves to the extended position, the limiting protrusion engages with the limiting slot to restrict the movable component from continuing to move relative to the fixed component.

7. The lifting device according to any one of claims 1 to 6, characterized in that It also includes a drive mechanism, which includes a drive component and a transmission component. The drive component is located at the end of the carrier component away from the movable component when it is in the extended position. One end of the transmission component is connected to the drive component, and the other end extends sequentially along the carrier component and the movable component to the fixed component. The rotation of the drive component drives the transmission component to move, which can drive the carrier component to move from the folded position to the extended position and from the extended position to the folded position.

8. The lift device according to any one of claims 1 to 6, characterized in that It also includes a transmission mechanism, which includes a transmission rack, a first transmission engagement part, and a second transmission engagement part. The first transmission engagement part is located on the side of the movable part near the support member and is rotatably connected to the support member. The second transmission engagement part is located on the side of the movable part near the fixed member and is rotatably connected to the fixed member. Both ends of the movable part are provided with transmission shafts. The transmission rack includes a first rack and a second rack. The first rack is sequentially located at one end of the first transmission engagement part, the transmission shaft at one end of the movable part, and one end of the second transmission engagement part. The second rack is sequentially located at the other end of the first transmission engagement part, the transmission shaft at the other end of the movable part, and the other end of the second transmission engagement part.

9. The lift device according to any one of claims 1 to 6, characterized in that, The number of the bearing component, the movable component, and the fixed component are all two. A first connecting rod is provided between the two bearing components, and a second connecting rod is provided between the two movable components.

10. The lifting device according to claim 9, characterized in that, Both the first connecting rod and the second connecting rod are telescopic rods to adjust the distance between the two load-bearing components and between the two moving components.

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