Bed lifting device and bed

Abstract

The utility model relates to the technical field of medical equipment, and provides a hospital bed lifting device and a hospital bed. The hospital bed lifting device is connected to a base, and includes: a height adjustment unit, a driving assembly and an anti-falling unit; the driving assembly includes a bearing unit, a transmission unit and a driving unit; the driving unit is fixedly arranged on the base; the bearing unit is arranged on the driving unit, the transmission unit is arranged on the height adjustment unit, and the transmission unit is in sliding contact with the bearing unit; the anti-falling unit is connected to the transmission unit and / or the bearing unit. The hospital bed lifting device has a strong bearing capacity by improving the driving structure, and by adding an anti-falling unit, the lifting device also has an anti-falling function.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a hospital bed lifting device and a hospital bed. Background Art

[0002] In scanning devices such as Magnetic Resonance Imaging (MRI) and Computed Tomography (CT), the hospital bed is usually equipped with a lifting function, through which the target object is lifted from the initial position to the scanning height.

[0003] The drive device is arranged inside the lifting device to provide driving force for the lifting device. Different structures and arrangements of the drive devices have different effects on the overall movement process and force of the lifting device.

[0004] In the existing lifting devices, the driving device is usually fixedly arranged on the bottom plate, and is used to drive the lifting unit to perform lifting and lowering movements. In this type of driving device, the lifting unit is lifted and lowered by applying a force to the lifting unit. When the driving device unloads the force applied to the lifting unit, the lifting unit will be lowered by the self-weight of the bed. During this descending process, the lifting unit is always in contact with the driving end of the driving device, so the driving end of the driving device essentially acts as a support member to allow the lifting unit to descend slowly. However, when the lifting unit is stuck, it may cause the driving end of the driving device to unload the force, and the lifting unit will not slowly descend with the driving end. At this time, the lifting unit is separated from the driving end, that is, the lifting unit has no external support. Once an external force is applied to the bed, causing the force balance of the lifting unit to be destroyed, the lifting unit will suddenly fall.

[0005] In order to solve the above problems, the utility model provides a hospital bed lifting device and a hospital bed, which have an anti-falling function. Utility Model Content

[0006] The utility model aims to provide a hospital bed lifting device and a hospital bed. The hospital bed lifting device is provided with an anti-falling unit, so that the lifting device also has an anti-falling function.

[0007] The utility model provides a hospital bed lifting device, which is connected to a base and comprises: a height adjustment unit, a driving assembly and an anti-falling unit;

[0008] The driving assembly includes a bearing unit, a transmission unit and a driving unit;

[0009] The driving unit is fixedly arranged on the base;

[0010] The bearing unit is arranged on the driving unit, the transmission unit is arranged on the height adjustment unit, and the transmission unit is in sliding contact with the bearing unit;

[0011] The anti-fall unit is connected to the transmission unit and / or the carrying unit.

[0012] Optionally, the anti-falling unit is connected to the carrying unit, a sliding groove is provided on the anti-falling unit, and a part of the transmission unit extends into the sliding groove and slidably cooperates with the sliding groove.

[0013] Optionally, the transmission unit includes a rolling element and a rolling shaft, the rolling element is rotatably mounted on the height adjustment unit via the rolling shaft, and one end of the rolling shaft extends into the sliding groove and slidably cooperates with the sliding groove.

[0014] Optionally, the anti-fall unit includes a follower, a sliding groove is provided on the carrying unit, one end of the follower is connected to the transmission unit, and the other end of the follower is located in the sliding groove and slidably cooperates with the sliding groove.

[0015] Optionally, the transmission unit includes a rolling element and a rolling shaft, the rolling element is rotatably installed on the height adjustment unit via the rolling shaft, one end of the follower is connected to the rolling shaft, and the other end of the follower is located in the sliding groove and slidably cooperates with the sliding groove.

[0016] Optionally, the bearing unit has a curved surface, and the transmission unit is in contact with the curved surface.

[0017] Optionally, the driving unit includes a fixed part and a moving part connected to the fixed part; the fixed part is fixedly disposed on the base, and the carrying unit is disposed on the moving part.

[0018] Optionally, the carrying unit is disposed on the base and slidably cooperates with the base.

[0019] Optionally, the positions of the carrying unit and the transmission unit are interchangeable.

[0020] The utility model also provides a hospital bed, comprising the above-mentioned hospital bed lifting device, a base and a bed board, wherein the first end of the height adjustment unit is rotatably connected to the base, and the second end of the height adjustment unit is rotatably connected to the bed board.

[0021] In summary, the utility model provides a bed lifting device, which is connected to a base and includes: a height adjustment unit, a drive assembly and an anti-fall unit; the drive assembly includes a load-bearing unit, a transmission unit and a drive unit; the drive unit is fixedly arranged on the base; the load-bearing unit is arranged on the drive unit, the transmission unit is arranged on the height adjustment unit, and the transmission unit is in sliding contact with the load-bearing unit; the anti-fall unit is arranged between the transmission unit and the load-bearing unit.

[0022] With such configuration, in the utility model, the driving assembly realizes the lifting and lowering drive of the lifting device through the curved surface cooperating with the transmission unit, and the direction of the force provided by the curved surface to the transmission unit is the normal direction at the tangent point of the two. The direction of the force on the transmission unit can be adjusted by adjusting the appropriate curved surface shape, for example, so that the direction of the force on the transmission unit is always perpendicular to the height adjustment unit, so that even in the lowest position, the lifting of the lifting device can be achieved with a small thrust. By setting the curved surface, it can be ensured that the moving part can realize the lifting and lowering drive at a low position or under a large load-bearing condition under the premise of a small linear thrust, so as to improve the load-bearing capacity of the bed and help to lift a target object with a large weight from a lower initial position to a specified position.

[0023] In the present utility model, the transmission unit and the load-bearing unit are connected by the anti-fall unit. When the load-bearing unit is driven to move in the direction away from the height adjustment unit, if the height adjustment unit is stuck due to external factors, the transmission unit will pull the load-bearing unit in the reverse direction, so that the transmission unit, the load-bearing unit and the anti-fall unit form a self-locking state. At this time, the movement of the load-bearing unit is restricted, and the transmission unit always keeps in contact with the curved surface. That is, the transmission unit is always supported on the curved surface, so that the height adjustment unit is supported to ensure the stability of the entire lifting device, and the transmission unit can be effectively prevented from falling due to suspension. In addition, since the movement of the load-bearing unit to the right is restricted, the driving force of the drive assembly will increase significantly. When it is greater than a certain threshold, the controller can send an abnormal signal alarm or shut down to avoid accidents, which also improves the safety of the entire lifting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The three-dimensional structure of the hospital bed in some embodiments of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 2 It is a schematic side view of the structure of a hospital bed in some embodiments of the utility model;

[0026] Figure 3 The three-dimensional structure of the hospital bed in some embodiments of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 4The partial structure of the hospital bed in some embodiments of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 5 The partial structure of the hospital bed in some embodiments of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 6 It is a partial structural schematic diagram of a hospital bed in some other embodiments of the utility model;

[0030] Figure 7 It is a structural schematic diagram of a hospital bed in some other embodiments of the utility model;

[0031] Figure 8 It is a schematic diagram of the partial structure of the hospital bed of other embodiments of the utility model.

[0032] The reference numerals are as follows:

[0033] 100- Bed lifting device;

[0034] 10-base; 11-track;

[0035] 20-height adjustment unit; 21-first height adjustment arm; 22-second height adjustment arm;

[0036] 30-drive assembly;

[0037] 31-carrying unit; 311-curved surface; 312-track groove;

[0038] 32-transmission unit; 321-rolling element; 322-roller;

[0039] 33-driving unit; 331-fixed part; 332-moving part; 3321-screw rod; 3322-driving arm; 333-reducer;

[0040] 31'-slope unit; 311'-slope;

[0041] 40-anti-fall unit; 41-sliding slot; 42-accompanying piece;

[0042] 200-bed board. DETAILED DESCRIPTION

[0043] The following is a further detailed description of the hospital bed lifting device proposed by the utility model in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the utility model will be more clear. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model.

[0044] As used in the present invention, the singular forms "one", "an", and "the" include plural objects, the term "or" is usually used to include the meaning of "and / or", the term "several" is usually used to include the meaning of "at least one", and the terms "at least two" or "a plurality" are usually used to include the meaning of "two or more". In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features. In addition, as used in the present invention, "installed", "connected", "connected", and one element "set" on another element should be understood in a broad sense, usually only indicating that there is a connection, coupling, cooperation or transmission relationship between the two elements, and the connection, coupling, cooperation or transmission between the two elements can be direct or indirect through an intermediate element, and cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, one element can be in any orientation such as inside, outside, above, below or one side of another element, unless the content clearly indicates otherwise. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, directional terms such as above, below, up, down, upward, downward, left, right, etc. are used relative to the exemplary embodiments as shown in the figures, with the upward or upper direction toward the top of the corresponding figure, and the downward or lower direction toward the bottom of the corresponding figure.

[0045] In equipment such as MRI and CT, the hospital beds are usually equipped with a lifting function, through which the target object is lifted from the initial position to the scanning height.

[0046] The drive device is arranged inside the lifting device to provide driving force for the lifting device. Different structures and arrangements of the drive devices have different effects on the overall movement process and force of the lifting device.

[0047] In the existing lifting device, its driving device is usually fixedly arranged on the bottom plate, and is used to drive the lifting unit to perform lifting movement. In this type of driving device, the lifting unit is lifted and lowered by applying a force to the lifting unit. When the driving device unloads the force applied to the lifting unit, the lifting unit will be lowered by the self-weight of the bed. During this descent process, the lifting unit is always in contact with the driving end of the driving device, so the driving end of the driving device essentially acts as a support member to allow the lifting unit to slowly descend. However, when the lifting unit is stuck, it may cause the driving end of the driving device to move away from the lifting unit to unload the force, and the lifting unit will not swing slowly with the driving end. At this time, the lifting unit is separated from the driving end, that is, the lifting unit has no external support. At this time, once the bed is applied with an external force, causing the force balance of the lifting unit to be destroyed, the lifting unit will suddenly swing, causing the bed to suddenly fall.

[0048] In order to improve the above technical problems, in this embodiment, a hospital bed is provided;

[0049] The hospital bed comprises a base 10, a hospital bed lifting device 100 and a bed board 200. The bed board 200 is installed on the hospital bed lifting device 100. The hospital bed lifting device 100 is installed on the base 10. The lifting device 100 is used to adjust the height of the bed board.

[0050] Please refer to Figures 1 to 3 As shown, in some embodiments, the bed board 200 is rectangular, and the upper surface of the bed board 200 is used to carry the target object.

[0051] In some other alternative embodiments, the shape of the bed board 200 can be adaptively adjusted based on actual usage requirements.

[0052] The hospital bed lifting device 100 includes: a height adjustment unit 20, a driving assembly 30 and an anti-falling unit 40;

[0053] like Figure 1 and Figure 2 As shown, in this embodiment, the height adjustment unit 20 includes a first height adjustment arm 21 and a second height adjustment arm 22 .

[0054] The first end ( Figure 1 The lower end of the first height adjustment arm 21) is rotatably connected to the base 10; the second end of the first height adjustment arm 21 ( Figure 1 The upper end of the first height adjustment arm 21 is rotatably connected to the bed board 200. When the first height adjustment arm 21 swings, it will drive the bed board 200 to do lifting movement.

[0055] like Figures 1 to 3As shown, the hospital bed lifting device also includes a second height adjustment arm 22. The first height adjustment arm 21 and the second height adjustment arm 22 have the same length and are arranged in a cross-shaped scissor-like manner. The two are rotatably connected at their intersection. Specifically, the middle positions of the first height adjustment arm 21 and the second height adjustment arm 22 are rotatably matched, and the two can be opened or closed in a scissor-like manner when they rotate relative to each other. The first end ( Figure 1 The lower end of the first height adjustment arm 21) is rotatably matched with the base 10, and the first end of the second height adjustment arm 22 ( Figure 1 The lower end of the second height adjustment arm 22 is linearly slidably matched with the base 10.

[0056] The second end ( Figure 1 The upper end of the first height adjustment arm 21) and the second end of the second height adjustment arm 22 ( Figure 1 The upper end of the second height adjustment arm 22 is rotatably connected to the bottom of the bed board 200.

[0057] The rotation center axis of the rotation connection between the first height adjustment arm 21 and the second height adjustment arm 22, the rotation center axis of the rotation connection between the first height adjustment arm 21 and the base 10, and the rotation center axis of the rotation connection between the first height adjustment arm 21, the second height adjustment arm 22 and the bed board 200 are all parallel and extend along the width direction of the bed board 200. The linear sliding direction of the second end of the second height adjustment arm 22 is consistent with the length direction of the bed board 200.

[0058] In the above embodiment, the first end of the first height adjustment arm 21 and the first end of the second height adjustment arm 22 serve as one end of the height adjustment unit 20, and the second end of the first height adjustment arm 21 and the second end of the second height adjustment arm 22 serve as two ends of the height adjustment unit 20. The first height adjustment arm 21 and the second height adjustment arm 22 form a scissor-fork type lifting structure.

[0059] In some other alternative embodiments, the height adjustment unit 20 may also be a scissor-fork type lifting structure composed of two crossed plate structures.

[0060] In some other alternative embodiments, the height adjustment unit 20 may also be a parallelogram lifting structure (i.e., the first height adjustment arm 21 and the second height adjustment arm 22 are arranged in parallel), or the height adjustment unit 20 may also be a multi-stage scissor fork or vertical lifting rod type lifting structure. The specific form of the height adjustment unit 20 can be adaptively adjusted based on actual use requirements.

[0061] The driving assembly 30 is used to drive the first height adjustment arm 21 to swing, which is then converted into a lifting movement of the bed board 200 .

[0062] The driving assembly 30 includes a carrying unit 31 , a transmission unit 32 and a driving unit 33 .

[0063] The driving unit 33 includes a fixed portion 331 and a movable portion 332. The movable portion 332 can move relative to the fixed portion 331. The fixed portion 331 is fixedly disposed on the base 10. The movable portion 332 is used as a driving end of the driving unit 33 to provide power for the rotation of the first height adjustment arm 21.

[0064] Please refer to Figures 1 to 3 As shown, in this embodiment, the driving unit 33 also includes a reducer 333, the fixed part 331 is a rotating motor, and the moving part 332 is a screw nut pair, which includes a screw 3321 and a driving arm 3322, wherein the screw 3321 is matched with the power output end of the reducer 333 in transmission, the screw 3321 is matched with the driving arm 3322 in threaded transmission, and the screw 3321 and the driving arm 3322 constitute a screw nut pair. When the screw 3321 rotates, it will drive the driving arm 3322 to do linear motion. The rotating motor transmits power to the screw through the reducer 333, and the screw converts the rotational motion into the linear motion of the driving arm 3322. The driving arm 3322 is connected to the bearing unit 31 as a driving end, so that the bearing unit 31 is driven to do linear motion. The reducer 333 can adjust the output speed, torque and direction of the fixed part 331, and also has a self-locking function.

[0065] Please continue to refer to Figures 1 to 3 As shown, in this embodiment, the fixed portion 331 is fixedly installed on the base 10, the movable portion 332 is arranged parallel to the base 10, the base 10 is arranged horizontally, and the driving arm 3322 moves relative to the fixed portion 331 in a direction parallel to the base 10.

[0066] Furthermore, the fixing portion 331 is arranged on one side of the first height adjustment arm 21 along the length direction of the bed board 200. So that along the vertical direction of the base 10, the projection of the fixing portion 331 does not overlap with the projection of the first height adjustment arm 21. Therefore, during the swinging process of the first height adjustment arm 21, the fixing portion 331 is not located below the first height adjustment arm 21; similarly, since the second height adjustment arm 22 and the first height adjustment arm 21 are in a scissor-fork structure, the horizontal movement amplitude of the second height adjustment arm 22 is consistent with that of the first height adjustment arm 21 during the swinging process, and the fixing portion 331 will not be located below the second height adjustment arm 22. Through this structure, the driving components located below the height adjustment unit can be reduced, thereby improving the interference phenomenon between the driving components and the bed board or the height adjustment unit, helping to increase the descending amplitude of the lifting device, thereby increasing the lifting stroke of the bed, so that the bed can be adapted to medical imaging equipment with various lifting requirements. It can also reduce the safety risk during maintenance. During the lifting process, the fixing portion 331, as a power source, does not move with the bed, which effectively improves the safety and reliability of the bed system.

[0067] In some other alternative embodiments, the driving unit 33 may be a linear motor, a hydraulic push rod, or other linear power elements. When the driving unit 33 is a linear motor, its motor housing and stator serve as the fixed portion 331, and its output end serves as the moving portion 332; when the driving unit 33 is a hydraulic push rod, its hydraulic housing serves as the fixed portion 331, and its push rod serves as the moving portion 332.

[0068] Furthermore, the bearing unit 31 has a curved surface 311 . The bearing unit 31 is disposed on the moving portion 332 and is used to be driven by the moving portion 332 to perform linear motion. The transmission unit 32 is disposed on the first height adjustment arm 21 .

[0069] Please refer to Figures 3 to 5 As shown, in this embodiment, the transmission unit 32 includes a rolling element 321 and a rolling shaft 322. The rolling element 321 is rotatably mounted on the first height adjustment arm 21 through the rolling shaft 322, and the rolling shaft 322 is fixed on the first height adjustment arm 21. The rolling element 321 is composed of a roller sleeve after the bearing surface is hardened.

[0070] In some other alternative embodiments, the transmission unit 32 may be designed to include a ball structure, a cylindrical roller structure, or a smooth convex structure formed by machining.

[0071] Please continue to refer to Figures 3 to 5As shown, the whole load-bearing unit 31 is a block structure approximately in the shape of a right triangle, and a right angle side of the load-bearing unit 31 is used as its bottom to slide with the base 10. Part of the inclined surface of the load-bearing unit 31 is removed to form a concave curved surface 311. The transmission unit 32 is supported on the curved surface 311 and can roll or slide along the curved surface 311. When the moving part 332 drives the load-bearing unit 31 to move in a certain direction, the load-bearing unit 31 moves in a certain direction. Figure 3 When the first height adjustment arm 21 moves to the left, the bearing unit 31 is driven to move linearly, thereby causing the transmission unit 32 to roll obliquely upward along the curved surface 311. During the rolling process of the transmission unit 32 along the curved surface 311, its horizontal position and height direction change, so it can drive the first height adjustment arm 21 to swing. When the first height adjustment arm 21 swings, it will drive the bed plate 200 to move up and down, and the second height adjustment arm 22 will also swing adaptively around the central axis of the rotational connection with the first height adjustment arm 21. The second end ( Figure 3 The lower end of the second height adjustment arm 22 will make a linear motion on the base 10 along the length direction of the bed board 200 to realize the opening and closing movement of the scissors fork.

[0072] If the transmission unit 32 is arranged on the second height adjustment arm 22, the second height adjustment arm 22 will not only swing relative to the base 10, but also make linear motion relative to the base 10 along the length direction of the bed board 200. At this time, if the bearing unit 31 drives the transmission unit 32, the movement distance of the bearing unit 31 needs to compensate for the linear motion stroke of the second height adjustment arm 22, resulting in a longer horizontal linear driving stroke of the bearing unit 31. At this time, the overall size of the entire drive assembly 30 is longer. Therefore, in this embodiment, the transmission unit 32 is arranged on the first height adjustment arm 21. The first height adjustment arm 21 only makes a rotational motion relative to the base 10. Therefore, the bearing unit 31 only needs to move a smaller stroke along the length direction of the bed board 200 to drive the first height adjustment arm 21 to swing, thereby achieving a larger lifting stroke.

[0073] To ensure the movement stability of the second height adjustment arm 22 , a slide rail and a slider may be provided on the base 10 . The slider moves linearly along the slide rail, and the lower end of the second height adjustment arm 22 rotates with the slider to constrain the lower end of the second height adjustment arm 22 .

[0074] Please combine Figure 1 and Figure 4 As shown, in order to ensure the movement stability of the bearing unit 31, in this embodiment, the bearing unit 31 is arranged on the base 10 and slides linearly with the base 10. The base 10 is provided with a track 11 along the length of the bed board 200, and a track groove 312 is opened at the bottom of the bearing unit 31 (the structure of the track groove 312 is detailed in Figure 4 and Figure 5As shown), the track 31 and the track groove 312 are conformally matched so that the carrying unit 31 and the base 10 form a single-degree-of-freedom linear sliding fit.

[0075] The concave surface of the curved surface 311 is arranged to cooperate with the transmission unit 32, and the direction of the force provided by the concave surface to the transmission unit 32 is the normal direction at the tangent point of the two. The direction of the force on the transmission unit 32 can be adjusted by adjusting the appropriate concave shape, for example, so that the direction of the force on the transmission unit 32 is always perpendicular to the first height adjustment arm 21, so that even in the lowest position, the lifting device can be lifted with a small thrust. Through the setting of the curved surface 311, it can be ensured that the moving part 332 can achieve lifting and lowering drive at a low position or under a large load-bearing condition under the premise of a small linear thrust, so as to improve the load-bearing capacity of the bed, which helps to lift a target object with a large weight from a lower initial position to a specified position.

[0076] In some other alternative embodiments, the carrying unit 31 may not cooperate with the track, and the carrying unit 31 is directly and horizontally attached to the base 10, and the carrying unit 31 is guided by the base 10.

[0077] The transmission unit 32 will roll along the curved surface 311, and the outer peripheral surface of the transmission unit 32 is set to reduce the friction with the curved surface 311. The outer peripheral surface of the transmission unit 32 is in line contact with the curved surface 311 rather than point contact. While reducing the friction, a larger contact area between the transmission unit 32 and the curved surface 311 is ensured to ensure the stability of the coordinated movement of the two, and at the same time, it is also beneficial to improve the local stress concentration phenomenon when the two interact with each other, so as to prevent the contact position of the two from being damaged due to excessive local stress.

[0078] In this embodiment, the first height adjustment arm 21 and the second height adjustment arm 22 form a scissor-type structure. In order to ensure the stability of the hospital bed, the stability of the bed board 200 can be improved by widening the width of the first height adjustment arm 21 and the second height adjustment arm 22. For example, the width of the first height adjustment arm 21 and the second height adjustment arm 22 is roughly consistent with the width of the bed board 200 to provide stable support for the bed board 200 in the width direction. Of course, two scissor-type structures can also be set and arranged along the width direction of the bed board 200. In this case, each scissor-type structure can be equipped with a drive assembly, or only one drive assembly is set to drive one of the scissor-type structures to move.

[0079] In some other alternative embodiments, the bearing unit 31 can be arranged on the height adjustment unit 20, and the transmission unit 32 can be arranged on the moving part 332, that is, the bearing unit 31 and the transmission unit 32 can be installed at interchangeable positions. In this case, the moving part 332 drives the transmission unit 32 to move linearly, and the transmission unit 32 fits on the curved surface 311 of the bearing unit 31, and the transmission unit 32 drives the bearing unit 31 and the height adjustment unit 20 to move.

[0080] In this embodiment, the first height adjustment arm 21 and the second height adjustment arm 22 constitute a scissor-fork lifting structure. In some other alternative embodiments, the first height adjustment arm 21 and the second height adjustment arm 22 can be arranged in parallel, and the first height adjustment arm 21, the second height adjustment arm 22, the base 10 and the bed board 200 form a parallelogram structure. At this time, the drive assembly 30 only needs to drive the first height adjustment arm 21 to rotate, and its driving method is similar to the scissor-fork lifting structure, which will not be repeated here.

[0081] Furthermore, the anti-fall unit 40 is connected to the transmission unit 32 and / or the bearing unit 31 to prevent the transmission unit 32 from being separated from the curved surface 311 , that is, to ensure that the transmission unit 32 is always in contact with the curved surface 311 .

[0082] Please continue to refer to Figures 3 to 5 As shown, the anti-falling unit 40 is connected to the carrying unit 31. The anti-falling unit 40 is a plate-type structure, which is fixedly connected to one side of the carrying unit 31.

[0083] The roller 322 of the transmission unit 32 is slidably matched with the anti-falling unit 40 , and the sliding direction of the roller 322 relative to the anti-falling unit 40 is consistent with the movement path of the roller 322 when the transmission unit 32 rolls along the curved surface 311 .

[0084] Please continue to refer to Figures 3 to 5 As shown, an arc-shaped sliding groove 41 is provided on one side of the anti-fall unit 40, and the shape of the sliding groove 41 is consistent with the direction of the curved surface 311. One end of the roller 322 extends into the sliding groove 41 and movably cooperates with the sliding groove 341. When the transmission unit 32 rolls along the curved surface 311, the roller 322 slides in the sliding groove 41 adaptively.

[0085] Please refer to Figure 3 and Figure 4 As shown, when the drive arm 3322 is driven by the lead screw along Figure 3 When moving to the left, the carrying unit 31 is driven by the driving arm 3322 along Figure 3When the height adjustment unit 20 moves to the left, the transmission unit 32 rolls upward along the curved surface 311, so that the height adjustment unit 20 swings and the bed plate 200 rises. In this driving process, the transmission unit 32 is supported on the curved surface 311, so that the height adjustment unit 20 is supported to ensure the stability of the entire lifting device.

[0086] When the driving arm 3322 is driven by the lead screw along Figure 3 When moving to the right, the carrying unit 31 is driven by the driving arm 3322 to move along Figure 3 The height adjustment unit 20 is pressed to the right and is subjected to the gravity or load of the bed board 200 itself, so that the height adjustment unit 20 is pressed to self-adaptively swing, causing the transmission unit 32 to roll down along the curved surface 311, and the bed board 200 is lowered. During this driving process, once the first height adjustment arm 21 or the second height adjustment arm 22 is stuck due to external factors, the scissor fork structure formed by the first height adjustment arm 21 and the second height adjustment arm 22 will form a locking structure at a certain moment, that is, the first height adjustment arm 21 and the second height adjustment arm 22 remain stationary.

[0087] In order to further explain the technical effect after the anti-fall unit 40 is installed, it is first necessary to explain the movement state of the hospital bed when the anti-fall unit 40 is not installed. Figure 3 In the embodiment, if the transmission unit 32 and the bearing unit 31 are not connected through the anti-fall unit 40, when the bearing unit 31 continues to be driven to move to the right, the transmission unit 32 remains stationary, and the transmission unit 32 is separated from the curved surface 311 to form a suspended state, so the height adjustment unit 20 is not supported at this time. When the target object lies on the bed board 200 or the balance of the first height adjustment arm 21 and the second height adjustment arm 22 is broken due to other external factors, the first height adjustment arm 21 and the second height adjustment arm 22 will swing adaptively, causing the bed board 200 to fall rapidly, and the transmission unit 32 hits the curved surface 311 or the base 10 heavily.

[0088] Therefore, in the present invention, the transmission unit 32 and the bearing unit 31 are connected by the anti-falling unit 40, such as Figure 3As shown, when the load-bearing unit 31 continues to be driven to move to the right, if the first height adjustment arm 21 or the second height adjustment arm 22 is stuck due to external factors, the transmission unit 32 will pull the load-bearing unit 31 in the reverse direction through the anti-fall unit 40, so that the transmission unit 32, the load-bearing unit 31 and the anti-fall unit 40 form a self-locking state, and the movement of the load-bearing unit 31 to the right is limited. The transmission unit 32 always keeps in contact with the curved surface 311. That is, the transmission unit 32 is always supported on the curved surface 311, so that the height adjustment unit 20 is supported to ensure the stability of the entire lifting device. In addition, since the movement of the load-bearing unit 31 to the right is limited, the driving force of the drive assembly 30 will increase significantly. When it is greater than a certain threshold, the controller can send an abnormal signal alarm or shut down to avoid accidents, which also improves the safety of the entire lifting device.

[0089] In some implementations, such as Figure 6 As shown, the carrying unit 31 can be replaced by the inclined unit 31', and the anti-falling unit 40 is set as a box-shaped structure. The anti-falling unit 40 is fixed on the inclined unit 31' and covers the transmission unit 32 to ensure that the transmission unit 32 is always in contact with the curved inclined surface 311'. The side of the anti-falling unit 40 can be opened to allow the roller to pass through.

[0090] In some implementations, such as Figure 7 and Figure 8 As shown, the anti-fall unit 40 includes a follower 42, a sliding groove 41 is provided on the carrying unit 31, one end of the follower 42 is connected to the rolling shaft 322 of the transmission unit 32, and the side of the other end of the follower 42 has a boss, which is located in the sliding groove 41 and slidably cooperates with the sliding groove 41.

[0091] The shape of the sliding groove 41 is opened based on the running track of the accompanying member 42. The boss of the accompanying member 42 runs in this groove, and a suitable gap is set between the boss and the side wall of the sliding groove 41. When the load-bearing unit 31 and the transmission unit 32 have a tendency to separate, the boss of the accompanying member 42 moves in the sliding groove 41, and the gap between the boss and the sliding groove 41 will be offset, and the two are in contact, and the load-bearing unit 31 is linked with the transmission unit 32 through the accompanying member 42. At this time, the load-bearing unit 31 drags the transmission unit 32 through the accompanying member 42 so that the first height adjustment arm 21 continues to move; or when the first height adjustment arm 21 is stuck, the first height adjustment arm 21 reversely pulls the load-bearing unit 31 through the transmission unit 32 and the accompanying member 42, and the movement of the load-bearing unit 31 is restricted, and the drive unit 33 stops due to overcurrent to ensure that the bed does not fall.

[0092] In some other alternative embodiments, the anti-falling unit 40 may be an elastic member, a multi-link structure, a magnetic member or the like, and the anti-falling unit 40 may be connected to both the transmission unit 32 and the bearing unit 31 .

[0093] It should be noted that the above-mentioned embodiments provide several implementation methods of the bed lifting device, and the technical features in each embodiment are not strictly independent. The technical features in each embodiment can also be used interchangeably with each other. For example, the anti-fall unit 40 with a box-like structure can also be applied to the carrying unit 31.

[0094] In summary, the utility model provides a bed lifting device for adjusting the height of the bed, comprising: a height adjustment unit 20, a drive assembly 30 and an anti-fall unit 40; the first end of the height adjustment unit 20 is rotatably connected to the base 10; the drive assembly 30 comprises a bearing unit 31, a transmission unit 32 and a driving unit 33; the driving unit 33 comprises a fixed portion 331 and a movable portion 332, the movable portion 332 can move relative to the fixed portion 331, and the fixed portion 331 is fixedly arranged on the base 10; the bearing unit 31 1 has a curved surface 311, one of the bearing unit 31 and the transmission unit 32 is arranged on the moving part 332 for being driven by the moving part 332 to make linear motion, and the other is arranged on the height adjustment unit 20, the transmission unit 32 and the curved surface 311 are rollingly matched to convert the linear motion into the rotational motion of the height adjustment unit 20 via the curved surface 311; the anti-falling unit 40 is connected between the transmission unit 32 and the bearing unit 31, and is used to prevent the transmission unit 32 from separating from the curved surface 311.

[0095] With such configuration, in the utility model, the driving assembly 30 realizes the lifting and lowering drive of the lifting device through the curved surface 311 cooperating with the transmission unit 32, and the direction of the force provided by the curved surface 311 to the transmission unit 32 is the normal direction at the tangent point of the two. The direction of the force on the transmission unit 32 can be adjusted by adjusting the appropriate shape of the curved surface 311, for example, so that the direction of the force on the transmission unit 32 is always perpendicular to the height adjustment unit 20, so that even in the lowest position, the lifting of the lifting device can be achieved with a small thrust. By setting the curved surface 311, it can be ensured that the moving part 332 can realize the lifting and lowering drive at a low position or under a large load-bearing condition under the premise of a small linear thrust, so as to improve the load-bearing capacity of the bed and help to lift a target object with a large weight from a lower initial position to a specified position.

[0096] In the present utility model, the transmission unit 32 and the bearing unit 31 are connected by the anti-fall unit 40. When the bearing unit 31 is driven to move in the direction away from the height adjustment unit, if the height adjustment unit 20 is stuck due to external factors, the transmission unit 32 will pull the bearing unit 31 in the reverse direction, so that the transmission unit 32, the bearing unit 31 and the anti-fall unit 40 form a self-locking state. At this time, the movement of the bearing unit 31 is restricted, and the transmission unit 32 always keeps in contact with the curved surface 311. That is, the transmission unit 32 is always supported on the curved surface 311, so that the height adjustment unit 20 is supported to ensure the stability of the entire lifting device, and the transmission unit 32 can be effectively prevented from falling due to suspension. In addition, since the rightward movement of the bearing unit 31 is restricted, the driving force of the drive assembly 30 will increase significantly. When it is greater than a certain threshold, an abnormal signal alarm or shutdown can be issued through the controller to avoid accidents, which also improves the safety of the entire lifting device.

[0097] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0098] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A bed lifting device connected to a base (10), characterized in that: include: A height adjustment unit (20), a drive assembly (30) and a fall prevention unit (40); The driving assembly (30) comprises a bearing unit (31), a transmission unit (32) and a driving unit (33); The driving unit (33) is fixedly arranged on the base (10); The bearing unit (31) is arranged on the driving unit (33), the transmission unit (32) is arranged on the height adjustment unit (20), and the transmission unit (32) is in sliding contact with the bearing unit (31); The anti-fall unit (40) is connected to the transmission unit (32) and / or the bearing unit (31).

2. The bed lifting device according to claim 1, characterized in that: The anti-falling unit (40) is connected to the carrying unit (31), a sliding groove (41) is provided on the anti-falling unit (40), and a part of the transmission unit (32) extends into the sliding groove (41) and slidably cooperates with the sliding groove (41).

3. The bed lifting device according to claim 2, characterized in that: The transmission unit (32) comprises a rolling element (321) and a rolling shaft (322); the rolling element (321) is rotatably mounted on the height adjustment unit (20) via the rolling shaft (322); one end of the rolling shaft (322) extends into the sliding groove (41) and is slidably engaged with the sliding groove (41).

4. The bed lifting device according to claim 1, characterized in that: The anti-fall unit (40) comprises a follower (42), a sliding groove (41) is provided on the carrying unit (31), one end of the follower (42) is connected to the transmission unit (32), and the other end of the follower (42) is located in the sliding groove (41) and slidably cooperates with the sliding groove (41).

5. The bed lifting device according to claim 4, characterized in that: The transmission unit (32) comprises a rolling element (321) and a rolling shaft (322); the rolling element (321) is rotatably mounted on the height adjustment unit (20) via the rolling shaft (322); one end of the follower (42) is connected to the rolling shaft (322); the other end of the follower (42) is located in the sliding groove (41) and is slidably matched with the sliding groove (41).

6. The bed lifting device according to claim 1, characterized in that: The bearing unit (31) has a curved surface (311), and the transmission unit (32) is in contact with the curved surface (311).

7. The bed lifting device according to claim 1, characterized in that: The driving unit (33) comprises a fixed portion (331) and a movable portion (332) connected to the fixed portion (331); the fixed portion (331) is fixedly arranged on the base (10), and the bearing unit (31) is arranged on the movable portion (332).

8. The bed lifting device according to claim 1, characterized in that: The bearing unit (31) is arranged on the base (10) and is slidably matched with the base (10).

9. The bed lifting device according to any one of claims 1 to 8, characterized in that: The positions of the bearing unit (31) and the transmission unit (32) are interchangeable.

10. A hospital bed, characterized in that: It comprises a hospital bed lifting device as claimed in any one of claims 1 to 9, a base (10) and a bed board (200), wherein a first end of the height adjustment unit (20) is rotatably connected to the base (10), and a second end of the height adjustment unit (20) is rotatably connected to the bed board (200).

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