Waist supporting device and bed frame

Abstract

The utility model provides a waist supporting device and a bedstead, and relates to the technical field of furniture, and the waist supporting device comprises a waist supporting plate, a vertical lifting mechanism and an anti-tilting mechanism. Wherein the vertical lifting mechanism is assembled on the bed frame, the upper end of the vertical lifting mechanism is supported on the waist supporting plate, and the vertical lifting mechanism is used for driving the waist supporting plate to do vertical lifting motion; the anti-tilting mechanism is arranged between the waist supporting plate and the vertical lifting mechanism and is used for limiting the waist supporting plate to tilt relative to the vertical lifting mechanism on one side when the waist supporting plate is stressed unevenly. Therefore, the anti-tilting device has the advantages of anti-tilting function and high stability.

Description

Technical Field

[0001] This utility model relates to the field of furniture technology, and in particular to a lumbar support device and a bed frame. Background Technology

[0002] With the development of technology, smart homes have become increasingly popular, and electric beds have gradually become common household items in modern homes due to their comfort.

[0003] To further enhance user comfort, in addition to the traditional head, back, and leg lifting functions, a lumbar support function has been incorporated into the electric bed. This lumbar support function provides extra support for the lower back, helping users maintain the natural curve of the spine, reducing lumbar pressure, and effectively relieving lumbar fatigue to improve sleep quality. However, in actual use, the lumbar support plate is prone to tilting or shifting to one side when subjected to uneven force, leading to uneven support and jamming. This not only affects the stability of the support but also reduces user comfort and may even damage the structure, affecting the lifespan and safety of the device.

[0004] Therefore, a lumbar support device and bed frame with anti-tilting function and high stability need to be designed. Utility Model Content

[0005] The purpose of this utility model is to address the defects and shortcomings of the existing technology by providing a lumbar support device and bed frame, which solves at least one of the above-mentioned technical problems and has the advantages of anti-tilting function and high stability.

[0006] To achieve the above objectives, this utility model provides a waist support device, comprising:

[0007] Top waist support plate;

[0008] A vertical lifting mechanism is mounted on the bed frame, with its upper end supported by the top and waist support plate, and is used to drive the top and waist support plate to perform vertical lifting movements.

[0009] An anti-tilting mechanism is provided between the top waist support plate and the vertical lifting mechanism to prevent the top waist support plate from tilting up on one side relative to the vertical lifting mechanism when the top waist support plate is subjected to uneven force.

[0010] Optionally, the vertical lifting mechanism includes:

[0011] The linkage rod has its upper end supported on the top waist support plate and can move along the length of the top waist support plate;

[0012] The translation and lifting assembly has its output end hinged to the linkage rod, which is used to drive the linkage rod to perform translation and lifting movements;

[0013] A vertical guide assembly is fixed to the bed frame and connected to the top and waist support plate to limit the lateral displacement of the top and waist support plate.

[0014] Optionally, the anti-tipping mechanism includes:

[0015] A limiting plate is disposed below the top waist support plate and has a limiting hole disposed along the length direction of the top waist support plate;

[0016] A limiting post is provided on the linkage rod and passes through or is partially inserted into the limiting hole, and slides in cooperation with the limiting hole.

[0017] Optionally, the vertical guide assembly includes: a first guide shaft, a second guide shaft, and a slider;

[0018] The first guide shaft is slidably engaged with the slider, one end of which is vertically fixed to the bed frame, and the other end is provided with a limiting screw to prevent separation from the slider;

[0019] The second guide shaft is slidably engaged with the slider, with one end vertically fixed to the top waist support plate and the other end provided with a limiting screw to prevent separation from the slider.

[0020] Optionally, the two sets of vertical guide components are arranged between the top waist support plate and the bed frame along the length direction of the top waist support plate.

[0021] Optionally, the lumbar support device further includes a fixing frame mounted below the lumbar support board of the bed frame; one end of the vertical guide assembly away from the lumbar support plate is vertically fixed to the fixing frame.

[0022] Optionally, the translation and lifting assembly includes:

[0023] Two linkage assemblies, one end of each linkage assembly is hinged to one end of the linkage rod, and the other end is hinged to the fixed frame, forming a parallel four-bar linkage with the linkage rod and the line connecting the hinge points of the two linkage assemblies to the bed frame;

[0024] A drive motor, fixed to the bed frame, is used to drive the parallel four-bar linkage.

[0025] Optionally, the end of the linkage assembly away from the linkage rod is provided with an angle limiting block;

[0026] The angle limiting block is used to abut against the fixing frame when the top waist support plate is in a flat state, restricting the linkage assembly from continuing to swing downward, so as to maintain a preset angle between the linkage rod and the linkage assembly.

[0027] Optionally, the linkage rod is provided with wheel frames at both ends; it also includes rollers rotatably disposed in the wheel frames; the lower surface of the top waist support plate is provided with a rolling groove extending along its length direction for the rollers to roll.

[0028] The linkage assembly includes two symmetrically arranged sheet metal parts relative to the linkage rod; one end of each of the sheet metal parts is hinged to the wheel frame, and the other end is hinged to the lug plate of the fixed frame; the angle limiting block is disposed at the end of the sheet metal part away from the linkage rod.

[0029] Another aspect of this utility model provides a bed frame, including: a lumbar support board and a lumbar support device as described above; the lumbar support board is fixed to the lumbar support plate and is vertically lifted and lowered under the drive of the lumbar support device.

[0030] Compared with the prior art, the advantages of this application are:

[0031] Because the lumbar support device incorporates an anti-tilting mechanism between the lumbar support plate and the vertical lifting mechanism, it prevents the lumbar support plate from tilting to one side relative to the vertical lifting mechanism when the force on the lumbar support plate is uneven. This effectively prevents the lumbar support plate from tilting to one side relative to the vertical lifting mechanism when the force on the lumbar support plate is uneven or one side is subjected to greater force, thus preventing the lumbar support plate from deflecting or becoming unstable due to unbalanced forces, improving the overall structural stability; furthermore, it effectively limits the tilting of the lumbar support plate to one side, thereby enhancing user comfort. Attached Figure Description

[0032] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the top waist device and the top waist plate in the lifting state according to an embodiment of the present utility model;

[0034] Figure 2 This is a schematic diagram of the top waist device and top waist plate in a flattened state according to an embodiment of the present utility model;

[0035] Figure 3 This is a partial exploded view of the top waist device and top waist plate in an embodiment of this utility model;

[0036] Figure 4 This is a front view of the waist-lifting device according to an embodiment of the present utility model, wherein the waist-lifting device is in a lifting state;

[0037] Figure 5 This is a front view of the waist support device according to an embodiment of the present utility model, wherein the waist support device is in a flat position;

[0038] Figure 6 This is a partial exploded view of the top waist device according to an embodiment of the present utility model;

[0039] Figure 7 This is a top view of a portion of the structure of the top waist device according to an embodiment of this utility model;

[0040] Figure 8 This is a partial exploded view of the top waist device according to an embodiment of the present utility model;

[0041] Figure 9 This is an exploded view of the vertical guide component and the fixing frame in an embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures

[0043] 100-Top waist device;

[0044] 1-Top waist support plate; a-Rolling groove; o1-Through hole;

[0045] 2-Linkage rod; 21-Avoidance section; 22-Wheel frame; 23-Roller;

[0046] 3-Translation and lifting assembly; 31-Linkage assembly; 311-Linkage sheet metal part; 312-Angle limit block; 32-Push rod motor;

[0047] 4-Vertical guide assembly; 41-First guide shaft; 42-Second guide shaft; 43-Slider; o2-First guide hole; o3-Second guide hole; 44-Limit screw;

[0048] 5-Anti-tilting mechanism; 51-Limiting plate; 04-Limiting hole; 52-Limiting post;

[0049] 6-Fixed bracket;

[0050] 7-Motor mounting bracket;

[0051] 200-Top Waistboard;

[0052] 300 - Lumbar support board; o5 - Long hole. Detailed Implementation

[0053] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0054] It should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "back," "side," and "circumferential" used in this utility model to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. In addition, the terms "first" and "second" are only used to distinguish multiple parts or structures with the same or similar structures, and do not indicate any special limitation on the arrangement order or connection relationship.

[0055] Please refer to Figures 1 to 9 This utility model embodiment provides a waist support device 100, including: a waist support plate 1, a vertical lifting mechanism, and an anti-tilting mechanism 5. All of the above structures must be made of materials with sufficient supporting strength.

[0056] The top waist support plate 1 is fixed below the top waist plate 200 and is used to drive the top waist plate 200 to move vertically when it makes vertical lifting and lowering movements, so as to realize the waist support function of the electric bed (not shown in the figure).

[0057] The vertical lifting mechanism is mounted on the bed frame (not shown in the figure). Optionally, the vertical lifting mechanism is mounted below the lumbar support plate 300 of the bed frame. The upper end of the vertical lifting mechanism is supported on the lumbar support plate 1 and is used to drive the lumbar support plate 1 to perform vertical lifting movements.

[0058] The anti-tilting mechanism 5 is disposed between the top waist support plate 1 and the vertical lifting mechanism. It is used to prevent the top waist support plate 1 from tilting up on one side relative to the vertical lifting mechanism when the top waist support plate 1 is subjected to uneven force, for example, when one side is subjected to downward pressure.

[0059] Thus, when the top and waist support plate 1 is subjected to uneven force or one side is subjected to greater force, it can effectively limit the top and waist support plate 1 from tilting up on one side relative to the vertical lifting mechanism, prevent the top and waist support plate 1 from deflecting or becoming unstable due to unbalanced force, and improve the stability of the overall structure; thereby effectively limiting the tilting up of one side of the top and waist plate 200, thereby improving the user's comfort.

[0060] To achieve stable vertical lifting of the waist support device, optionally, please refer to... Figure 2 and Figure 3In this embodiment, the vertical lifting mechanism includes: a linkage rod 2, a translational lifting assembly 3, and a vertical guide assembly 4. The upper end of the linkage rod 2 is supported on the top waist support plate 1 and can move along the length of the top waist support plate 1. That is, the linkage rod 2 provides support force to the top waist support plate 1 and can move laterally relative to the top waist support plate 1. The translational lifting assembly 3 is mounted below the waist bed board 300 of the bed frame, and its output end is hinged to the linkage rod 2 to drive the linkage rod 2 to perform translational lifting motion. That is, the translational lifting assembly 3 drives the linkage rod 2 to perform vertical lifting motion while also enabling the linkage rod 2 to perform horizontal translational motion. The vertical guide assembly 4 is fixed to the bed frame and connected to the top waist support plate 1 to limit the lateral displacement of the top waist support plate 1. That is, when the translational lifting assembly 3 and the linkage rod 2 move, the linkage rod 2 provides vertical and lateral forces to the top waist support plate 1, and the vertical guide assembly 4 limits the lateral displacement of the top waist support plate 1, so that it only performs vertical lifting motion.

[0061] To achieve the anti-tilting function of the waist support device 100, optionally, please refer to... Figure 3 and Figure 6 In this embodiment, the anti-tilting mechanism 5 includes: a limiting plate 51 and a limiting post 52.

[0062] The limiting plate 51 is located below the top waist support plate 1 and has a limiting hole o4 arranged along the length direction of the top waist support plate 1. Specifically, the limiting plate 51 is an L-shaped bent plate, the horizontal section of which is fixed to the bottom of the top waist support plate 1 by welding or fasteners, or is integrally formed with the top waist support plate 1; the vertical section is provided with a limiting hole o4.

[0063] A limiting post 52 is disposed on the linkage rod 2, passes through the limiting hole o4, and slides in engagement with the limiting hole o4. Specifically, the limiting post 52 can be fixed to one side of the linkage rod 2 by welding or fasteners. Of course, in some other embodiments, the end of the limiting post 52 away from the linkage is only partially inserted into the limiting hole o4 and slides in engagement with the limiting hole o4. As long as it can achieve the anti-tilting function of the waist support device 100, it is acceptable.

[0064] Thus, when the translation and lifting assembly 3 drives the linkage rod 2 to move, the limiting post 52 slides horizontally along the limiting hole o4; when the top waist support plate 1 is subjected to uneven force, the limiting post 52 restricts the limiting plate 51 from tilting upward, thereby preventing the top waist support plate 1 from tilting relative to one side of the linkage rod 2. Understandably, the anti-tilting mechanism 5 can be one or more, and no specific limitation is made here. Of course, to avoid interference with the vertical lifting mechanism, the anti-tilting mechanism 5 must be set away from both ends of the top waist support plate 1.

[0065] To match the waist-supporting stroke of the waist-supporting device 100 while reducing the space occupied by the vertical guide assembly, optionally, please refer to... Figure 6 and Figure 9 In this embodiment, the vertical guide group includes: a first guide shaft 41, a second guide shaft 42, and a slider 43.

[0066] The slider 43 has a first guide hole o2 and a second guide hole o3 spaced apart. Specifically, in this embodiment, the slider 43 has two first guide holes o2 spaced apart. The second guide hole o3 is disposed between the two first guide holes o2.

[0067] Two first guide shafts 41 are slidably engaged with the slider 43 through the first guide hole o2. One end of each shaft is vertically fixed to the bed frame, and the other end is provided with a limiting screw 44 to prevent separation from the slider 43. Specifically, one end of the first guide shaft 41 is fixed to the fixing bracket 6 of the bed frame.

[0068] The second guide shaft 42 slides with the slider 43 through the second guide hole o3. One end of the shaft is vertically fixed to the top waist support plate 1, and the other end is provided with a limit screw 44 to prevent separation from the slider 43.

[0069] In this way, by setting the two guide shafts in a staggered superposition in the vertical direction, it can match the large stroke of the top waist device 100 while avoiding the disadvantage of large space occupation caused by using a single guide shaft.

[0070] Understandably, in some other embodiments, the first guide shaft 41 and the second guide shaft 42 may also be configured as one, without specific limitations.

[0071] Further, please refer to Figure 3 and Figure 6 In this embodiment, both the top waist support plate 1 and the top waist plate 200 have through holes o1 to allow the first guide shaft 41 to pass away from the end of the fixing frame 6. In this way, the space occupied by the first guide shaft 41 can be reduced while increasing its size.

[0072] To improve the stability of the movement, optionally, please refer to... Figure 4 and Figure 6 In this embodiment, two sets of vertical guide components 4 are arranged between the top waist support plate 1 and the bed frame along the length of the top waist support plate 1. That is, the two sets of vertical guide components 4 are respectively arranged near one end of the top waist support plate 1.

[0073] To facilitate the installation of the vertical guide assembly 4 and the translation and lifting assembly 3, the lumbar support device 100 may optionally include a fixing frame 6. The fixing frame 6 is mounted below the lumbar bed board 300 of the bed frame. The end of the vertical guide assembly 4 away from the lumbar support plate 1 is vertically fixed to the fixing frame 6. Specifically, in this embodiment, the end of the first guide shaft 41 away from the lumbar support plate 1 is vertically fixed to the fixing frame 6 to achieve vertical fixation to the bed frame.

[0074] To drive linkage 2 to perform stable translational and lifting movements, optionally, please refer to... Figure 3 In this embodiment, the translation and lifting assembly 3 includes two linkage assemblies 31 and a drive motor.

[0075] One end of each linkage assembly 31 is hinged to one end of the linkage 2, and the other end is hinged to the bed frame. Specifically, in this embodiment, the end of the linkage assembly 31 away from the linkage 2 is hinged to the fixing frame 6 of the bed frame. The lines connecting the hinge points of the two linkage assemblies 31 and the linkage 2, and the two linkage assemblies 31 and the fixing frame 6 of the bed frame, form a parallel four-bar linkage.

[0076] The drive motor is fixed to the bed frame and is used to drive the parallel four-bar linkage. That is, the output end of the drive motor can be connected to either the linkage 2 or one of the two linkage assemblies 31 to provide power for the movement of the parallel four-bar linkage. Optionally, please refer to... Figure 6 and Figure 7 In this embodiment, the drive motor is a push rod motor 32 rotatably mounted on the bed frame, and its output end is rotatably connected to the linkage 2. Specifically, the lumbar support device 100 also includes a motor mounting bracket 7 fixed below the lumbar bed board 300 of the bed frame; the push rod motor 32 is hinged to the motor mounting bracket 7 and located between the two linkage assemblies 31, and the extension direction of its push rod forms an obtuse angle with the extension direction of the linkage assembly 31. Because the extension direction of the push rod of the push rod motor 32 forms an obtuse angle with the extension direction of the linkage assembly 31, the push rod of the push rod motor 32 can provide vertical force while providing lateral movement power for the linkage assembly 31. Of course, in other embodiments, the drive motor can also be a servo motor, whose output shaft is connected to one of the two linkage assemblies 31 through a reducer, thereby driving the parallel four-bar linkage to move; no specific limitation is imposed.

[0077] In this way, the translation and lifting assembly 3 can have the advantages of vertical lifting, and also has the advantages of a relatively simple and compact structure. In addition, by driving the top and waist support plate 1 through the parallel four-bar mechanism, the top and waist support plate 1 can be raised and lowered smoothly, improving the comfort of use.

[0078] To prevent the connecting rod assembly 31 from continuing to swing downwards when the top waist device 100 is in the flat position, thus causing the drive motor's initial lifting angle to be insufficient or zero, resulting in low working efficiency, difficulty in starting, or even failure to drive normally. Optionally, please refer to Figure 5 , Figure 6 and Figure 8In this embodiment, an angle limiting block 312 is provided at the end of the linkage assembly 31 away from the linkage rod 2. The angle limiting block 312 is used to abut against the fixing frame 6 when the top waist support plate 1 is in a flat state, restricting the linkage assembly 31 from continuing to swing downward, so that the linkage rod 2 and the linkage assembly 31 maintain a preset angle. In this way, it can be ensured that the parallel four-bar mechanism has a reasonable driving space and lever arm in the initial state, so that the drive motor can start from an angle with a "lever effect" when working, improving the transmission efficiency and response speed of the driving force.

[0079] To reduce friction between the linkage rod 2 and the top waist support plate 1 during the lifting process and improve the smoothness of movement, alternatively, please refer to... Figure 6 and Figure 8 In this embodiment, the linkage rod 2 has wheel frames 22 at both ends. The top waist device 100 also includes rollers 23 rotatably disposed within the wheel frames 22. The lower surface of the top waist support plate 1 has a rolling groove a extending along its length direction for the rollers 23 to roll. Optionally, the top waist support plate 1 is a U-shaped groove sheet metal part, which can prevent the rollers 23 from derailing.

[0080] Alternatively, please refer to Figure 8 In this embodiment, the fixing frame 6 includes a horizontal plate and two ear plates vertically disposed at both ends of the horizontal plate. The linkage assembly 31 includes two connecting rod sheet metal parts 311 symmetrically disposed relative to the linkage rod 2. One end of each connecting rod sheet metal part 311 is hinged to the wheel frame 22, and the other end is hinged to the ear plate of the connecting rod fixing frame 6. An angle limiting block 312 is disposed at the end of the connecting rod sheet metal part 311 away from the linkage rod 2. In this way, stress concentration can be effectively distributed, improving the rigidity and durability of the entire device.

[0081] To reduce the overall size of the support device 100 while avoiding interference between the linkage rod 2 and the push rod motor 32, please refer to... Figure 7 In this embodiment, the projections of the push rod motor 32 and the two rollers 23 on the horizontal plane are collinear. The linkage rod 2 is recessed to one side to avoid the push rod motor 32.

[0082] Another aspect of this utility model embodiment provides a bed frame (not shown in the figure), including a top waist plate 200 and a top waist device 100 as described above; the top waist plate 200 is fixed on the top waist support plate 1 and achieves vertical lifting and lowering under the drive of the top waist device 100. Optionally, the bed frame also includes a lumbar bed board 300, which has an elongated hole o5 that is arranged laterally and matches the shape of the top waist plate 200; during the lifting and lowering process of the top waist plate 200, the top waist plate 200 has a retracted state that is accommodated in the elongated hole o5, and an extended state that is protruding from the elongated hole o5. Since this bed frame has all the structures and connection relationships of the top waist device 100, it has all the advantages of the top waist device 100, which will not be elaborated here.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the substance of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A torso-lifting device, characterized by The utility model relates to a bed frame, comprising: a top waist support plate (1); a vertical lifting mechanism assembled on the bed frame, the upper end of which is supported on the top waist support plate (1) and is used to drive the top waist support plate (1) to make vertical lifting movement; an anti-lifting mechanism (5) arranged between the top waist support plate (1) and the vertical lifting mechanism and used to limit the top waist support plate (1) from lifting on one side relative to the vertical lifting mechanism when the top waist support plate (1) is subjected to uneven force.

2. The top-waist device of claim 1, wherein The vertical lifting mechanism comprises: a linkage rod (2) having the upper end supported on the top waist support plate (1) and being movable along the length direction of the top waist support plate (1); a translation lifting assembly (3) having the output end articulated with the linkage rod (2) and being used to drive the linkage rod (2) to make translation lifting movement; a vertical guiding assembly (4) fixed on the bed frame and connected with the top waist support plate (1) to limit the lateral displacement of the top waist support plate (1).

3. The top waist device of claim 2, wherein, The anti-lifting mechanism (5) comprises: a limiting plate (51) arranged below the top waist support plate (1) and having a limiting hole (o4) arranged along the length direction of the top waist support plate (1); a limiting column (52) arranged on the linkage rod (2) and penetrating or partially inserted into the limiting hole (o4) and being in sliding fit with the limiting hole (o4).

4. The top waist device of claim 2, wherein The vertical guiding assembly (4) comprises a first guiding shaft (41), a second guiding shaft (42) and a sliding block (43); the first guiding shaft (41) is in sliding fit with the sliding block (43), one end of the first guiding shaft (41) is fixed vertically on the bed frame, and the other end of the first guiding shaft (41) is provided with a limiting screw (44) to prevent the first guiding shaft (41) from being separated from the sliding block (43); the second guiding shaft (42) is in sliding fit with the sliding block (43), one end of the second guiding shaft (42) is fixed vertically on the top waist support plate (1), and the other end of the second guiding shaft (42) is provided with a limiting screw (44) to prevent the second guiding shaft (42) from being separated from the sliding block (43).

5. The top waist device of claim 2, wherein Two groups of the vertical guiding assemblies (4) are arranged between the top waist support plate (1) and the bed frame along the length direction of the top waist support plate (1).

6. The top waist device of claim 2, wherein The utility model further comprises a fixing frame (6) assembled below a waist bed plate (300) of the bed frame; one end of the vertical guiding assembly (4) away from the top waist support plate (1) is fixed vertically on the fixing frame (6).

7. The top waist device of claim 6, wherein The translation lifting assembly (3) comprises: two linkage assemblies (31), one end of each of the linkage assemblies (31) is articulated with one end of the linkage rod (2), the other end of each of the linkage assemblies (31) is articulated with the fixing frame (6), and the line connecting the articulation points of the linkage rod (2) and the two linkage assemblies (31) with the bed frame forms a parallelogram mechanism; a driving motor fixed on the bed frame and used to drive the parallelogram mechanism.

8. The top waist device of claim 7, wherein, One end of the linkage assembly (31) away from the linkage rod (2) is provided with an angle limiting block (312); the angle limiting block (312) is used to abut against the fixing frame (6) when the top waist support plate (1) is in a flat state, so as to limit the linkage assembly (31) from continuing to swing downward, so that a preset included angle is maintained between the linkage rod (2) and the linkage assembly (31).

9. The top waist device of claim 8, wherein, The linkage rod (2) is provided with a wheel bracket (22) at both ends; further comprising a roller (23) rotatably arranged in the wheel bracket (22); the lower surface of the top waist support plate (1) is provided with a rolling groove (a) extending along the length direction thereof for rolling of the roller (23); The linkage rod assembly (31) comprises two linkage sheet metal parts (311) symmetrically arranged relative to the linkage rod (2); one end of each linkage sheet metal part (311) is hingedly connected with the wheel bracket (22), and the other end is hingedly connected with an ear plate of the fixed frame (6); the angle limiting block (312) is arranged at the end of the linkage sheet metal part (311) away from the linkage rod (2).

10. A bed frame, characterized by Comprise: A top waist plate (200) and the top waist device as claimed in any one of claims 1-9; the top waist plate (200) is fixed on the top waist support plate (1) and vertically lifted under the driving of the top waist device.

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