Multi-stage lifting mechanism of bed frame

Abstract

The utility model relates to a lifting mechanism, in particular to a multi-stage lifting mechanism of a bed frame. The utility model discloses a multi-stage lifting mechanism of a bed frame. The multi-stage lifting mechanism comprises a first rectangular bed frame and a first multi-stage lifting mechanism arranged in the first rectangular bed frame, the first bed board is erected above the first rectangular bed frame; the first multi-stage lifting mechanism comprises a first fixed frame, a first lifting support and a first movable frame arranged in the first fixed frame, and the first movable frame can slide in the first fixed frame. One end of the first lifting support is in sliding connection with the first fixing frame, and the other end of the first lifting support is a free end. The first lifting support lowers or lifts the first bed board through reciprocating sliding of the first moving frame. The bed board can be effectively lifted to a higher height through multi-stage and staged work of the lifting mechanism, meanwhile, the working condition of the motor can be reduced, the structure is simplified, and installation is convenient.

Description

Technical Field

[0001] This application relates to lifting mechanisms, and more particularly to a multi-stage lifting mechanism for a bed frame. Background Technology

[0002] With the continuous development of modern home design, people's requirements for bed frames are no longer limited to practicality and comfort, but also include aesthetics and space utilization. Traditional bed frame designs often suffer from excessive thickness, which not only affects the overall aesthetics of the bedroom but also occupies valuable indoor space. Therefore, the market demand for ultra-thin bed frames is growing.

[0003] However, designing ultra-thin bed frames is no easy task. The significant reduction in frame thickness presents serious challenges to stress distribution and load-bearing capacity. Achieving height adjustment in ultra-thin bed frames typically requires a sophisticated lifting mechanism. However, when the bed frame height is reduced to around 50mm, the space for the lifting mechanism is severely limited, leading to a drastic reduction in the size of the power arm. This change forces the motor to bear a greater load, increasing the required motor thrust. To address this issue, some manufacturers have attempted to use multiple motors to lift the bed board, but this approach not only increases manufacturing costs but also introduces challenges in synchronizing motor control.

[0004] Furthermore, the design of ultra-thin bed frames must also consider user safety and experience. Traditional bed frame structures may pose a risk of fingers being pinched during raising and lowering, especially when the bed frame is raised, as users' fingers can easily get caught in the gap between the bed frame and the bed board. This problem is particularly prominent in the design of ultra-thin bed frames, because the gaps in ultra-thin bed frames are often smaller, making it easier for fingers to be pinched. Utility Model Content

[0005] The purpose of this application is to overcome one of the shortcomings of the prior art and propose an improved multi-stage lifting structure. This is mainly achieved by simplifying and innovatively designing the lifting structure, which allows for a further reduction in the overall thickness of the bed, while also reducing the installation difficulty and manufacturing cost of this type of structure.

[0006] A multi-stage lifting mechanism for a bed frame.

[0007] A first rectangular bed frame, and a first multi-stage lifting mechanism disposed within the first rectangular bed frame;

[0008] And the first bed board erected above the first rectangular bed frame;

[0009] The first multi-stage lifting mechanism includes a first fixed frame, a first lifting bracket, and a first movable frame disposed inside the first fixed frame, wherein the first movable frame can slide within the first fixed frame.

[0010] One end of the first lifting support is in sliding connection with the first fixed frame, and the other end is a free end;

[0011] The first lifting support lowers or raises the first bed plate through reciprocating sliding of the first moving frame.

[0012] Further, the first rectangular frame comprises a first edge frame, a second edge frame, a third edge frame and a fourth edge frame;

[0013] The first fixed frame is in the shape of a Chinese character 'n', comprising a fifth edge frame, a sixth edge frame and a seventh edge frame connected in sequence;

[0014] The fifth edge frame and the seventh edge frame are arranged in parallel, and the first fixed frame and the fourth edge frame enclose a rectangle;

[0015] The first moving frame is in the shape of a Chinese character 'n', comprising an eighth edge frame, a ninth edge frame and a tenth edge frame connected in sequence;

[0016] The eighth edge frame and the tenth edge frame outside each other are respectively provided with a first pulley and a second pulley, and the inner side of the fifth edge frame and the seventh edge frame is provided with a first sliding rail matched with the first pulley and the second pulley;

[0017] The first lifting support comprises a first connecting rod, a first top pulley, a second connecting rod, a third pulley, a third connecting rod, a second top pulley, a fourth connecting rod and a fourth fixed pulley, and a first tension motor;

[0018] The third pulley and the fourth fixed pulley are arranged in the first sliding rail; the third pulley is in sliding connection with the first sliding rail, and the fourth fixed pulley is in fixed connection with the first sliding rail;

[0019] One end of the first tension motor is in fixed connection with the sixth edge frame or the second edge frame, and the other end of the first tension motor is in fixed connection with the ninth edge frame; the first tension motor can pull the first moving frame to move in the first fixed frame.

[0020] Further, one end of the first connecting rod is hinged to the first pulley, and the other end of the first connecting rod is hinged to one end of the second connecting rod; the two connecting rods are hinged through the first top pulley;

[0021] The other end of the second connecting rod is hinged to one end of the third connecting rod, and the two rods are hinged through the third pulley;

[0022] The other end of the third connecting rod is hinged to one end of the fourth connecting rod, and the two connecting rods are hinged through the second top pulley;

[0023] The other end of the fourth connecting rod is hinged to the fourth fixed pulley.

[0024] Further, the second connecting rod is provided with a first notch near the lower edge of the third pulley; the fourth connecting rod is provided with a second notch near the lower edge of the fourth fixed wheel;

[0025] The outer side of the eighth side frame and the tenth side frame is provided with a first stop pin, and the outer side of the fifth side frame and the seventh side frame is provided with a second stop pin, the first stop pin is arranged below the first connecting rod; the second stop pin is arranged below the fourth connecting rod, and is aligned with the position of the second notch.

[0026] Further, the first bed plate is provided with a first connecting plate hinged to the bottom thereof, the area of the first connecting rod is smaller than that of the first connecting plate, and the first connecting plate is embedded in the first bed plate; the first connecting plate is hinged to one end of the second connecting rod respectively; when the first bed plate is lifted, the first connecting plate will be separated from the first bed plate.

[0027] Further, it further comprises a second rectangular bed frame and a second multi-stage lifting mechanism arranged in the second rectangular bed frame;

[0028] and a second bed plate and a third bed plate hinged to each other above the second rectangular bed frame;

[0029] The second multi-stage lifting mechanism comprises a second fixed frame, a second lifting support and a second moving frame arranged in the second fixed frame, and the second moving frame can slide in the second fixed frame;

[0030] One end of the second lifting support is in sliding connection with the fixed frame, and the other end is hinged to the second bed plate;

[0031] The third bed plate is connected to the second rectangular bed frame through a first linkage rod;

[0032] The second lifting support lowers or raises the second bed plate and the third bed plate through reciprocating sliding of the second moving frame.

[0033] Further, the second rectangular frame comprises a first surrounding edge, a second surrounding edge, a third surrounding edge and a fourth surrounding edge;

[0034] The second fixed frame is in the shape of the letter "N" and comprises a fifth surrounding edge, a sixth surrounding edge and a seventh surrounding edge connected in sequence;

[0035] The fifth surrounding edge and the seventh surrounding edge are arranged in parallel, and two ends are connected to the second surrounding edge and the sixth surrounding edge respectively;

[0036] The second moving frame is in the shape of the letter "N" and comprises an eighth surrounding edge, a ninth surrounding edge and a tenth surrounding edge connected in sequence;

[0037] The fifth sliding rail and the sixth sliding rail are arranged on the inner sides of the fifth frame and the seventh frame respectively.

[0038] The second lifting support comprises left-right symmetrical fifth connecting rods, third top wheels, sixth connecting rods, seventh sliding wheels, seventh connecting rods, fourth top wheels, eighth connecting rods and eighth fixed wheels, and a second pull rod motor.

[0039] The seventh sliding wheel and the eighth fixed wheel are arranged in the second sliding rail.

[0040] The outer sides of the eighth surrounding edge and the tenth surrounding edge are provided with third stop pins, and the outer sides of the fifth surrounding edge and the seventh surrounding edge are provided with fourth stop pins.

[0041] One end of the second pull rod motor is fixedly connected with the fourth frame, and the other end of the second pull rod motor is fixedly connected with the ninth frame.

[0042] Further, the first connecting rod, the second connecting rod, the third connecting rod, the fourth connecting rod, the fifth connecting rod, the sixth connecting rod, the seventh connecting rod and the eighth connecting rod are further provided with reinforcing plates.

[0043] The utility model discloses the beneficial effect:

[0044] 1) can through the multistage and the stage work of lifting mechanism, effectively the bed board is lifted to higher height, can reduce the work of motor simultaneously, simplify the structure, be convenient for installation, and compared with traditional technology, can further save product cost. DRAWINGS

[0045] Figure 1 It is the structure diagram of the first lifting mechanism in the utility model embodiment Figure 1 ;

[0046] Figure 2 It is the side view of the first lifting mechanism in the utility model embodiment

[0047] Figure 3 It is the structure diagram of the first lifting mechanism in the utility model embodiment Figure 2 ;

[0048] Figure 4 It is a schematic view of the first lifting mechanism pulling the lifting bed plate in the embodiment of the utility model;

[0049] Figure 5 It is a structural schematic of the second lifting mechanism in the embodiment of the utility model Figure 1 ;

[0050] Figure 6 It is a side view of the second lifting mechanism in the embodiment of the utility model;

[0051] Figure 7 It is a structural schematic of the second lifting mechanism in the embodiment of the utility model Figure 2 ;

[0052] Figure 8 It is a schematic view of the second lifting mechanism pulling the lifting bed plate in the embodiment of the utility model;

[0053] The drawing mark: 1 first rectangular bed frame;11 first frame;12 second frame;13 third frame;14 fourth frame;2 first multistage lifting mechanism;21 first fixed frame;211 fifth frame;212 sixth frame;213 seventh frame;214 first slide rail;22 first lifting support;221 first connecting rod;222 first top wheel;223 second connecting rod;2231 first notch;224 third pulley;225 third connecting rod;226 second top wheel;227 fourth connecting rod;2271 second notch;228 fourth fixed wheel;229 first pull motor;23 first moving frame;231 eighth frame;232 ninth frame;233 tenth frame;234 first pulley;235 second pulley;236 first limit pin;237 second limit pin;24 first bed plate;Second rectangular bed frame;31 first surrounding edge;32 second surrounding edge;33 third surrounding edge;34 fourth surrounding edge;4 second multistage lifting mechanism;41 second fixed frame;411 fifth surrounding edge;412 sixth surrounding edge;413 seventh surrounding edge;42 second lifting support;421 fifth connecting rod;422 third top wheel;423 sixth connecting rod;424 seventh pulley;425 seventh connecting rod;426 fourth top wheel;427 eighth connecting rod;428 eighth fixed wheel;429 second pull rod motor;43 second moving frame;431 eighth surrounding edge;432 ninth surrounding edge;433 tenth surrounding edge;434 fifth pulley;435 sixth pulley;436 reinforcing plate;437 third limit pin;438 fourth limit pin;51 second bed plate;52 third bed plate;521 first linkage rod. DETAILED DESCRIPTION

[0054] The features of the present application will be further described below in conjunction with the embodiments.

[0055] The specific structural and functional details disclosed herein are merely representative and are intended to describe exemplary embodiments of this application. However, this application may be implemented in many alternative forms and should not be construed as being limited solely to the embodiments set forth herein.

[0056] like Figure 1 As shown, a multi-stage lifting mechanism for a bed frame includes a first rectangular bed frame 1, a first multi-stage lifting mechanism 2 disposed within the first rectangular bed frame 1, and a first bed board 24 mounted above the first rectangular bed frame 1. The first multi-stage lifting mechanism 2 includes a first fixed frame 21, a first lifting bracket 22, and a first movable frame 23 disposed within the first fixed frame 21, the first movable frame 23 being slidable within the first fixed frame 21. One end of the first lifting bracket 22 is slidably connected to the first fixed frame 21, and the other end is a free end. The first lifting bracket 22 lowers or raises the first bed board 24 by the reciprocating sliding of the first movable frame 23. In this embodiment, when the first lifting bracket 22 is in a flat state, the thickness of the first lifting mechanism is no greater than that of the first rectangular bed frame 1. When viewed from the outside of the bed, the components of the first lifting mechanism can be concealed by the first rectangular bed frame 1, thereby forming an ultra-thin electric bed with only the thickness of the bed frame.

[0057] Further, the first rectangular frame includes a first border 11, a second border 12, a third border 13, and a fourth border 14; the first fixed frame 21 is U-shaped, including a fifth border 211, a sixth border 212, and a seventh border 213 connected in sequence; the fifth border 211 and the seventh border 213 are arranged in parallel, and the first fixed frame 21 and the fourth border 14 form a rectangle; the first movable frame 23 is U-shaped, including an eighth border 231, a ninth border 232, and a tenth border 233 connected in sequence; the outer sides of the mutually parallel eighth border 231 and the tenth border 233 are respectively provided with a first pulley 234 and a second pulley 235, and the inner sides of the fifth border 211 and the seventh border 213 are provided with a first slide rail 214 that matches the first pulley 234 and the second pulley 235; in this embodiment, the first pulley 234 and the second pulley 235 are provided on the outer side of the first movable frame 23 so that the movable frame can slide within the range of the fixed frame. This is an important foundation for using the first lifting bracket 22 to lift the first bed board 24.

[0058] like Figure 2As shown, the first lifting support 22 comprises a first connecting rod 221, a first top pulley 222, a second connecting rod 223, a third pulley 224, a third connecting rod 225, a second top pulley 226, a fourth connecting rod 227, a fourth fixed pulley 228, and a first pulling motor 29; the third pulley 224 and the fourth fixed pulley 228 are arranged in the first sliding rail 214; the third pulley 224 is slidingly connected with the first sliding rail 214, and the fourth fixed pulley 228 is fixedly connected with the first sliding rail 214; one end of the first pulling motor 29 is fixedly connected with the sixth frame or the second frame, and the other end of the first pulling motor 29 is fixedly connected with the ninth frame 232, so that the first pulling motor 29 can pull the first moving frame 23 to move in the first fixed frame 21. In this embodiment, a pulling rod motor is used to provide pulling force for the moving frame, and a pushing rod motor is usually used in the prior art. In order to cooperate with the pulling rod motor, the first lifting support 22 is also improved.

[0059] Further, one end of the first connecting rod 221 is hingedly connected to the first pulley 234, the other end of the first connecting rod 221 is hingedly connected to one end of the second connecting rod 223, and the two connecting rods are hingedly connected through the first top pulley 222; the other end of the second connecting rod 223 is hingedly connected to one end of the third connecting rod 225, and the two rods are hingedly connected through the third pulley 224; the other end of the third connecting rod 225 is hingedly connected to one end of the fourth connecting rod 227, and the two connecting rods are hingedly connected through the second top pulley 226; the other end of the fourth connecting rod 227 is hingedly connected to the fourth fixed pulley 228. In this embodiment, in the flat state, the first moving frame 23 is provided with first and second pulleys 235, which are arranged in the first sliding rail 214 of the first fixed frame 21 to form a sliding mechanism, so that the first moving frame 23 can slide in the first fixed frame 21. One end of the first connecting rod 221 is hingedly connected to the first moving frame 23, and the other end is hingedly connected to the second connecting rod 223. When the whole mechanism is flat, the first connecting rod 221 is arranged on the first stop pin 236 located at the rear end of the first moving frame 23 to prevent the first connecting rod 221 from being turned over under the action of impact force. The first top pulley 222 is hingedly connected between the first connecting rod 221 and the second connecting rod 223, the other end of the second connecting rod 223 is hingedly connected to the third connecting rod 225. The third pulley 224 is arranged between the third connecting rod 225 and the lower frame guide rail. The other side of the third connecting rod 225 is hingedly connected to the fourth connecting rod 227, and the second top pulley 226 is hingedly connected between the third connecting rod 225 and the fourth connecting rod 227.

[0060] The other end of the fourth connecting rod 227 is hingedly connected to a connecting piece fixed to the first fixed frame 21. When flat, the lower edge of the fourth connecting rod 227 is arranged on the second stop pin 237 located at the rear end of the first moving frame 23 to prevent the fourth connecting rod 227 from being turned over under the action of impact force.

[0061] The working principle of the multi-stage lifting mechanism lifting the bed board is explained in detail below. The lifting steps are mainly divided into two stages, as shown in Figure 2 、 3 , 4, stage 1: the motor retracts, pulls the first moving frame group to move to the right, at the same time, drives the first connecting rod 221 to move to the right. At this time, the first connecting rod 221 rotates counterclockwise, the first top wheel 222 and the second top wheel 226 support the first bed board 24, and drive the first bed board 24 to rise. In this movement process, the first, second and third pulleys 224 all slide to the right, the first and second pulleys 235 move at the same speed, and the third pulley 224 moves at a speed less than the first and second pulleys 235. Until the side tube of the first moving frame 23 abuts against the lower end recess of the second connecting rod 223. The pressure between the first top wheel 222 and the back plate gradually decreases until the first top wheel 222 is separated from the first bed board 24, and the pressure between the second top wheel 226 and the first bed board 24 increases. Stage 2 of lifting: the side tube of the first moving frame 23 abuts against the second connecting rod 223, and the first moving frame 23 directly drives the third and fourth connecting rods 227 to rotate until the first bed board 24 is lifted to the maximum angle.

[0062] Further, the first connecting rod 221 is provided with a first notch 2231 near the lower edge of the third pulley 224; the fourth connecting rod 227 is provided with a second notch 2271 near the lower edge of the fourth fixed wheel 228; the outer side of the eighth frame 231 and the tenth frame 233 is provided with a first stop pin 236, and the outer side of the fifth frame and the seventh frame is provided with a second stop pin 237, the first stop pin 236 is arranged below the first connecting rod 221; the second stop pin 237 is arranged below the fourth connecting rod 227, and is aligned with the position of the second notch 2271. In this embodiment, the first and second stop pins 237 are used to prevent the first connecting rod 221 and the fourth connecting rod 227 from moving reversely when they are flattened and rotated, and are used for external force.

[0063] Further, the first bed plate 24 is provided with a first connecting plate 241 hinged to the bottom of the first bed plate 24, the area of the first connecting rod 221 is smaller than that of the first connecting plate 241, and the first connecting rod 221 is embedded in the first bed plate 24; the first connecting plate 241 is hinged to one end of the second connecting rod 223, respectively; when the first bed plate 24 is lifted, the first connecting plate 241 will be separated from the first bed plate 24. In this embodiment, when the electric bed body is flat, the user sometimes needs to put his hand into the space behind the first bed plate 24 to repair or take parts. Because the lifting mechanism is hinged to the back of the first bed plate 24, when the first bed plate 24 is manually lifted, the lifting mechanism will be lifted together, which not only needs to use more force, but also has the risk of pinching the hand. Now the lifting mechanism is connected in the middle of the first bed plate 24, and the first connecting plate 241 is hinged to the lower edge of the first bed plate 24, when the first bed plate 24 is lifted, the first connecting plate 241 connected with the lifting mechanism will naturally drop due to its gravity, and separate from the first bed plate 24, which not only reduces the weight of the first bed plate 24, but also prevents the risk of pinching the hand that may occur.

[0064] As Figure 5 Further, the second rectangular bed frame 3, the second multi-stage lifting mechanism 4 arranged in the second rectangular bed frame 3, and the second bed plate 51 and the third bed plate 52 hinged to each other and arranged above the second rectangular bed frame 3 are further included; the second multi-stage lifting mechanism 4 includes a second fixed frame 41, a second lifting bracket 42, and a second moving frame 43 arranged in the second fixed frame 41, the second moving frame 43 can slide in the second fixed frame 41; one end of the second lifting bracket 42 is connected with the fixed frame in sliding mode, and the other end is hinged to the second bed plate 51; the third bed plate 52 is connected with the second rectangular bed frame 3 through a first linkage rod 521; the second lifting bracket 42 lowers or lifts the second bed plate 51 and the third bed plate 52 through the reciprocating sliding of the second moving frame 43.

[0065] As Figure 5 , 6, 7, further, the second rectangular frame includes a first surrounding edge 31, a second surrounding edge 32, a third surrounding edge 33 and a fourth surrounding edge 34;The second fixed frame 41 is a N-shaped, including the fifth surrounding edge 411, the sixth surrounding edge 412 and the seventh surrounding edge 413 are sequentially connected;The fifth surrounding edge 411 and the seventh surrounding edge 413 are arranged in parallel, and the two ends are connected with the second surrounding edge 32, the sixth surrounding edge 412;The second moving frame 43 is a N-shaped, including the eighth surrounding edge 431, the ninth surrounding edge 432 and the tenth surrounding edge 433 are sequentially connected;The eighth surrounding edge 431 and the tenth surrounding edge 433 are provided with fifth pulley 434 and sixth pulley 435 on the outer side of the two ends, and the inner side of the fifth edge frame 211 and the seventh edge frame 213 is provided with a second sliding rail matched with the fifth pulley 434, the sixth pulley 435;The second lifting support 42 includes left and right symmetrical fifth connecting rod 421, third top wheel 422, sixth connecting rod 423, seventh pulley 424, seventh connecting rod 425, fourth top wheel 426, eighth connecting rod 427 and eighth fixed wheel 428, second pull rod motor 429;The seventh pulley 424 and the eighth fixed wheel 428 are arranged in the second sliding rail;The seventh pulley 424 and the second sliding rail are slidably connected, and the eighth fixed wheel 428 and the second sliding rail are fixedly connected;One end of the second pull rod motor 429 is fixedly connected with the fourth edge frame 14, and the other end of the second pull rod motor 429 is fixedly connected with the ninth edge frame 232, and the second pull rod motor 429 can pull the first moving frame 23 to move in the first fixed frame 21.The lifting principle of the foot is the same as that of the head, except that the first stage third top wheel 422 contacts the third bed plate 52;When the sixth connecting rod 423 contacts the second moving frame 43, the third top wheel 422 is separated from the third bed plate 52;The second lifting stage is that the fourth top wheel 426 contacts the second bed plate 51.

[0066] The working principle of the second lifting support 42 is similar to that of the first lifting support 22, and the first stage: the third top wheel 422 contacts the third bed plate 52, and the fourth top wheel 426 contacts the second bed plate 51;The second stage: the third top wheel 422 is separated from the third bed plate 52, and the fourth top wheel 426 contacts the second bed plate 51.

[0067] The outer side of the eighth surrounding edge and the tenth surrounding edge is provided with a third stop pin, and the outer side of the fifth surrounding edge and the seventh surrounding edge is provided with a fourth stop pin, the third stop pin 437 is arranged below the fifth connecting rod, and is aligned with the third gap of the fifth connecting rod;The fourth stop pin 438 is arranged below the eighth connecting rod, and is aligned with the fourth gap of the eighth connecting rod;

[0068] Further, the first connecting rod 221, the second connecting rod 223, the third connecting rod 225, the fourth connecting rod 227, the fifth connecting rod 421, the sixth connecting rod 423, the seventh connecting rod 425 and the eighth connecting rod 427 are further provided with a reinforcing plate 436, and the reinforcing plate 436 is provided with a bending portion on both sides and is connected with the symmetrical connecting rods. In this embodiment, the reinforcing plate 436 is arranged between the symmetrical connecting rods, so that the strength of the connecting rods on both sides is improved, and the bed plate is better improved.

[0069] The foregoing description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0070] Furthermore, while advantages associated with some implementations of the technology have been described in the context of those implementations, other implementations can also exhibit such advantages, and not all implementations need necessarily exhibit such advantages to fall within the scope of the technology. Accordingly, the disclosure and associated technology can include other implementations not expressly shown or described herein. Thus, the disclosure is not intended to be limited to the implementations shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-stage lifting mechanism for a bed frame, characterized in that: A first rectangular bed frame, and a first multi-stage lifting mechanism disposed within the first rectangular bed frame; And the first bed board erected above the first rectangular bed frame; The first multi-stage lifting mechanism includes a first fixed frame, a first lifting bracket, and a first movable frame disposed inside the first fixed frame, wherein the first movable frame can slide within the first fixed frame. One end of the first lifting bracket is slidably connected to the first fixed frame, and the other end is a free end; The first lifting bracket lowers or raises the first bed board by reciprocating sliding of the first moving frame.

2. The multi-stage lifting mechanism for a bed frame according to claim 1, characterized in that: The first fixed frame is U-shaped, including a fifth border, a sixth border, and a seventh border connected in sequence; The fifth and seventh borders are arranged in parallel, and the first fixed frame and the fourth border form a rectangle. The first movable frame is U-shaped, including an eighth border, a ninth border, and a tenth border connected in sequence; The outer sides of the eighth and tenth parallel borders are respectively provided with a first pulley and a second pulley, and the inner sides of the fifth and seventh borders are provided with a first slide rail that matches the first pulley and the second pulley; The first lifting bracket includes a first connecting rod, a first top wheel, a second connecting rod, a third pulley, a third connecting rod, a second top wheel, a fourth connecting rod, and a fourth fixed wheel, all symmetrically arranged on both sides, as well as a first tension motor; The third pulley and the fourth fixed wheel are disposed within the first slide rail; the third pulley is slidably connected to the first slide rail, and the fourth fixed wheel is fixedly connected to the first slide rail; One end of the first tension motor is fixedly connected to the sixth or second frame, and the other end of the first tension motor is fixedly connected to the ninth frame. The first tension motor can pull the first movable frame to move within the first fixed frame.

3. The multi-stage lifting mechanism for a bed frame according to claim 2, characterized in that: One end of the first connecting rod is hinged to the first pulley, and the other end of the first connecting rod is hinged to one end of the second connecting rod. The two connecting rods are hinged together by the first top wheel. The other end of the second link is hinged to one end of the third link, and the two links are hinged together by a third pulley; The other end of the third link is hinged to one end of the fourth link, and the two links are hinged together by a second top wheel. The other end of the fourth link is hinged to the fourth fixed wheel.

4. The multi-stage lifting mechanism for a bed frame according to claim 2, characterized in that: The second connecting rod has a first notch near the lower edge of the third pulley; the fourth connecting rod has a second notch near the lower edge of the fourth fixed wheel. The outer sides of the eighth and tenth frame are provided with first stop pins, and the outer sides of the fifth and seventh frame are provided with second stop pins. The first stop pin is located below the first connecting rod; the second stop pin is located below the fourth connecting rod and aligned with the position of the second notch.

5. The multi-stage lifting mechanism for a bed frame according to claim 2, characterized in that: It also includes a second rectangular bed frame and a second multi-stage lifting mechanism disposed within the second rectangular bed frame; And a second bed board and a third bed board that are hinged to each other and mounted above the second rectangular bed frame; The second multi-stage lifting mechanism includes a second fixed frame, a second lifting bracket, and a second movable frame disposed inside the second fixed frame, wherein the second movable frame can slide within the second fixed frame; One end of the second lifting bracket is slidably connected to the fixed frame, and the other end is hinged to the second bed board; The third bed board is connected to the second rectangular bed frame via a first linkage rod; The second lifting bracket lowers or raises the second and third bed boards by reciprocating sliding of the second moving frame.

6. The multi-stage lifting mechanism for a bed frame according to claim 5, characterized in that: The second fixed frame is U-shaped, including a fifth, sixth, and seventh perimeter connected in sequence; The fifth and seventh perimeters are arranged in parallel, with their ends connected to the second and sixth perimeters, respectively. The second movable frame is U-shaped, including an eighth, ninth, and tenth perimeter connected in sequence; The eighth and tenth perimeters are respectively provided with a fifth pulley and a sixth pulley at both ends of their outer sides, and the inner sides of the fifth and seventh frame frames are provided with a second slide rail that matches the fifth pulley and the sixth pulley; The second lifting bracket includes a fifth link, a third top wheel, a sixth link, a seventh pulley, a seventh link, a fourth top wheel, an eighth link, and an eighth fixed wheel, all symmetrically arranged on the left and right sides, as well as a second pull rod motor; The seventh pulley and the eighth fixed wheel are disposed within the second slide rail; the seventh pulley is slidably connected to the second slide rail, and the eighth fixed wheel is fixedly connected to the second slide rail; The outer sides of the eighth and tenth perimeters are provided with a third stop pin, and the outer sides of the fifth and seventh perimeters are provided with a fourth stop pin. The third stop pin is located below the fifth link and aligned with the third notch of the fifth link; the fourth stop pin is located below the eighth link and aligned with the fourth notch of the eighth link. One end of the second pull rod motor is fixedly connected to the fourth frame, and the other end of the second pull rod motor is fixedly connected to the ninth frame. The second pull rod motor can pull the first movable frame to move within the first fixed frame.

7. The multi-stage lifting mechanism for a bed frame according to claim 6, characterized in that: A reinforcing plate is provided between the first link, the second link, the third link, the fourth link, the fifth link, the sixth link, the seventh link, and the eighth link. The reinforcing plate has bends on both sides that connect to symmetrical links.

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