A bed and its lifting bed frame

Abstract

This application discloses a bed and its lifting bed frame. The lifting bed frame includes a lower four-bar linkage, comprising a base rod, a short rocker arm, a long rocker arm, and a long support rod, which are sequentially hinged. An upper four-bar linkage includes an upper rocker arm and a triangular rod. One end of the upper rocker arm is hinged to the middle of the long rocker arm, and the other end of the upper rocker arm is hinged to one end of the triangular rod. The middle of the triangular rod is hinged to the long support rod. A driving member is connected between the base rod and the short rocker arm. During rotation, the lower four-bar linkage has a first extreme position and a second extreme position. In the first extreme position, the projection of the angle between the short rocker arm and the driving member onto the rotation plane of the lower four-bar linkage is an obtuse angle. In the second extreme position, the projection of the angle between the short rocker arm and the driving member onto the rotation plane of the lower four-bar linkage is an acute angle. This application discloses a bed and its lifting bed frame, which are convenient to lift and are safe and reliable.

Description

Technical Field

[0001] This application relates to the field of home technology, and in particular to a bed and its adjustable bed frame. Background Technology

[0002] With the development of the home furnishing industry, people have increasingly higher requirements for the functionality of beds. Currently, electric or manual storage beds on the market, driven by a motor or manually pulled up, cause the foot of the mattress to rotate and rise. Once a certain tilt angle is reached, the raised position is locked, allowing items to be placed inside. However, the space available for placing items is limited, making it inconvenient to place items at the head of the bed, resulting in a poor user experience.

[0003] Based on the above problems, it is necessary to develop a new bed frame structure to improve the ease of use of storage beds. Summary of the Invention

[0004] To address the above technical problems, this application provides a bed and its lifting bed frame, which facilitates the retrieval and placement of items on the storage bed, and also has the advantages of simple structure and safety.

[0005] In a first aspect, this application provides a liftable bed frame, comprising:

[0006] The lower four-bar linkage includes a base bar, a short rocker arm, a long rocker arm, and a long support bar, wherein the base bar, the short rocker arm, the long support bar, and the long rocker arm are sequentially hinged to form a quadrilateral.

[0007] The upper four-bar linkage includes an upper rocker arm and a triangular bar. One end of the upper rocker arm is hinged to the middle of the long rocker arm, and the other end of the upper rocker arm is hinged to one end of the triangular bar. The middle of the triangular bar is hinged to the long support rod, and the long rocker arm, the long support rod, the triangular bar, and the upper rocker arm are hinged sequentially.

[0008] A drive unit is connected between the base rod and the short rocker arm;

[0009] During the rotation of the lower four-bar linkage, there are a first extreme position and a second extreme position. At the first extreme position, the projection of the angle between the short rocker and the driving member onto the rotation plane of the lower four-bar linkage is an obtuse angle. At the second extreme position, the projection of the angle between the short rocker and the driving member onto the rotation plane of the lower four-bar linkage is an acute angle.

[0010] By adopting the above technical solution, the lifting bed frame is formed by connecting an upper four-bar linkage and a lower four-bar linkage to create a stable linkage mechanism. The lifting of the free end of the long support rod is achieved by driving the short rocker arm to rotate through a drive component or other external force, resulting in a simple structure. When applied to a storage bed, it allows for convenient and quick lifting of the bed board, and also enables the bed board to be raised and lowered horizontally, improving the space and convenience for retrieving items. In the first extreme position, the projection of the angle between the short rocker arm and the drive component onto the rotation plane of the lower four-bar linkage is an obtuse angle, which improves the stability of the bed's sleeping function. In the second extreme position, the projection of the angle between the short rocker arm and the drive component onto the rotation plane of the lower four-bar linkage is an acute angle, ensuring structural stability when the bed board rises to open the storage space for retrieving items, reducing the risk of accidental falls.

[0011] In conjunction with the first aspect, a further embodiment is provided in which a short support rod is hinged to the end of the triangular rod away from the upper rocker arm, the hinge axis of the triangular rod and the long support rod is located between the other two hinge axes of the triangular rod, and the projection of the perpendicular line connecting the three hinge axes of the triangular rod onto a plane perpendicular to any of the hinge axes of the triangular rod forms a triangle.

[0012] By adopting the above technical solution, when the free ends of the short and long support rods are hinged to the bed board, the bed board can be raised and lowered horizontally under the drive of the driving component or external force. During the raising and lowering of the bed board, the hinge point between the short and long support rods and the bed board moves a small distance in the direction perpendicular to the raising and lowering direction, which can be approximately achieved vertical raising and lowering, reducing the risk of collision and interference with adjacent people and objects, making it more convenient to use and safer and more reasonable to operate.

[0013] In conjunction with the first aspect, a further solution is that, in the first extreme position, the hinge points at both ends of the triangular rod are located on both sides of the long rocker arm; in the second extreme position, the hinge points at both ends of the triangular rod are located on the same side of the long rocker arm.

[0014] By adopting the above technical solution, the hinge points of the short and long support rods and the bed board can move a small distance in the direction perpendicular to the lifting direction, so as to achieve approximately vertical lifting and the bed board remains approximately horizontal during the lifting process.

[0015] In conjunction with the first aspect, a further solution includes two sets of lower four-bar linkages and an upper four-bar linkage connected to the lower four-bar linkages. The two sets of lower four-bar linkages are arranged parallel to each other at intervals and are fixedly connected. One end of the driving member is hinged between the two short rockers. A reset member is also connected between the short rockers and the bottom rod.

[0016] By adopting the above technical solution, the arrangement of two sets of lower four-bar linkages and upper four-bar linkages makes the lifting and lowering of the bed frame smoother. The position of the short rocker arm driven by the drive component makes the drive more balanced, and the reset component helps the short rocker arm rotate in the reset direction when the bed frame is raised, making the reset drive less strenuous; at the first extreme position, the reset component can prevent the short rocker arm from rotating in the rising direction, making the bed frame more stable, comfortable and safe in the sleeping function.

[0017] In conjunction with the first aspect, a further solution is that, at the first extreme position, the projection of the angle between the driving member and the long support rod onto the rotation plane of the lower four-bar linkage is 155°-165°.

[0018] By adopting the above technical solution, the angle between the drive component and the long support rod is an obtuse angle much greater than 90°, which makes the bed board more stable at the first extreme position, reducing the risk of accidental lifting. At the same time, the resistance is relatively small when driving the short rocker and the long support rod to rotate to lift the bed frame, and the lifting is smooth.

[0019] In conjunction with the first aspect, a further solution is that, at the second extreme position, the angle between the driving member and the long support rod is projected onto the rotation plane of the lower four-bar linkage as 175°-180°.

[0020] By adopting the above technical solution, when the bed frame is raised to its second extreme position, the angle between the drive component and the long support rod is 175°-180°, with 180° being optimal. This makes the bed frame structure relatively stable and reduces the risk of accidental falls. Simultaneously, returning the bed from the second extreme position to the first extreme position is convenient and relatively effortless, structurally avoiding risks such as jamming and improving operational ease of use.

[0021] In conjunction with the first aspect, a further solution is that the distance between the hinge points at both ends of the long rocker is greater than the distance between the hinge points at both ends of the short rocker; the distance from the hinge point between the short rocker and the base rod to the hinge point between the long rocker and the base rod is equal to the distance between the hinge points at both ends of the long rocker; and the distance from the hinge point between the short rocker and the long support rod to the hinge point between the long rocker and the long support rod is equal to the distance between the hinge points at both ends of the short rocker.

[0022] By adopting the above technical solution, the lower four-bar mechanism rotates more smoothly. At the same time, the structure can limit the rotation range of the short rocker arm, preventing lifting and lowering beyond the first and second limit positions, thus providing an extra layer of safety protection for the bed frame and making lifting and lowering more reliable.

[0023] Secondly, this application provides a bed including a liftable bed frame as described in the first aspect.

[0024] By adopting the above technical solution, the bed with the lifting bed frame installed can achieve near-vertical lifting of the bed board when it is in a horizontal state. The structure is simple and the operation is flexible and convenient.

[0025] In conjunction with the second aspect, a further solution also includes a bed frame and a bed board, wherein the lifting bed frame is located in the middle of the bed frame, and the bed board is hinged to the free ends of the long support rod and the short support rod, respectively.

[0026] By adopting the above technical solution, the lifting bed frame is located in the middle of the bed frame, reducing the risk of fingers being pinched due to the small gap between the bed frame and the bed frame when the bed board is lowered. At the same time, storage space can be located at the edge of the bed frame for easier access. The bed board is hinged to the free ends of the long support rod and the short support rod respectively, which allows the bed board to remain horizontal during the lifting process.

[0027] In conjunction with the second aspect, a further embodiment is provided in which the bed board has a first stable state that is engaged with the bed frame and a second stable state that is disengaged from the bed frame, wherein the first stable state corresponds to the first extreme position and the second stable state corresponds to the second extreme position; wherein in the first stable state and the second stable state, the bed board is parallel to the base rod.

[0028] By adopting the above technical solution, the first stable state of the bed board corresponds to the first extreme position, realizing the sleeping function, and the second stable state of the bed board corresponds to the second extreme position, realizing the item retrieval function. In both states, the bed board and the bottom rod are parallel and horizontal. This not only realizes the sleeping function, but also improves the sleep quality by making the bed board horizontal, and provides a large operating space and a better experience in retrieving and placing items.

[0029] In summary, this application has at least one of the following beneficial technical effects:

[0030] 1. The lifting bed frame of this application has a simple structure, smooth transition between the first and second extreme positions, and high operational safety.

[0031] 2. The adjustable bed frame of this application can achieve near-vertical lifting and lowering, with minimal interference to people and objects around the bed during the lifting and lowering process, making it more convenient to retrieve and place items. It can be applied to smaller bedroom spaces and can also reduce safety risks.

[0032] 3. The lifting bed frame of this application has multiple safety guarantees through the combination of driving components, reset components, upper four-bar mechanism and lower four-bar mechanism, and the lifting process is more labor-saving.

[0033] 4. The bed of this application can achieve near-vertical lifting and lowering of the bed board, and the bed board remains horizontal during the lifting and lowering process. Through the control of the drive component, the bed board can be stably suspended at any position between the first stable state and the second stable state, which can meet the needs of users to place items of different sizes and perform various operations. Attached Figure Description

[0034] Figure 1 This is a structural schematic diagram of the second extreme position of the first embodiment of the lifting bed frame of this application;

[0035] Figure 2 This is a schematic diagram of the second extreme position of the first embodiment of the lifting bed frame of this application;

[0036] Figure 3 This is a structural schematic diagram of the first extreme position of the first embodiment of the lifting bed frame of this application;

[0037] Figure 4 This is a schematic diagram of the first extreme position of the first embodiment of the lifting bed frame of this application;

[0038] Figure 5 This is a structural schematic diagram of the second extreme position of the second embodiment of the lifting bed frame in this application;

[0039] Figure 6 This is a structural schematic diagram of the first extreme position of the second embodiment of the lifting bed frame of this application;

[0040] Figure 7 This is a structural schematic diagram of the intermediate state of the lifting bed frame in this application;

[0041] Figure 8 This is a schematic diagram of the structure of the reset component in this application;

[0042] Figure 9 This is a structural schematic diagram of the assembly of the lifting bed frame and the bed board in this application;

[0043] Figure 10 This is a schematic diagram of the first stable state structure of an embodiment of a bed according to this application;

[0044] Figure 11 This is a schematic diagram of an intermediate state structure of an embodiment of a bed according to this application;

[0045] Figure 12 This is a schematic diagram of the second stable state structure of an embodiment of a bed according to this application.

[0046] Figure label:

[0047] 1. Lower four-bar linkage; 11. Base bar; 111. Crossbar; 112. Connecting bar; 12. Short rocker arm; 13. Long support bar; 14. Long rocker arm; 2. Upper four-bar linkage; 21. Upper rocker arm; 22. Triangular bar; 3. Drive component; 4. Short support bar; 5. Reset component; 51. Adjusting component; 6. Bed board; 7. Bed frame; 71. Angle iron; a. Second limit angle; b. Second drive angle; c. First limit angle; d. First drive angle. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0052] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, features in the following embodiments can be combined with each other.

[0053] Example 1

[0054] Please see Figures 1-4 A schematic diagram of the structure of the first embodiment of the lifting bed frame.

[0055] Please see Figure 1The lifting bed frame in this embodiment includes an upper four-bar linkage 2, a lower four-bar linkage 1, a drive component 3, and a reset component 5. The lower four-bar linkage 1 includes a base rod 11, a short rocker arm 12, a long rocker arm 14, and a long support rod 13. The base rod 11, short rocker arm 12, long support rod 13, and long rocker arm 14 are sequentially hinged to form a quadrilateral four-bar linkage. The upper four-bar linkage 2 includes an upper rocker arm 21 and a triangular rod 22. One end of the upper rocker arm 21 is hinged to the middle of the long rocker arm 14, and the other end of the upper rocker arm 21 is hinged to one end of the triangular rod 22. The middle of the triangular rod 22 is hinged to the long support rod 13, and the other end of the triangular rod 22 is hinged to one end of the short support rod 4. The long rocker arm 14, long support rod 13, triangular rod 22, and upper rocker arm 21 are sequentially hinged to form a four-bar linkage. The hinge axis of the triangular rod 22 and the long support rod 13 is located between the other two hinge axes of the triangular rod 22, and the projection of the perpendicular line connecting the three hinge axes of the triangular rod 22 onto a plane perpendicular to any hinge axis of the triangular rod 22 forms a triangle. The distance between the two hinge points of the long rocker arm 14 is greater than the distance between the two hinge points of the short rocker arm 12. The distance from the hinge point of the short rocker arm 12 and the base rod 11 to the hinge point of the long rocker arm 14 and the base rod 11 is equal to the distance between the two hinge points of the long rocker arm 14. The distance from the hinge point of the short rocker arm 12 and the long support rod 13 to the hinge point of the long rocker arm 14 and the long support rod 13 is equal to the distance between the two hinge points of the short rocker arm 12.

[0056] The drive component 3 is connected between the base rod 11 and the short rocker arm 12, and the reset component 5 is also connected between the base rod 11 and the short rocker arm 12 to keep the short rocker arm 12 rotating closer to the drive component 3. In this embodiment, the reset component 5 is a tension spring and the drive component 3 is a gas spring. If the cost allows, the drive component 3 can also be an electric, pneumatic or hydraulic mechanism such as a linear motor or hydraulic cylinder to drive the short rocker arm 12 to rotate. The short rocker arm 12 drives the lower four-bar linkage 1 and the upper four-bar linkage 2 to rotate, so as to realize the lifting movement of the entire lifting bed frame.

[0057] Please see Figure 2 During the rotation of the short rocker arm 12, which drives the lower four-bar linkage 1 to rotate, it has a first limit position and a second limit position, such as... Figure 2 As shown, at the second extreme position, the projection of the second extreme angle a, which is the angle between the short rocker arm 12 and the driving member 3 in the figure, onto the rotation plane of the lower four-bar linkage 1 is an acute angle. The second driving angle b, which is the angle between the driving member 3 and the long support rod 13, is 175°-180°, with the optimal design being 180°.

[0058] Please see Figure 3 and Figure 4 Taking the driving component 3 as a gas spring as an example, pressing down the long support rod 13 causes the lower four-bar linkage 1 and the upper four-bar linkage 2 to rotate counterclockwise as shown in the figure. The long support rod 13 moves closer to the bottom rod 11, and the gas spring and the reset component 5 retract. The lower four-bar linkage 1 is in the first extreme position, that is, the lifting bed frame is in the first extreme position. Figure 4As shown, the first limit angle c, which is the angle between the short rocker arm 12 and the driving member 3, is an obtuse angle of 155°-165° projected onto the rotation plane of the lower four-bar linkage 1, with the optimum being 160°. The first driving angle d, which is the angle between the driving member 3 and the long support rod 13, is also an obtuse angle, and the long support rod 13 is approximately parallel to the bottom rod 11.

[0059] Please see Figure 1 and Figure 3 In the first extreme position, the hinge points at both ends of the triangular rod 22 are located on both sides of the long rocker arm 14; in the second extreme position, the hinge points at both ends of the triangular rod 22 are located on the same side of the long rocker arm 14.

[0060] Example 2

[0061] Please see Figures 5-8 The difference from Embodiment 1 is that the two sets of lifting bed frames in Embodiment 1 are spaced apart and arranged in parallel. The size of the interval can be set according to the size of the bed, ensuring that the lifting is stable while minimizing the distance. Figure 5 As shown in the diagram of the second extreme position, the base rods 11 of the two sets of lifting bed frames are fixedly connected by two crossbars 111. The two base rods 11, the two short rocker arms 12, the two long rocker arms 14, and the two long support rods 13 are respectively fixedly connected by connecting rods 112 to achieve a stable connection between the two sets of lifting bed frames. One end of the driving component 3 is hinged to the connecting rod 112 between the two short rocker arms 12, and the other end is hinged to the connecting rod 112 between the base rods 11. One end of the resetting component 5 is hinged to the connecting rod 112 between the base rods 11, and the other end is hinged to the connecting rod 112 between the short rocker arms 12, with the hinge point located below the driving component 3.

[0062] Please see Figure 6 At the first extreme position, the long support rod 13 moves close to the bottom rod 11, and the long support rod 13 remains parallel to the bottom rod 11. The parallelism mentioned here is not absolute because there are errors in processing and assembly. The parallelism is only approximately parallel.

[0063] Please see Figure 7 The diagram shows the intermediate state of the lifting bed frame in any position between the first and second extreme positions. In this state, the included angle between the drive component 3 and the long support rod 13 is an obtuse angle. The included angle here refers to the angle between the line connecting the two hinge points of the drive component 3 and the line connecting the long support rod 13 with the hinge points of the short rocker arm 12 and the long rocker arm 14.

[0064] Please see Figure 8 The end of the reset component 5 near the base rod 11 is also connected to the adjusting component 51. The reset component 5 is connected to the base rod 11 through the adjusting component 51. The adjusting component 51 can adjust its own length to adjust the initial length of the reset component 5. The tension of the reset component 5 can be adjusted by adjusting the adjusting component 51, thereby achieving balance during the rotation of the lifting bed frame.

[0065] Example 3

[0066] Please see Figures 9-12 This embodiment discloses a lifting bed with storage function, which uses the lifting bed frame in Embodiment 2.

[0067] Please see Figure 9 A crossbar 111 is fixedly connected below the bottom rod 11. The free ends of the long support rod 13 and the short support rod 4 are pivotally connected to the bed board 6. During the lifting and lowering of the bed frame, the plane of the bed board 6 remains parallel to the bottom rod 11, and the bed board 6 moves approximately vertically during the lifting and lowering of the bed frame.

[0068] Please see Figure 10 The bed in this embodiment also has a bed frame 7, and the bed board 6 has a first stable state that is engaged with the bed frame 7 and a second stable state that is away from the bed frame 7, such as... Figure 10 As shown, the first stable state corresponds to the first limiting position, as follows: Figure 12 As shown, the second stable state corresponds to the second extreme position. In the first and second stable states, the bed board 6 and the base rod 11 remain parallel.

[0069] Please see Figure 11 The adjustable bed frame is positioned in the middle of the bed frame 7, improving the convenience of loading and unloading items and reducing the risk of pinching hands due to the small gap between the adjustable bed frame and the bed frame 7 during the raising and lowering of the bed board 6. Both ends of the crossbar 111 and the bottom bar 11 are fixedly connected to the bed frame 7, ensuring the bottom bar 11 remains horizontal during assembly. Angle irons 71 are fixed around the inner walls of the bed frame 7. In the first stable state where the bed board 6 is engaged with the bed frame 7, the bed board 6 abuts against the angle irons 71, enhancing the stability and load-bearing capacity of the bed board 6.

[0070] Please see Figure 12 This is the second stable state of the bed board 6. In this state, the bed board 6 is suspended in the air away from the bed frame 7. In this state, items can be placed into the bed frame 7 or taken out of the bed frame 7 from the space between the bed board 6 and the bed frame 7.

[0071] The operation process or principle of this embodiment is as follows: Taking the driving component 3 as a gas spring as an example, in the first stable state, pulling the bed frame 7 upward causes the driving component 3 and the reset component 5 to extend. The bed board 6, while remaining horizontal, gradually moves approximately vertically away from the bed frame 7. Under the combined action of the driving component 3, the reset component 5, and the weight of the bed board 6, the bed board 6 can maintain balance in any position when there is no external force. In the second stable state, pressing down on the bed board 6 with your hand causes it to move downward until it abuts against the angle iron 71, reaching the first stable state, at which point you can lie down.

[0072] Taking the driving component 3 as a pneumatic or electric mechanism as an example, in the first stable state, the driving component 3 drives the short rocker arm 12 to rotate away from the bottom rod 11. Figure 11 (During clockwise rotation), as the lower four-bar linkage 1 and upper four-bar linkage 2 rotate, the short support rod 4 and the long support rod 13 push the bed board 6 to rise in parallel. Once the desired height is reached, the drive mechanism 3 stops working, and the bed board 6 hovers in the air, allowing items to be placed or removed. The drive mechanism 3 then reverses direction, driving the short rocker arm 12 to rotate, causing the bed board 6 to descend and contact the angle iron 71, returning to its first stable state.

[0073] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes, modifications, substitutions, and variations can be made to the present invention without departing from its spirit and scope, and all such changes, modifications, substitutions, and variations fall within the scope of the present invention as claimed.

Claims

1. A lifting bed frame, characterized in that, include: The lower four-bar linkage (1) includes a base bar (11), a short rocker arm (12), a long rocker arm (14), and a long support bar (13). The base bar (11), the short rocker arm (12), the long support bar (13), and the long rocker arm (14) are sequentially hinged to form a quadrilateral. The upper four-bar linkage (2) includes an upper rocker (21) and a triangular bar (22). One end of the upper rocker (21) is hinged to the middle of the long rocker (14), and the other end of the upper rocker (21) is hinged to one end of the triangular bar (22). The middle of the triangular bar (22) is hinged to the long support rod (13), and the long rocker (14), the long support rod (13), the triangular bar (22) and the upper rocker (21) are hinged in sequence. The driving component (3) is connected between the base rod (11) and the short rocker arm (12); During the rotation of the lower four-bar linkage (1), there are a first limit position and a second limit position. At the first limit position, the projection of the angle between the short rocker arm (12) and the driving member (3) on the rotation plane of the lower four-bar linkage (1) is an obtuse angle. At the second limit position, the projection of the angle between the short rocker arm (12) and the driving member (3) on the rotation plane of the lower four-bar linkage (1) is an acute angle. A reset element (5) is also connected between the short rocker arm (12) and the bottom rod (11), and the reset element (5) is a tension spring.

2. The lifting bed frame according to claim 1, characterized in that, The end of the triangular rod (22) away from the upper rocker arm (21) is hinged to a short support rod (4). The hinge axis of the triangular rod (22) and the long support rod (13) is located between the other two hinge axes of the triangular rod (22). The projection of the vertical line connecting the three hinge axes of the triangular rod (22) onto a plane perpendicular to any hinge axis of the triangular rod (22) forms a triangle.

3. The lifting bed frame according to claim 2, characterized in that, In the first extreme position, the hinge points at both ends of the triangular rod (22) are located on both sides of the long rocker arm (14); in the second extreme position, the hinge points at both ends of the triangular rod (22) are located on the same side of the long rocker arm (14).

4. The lifting bed frame according to claim 2 or 3, characterized in that, It includes two sets of lower four-bar linkages (1) and an upper four-bar linkage (2) connected to the lower four-bar linkages (1). The two sets of lower four-bar linkages (1) are arranged in parallel at intervals and fixedly connected. One end of the driving member (3) is hinged between the two short rockers (12).

5. The lifting bed frame according to claim 2 or 3, characterized in that, At the first extreme position, the angle between the driving member (3) and the long support rod (13) is projected onto the rotation plane of the lower four-bar linkage (1) as 155°-165°.

6. The lifting bed frame according to claim 2 or 3, characterized in that, At the second extreme position, the angle between the driving member (3) and the long support rod (13) is projected onto the rotation plane of the lower four-bar linkage (1) as 175°-180°.

7. The lifting bed frame according to claim 2 or 3, characterized in that, The distance between the hinge points at both ends of the long rocker (14) is greater than the distance between the hinge points at both ends of the short rocker (12); the distance from the hinge point between the short rocker (12) and the base rod (11) to the hinge point between the long rocker (14) and the base rod (11) is equal to the distance between the hinge points at both ends of the long rocker (14); the distance from the hinge point between the short rocker (12) and the long support rod (13) to the hinge point between the long rocker (14) and the long support rod (13) is equal to the distance between the hinge points at both ends of the short rocker (12).

8. A bed, characterized in that, Includes the lifting bed frame as described in any one of claims 2-7.

9. A bed according to claim 8, characterized in that, It also includes a bed frame (7) and a bed board (6). The lifting bed frame is located in the middle of the bed frame (7). The bed board (6) is hinged to the free end of the long support rod (13) and the free end of the short support rod (4).

10. A bed according to claim 9, characterized in that, The bed board (6) has a first stable state that is engaged with the bed frame (7) and a second stable state that is away from the bed frame (7). The first stable state corresponds to the first extreme position, and the second stable state corresponds to the second extreme position. In the first stable state and the second stable state, the bed board (6) is parallel to the bottom rod (11).

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