CN219645387U - Bed and lifting bed frame thereof - Google Patents

Abstract

The utility model discloses a bed and a lifting bed frame thereof, wherein the lifting bed frame comprises a lower four-bar mechanism, and the lower four-bar mechanism comprises a bottom bar, a short rocker, a long rocker and a long strut, wherein the bottom bar, the short rocker, the long strut and the long rocker are hinged in sequence; the upper four-bar mechanism comprises an upper rocker and a triangular bar, one end of the upper rocker is hinged with the middle part of the long rocker, the other end of the upper rocker is hinged with one end of the triangular bar, and the middle part of the triangular bar is hinged with the long supporting bar; the driving piece is connected between the bottom rod and the short rocker; the projection of the included angle between the short rocker and the driving piece on the rotation plane of the lower four-bar mechanism is an obtuse angle, and the projection of the included angle between the short rocker and the driving piece on the rotation plane of the lower four-bar mechanism is an acute angle. The bed and the lifting bed frame thereof are convenient to lift, safe and reliable.

Description

Bed and lifting bed frame thereof

Technical Field

The utility model relates to the technical field of household, in particular to a bed and a lifting bed frame thereof.

Background

With the development of the household industry, the functional requirements of people on the bed are increasing. At present, after the electric storage bed or the manual storage bed in the market is driven by a motor or manually pulled up, the tail of the mattress is driven to rotate upwards to lift, and when a certain inclination angle is reached, the lifting state is locked, so that articles can be put in. But when putting into article, operable space is less, and very inconvenient when the head of a bed places article, storing space utilization is low, and the experience that brings for the user is felt poorly.

Based on the above problems, it is necessary to develop a new bed frame structure to improve the convenience of use of the storage bed.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the bed and the lifting bed frame thereof, which are convenient for the storage bed to take and put articles and have the advantages of simple structure and safety.

In a first aspect, the present utility model provides a lifting bedframe comprising:

the lower four-bar mechanism comprises a bottom bar, a short rocker, a long rocker and a long support bar, wherein the bottom bar, the short rocker, the long support bar and the long rocker are sequentially hinged to form a quadrangle;

the upper four-bar mechanism comprises an upper rocker and a triangular bar, one end of the upper rocker is hinged with the middle part of the long rocker, the other end of the upper rocker is hinged with one end of the triangular bar, the middle part of the triangular bar is hinged with the long supporting bar, and the long rocker, the long supporting bar, the triangular bar and the upper rocker are sequentially hinged;

the driving piece is connected between the bottom rod and the short rocker;

the lower four-bar mechanism is characterized by comprising a first limit position and a second limit position in the rotation process of the lower four-bar mechanism, wherein when the first limit position is adopted, the projection of the included angle of the short rocker and the driving piece on the rotation plane of the lower four-bar mechanism is an obtuse angle, and when the second limit position is adopted, the projection of the included angle of the short rocker and the driving piece on the rotation plane of the lower four-bar mechanism is an acute angle.

Through adopting above-mentioned technical scheme, the elevating bedstead is connected by last four-bar linkage and lower four-bar linkage and is formed stable link gear, through driving piece or other external force drive short rocker rotation realization long branch free end's lift, simple structure. When the lifting device is applied to a storage bed, the lifting device can conveniently and quickly drive the bed board to lift, and can realize the horizontal lifting of the bed board, so that the space and convenience of taking and placing objects of the storage bed are improved. When the first limit position is reached, the projection of the included angle between the short rocker and the driving piece on the rotation plane of the lower four-bar mechanism is an obtuse angle, so that the sleeping function stability of the bed can be improved; and when the second limiting position is reached, the projection of the included angle between the short rocker and the driving piece on the rotation plane of the lower four-bar mechanism is an acute angle, so that the structural stability of the bed board when the opening of the storage space is opened to take and put articles is realized, and the risk of accidental falling is reduced.

In combination with the first aspect, further scheme, one end of the triangular rod far away from the upper rocker is hinged with a short supporting rod, the triangular rod and the long supporting rod are hinged between the other two hinged shafts of the triangular rod, and the projection of a perpendicular connecting line between the three hinged shafts of the triangular rod on a plane perpendicular to any hinged axis of the triangular rod forms a triangle.

Through adopting above-mentioned technical scheme, when the free end of short branch and long branch articulates the bed board, can realize the bed board horizontal lift under the drive of driving piece or external force, and at the lift in-process of bed board, short branch and long branch and the articulated point of bed board remove the distance less in the direction perpendicular with the lifting direction, approximately realize vertical lift, reduce the collision interference with four week neighbors, thing, use more conveniently, the operation is safer reasonable.

In combination with the first aspect, further, in the first limit position, hinge points at two ends of the triangular rod are located at two sides of the long rocker; and in the second limit position, the hinge points at the two ends of the triangular rod are positioned on the same side of the long rocker.

By adopting the technical scheme, the hinge points of the short support rods and the long support rods and the bed board can move less in the direction vertical to the lifting direction, the vertical lifting is approximately realized, and the bed board is kept approximately horizontal all the time in the lifting process.

In combination with the first aspect, a further scheme includes two sets of lower four-bar mechanisms and an upper four-bar mechanism connected with the lower four-bar mechanisms, two sets of lower four-bar mechanisms are arranged in parallel at intervals and fixedly connected with each other, one end of the driving piece is hinged between the two short rocking bars, and a reset piece is further connected between the short rocking bars and the bottom bar.

Through adopting above-mentioned technical scheme, the setting of four-bar mechanism and last four-bar mechanism under two sets of can make the lift of lift bedstead more steady. The driving piece drives the position between the short rockers, so that the driving is balanced, the reset piece can rotate the power-assisted short rockers to the reset direction when the bedstead is reset after being lifted, and the reset driving is more labor-saving; when the first limit position is reached, the reset piece can prevent the short rocker from rotating to the lifting direction, so that the bed frame is more stable, more comfortable and safer under the sleeping function.

With reference to the first aspect, in a further aspect, in the first limit position, a projection of an included angle between the driving piece and the long supporting rod on a rotation plane of the lower four-bar mechanism is 155 ° -165 °.

Through adopting above-mentioned technical scheme, the drive piece is for being greater than 90 obtuse angles with long branch contained angle far away, and the bed board state is more stable when making first extreme position, reduces the risk that unexpected rise, and resistance is less relatively when driving short rocker and long branch rotation realization bedstead and rising simultaneously, and it is smooth and easy to rise.

With reference to the first aspect, in a further aspect, in the second limit position, a projection of an included angle between the driving piece and the long supporting rod on a rotation plane of the lower four-bar mechanism is 180 °.

By adopting the technical scheme, when the second limit position is lifted, the bed frame structure is relatively stable, and the risk of accidental falling is reduced. Meanwhile, when the second limit position is reset to the first limit position, the operation is convenient and relatively labor-saving, the risks of blocking and the like are structurally avoided, and the convenience of operation is improved.

With reference to the first aspect, in a further aspect, the distance between the hinge points at the two ends of the long rocker is greater than the distance between the hinge points at the two ends of the short rocker; the distance from the hinge point of the short rocker and the bottom rod to the hinge point of the long rocker and the bottom rod is equal to the distance from the hinge point of the two ends of the long rocker, and the distance from the hinge point of the short rocker and the long support rod to the hinge point of the long rocker and the hinge point of the long support rod is equal to the distance from the hinge point of the two ends of the short rocker.

Through adopting above-mentioned technical scheme, lower four-bar linkage rotates more smoothly, can restrict the rotation scope of short rocker simultaneously structurally, prevents to surpass the lift of first extreme position and second extreme limit range, has one deck safety protection more to the bed frame, and it is more reliable to go up and down.

In a second aspect, the present utility model provides a bed comprising a lifting bedframe as described in the first aspect.

By adopting the technical scheme, the bed provided with the lifting bed frame can realize the approximate vertical lifting of the horizontal state of the bed plate, and has the advantages of simple structure and flexible and convenient operation.

In combination with the second aspect, the lifting bed frame is arranged at the middle position in the bed frame, and the bed plate is hinged with the free ends of the long support rods and the short support rods respectively.

Through adopting above-mentioned technical scheme, the lifting bed frame sets up the middle part position in the bed frame, and the clearance between bedstead and the bed frame is little when reducing the bed board and leads to the risk of tong, can also set up the storing space in the limit position of bed frame simultaneously, and it is more convenient to get and put. The bed board is respectively hinged with the free ends of the long support rods and the short support rods, so that the bed board can be kept horizontal in the lifting process.

With reference to the second aspect, further solutions, the bed board has a first stable state buckled with the bed frame and a second stable state far away from the bed frame, where the first stable state corresponds to the first limit position, and the second stable state corresponds to the second limit position; wherein in the first stable state and the second stable state, the bed board is parallel to the bottom rod.

Through adopting above-mentioned technical scheme, the first steady state of bed board corresponds first extreme position, realizes the function of sleeping, and the second steady state of bed board corresponds the second extreme position, realizes getting of article and puts the function, and the bed board is the horizontality with the sill bar parallel under two states, can realize the level of the function of sleeping bed board and promote sleep quality, can be in article getting and put the in-process operating space big again, gets to put article experience nature better.

In summary, the utility model has at least one of the following beneficial technical effects:

1. the lifting bed frame is simple in structure, stable in conversion between the first limit position and the second limit position and high in operation safety.

2. The lifting bed frame can realize approximately vertical lifting, has small interference to people and objects around the bed in the lifting process, can be applied to smaller bedroom space, and can also reduce safety risk.

3. The lifting bedstead is connected and combined through the driving piece, the resetting piece, the upper four-bar mechanism and the lower four-bar mechanism, has multiple safety guarantees, and saves more labor in the lifting process.

4. The bed disclosed by the utility model can realize approximately vertical lifting of the bed board, the bed board is kept in a horizontal state in the lifting process, stable hovering of the bed board at any position between a first stable state and a second stable state can be realized through control of the driving piece, and the scene requirements of a user for placing different objects and various operations can be met.

Drawings

FIG. 1 is a schematic view showing the construction of a first embodiment of the elevating frame in a second extreme position of the present utility model;

FIG. 2 is a schematic view of the elevating frame of the present utility model in a second extreme position;

FIG. 3 is a schematic view showing the structure of a first limit position of a first embodiment of the elevating bed frame of the present utility model;

FIG. 4 is an angular schematic view of a first limit position of a first embodiment of the elevating bedframe of the present utility model;

FIG. 5 is a schematic view showing the construction of a second limit position of a second embodiment of the elevating frame of the present utility model;

FIG. 6 is a schematic view showing the construction of a second embodiment of the elevating frame in a first extreme position of the present utility model;

FIG. 7 is a schematic view showing the structure of the elevating bed frame in the middle of the second embodiment of the present utility model;

FIG. 8 is a schematic view of the reset element of the present utility model;

FIG. 9 is a schematic view of the assembly of the lifting bed frame and the bed board of the present utility model;

FIG. 10 is a first steady state schematic representation of an embodiment of a bed of the present utility model;

FIG. 11 is a schematic view of an intermediate state structure of an embodiment of a bed of the present utility model;

fig. 12 is a second steady state structural schematic view of an embodiment of a bed of the present utility model.

Reference numerals:

1. a lower four-bar mechanism; 11. a bottom bar; 111. a cross bar; 112. a connecting rod; 12. a short rocker; 13. a long strut; 14. a long rocker; 2. an upper four-bar mechanism; 21. an upper rocker; 22. a triangular bar; 3. a driving member; 4. a short strut; 5. a reset member; 51. an adjusting member; 6. a bed board; 7. a bed frame; 71. angle iron; a. a second limit included angle; b. a second drive angle; c. a first limiting included angle; d. the first drive angle.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the present utility model will be described in further detail with reference to the accompanying drawings. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. Features of the embodiments described below may be combined with each other without conflict.

Example 1

Referring to fig. 1-4, a first embodiment of the lifting frame is shown.

Referring to fig. 1, the lifting bed frame of the present embodiment includes an upper four-bar mechanism 2, a lower four-bar mechanism 1, a driving member 3 and a reset member 5, wherein the lower four-bar mechanism 1 includes a bottom bar 11, a short rocker 12, a long rocker 14 and a long rocker 13, and the bottom bar 11, the short rocker 12, the long rocker 13 and the long rocker 14 are sequentially hinged to form a four-bar mechanism with a quadrilateral structure. The upper four-bar mechanism 2 comprises an upper rocker 21 and a triangular bar 22, one end of the upper rocker 21 is hinged with the middle part of the long rocker 14, the other end of the upper rocker 21 is hinged with one end of the triangular bar 22, the middle part of the triangular bar 22 is hinged with the long support bar 13, the other end of the triangular bar 22 is hinged with one end of the short support bar 4, and the long rocker 14, the long support bar 13, the triangular bar 22 and the upper rocker 21 are sequentially hinged to form the four-bar mechanism. The hinge axis of the triangular rod 22 and the long strut 13 are located between the other two hinge axes of the triangular rod 22, and the projection of the perpendicular line between the three hinge axes of the triangular rod 22 on the plane perpendicular to any hinge axis of the triangular rod 22 forms a triangle. The distance between the hinge points of the two ends of the long rocker 14 is greater than the distance between the hinge points of the two ends of the short rocker 12, the distance between the hinge points of the short rocker 12 and the bottom rod 11 and the hinge points of the long rocker 14 and the bottom rod 11 is equal to the distance between the hinge points of the two ends of the long rocker 14, and the distance between the hinge points of the short rocker 12 and the long support rod 13 and the hinge points of the long rocker 14 and the long support rod 13 is equal to the distance between the hinge points of the two ends of the short rocker 12.

The driving piece 3 is connected between the bottom rod 11 and the short rocking rod 12, the reset piece 5 is also connected between the bottom rod 11 and the short rocking rod 12, so that the short rocking rod 12 keeps a trend of rotating in a direction close to the driving piece 3, the reset piece 5 in the embodiment is a tension spring, the driving piece 3 is a gas spring, and under the condition of allowing cost, the driving piece 3 can also drive the short rocking rod 12 to rotate by an electric or pneumatic or hydraulic mechanism such as a linear motor or a hydraulic cylinder, and the short rocking rod 12 drives the lower four-bar mechanism 1 and the upper four-bar mechanism 2 to rotate so as to realize lifting movement of the whole lifting bedstead.

Referring to fig. 2, in the process of rotating the lower four-bar mechanism 1 driven by the rotation of the short rocker 12, the first limit position and the second limit position are provided, as shown in fig. 2, in the second limit position, a second limit included angle a is a projection of an included angle between the short rocker 12 and the driving member 3 on a rotating plane of the lower four-bar mechanism 1 in the figure, where the included angle refers to an included angle between a connecting line between two hinge points of the driving member 3 and a connecting line between two hinge points of the short rocker 12. The second driving angle b, that is, the angle between the driving member 3 and the long supporting rod 13 is 180 degrees, and the included angle refers to the included angle between the connecting line between the two hinge points of the driving member 3 and the connecting line between the long supporting rod 13 and the hinge points of the short rocking rod 12 and the long rocking rod 14.

Referring to fig. 3 and 4, taking the driving member 3 as an example of a gas spring, pressing down the long strut 13 rotates the lower four-bar mechanism 1 and the upper four-bar mechanism 2 in the counterclockwise direction as shown in the drawing, the long strut 13 moves close to the bottom bar 11, the gas spring and the reset member 5 shrink, the lower four-bar mechanism 1 is at a first limit position, that is, the lifting frame is at a first limit position, as shown in fig. 4, a projection of a first limit included angle c, that is, an included angle between the short rocker 12 and the driving member 3 on a rotation plane of the lower four-bar mechanism 1 is an obtuse angle of 155 ° -165 °, and is optimally 160 °, a first driving included angle d, that is, an included angle between the driving member 3 and the long strut 13 is also an obtuse angle, and the long strut 13 is approximately parallel to the bottom bar 11.

Referring to fig. 1 and 3, in the first limit position, the hinge points at the two ends of the triangular rod 22 are located at the two sides of the long rocker 14; in the second extreme position, the hinge points at the two ends of the triangular bar 22 are on the same side of the long rocker 14.

Example two

Referring to fig. 5-8, the difference between the two embodiments is that the two lifting frames are arranged in parallel at intervals, and the distance between the two lifting frames can be set according to the size of the bed, so that the distance between the two lifting frames is as small as possible under the premise of ensuring stable lifting. As shown in fig. 5, the second limit position is schematically indicated, the bottom rods 11 of the two groups of lifting frames are fixedly connected through two cross rods 111, and the two bottom rods 11, the two short rocking rods 12, the two long rocking rods 14 and the two long supporting rods 13 are respectively and fixedly connected through connecting rods 112, so that stable connection of the two groups of lifting frames is realized. One end of the driving piece 3 is hinged on a connecting rod 112 between the two short rockers 12, the other end of the driving piece is hinged on the connecting rod 112 between the bottom rods 11, one end of the reset piece 5 is hinged on the connecting rod 112 between the bottom rods 11, the other end of the reset piece 5 is hinged on the connecting rod 112 between the short rockers 12, and the hinge point is positioned below the driving piece 3.

Referring to fig. 6, in the first extreme position, the long strut 13 moves close to the bottom rod 11, and the long strut 13 remains parallel to the bottom rod 11, which is not an absolute parallelism because of processing and assembly errors.

Referring to fig. 7, an intermediate state of the lifting bed frame at any position between the first limit position and the second limit position is shown, in which the included angle between the driving member 3 and the long supporting rod 13 is an obtuse angle, where the included angle refers to the included angle between the connecting line between two hinge points of the driving member 3 and the connecting line between the long supporting rod 13 and the hinge points of the short rocking rod 12 and the long rocking rod 14.

Referring to fig. 8, the end of the restoring member 5 near the bottom rod 11 is further connected with an adjusting member 51, the restoring member 5 is connected with the bottom rod 11 through the adjusting member 51, the adjusting member 51 can adjust its own length to adjust the initial length of the restoring member 5, and the tension of the restoring member 5 can be adjusted through the adjustment of the adjusting member 51, so as to realize the balance in the rotation process of the lifting bedstead.

Example III

Referring to fig. 9-12, the present embodiment discloses a lifting bed with a storage function, and the lifting bed frame in the second embodiment is applied.

Referring to fig. 9, a cross bar 111 is fixedly connected below the bottom bar 11, the free ends of the long support bar 13 and the short support bar 4 are respectively pivotally connected with the bed board 6, the plane of the bed board 6 is always kept parallel to the bottom bar 11 during lifting of the lifting bed frame, and the bed board 6 moves approximately vertically during lifting of the lifting bed frame.

Referring to fig. 10, the bed of the present embodiment further has a bed frame 7, the bed board 6 has a first stable state buckled with the bed frame 7 and a second stable state far away from the bed frame 7, as shown in fig. 10, the first stable state corresponds to a first limit position, as shown in fig. 12, the second stable state corresponds to a second limit position, and the bed board 6 and the bottom rod 11 are kept parallel in the first stable state and the second stable state.

Referring to fig. 11, the lifting bed frame is disposed at a middle position of the bed frame 7, that is, near a center line of the bed frame 7 in a width direction, so that the space at a peripheral position of the bed frame 7 is large to facilitate placement of articles, convenience in picking and placing articles is improved, and risk of small gap clamping hands between the lifting bed frame and the bed frame 7 in a lifting process of the bed board 6 can be reduced. Both ends of the cross bar 111 and the bottom bar 11 are fixedly connected with the bed frame 7, and the bottom bar 11 is kept horizontal during assembly. Angle iron 71 is fixed around the inner wall of bed frame 7, and under the first steady state that bed board 6 had with bed frame 7 lock, bed board 6 and angle iron 71 butt promote the stability and the bearing capacity of bed board 6.

Referring to fig. 12, the bed board 6 is in a second stable state, in which the bed board 6 is suspended in the air away from the bed frame 7, and in this state, articles can be placed in the bed frame 7 from the space between the bed board 6 and the bed frame 7 or taken out from the bed frame 7.

The operation process or principle of the embodiment is as follows: taking the driving piece 3 as a gas spring as an example, in a first stable state, the bed frame 7 is pulled upwards, the driving piece 3 and the reset piece 5 are stretched, the bed board 6 is kept horizontally and gradually moves approximately vertically in the direction away from the bed frame 7, and under the combined action of the gravity of the driving piece 3, the reset piece 5 and the bed board 6, the bed board 6 can be kept balanced at any position under the action of no external force. In the second stable state, the bed plate 6 is pressed down by hand, and the bed plate 6 moves downwards until the bed plate 6 is in the first stable state against the angle iron 71, so that the sleeper can be laid.

Taking the driving member 3 as a pneumatic or electric mechanism as an example, in the first stable state, the driving member 3 drives the short rocker 12 to rotate in a direction away from the bottom rod 11 (clockwise rotation in fig. 11), and in the rotating process of the lower four-bar mechanism 1 and the upper four-bar mechanism 2, the short support rod 4 and the long support rod 13 push the bed board 6 to rise in parallel. When the required height is reached, the driving piece 3 stops working, the bed board 6 hovers in the air, and articles can be taken and placed. The driving piece 3 drives the short rocker 12 to rotate reversely, and the bed plate 6 descends to be abutted with the angle iron 71 to return to the first stable state.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the embodiments and descriptions described herein are merely illustrative of the principles of the present utility model, and various changes, modifications, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model, which are to be defined by the appended claims.

Claims (10)

1. A lifting bed frame, comprising:

the lower four-bar mechanism (1) comprises a bottom bar (11), a short rocker (12), a long rocker (14) and a long support bar (13), wherein the bottom bar (11), the short rocker (12), the long support bar (13) and the long rocker (14) are sequentially hinged to form a quadrangle;

the upper four-bar mechanism (2) comprises an upper rocker (21) and a triangular bar (22), one end of the upper rocker (21) is hinged with the middle part of the long rocker (14), the other end of the upper rocker (21) is hinged with one end of the triangular bar (22), the middle part of the triangular bar (22) is hinged with the long support bar (13), and the long rocker (14), the long support bar (13), the triangular bar (22) and the upper rocker (21) are sequentially hinged;

a driving piece (3) connected between the bottom rod (11) and the short rocker (12);

the lower four-bar mechanism (1) rotates the in-process, has first extreme position and second extreme position, when first extreme position, short rocker (12) with the projection of the contained angle on driving piece (3) lower four-bar mechanism (1) rotation plane is the obtuse angle, when second extreme position, short rocker (12) with the projection of the contained angle of driving piece (3) on lower four-bar mechanism (1) rotation plane is the acute angle.

2. Lifting bed frame according to claim 1, characterized in that one end of the triangular bar (22) far away from the upper rocker (21) is hinged with a short support bar (4), the hinge axis of the triangular bar (22) and the long support bar (13) are positioned between the other two hinge axes of the triangular bar (22), and the projection of the perpendicular connection line between the three hinge axes of the triangular bar (22) on the plane perpendicular to any hinge axis of the triangular bar (22) forms a triangle.

3. Lifting bed frame according to claim 2, characterized in that in the first extreme position the hinge points at both ends of the triangular bar (22) are located on both sides of the long rocker (14); and in the second limit position, the hinge points at the two ends of the triangular rod (22) are positioned on the same side of the long rocker (14).

4. A lifting bed frame according to claim 2 or 3, characterized by comprising two groups of lower four-bar mechanisms (1) and an upper four-bar mechanism (2) connected with the lower four-bar mechanisms (1), wherein the two groups of lower four-bar mechanisms (1) are arranged in parallel at intervals and fixedly connected, one end of the driving piece (3) is hinged between the two short rocking bars (12), and a reset piece (5) is further connected between the short rocking bars (12) and the bottom bar (11).

5. A lifting bedframe as claimed in claim 2 or 3, characterized in that in the first extreme position the angle between the driving element (3) and the long strut (13) is projected in the plane of rotation of the lower four-bar mechanism (1) by 155 ° -165 °.

6. A lifting bedframe as claimed in claim 2 or 3, characterized in that in the second extreme position the angle between the driving element (3) and the long strut (13) is projected 180 ° on the plane of rotation of the lower four-bar mechanism (1).

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

8. A bed comprising a lifting frame according to any one of claims 2-7.

9. A bed according to claim 8, further comprising a frame (7) and a bed plate (6), the lifting bed being arranged in a central position within the frame (7), the bed plate (6) being hinged to the free ends of the long struts (13) and the short struts (4), respectively.

10. A bed according to claim 9, characterized in that the bed plate (6) has a first stable state in which it is snapped into the bed frame (7) and a second stable state remote from the bed frame (7), which corresponds to the first limit position and which corresponds to the second limit position; wherein in the first and second stable states, the bed plate (6) is parallel to the bottom bar (11).