ADJUSTABLE BED BASE

Abstract

An adjustable bed base includes a back board frame, a leg board frame and a linear actuator. The back board frame is pivotally connected to a stationary bed frame. The leg board frame is pivotally connected to the stationary bed frame. The linear actuator can drive the back board frame to rotate relative to the stationary bed frame. The adjustable bed base further includes at least one of a pull-push rod assembly, which includes a delayed pull-push structure configured to enable the first linkage element to drive the pull-push rod to move after the back board frame is driven by the linear actuator to rotate beyond a preset angle, a piled connecting assembly, and a connection reinforcing element. This adjustable bed base can reduce the lifting force required in the initial stage and has a simpler and more stable structure.

Claims

1. An adjustable bed base, comprising: a back board frame pivotally connected to a stationary bed frame, wherein a back board is arranged on the back board frame; a leg board frame pivotally connected to the stationary bed frame, wherein a leg board is arranged on the leg board frame; a linear actuator configured to drive the back board frame to rotate relative to the stationary bed frame, wherein an end of the linear actuator is pivotally connected to the stationary bed frame, and the other end of the linear actuator is pivotally connected to the back board frame; a pull-push rod assembly, through which the back board frame drives the leg board frame to move, wherein the pull-push rod assembly comprises a first linkage element, a pull-push rod and a second linkage element, a first end of the first linkage element is connected to the back board frame, a second end of the first linkage element is connected to a first end of the pull-push rod through a delayed pull-push structure, the delayed pull-push structure is configured to enable the first linkage element to drive the pull-push rod to move after the back board frame is driven by the linear actuator to rotate beyond a preset angle, and the second linkage element rotates after being pulled or pushed by the pull-push rod to drive the leg board frame to move.

2. The adjustable bed base according to claim 1, wherein the delayed pull-push structure comprises an elongated through hole arranged at the first end of the push-pull rod and a first shaft arranged at the second end of the first linkage element, the elongated through hole extends along a length direction of the push-pull rod, and the first shaft is slidably fitted in the elongated through hole.

3. The adjustable bed base according to claim 1, wherein the preset angle is 5-15.

4. The adjustable bed base according to claim 2, wherein the second linkage element comprises a first end, a second end and a third end which are not arranged on a same straight line, the first end of the second linkage element is pivotally connected to a second end of the push-pull rod, the second end of the second linkage element is pivotally connected to the stationary bed frame, and the third end of the second linkage element is provided with a roller which is in a rolling cooperation with the leg board frame.

5. The adjustable bed base according to claim 4, wherein the back board frame comprises a back board frame longitudinal rod, an end of the back board frame longitudinal rod is pivotally connected to the stationary bed frame; the first linkage element comprises a bottom plate and two side plates, the two side plates are respectively connected to two sides of the bottom plate, the bottom plate is fixed to the back board frame longitudinal rod, and two ends of the first shaft are rotatably connected to the two side plates, and the first shaft passes through the elongated through hole and is slidably fitted in the elongated through hole.

6. The adjustable bed base according to claim 4, further comprising a second linkage element supporting member, wherein the second linkage element supporting member is disposed on the stationary bed frame, and the second end of the second linkage element is pivotally connected to the second linkage element supporting member by a second shaft.

7. The adjustable bed base according to claim 1, wherein the stationary bed frame comprises a middle cross rod, a linear actuator installation base is detachably and pivotally connected to the middle cross rod, and the linear actuator is pivotally connected to the linear actuator installation base.

8. The adjustable bed base according to claim 5, wherein the leg board frame comprises a thigh board frame longitudinal rod and a calf board frame longitudinal rod, a thigh board frame is arranged on the thigh board frame longitudinal rod, a calf board frame is arranged on the calf board frame longitudinal rod, the thigh board frame longitudinal rod and the calf board frame longitudinal rod are pivotally connected to each other, an end of the thigh board frame longitudinal rod, which is closer to the back board frame, is pivotally connected to the stationary bed frame, and an end of the calf board frame longitudinal rod, which is further away from the back board frame, is pivotally connected to the stationary bed frame through a first connecting rod, and the roller is in rolling cooperation with a bottom surface of the thigh board frame longitudinal rod.

9. The adjustable bed base according to claim 8, wherein the adjustable bed base comprises two linkage mechanisms symmetrically arranged on two sides of the linear actuator, and each linkage mechanism comprises one back board frame longitudinal rod, one pull-push rod assembly, one thigh board frame longitudinal rod, one calf board frame longitudinal rod, and one first connecting rod.

10. The adjustable bed base according to claim 1, wherein the stationary bed frame comprises two stationary bed frame longitudinal rods and two stationary bed frame transverse rods, the two stationary bed frame longitudinal rods and the two stationary bed frame transverse rods are alternatively connected to each other to form a rectangular frame by four piled connecting assemblies.

11. The adjustable bed base according to claim 10, wherein each piled connecting assembly comprises one corner bed leg, one first connecting element and one second connecting element; the first connecting element is fixed to one end of one stationary bed frame longitudinal rod, the second connecting element is fixed to one end of one stationary bed frame transverse rod, one first connecting element, one second connecting element, which are piled, and one corner bed leg are connected by a first threaded fastener.

12. The adjustable bed base according to claim 11, wherein the first threaded fastener is a vertical threaded fastener; the second connecting element is connected to the stationary bed frame longitudinal rod by a horizontal threaded fastener, or the first connecting element is connected to the stationary bed frame transverse rod by a horizontal threaded fastener.

13. The adjustable bed base according to claim 12, wherein the first connecting element comprises a first groove opening upward, the second connecting element comprises a second groove opening upward, the first connecting element and the second connecting element are piled when the first connecting element and the corresponding end of the stationary bed frame longitudinal rod are accommodated in the second groove; the vertical threaded fastener comprises a first vertical bolt fixed to one corner bed leg and a first nut, the first vertical bolt passes through a bolt hole of a bottom plate of the second groove, a bolt hole of a bottom plate of the first groove and is screwed and fixed with the first nut; the horizontal threaded fastener comprises a second horizontal bolt and a second nut, the second horizontal bolt passes through a bolt hole of a vertical plate of the second groove, which is close to the stationary bed frame longitudinal rod, and a bolt hole of the stationary bed frame longitudinal rod and is screwed and fixed with the second nut.

14. The adjustable bed base according to claim 10, wherein the stationary bed frame further comprises two middle bed legs, and the two middle bed legs are respectively arranged at midpoints of the two stationary bed frame longitudinal rods.

15. The adjustable bed base according to claim 10, wherein a middle cross rod is disposed near the two middle bed legs, the middle cross rod is parallel to the two stationary bed frame transverse rods, and two ends of the middle cross rod are respectively fixed to the two stationary bed frame longitudinal rods.

16. The adjustable bed base according to claim 1, wherein the back board frame comprises a load-bearing cross rod and a back board frame longitudinal rod, the load-bearing cross rod is pivotally connected to a telescopic end of the linear actuator, a bottom end of the back board frame longitudinal rod is pivotally connected to the stationary bed frame, the back board frame longitudinal rod and the load-bearing cross rod are connected by a third threaded fastener; the adjustable bed base further comprises a connecting reinforcing element, the connecting reinforcing element is arranged at an intersection between the back board frame longitudinal rod and the load-bearing cross rod, the connecting reinforcing element comprises a first plate and a second plate connected to each other, the first plate is connected to the back board frame longitudinal rod, and the second plate is connected to the load-bearing cross rod.

17. The adjustable bed base according to claim 16, wherein the second plate is fitted and attached to the load-bearing cross rod.

18. The adjustable bed base according to claim 17, wherein an open side groove is disposed on the first plate, and the first plate is connected to the back board frame longitudinal rod by a pin that passes through both the open side groove and the back board frame longitudinal rod.

19. The adjustable bed base according to claim 18, wherein two back board frame longitudinal rods, which are connected to the load-bearing cross rod by two third threaded fasteners, are symmetrically arranged on two sides of the linear actuator, and two connecting reinforcing elements are respectively arranged at two intersections between the two back frame longitudinal rods and the load-bearing cross rod.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0030] A brief description of drawings, which are incorporated in the description of embodiments, will be provided below to illustrate technical solutions of the present application clearly. Obviously, the drawings described below are merely some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without making inventive efforts.

[0031] FIG. 1 is a schematic structural diagram from a bottom view of an adjustable bed base, which is in a flat position, in one embodiment of the present application.

[0032] FIG. 2 is an enlarged schematic structural diagram of portion A in FIG. 1.

[0033] FIG. 3 is a schematic structural diagram from a bottom view of an adjustable bed base, with a raised backboard frame and a raised leg board frame, in one embodiment of the present application.

[0034] FIG. 4 is an enlarged schematic structural diagram of portion B in FIG. 3.

[0035] FIG. 5 is an enlarged schematic structural diagram of portion C in FIG. 3.

[0036] FIG. 6 is an enlarged schematic structural diagram of portion D in FIG. 3.

[0037] FIG. 7 is a schematic structural diagram from a front-top view of an adjustable bed base in one embodiment of the present application.

[0038] FIG. 8 is an enlarged schematic structural diagram of portion E in FIG. 7.

[0039] FIG. 9 is a schematic structural diagram of an adjustable bed base in one embodiment of the present application.

[0040] FIG. 10 is a schematic structural diagram from a side-bottom view of an adjustable bed base in one embodiment of the present application.

[0041] FIG. 11 is a schematic structural diagram from a side-top view of an adjustable bed base in one embodiment of the present application.

[0042] FIG. 12 is an enlarged schematic structural diagram of portion F in FIG. 11.

[0043] FIG. 13 is an exploded schematic structural diagram of portion F in FIG. 11.

[0044] FIG. 14 is an enlarged schematic structural diagram of portion G in FIG. 11.

[0045] FIG. 15 is an exploded schematic structural diagram of portion G in FIG. 11.

[0046] FIG. 16 is a schematic structural diagram of an adjustable bed base in one embodiment of the present application.

[0047] FIG. 17 is an enlarged schematic structural diagram of portion H in FIG. 16.

[0048] FIG. 18 is a first schematic structural diagram with some components exploded of FIG. 16.

[0049] FIG. 19 is an enlarged schematic structural diagram of portion I in FIG. 18.

[0050] FIG. 20 is an enlarged schematic structural diagram of portion J in FIG. 18.

[0051] FIG. 21 is a second schematic structural diagram with some components exploded of FIG. 16.

[0052] FIG. 22 is an enlarged schematic structural diagram of portion K in FIG. 21.

DESCRIPTION OF EMBODIMENTS

[0053] To make the present application clearer and more understandable, detailed descriptions of specific embodiments will be provided below. Clearly, the described embodiments are part of the embodiments of the present application, not all of them. Based on the described embodiments of the present application, all other embodiments that can be obtained by those skilled in the art without inventive effort fall within the scope of the present application.

[0054] It should be noted that the drawings provided in the present application are merely illustrative examples of a basic concept of the present application. Therefore, only components relevant to the present application are shown in the drawings, which may be different in number, shape, size and scale in the actual implementation. The actual implementation can involve arbitrary modifications to the number, shape, size and scale of each component, and the arrangements of components may also be more complex. The structures, scales, and sizes illustrated in the drawings are intended to assist those in the art in understanding and reading the content of this specification and are not intended to define the conditions under which the present application can be implemented. Thus, they do not have substantial technical significance. Any modifications to the structure, changes in proportional relationships, or adjustments in size that do not affect the effects and objectives of the present application should still fall within the scope of the technical solutions disclosed by the present application. Additionally, terms such as left, right, middle cited in this specification are for the sake of clarity and are not intended to define the scope of what can be implemented by this application. Changes or adjustments in their relative positions, as long as they do not substantially alter the technical solutions, should also be considered within the scope of what can be implemented by the present application.

[0055] As shown in FIGS. 1-22, the present application provides an adjustable bed base including a back board frame 13, a leg board frame 20 and a linear actuator 2. The back board frame 13 is pivotally connected to a stationary bed frame 100, and a back board is arranged on the back board frame 13. The leg board frame 20 is pivotally connected to the stationary bed frame 100, and a leg board is arranged on the leg board frame 20. The linear actuator 2 is configured to drive the back board frame 13 to rotate relative to the stationary bed frame 100, where an end of the linear actuator 2 is pivotally connected to the stationary bed frame 100, and another end of the linear actuator 2 is pivotally connected to the back board frame 13. The adjustable bed base of the present application further includes at least one of a pull-push rod assembly, a piled connecting assembly 5, and a connection reinforcing element 7.

[0056] As shown in FIGS. 1-8, the back board frame 13 drives the leg board frame 20 to move through the pull-push rod assembly. The pull-push rod assembly includes a first linkage element 41, a pull-push rod 31 and a second linkage element 32, a first end of the first linkage element 41 is connected to the back board frame 13, a second end of the first linkage element 41 is connected to a first end of the pull-push rod 31 through a delayed pull-push structure. The delayed pull-push structure is configured to enable the first linkage element 41 to drive the pull-push rod 31 to move after the back board frame 13 which is driven by the linear actuator 2 to rotate beyond a preset angle, and the second linkage element 32 rotates after being pulled or pushed by the pull-push rod 31 to drive the leg board frame 20 to move.

[0057] As shown in FIG. 2, the delayed pull-push structure includes an elongated through hole 31 arranged at the first end of the push-pull rod 31 and a first shaft 42 arranged at the second end of the first linkage element 41, the elongated through hole 311 extends along a length direction of the push-pull rod 31, and the first shaft 42 is slidably fitted in the elongated through hole 311. In some embodiments, the elongated through hole may exchange position with the first shaft, that is, the elongated through hole is arranged on the first linkage element and the first shaft is arranged on the push-pull rod.

[0058] At the initial stage of the back board frame 13 moving from the angle of zero, the linear actuator 2 drives the back board frame 13 and the back board to rotate upward, and the rotation of the back board frame 13 drives the first shaft 42 on the first linkage element 41 to move in the elongated through hole 311 from the foot side of the bed to the head side of the adjustable bed base. During this period, the pull-push rod 31 will not be pulled by the first linkage block 41 and the second linkage element 32 connected to the second end of the pull-push rod 31 fails to lift the leg board frame 20. After the first shaft 42 moves to the end of the elongated through hole 311 closer to the head side of the adjustable bed base, the linear actuator 2 continues to push the back board frame 13 to drive the back board frame 13 and the back board to rotate upward. During this period, the pull-push rod 31 is pulled by the first linkage element 41 and then drives the second linkage element 32 connected to the second end of the pull-push rod 31 to lift the leg board frame 20, realizing the linkage between the back board and the leg board. That is to say, at the initial stage when the back board rotates upward from the angle of zero, the linear actuator 2 only needs to provide the power to push the back board up, and after the back board is raised to the preset angle, it drives the leg board to rise together, which reduces the power requirement of the linear actuator 2, and also reduces the strength requirements and rigidity requirements of the pull-push rod 31, the back board frame 13 and the leg board frame 20. Therefore, the cost of the linear actuator 2 and the cost of structures of the adjustable bed base such as the pull-push rod 31, the back board frame 13 and the leg board frame 20 can be saved. In addition, compared with the prior art, the linear actuator 2 directly pushes the back board frame 13, which is then in movement impartation with the leg board frame 20 through the pull-push rod assembly, making the structure of the adjustable bed base simpler and more reliable.

[0059] In some embodiments, the preset angle can be any angle within a range of 5-15. Such a preset angle not only overcomes the defect of large initial lifting force requirement and increased cost, thereby relatively saving the cost of the adjustable bed base but also makes the technical effect of the leg board linkage relationship meet the actual use needs.

[0060] As shown in FIG. 6, the second linkage element 32 includes a first end, a second end and a third end which are not arranged on a same straight line, the first end of the second linkage element is pivotally connected to a second end of the push-pull rod, the second end of the second linkage element 32 is pivotally connected to the stationary bed frame, and the third end of the second linkage element 32 is provided with a roller 324 which is in a rolling cooperation with the leg board frame. Specifically, the second linkage element 32 can be an L-shaped block, a triangular block or other special-shaped blocks. The above arrangement makes the linkage relationship of the adjustable bed base simple, stable and reliable.

[0061] As shown in FIG. 3, the back board frame 13 includes a back board frame longitudinal rod, an end of the back board frame longitudinal rod 131 is pivotally connected to the stationary bed frame 100; the first linkage element 41 includes a bottom plate and two side plates, the two side plates are respectively connected to two sides of the bottom plate, the bottom plate is fixed to the back board frame longitudinal rod 131, and two ends of the first shaft 42 are rotatably connected to the two side plates respectively, and the first shaft 42 passes through the elongated through hole 311 and is slidably fitted in the elongated through hole 311.

[0062] As shown in FIG. 6, the adjustable bed base further includes a second linkage element supporting member 326. The second linkage element supporting member 326 is disposed on the stationary bed frame 100, and the second end of the second linkage element 32 is pivotally connected to the second linkage element supporting member 326 by a second shaft 323. Specifically, the second linkage block supporting member 326 may be a square tube, a round tube or a block of other suitable shape.

[0063] The stationary bed frame 100 includes a middle cross rod 113, and a linear actuator installation base 26 is detachably and pivotally connected to the middle cross rod 113. The linear actuator 2 is pivotally connected to the linear actuator installation base 26. Therefore, the linear actuator installation base 26 can be detached from the middle cross bar 113 during transportation, which is convenient for storage and packaging, thereby making the overall packaging volume of the adjustable bed base smaller and more convenient.

[0064] As shown in FIG. 6, the leg board frame includes a thigh board frame longitudinal rod 201 and a calf board frame longitudinal rod 202, a thigh board frame is arranged on the thigh board frame longitudinal rod 201, a calf board frame is arranged on the calf board frame longitudinal rod 202, the thigh board frame longitudinal rod 201 and the calf board frame longitudinal rod 202 are pivotally connected to each other, an end of the thigh board frame longitudinal rod 201, which is closer to the back board frame 13, is pivotally connected to the stationary bed frame 100, and an end of the calf board frame longitudinal rod 202, which is further away from the back board frame 13, is pivotally connected to the stationary bed frame 100 through a first connecting rod, and the roller 324 is in rolling cooperation with a bottom surface of the thigh board frame longitudinal rod 201.

[0065] After the back board frame 13 rotates beyond the preset angle, the linear actuator 2 continues to push up the back board frame 13, driving the backboard frame 13 and the back board to rotate upward, and the pull-push rod 31 is pulled by the first linkage element 41, and the pull-push rod 31 drives the second linkage element 32 to rotate around its second end, and the roller(s) 324 arranged at the third end of the second linkage element 32 moves upward with the rotation, pushing the thigh board frame longitudinal rod 201 to rotate around the pivot corresponding to the stationary bed frame 100, and the thigh board frame longitudinal rod 201 then drives the calf board frame longitudinal rod 202 to rotate, so as to realize the lifting of the leg board frame.

[0066] The adjustable bed base includes two linkage mechanisms symmetrically arranged on two sides of the linear actuator 2. Each linkage mechanism includes one back board frame longitudinal rod 131, one pull-push rod assembly, one thigh board frame longitudinal rod 201, one calf board frame longitudinal rod 202, and one first connecting rod. The above arrangements make the symmetry, balance, stability and mechanical properties of the adjustable bed base better. Under the premise of relatively saving the cost of the adjustable bed base, the lifting movements or lowering movements of the back board and leg board is uniform, flexible, stable and reliable.

[0067] As shown in FIGS. 9-15, the stationary bed frame 100 includes two stationary bed frame longitudinal rods 110 and two stationary bed frame transverse rods 120, the two stationary bed frame longitudinal rods 110 and the two stationary bed frame transverse rods 120 are alternatively connected to each other to form a rectangular frame by four piled connecting assemblies 5.

[0068] Each piled connecting assembly 5 includes one corner bed leg 3, one first connecting element 51 and one second connecting element 52. The first connecting element 51 is fixed to one end of one stationary bed frame longitudinal rod 110, the second connecting element 52 is fixed to one end of one stationary bed frame transverse rod 120, one first connecting element 51, one second connecting element 52, which are piled, and one corner bed leg 3 are connected by a first threaded fastener.

[0069] Since the first connection element 51 is disposed on the frame longitudinal rod 110 and the second connection element 52 is disposed on the frame transverse rod 120, it is only necessary to use the first threaded fastener to screw the first connection element 51, the second connection element 52 and the four corner bed legs 3, so the connection structure has relatively few parts, and the disassembly and assembly are relatively simple and convenient. In addition, since the first connection element 51 and the second connection element 52 are piled, the contact area is relatively larger, and the connection stability will be relatively better.

[0070] As shown in FIGS. 14-15, the first threaded fastener is a vertical threaded fastener. The second connecting element is connected to the stationary bed frame longitudinal rod by a horizontal threaded fastener, or the first connecting element is connected to the stationary bed frame transverse rod by a horizontal threaded fastener. Such arrangements allow the connection to be firmly limited in both vertical and horizontal directions, with better integrity, and the connection is more firm, stable and reliable.

[0071] The first connecting element 51 includes a first groove opening upward, the second connecting element 52 includes a second groove opening upward. The first connecting element and the second connecting element are piled when the first connecting element and the corresponding end of one stationary bed frame longitudinal rod 110 are accommodated in the second groove. The vertical threaded fastener includes a first vertical bolt 53 fixed to one corner bed leg 3 and a first nut 54, the first vertical bolt 53 passes through a bolt hole of a bottom plate 522 of the second groove, a bolt hole in a bottom plate 511 of the first groove and is screwed and fixed with the first nut 54. The horizontal threaded fastener includes a second horizontal bolt 55 and a second nut 56, the second horizontal bolt 55 passes through a bolt hole of a vertical plate 521 of the second groove, which is close to the stationary bed frame longitudinal rod 110, and a bolt hole of the stationary bed frame longitudinal rod 110 and is screwed and fixed with the second nut 56. The above arrangements allow the stationary bed frame longitudinal rod 110, the stationary bed frame transverse rod 120 and the corner bed legs 3 to have a larger contact area when connected, making the connection firmer, more stable and more reliable. The vertical threaded fastener is fixed to the corner bed leg to further reduce the number of separate parts; thus the modular characteristics are more obvious, and the disassembly and assembly are simpler and more convenient.

[0072] As shown in FIGS. 9-11, the stationary bed frame 100 further includes two middle bed legs 6, and the two middle bed legs 6 are respectively arranged at midpoints of the two stationary bed frame longitudinal rods 110. After adopting the above structure, the stationary bed frame 100 of the adjustable bed base can be longer with stability. That is, as the length of the adjustable bed base increases, the support of the stationary bed frame will be stronger, and the mechanical properties of the whole bed will be better with the two middle bed legs 6 supporting the middle of the adjustable bed base.

[0073] In some embodiments, a middle cross rod 113 is disposed near the two middle bed legs 6, the middle cross rod 113 is parallel to the two stationary bed frame transverse rods 120, and two ends of the middle cross rod 113 are respectively fixed to the two stationary bed frame longitudinal rods 110. Specifically, each middle bed leg 6 is connected to a third connecting element 57 fixed to the stationary bed frame longitudinal bar 110 through a third threaded fastener 8, thus the middle bed leg 6 can be connected to the stationary bed frame longitudinal bar 110. The two ends of the middle cross rod 113 are fixed with two fourth connecting elements 58, and the fourth connecting elements 58 are respectively connected to the two stationary bed frame longitudinal rods 110 through the two fourth threaded fasteners respectively.

[0074] Such arrangements not only strengthen the support of the adjustable bed base from the two middle bed legs in the middle of the stationary bed frame length but also makes the connection structure more stable. In addition, the connection between the middle cross rod and the stationary bed frame longitudinal rods and the connection between the stationary bed frame longitudinal rods and the middle bed legs are divided into separate connection structures, which can also leave installation space for the electric drive arranged in the middle of the stationary bed frame.

[0075] In some embodiments, as shown in FIGS. 16-22, the back board frame 13 includes a load-bearing cross rod 132 and a back board frame longitudinal rod 131, the load-bearing cross rod 132 is pivotally connected to a telescopic end of the linear actuator 2, a bottom end of the back board frame longitudinal rod 131 is pivotally connected to the stationary bed frame 100, the back board frame longitudinal rod 131 and the load-bearing cross rod 132 are connected by a third threaded fastener 8. The adjustable bed base further includes a connecting reinforcing element 7, the connecting reinforcing element 7 is arranged at an intersection between the back board frame longitudinal rod 131 and the load-bearing cross rod 132. The connecting reinforcing element 7 includes a first plate 71 and a second plate 72 connected to each other, the first plate 71 is connected to the back board frame longitudinal rod 131, and the second plate 72 is connected to the load-bearing cross rod 132.

[0076] Since the connecting reinforcing element 7 is arranged at an intersection between the back board frame longitudinal rod 131 and the load-bearing cross rod 132, during the process in which the linear actuator 2 drives the load-bearing cross rod 132 and the load-bearing cross rod 132 drives the back board frame longitudinal rod 131 to rotate, most of the load impartation can be borne by the connecting reinforcing element 7 at the intersection of the load-bearing cross rod 132 and the back panel frame longitudinal rod 131, and the third threaded fastener 8 plays a role almost only in fixing the load-bearing cross rod 132 and the back board frame longitudinal rod 131 as a whole. In this way, the load-bearing cross rod 132 and the back board frame longitudinal rod 131 at the intersection will not be easily deformed, and a possible gap between the load-bearing cross rod 132 and the back board frame longitudinal rod 131 at the intersection will not be formed easily, and the rotation process of the back board frame 13 will not generate noise easily. At the same time, the firmness, stability and mechanical properties of the connection at the intersection, i.e. the connection, between the load-bearing cross rod 132 and the back board frame longitudinal rod 131 are greatly improved.

[0077] As shown in FIG. 17, the second plate 72 is fitted and attached to the load-bearing cross rod 132. Specifically, the load-bearing cross bar 132 is adapted to the shape of the second plate 72. The load-bearing cross bar 132 can be a rectangular tube, and the second plate 72 should be a flat plate to fit with the load-bearing cross bar 132; or the load-bearing cross bar 132 can also be a circular tube, and the second plate 72 should be a plate with an arc to fit the load-bearing cross bar 132. The second plate 72 is fitted and fixedly connected to the load-bearing cross bar 132, which can make the load-bearing area larger and less prone to deformation. The attachment method can be multi-point welding, multi-point screw connection, etc.

[0078] As shown in FIG. 22, an open side groove 711 is disposed on the first plate 71, and the first plate 71 is connected to the back board frame longitudinal rod 131 by a pivot 73 that passes through both the open side groove 711 and the back board frame longitudinal rod 131. The above arrangements allow the back board frame longitudinal rod 131 to be detachable from the load-bearing cross bar 132, which is convenient for storage and transportation.

[0079] In some embodiments, two back board frame longitudinal rods 131, which are connected to the load-bearing cross rod 132 by two third threaded fasteners 8, are symmetrically arranged on two sides of the linear actuator 2, and two connecting reinforcing elements 7 are respectively arranged at two intersections between the two back frame longitudinal rods 131 and the load-bearing cross rod 132. The above arrangements make the adjustable bed base more symmetrical, balanced, stable and mechanically stable.

[0080] The above description is intended to be illustrative rather than restrictive, and those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more of them) may be used in combination with each other, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations.