Adjustable bed

Abstract

An adjustable bed including a base frame unit, a front bed frame unit and a lumbar support unit. The front bed frame unit includes a back board which is hingedly connected relative to the base frame unit, and which is convertible between a back normal position, where an end of the back board is proximate to the base frame unit, and a back elevated position, where the end of the back board is distal from the base frame unit. The lumbar support unit includes a lumbar support, and is movably connected to the base frame unit such that in response to movement of the back board to the back elevated position from the back normal position, the lumbar support is moved to a remote position from a close position relative to the back board.

What is claimed is: 
     
         1 . An adjustable bed comprising:
 a base frame unit extending in a longitudinal direction;   a front bed frame unit including a back board which is hingedly connected relative to said base frame unit at a first axis extending in a transverse direction relative to the longitudinal direction, said back board being convertible between
 a back normal position, where an end of said back board distal from the first axis is proximate to said base frame unit, and 
 a back elevated position, where said end of said back board is distal from said base frame unit; 
   a first jack member coupled between said front bed frame unit and said base frame unit so as to permit said back board to be driven by said first jack member to convert between the back normal position and the back elevated position; and   a lumbar support unit including
 two linking bars disposed at a side of said back board same as said base frame unit, and spaced apart from each other in the transverse direction, each of said linking bars extending lengthwise to terminate at a first bar end and a second bar end which is pivoted to said base frame unit at a second axis extending in the transverse direction, 
 a lumbar support extending in the transverse direction and disposed at another side of said back board opposite to said linking bars, and 
 two lever bars spaced apart in the transverse direction, and extending respectively through two apertures of said back board, each of said lever bars having
 a pivot end connected pivotally to said first bar end of a respective one of said linking bars, 
 a connected end connected to said lumber support, and 
 a middle region disposed between said pivot end and said connected end, and pivoted to said back board at a third axis extending in the transverse direction such that in response to movement of said back board to the back elevated position from the back normal position, said lumbar support is moved to a remote position from a close position relative to said back board. 
 
   
     
     
         2 . The adjustable bed as claimed in  claim 1 , further comprising:
 two first support units disposed between said base frame unit and said front bed frame unit, and spaced apart from each other in the transverse direction, each of said first support units including a first arm having
 one end pivotably connected to said base frame unit at a fourth axis extending in the transverse direction, and 
 another end coupled to be slidable relative to said front bed frame unit between a first distal position, where said another end is distal from the first axis to support said back board at the back normal position, and a first proximate position, where said another end is proximate to the first axis to support said back board at the back elevated position; and 
   a first actuated beam extending in the transverse direction to interconnect said first arms of said first support units,   wherein said first jack member is coupled between said first actuated beam and said base frame unit so as to permit said first actuated beam to be actuated by said first jack member to turn about the second axis, thereby moving said another end of said first arm between the first distal and first proximate positions.   
     
     
         3 . The adjustable bed as claimed in  claim 2 , wherein said front bed frame unit further includes a head board hingedly connected to said end of said back board at a fifth axis extending in the transverse direction. 
     
     
         4 . The adjustable bed as claimed in  claim 3 , wherein each of said first support units further includes a rail disposed between said front bed frame unit and said first arm, and having:
 a first rail end pivotally connected to said back board;   a second rail end configured to slidably support said head board; and   a rail body disposed between said first and second rail ends to permit said another end of said first arm to be slidable relative thereto.   
     
     
         5 . The adjustable bed as claimed in  claim 4 , wherein each of said first support units further includes:
 a first roller rotatably connected to said another end of said first arm, and being in rolling contact with said rail body of said rail so as to permit said another end of said first arm to be coupled to slidable relative to said front bed frame unit; and   a second roller rotatably connected to said second rail end of said rail, and being in rolling contact with said head board so as to permit said second rail end to slidably support said head board.   
     
     
         6 . The adjustable bed as claimed in  claim 1 , further comprising a first angle piece having a first coupling end which is coupled to said first actuated beam, and a second coupling end which is opposite to said first coupling end, wherein said first jack member includes:
 a first cylinder pivotally connected to said base frame unit;   a first piston rod slidably received in said first cylinder and pivotally connected to said second coupling end so as to permit said first actuated beam to be actuated by said first jack member through said first angle piece; and   a first motor coupled to drive sliding movement of said first piston rod.   
     
     
         7 . The adjustable bed as claimed in  claim 1 , further comprising:
 a middle frame unit fixedly mounted on said base frame unit, and having a front panel to which said back board is hingedly connected about the first axis, and a rear panel opposite to said front panel in the longitudinal direction;   a rear bed frame unit disposed on said base frame unit rearwardly of said middle frame unit, and including
 a thigh board hingedly connected to said rear panel at a sixth axis that extends in the transverse direction, and 
 a calf board having a front end hingedly connected to a rear end of said thigh board distal from the sixth axis at a seventh axis that extends in the transverse direction; and 
   a second jack member coupled between said rear bed frame unit and said base frame unit so as to drive said rear bed frame unit to convert between
 a leg normal position, where said rear end of said thigh board is proximate to said base frame unit, and 
 a leg elevated position, where said rear end of said thigh board is distal from said base frame unit. 
   
     
     
         8 . The adjustable bed as claimed in  claim 7 , further comprising two link bars each having two bar ends, one of which is pivotally connected to said base frame unit, and the other one of which is pivotally connected to a rear end of said calf board so as to guide conversion of said rear bed frame unit between the leg normal position and the leg elevated position. 
     
     
         9 . The adjustable bed as claimed in  claim 7 , further comprising:
 two second arms disposed between said base frame unit and said rear bed frame unit, and spaced apart from said rear bed frame unit in the transverse direction, each of said second arms having one end which is pivotably connected to said base frame unit at an eighth axis extending in the transverse direction, and another end which is slidable relative to said calf board between a second distal position, where said another end of each of said second arms is distal from the sixth axis to support said rear bed frame unit at the leg normal position, and a second proximate position, where said another end of each of said second arms is proximate to the sixth axis to support said rear bed frame unit at the leg elevated position;   a second actuated beam extending in the transverse direction to interconnect said second arms; and   a second angle piece having two opposite coupling ends, one of which is coupled to said second jack member, and the other of which is coupled to said second actuated beam so as to permit said second actuated beam to be driven by said second jack member to turn about the eighth axis, thereby moving said another ends of said second arms between the second distal position and the second proximate position.   
     
     
         10 . The adjustable bed as claimed in  claim 9 , further comprising two third rollers, each of which is rotatably connected to said another end of a respective one of said second arms, and each of which is in rolling contact with said calf board so as to permit said another ends of said second arms to be slidable relative to said calf board. 
     
     
         11 . The adjustable bed as claimed in  claim 10 , wherein said second jack member includes:
 a second cylinder pivotally connected to said base frame unit;   a second piston rod slidably received in said first cylinder and pivotally connected to said a corresponding one of said coupling ends of said second angle piece; and   a second motor coupled to drive sliding movement of said second piston rod.   
     
     
         12 . The adjustable bed as claimed in  claim 1 , wherein said first back frame unit further includes two mount pieces which are mounted on a back surface of said back board, and which are spaced apart from each other in the transverse direction, said middle region of each of said lever bars being pivotally connected to a respective one of said mount pieces, to thereby permit said middle region to be pivoted to said back board through said respective mount piece. 
     
     
         13 . The adjustable bed as claimed in  claim 1 , wherein a first angle formed between said base frame unit and said back board ranges from 0 to 100 degrees. 
     
     
         14 . The adjustable bed as claimed in  claim 3 , wherein a second angle formed between said head board and said back board ranges from 120 to 180 degrees. 
     
     
         15 . The adjustable bed as claimed in  claim 7 , wherein a third angle formed between said calf board and said thigh board ranges from 120 to 180 degrees. 
     
     
         16 . The adjustable bed as claimed in  claim 1 , wherein:
 a fourth angle formed between each of said lever bars and said respective one of said linking bars ranges from 0 to 100 degrees;   when said back board is at the back normal position, the fourth angle ranges from 0 to 10 degrees; and   when said back board is at the back elevated position, the fourth angle ranges from 80 to 100 degrees.