Adjustable bed

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.