Adjustable bed with slidable assemblies

An adjustable bed, comprising:

• a head frame assembly, having a head frame upper rail, a head frame lower rail, and a pair of head frame side rails, each head frame side rail having a lower C steel bracket at a upper end and a higher C steel bracket at a lower end, and the higher C steel bracket having an oblong hole formed on its top;
• a first slidable assembly having a slidable assembly base and a pair of slidable assembly sides, each of the pair of slidable assembly sides being slidable within one of the pair of lower C steel brackets in a slidable assembly upward direction or a slidable assembly downward direction;
• a pair of head lift arm bracket assemblies, an lower end of each head lift arm bracket assembly being pivotally connected to one of the pair of slidable assembly sides;
• and
• a head lift platform mounted on the pair of head lift arm bracket assemblies, an upper seat platform mounted on the first slidable assembly, and a lower seat platform attached onto the higher C steel bracket of one of the pair of head frame side rails by a mounting bolt through the oblong hole such that the lower seat platform is movable relatively to the higher C steel bracket along the slidable assembly upward direction or the slidable assembly downward direction;
• and
• at least one second slidable assembly having a spacing bracket, a fixing bracket and a connecting bolt, the spacing bracket having an upper end portion mounted on the slidable assembly base of the first slidable assembly and an lower end portion having a guiding slot formed therein, and the fixing bracket being mounted on the lower seat platform, and the connecting bolt being mounted on the fixing bracket and received in the guiding slot of the spacing bracket;
• and
• a head lift motor secured to the head frame assembly for operably driving the pair of head lift arm bracket assemblies in a head lift forward direction or a head lift backward direction, wherein when the head lift motor drives the pair of head lift arm bracket assemblies in the head lift forward direction, the first slidable assembly slides in the slidable assembly upward direction, and when the head lift motor drives the pair of head lift arm bracket assemblies in the head lift backward direction, the first slidable assembly slides in the slidable assembly downward direction.