Foldable adjustable bed frame

A large sized adjustable bed frame configured to be foldable for easy shipping, said adjustable bed frame comprising:

• a bottom frame having a top surface and a bottom surface;
• a multi-sectional adjustable frame disposed on said bottom frame top surface, said multi-sectional adjustable frame consisting of an adjustable back frame, a first fixed hip frame, a second fixed hip frame, an adjustable thigh frame, and an adjustable calf frame, each of said multi-sectional adjustable frames having a left side and a right side;
• a multiplicity of extension frames rotatably attached to the adjustable frames;
• wherein said bottom frame consists of a U-shaped front frame and a U-shaped rear frame foldably attached to each other by means of a main frame hinge;
• said U-shaped front frame having two front frame arms and a front frame cross bar attached between said front frame arms, and said U-shaped rear frame having two rear frame arms and a rear frame cross bar attached between said rear frame arms, wherein said U-shaped rear frame is smaller than the U-shaped front frame such that said U-shaped rear frame can fold and fit within said U-shaped front frame;
• said U-shaped front frame and a U-shaped rear frame further having a top surface and a bottom surface;
• wherein said first fixed hip frame is attached to said top surface of said front frame, said adjustable back support frame is rotatably attached to said first fixed him frame, said second fixed hip frame is attached to the top surface of said rear frame, said adjustable thigh frame rotatably attached to said second fixed hip frame, and said adjustable calf frame rotatably attached to said adjustable thigh frame;
• wherein said adjustable back frame has a left and right side extension frames foldably attached thereto, said first fixed hip frame has a left and right side first fixed extension frames attached thereto, said second fixed hip frame has a left and a right side second fixed hip extension frames foldably attached thereto, said adjustable thigh frame has a left and right side thigh extension frames foldably attached thereto, and said adjustable calf frame has a left and right side calf extension frames foldably attached thereto;
• wherein each of said adjustable frames further have a left and a right side, both sides having:
• two transverse extension portions parallel to each other, and a longitudinal rod connected with the two transverse extension portions;
• said extension frame having two support arms corresponding in position to the two transverse extension portions of the adjustable frame, and two stopping portions disposed with the two support arms, respectively;
• and
• two linkages each having two ends pivotally connected with one of the two transverse extension portions and one of the two support arms in a way that each of the two linkages is abutted against a top edge of one of the stopping portions and a top edge of one of the longitudinal rods;
• wherein the extension frame is upwardly foldable together with the two linkages to swing to a top side of the adjustable frame in a way that the two support arms are in contact with the two transverse extension portions, thereby reducing the overall width of the bed frame, with a minimal increase in thickness of the folded frame;
• wherein said extension frames fold against a top surface of said adjustable frames to reduce the width of the frame with minimal thickness;
• and wherein when said adjustable frames are folded flat, said extension frames are folded onto said adjustable frames, and said bottom frames are folded together, the overall dimensions of the bed frame are of a size to accommodate shipping.