Bedstead assembly with a foldable support frame

A bedstead assembly comprising a rigid support frame, a top plate unit disposed on and above said support frame, and an electrical air pump unit disposed at least partially within said bedstead assembly, wherein said support frame is convertible between unfolded and folded states, wherein said support frame further comprises at least one pivot unit, a first foldable frame member, and a second foldable frame member having an end connected pivotally to an end of said first foldable frame member by said pivot unit, each of said first and second foldable frame members including two parallel non-foldable plates and two foldable plates, the non-foldable plates pivotally interconnected with said foldable plates to define a void space when said support frame is in the unfolded state, each of said foldable plates including two pivotable plate portions having outer ends connected respectively and pivotally to said non-foldable plates such that each of said pivotable plate portions is pivotable relative to a corresponding one of said non-foldable plates about a first axis, and inner ends interconnected pivotally, said first and second foldable frame members having respectively aligned top surfaces, said pivot unit being disposed adjacent to said top surfaces such that one of said first and second foldable frame members is pivotable about a second axis to abut against said top surface of the other of said first and second foldable frame member, said first and second axes forming an angle therebetween, said pivotable plate portions being generally perpendicular to said non-foldable plates when said support frame is in the unfolded state and being generally parallel to said non-foldable plates when said support frame is in the folded state.