Folding bed frame

A folding bed frame comprising:

• four vertical faces:
• two ends and two sides;
• each face is formed by two slanting bars that are cross hinged together;
• the upper and lower ends of adjacent slanting bar sets are hinged together to form the whole frame structure;
• the two vertical faces are corresponding or symmetric, and each includes two sets of slanting bar sets that are hinged through to middle sections of the upper and lower angle plates;
• a vertical rod part on the cross hinging point of each set of slanting bar set, and its movable position is set by a slide bushing;
• between the two crossed slanting bars, the bar that is close to the vertical bar is the primary slanting bar, and the bar that is far from the vertical bar is the secondary slanting bar;
• the upper end of the aforementioned vertical bar part is connected to a connection plate;
• a horizontal bar is hinged to each of the two horizontal directions of the connection plate;
• the other end of each horizontal bar is hinged to the upper angle plate of the vertical face of the same side;
• a barrier that is fixed on the cross hinging point of the primary slanting bar;
• the barrier can contact the upper part aforementioned vertical bar, and form two support points with the aforementioned slide bushing for the vertical bar part.