CLARK - The special features of this patented bed-mechanism allow the opening and the closing of the sofa with a simple movement only, without removing seat and back cushions, which remain clung to the frame of the mechanism. Mechanism frame: in high resistance metal tube painted with epoxy powder. Arms, back and front band: fixed with bayonet joints for an easy disassembly during the transport and then a practical reassembly. Welded orthopedic bedspring. Spring mattress cm. 200 x 15h. (tollerance more or less 1%). Arms’ frame, back and front band: made of solid wood and derived materials. Upholstery: made of expanded polyurethane, covered with dacron. Seat and back cushions:made of polyurethane 30 kg/ m3, covered with thermobound fibres lined in pure cotton fabric.