It is a modern mechanism used in sofas and corners. The unfolding of  furniture with the incorporated mechanism consists in the seat uplifting and lowering it to the front. Simultaneously, another sleeping surface shifts out of the seat. The mechanism is very practical and easy in handling. The producer Stalmot&Wolmet SA also offers other versions of this mechanism, e.g. PF 118-5 - mechanism fixing the seat at 2,2º angle, which increases the ergonomy of the seat, or also PF 195-5 - mechanism with an automatically unfolding leg. PF 190-5 can be mounted with the unfolding leg PF 280-5.