The easiest way to make a sofa, attach to frame hinges and folding legs. But now many manufacturers of the sofa all over the world use a better mechanism – folding metal frame-frame with attached “armor”, slightly convex spring plates from wood. They give the orthopedic properties of the mattress, the spine remains straight. “Plate” surface forms the base of the bed.
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“Click-Clack” – this is analogous to Evroknizhka. This is one of the most modern mechanisms of transformation, developed by French engineers. But in the design of Click-Clack provides extra intermediate position of the back “Relax” (or even two) by which a person can sit in a semi-sitting position and reclining.
The name “French bed” is a sofa this model is reminiscent of the clamshell. A bed in it made of canvas, reinforced with slats. This mechanism is not intended for daily use. This “guest” option – the metal mesh is deteriorating rapidly and starts a desperate squeak. When folded, this sofa is very compact and does not occupy much space, and its design can be quite varied.