The hybrid mechanism: A mix of equally sofa mechanisms, this involves pulling, folding, or sliding a frame out to convert the sofa into a bed. Such as, the bottom from the Short article Nordby Pep Sofa Mattress slides out and much more cushions raise to create the sofa mattress area. https://emilioyumha.blogofoto.com/62289205/boards-for-beds-for-dummies