The hybrid mechanism: A mix of both equally sofa mechanisms, this requires pulling, folding, or sliding a frame out to convert the sofa into a mattress. One example is, the bottom with the Report Nordby Pep Sofa Mattress slides out and more cushions elevate to create the sofa mattress surface https://gallaghery715vfq0.bloggactivo.com/30486224/what-does-queen-base-beds-mean