The bi-fold frame is an interesting frame and a more toned down sofa bed. Much more obviously bed than sofa, this frame works with 8 base slats to provide a steady night sleep. With no headboard either side, this is a very basic style of frame.
Christopher Knight Home Multi-flex Light Honey Oak Wood Futon Frame with Innerspring Mattress, Beige, Size Full
Sit, lounge or sleep on the multi-functional futon set. This unique and versatile full-size futon sofa easily converts to a full-size bed. The multicolored upholstery and light honey oak finish wood frame fits easily in most rooms.
Wood Profits - This tutorial for a DIY modern couch teaches you how to create a couch with a wood frame and leather cushions that also doubles as a desk. Discover How You Can Start A Woodworking Business From Home Easily in 7 Days With NO Capital Needed!