Bed to a sofa conversion frame with movable back

A stand-alone furniture frame, where the furniture frame is configured to convert a bed into a sofa, the bed comprising i) a conventional manufactured mattress, or ii) a conventional manufactured mattress and a box spring, or iii) a conventional manufactured mattress and a two rail frame, optionally with a box spring, where the conventional manufactured mattress is a mattress manufactured for traditional beds and is not configured to be folded when converted into the sofa,

• the furniture frame comprising:
• a backrest;
• a footer;
• a pair of armrests forming a base;
• and
• a space defined by the backrest, footer, and armrests, the space configured to be filled by the bed,
• wherein the backrest, footer and armrests, as a unitary piece or when connected together to form an assembled frame, form a frame configured for surrounding the bed to convert the bed into the sofa such that at least a portion of an upper surface area of the bed forms a seating area of the sofa, and
• wherein the backrest is movable from a sofa position to a bed position, in order to convert the frame from a sofa configuration to a bed configuration.