Sofa bed has seat mounted on wheeled carriage, allowing it to be pulled out, back rest then being lowered to form part of mattress and carriage having side rails which support the back rest frame and lowered back rest

摘要

The sofa bed has a seat (7) mounted on a wheeled carriage (5), allowing it to be pulled out. The back rest (13) is then lowered to form part of the mattress. The carriage has side rails (10) which support the back rest frame (11) and the lowered back rest.