Sofa bed

A sofa bed, comprising:

• a plurality of elastic modules, each comprising a conical spring and a spring bracket configured to receive the conical spring;
• a body frame comprising a plurality of longitudinal supporting members arranged to intersect perpendicularly a plurality of transverse supporting members;
• armrest frames at opposite sides of the body frame;
• each supporting member having a slide rail configured to engage with a bottom portion of a corresponding spring bracket with the plurality of elastic modules arranged to slide on the slide rails;
• each longitudinal supporting member having a longitudinal slide rail;
• each transverse supporting member having a transverse slide rail;
• the longitudinal slide rails intersecting the transverse slide rails to allow the elastic modules to be moved longitudinally and transversely on the body frame;
• the elastic modules mountable onto the body frame via an open end of one or more of the longitudinal or transverse slide rails.