US Patent 10159349 Folding sofa

A folding sofa that includes symmetrical armrest bars on both sides, front support bars and rear support bars, as well as a fabric seat. The armrest bar consists of a curved U-shaped bar with a symmetrical armrest section and U-shaped portion. The armrest section is formed in a wave shape that starts low in the front and rises high in the rear, with the front lower portion also being attached to an armrest auxiliary bar to provide support for resting the forearms. The rear support bars, after hinging to the armrest bars, have extended sections protruding forward to support the front edge of the fabric seat cushion.