Abstract: An assemblable and disassemblable, convertible sofa characterized by the concealment and, therefore, the visual absence of fasteners after the sofa has been assembled. Where two parts are to be joined, a metallic insert having internal and external threads is inserted into one of the parts to be joined. A screw passes through the other part to be joined and matingly engages the internal threads of the insert. In the assembled condition of the sofa, the arm rests are secured to a base frame by means of fasteners that extend in an outward direction from an internal portion of the base assembly of the sofa. The back wall of the sofa is similarly assembled. A sliding board is mounted on the top wall of the base assembly and is movable between the opened and closed positions of the sofa.

Abstract: A fastening device for two members that is particularly suited for use in the so-called "knock-down" furniture comprises a metallic insert formed with a bore and threaded into one of the members so as to be flush therewith. The other member is formed with an aperture that is in registration with the bore when the two members are in mutual contact. A screw is received through the aperture to threadably engage the bore. Tightening on the screw detachably fastens the members as the insert acts as a seat for the other member and acts to distribute the load thereon over its larger peripheral area.