Knock-down cupboard

Claim 1

A boltless sheet metal cupboard or cabinet assembly having: a top wall; a bottom wall; a back wall; and opposed side walls; a flange on the back longitudinal edge of each side wall, a hem on the edge of each flange that forms a U-configuration with its open end facing its respective side wall; a hem on each of the side edges of said back wall that forms a U-configuration with its open end facing the open end of the hem on the other side edge, the hems on the back wall and the hems of the side walls being adapted to interlock with each other; an open front; a door hingeable to close the open front; the front longitudinal edge of each side wall being formed with a channel; a rigidifying top bar having a stab connector at each of its ends for entry into the channel of one of the side walls whereby to extend between the side walls at the top front and space them apart in operative position in use; a rigidifying bottom bar having a stab connector at each of its ends for entry into the channel of one of said side walls whereby to extend between the side walls at the bottom front and space them apart in operative position in use; the top wall having downwardly extending flanges along each of its edges; the downwardly extending flange along the front edge of the top wall having an inwardly projecting locking flange at its lower edge adapted to snap over the lower marginal edge portion of the edge of the rigidifying top bar; the downwardly extending flange along the back edge of the top wall having a hem that forms a U-configuration with its open end facing upwardly; the upper edge of the back wall having an outwardly directed hem that forms a U-configuration with its open end facing downwardly that is adapted to interlock with the hem on the flange on the back edge of the top wall;