Abstract: A modular bed frame has ladder-like side frames with upper and lower side rails, and ladder-like end frames with upper and lower rails. The side and end frames telescopingly attach to the ends of upper and lower rounded corner rails. The insides of the side frames carry tubular upright fittings for increasing vertical rigidity. These fittings also provide upwardly opening tubular sleeves that receive right angle corner connectors on the ends of spaced apart and parallel horizontal slats that traverse the bed frame from end to end when assembled by a user. Separate upright rigid legs with feet on the bottom are slidably attached to downwardly opening tubular sleeves on the underside of the assembled frame structure to elevate the assembled bed foundation above the floor.

Abstract: A modular bed frame has ladder-like side frames with upper and lower side rails, and ladder-like end frames with upper and lower rails. The side and end frames telescopingly attach to the ends of upper and lower rounded corner rails on separate corner assemblies at the four corners of the assembled foundation. The rounded corner rails are rigidly supported as a unit by upright bracing members. The insides of the side frames carry tubular upright fittings for increasing vertical rigidity. These fittings support upwardly opening tubular sleeves that receive right angle corner connectors on the ends of spaced apart and parallel horizontal slats that traverse the bed frame from end to end when assembled by a user. Separate bed-elevating assemblies positioned at or near the corner connector assemblies elevate the assembled foundation above the floor.