Patent 4870711 Issued on October 3, 1989. Estimated Expiration Date: November 14, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
A metal foundation for a bed comprises a modular system of components easily assembled without conventional fasteners. The assembly includes parallel tubular side frame members of rectangular cross-section, each having two L-shaped pieces interlocked lengthwise in a sliding fit. Vertical stiffening ribs spaced apart along the inside and outside faces of the rectangular side members add rigidity. A pair of parallel tubular rectangular end frame members similar to the side members are at opposite ends of the foundation. Four L-shaped and tubular corner connectors of rectangular cross-section provide sockets to slidably receive the ends of the side and end frame members at the corners of the foundation. Longitudinal and lateral inverted U-shaped cross-slats slidably fit into corresponding slots in the inside faces of the side and end frame members. Tapered vertical legs with casters slidably extend into flange openings at the corners of the corner connectors for holding the assembled foundation in a fixed position spaced above the floor. The tops and sides of the assembled foundation are covered with cloth, and hooks at lower inside surfaces of the side and end frame members capture the edges of the cloth covering.