Abstract: A top unit is provided defining a upper work surface and having front, rear and opposite side marginal portions. A downwardly opening cover also having front, rear and opposite side marginal portions is provided and the rear marginal portion of the cover is pivotally supported from the rear marginal portion of the top unit for swinging about an axis generally paralleling the rear marginal portions between a closed position closely telescopingly engaged over the top unit from above and a open position extending upwardly from the rear marginal portion of the top unit.

Abstract: A work surface defining assembly is provided for use by seated persons. The assembly includes a horizontal upper work surface and includes remote transverser front and rear marginal portions. Depending front legs are supported from the assembly adjacent the opposite end portions of the front transverse marginal portion and the rear marginal portion includes transversely spaced downwardly facing abutment surface portions for engagement with and support from the upwardly facing upper surfaces of the horizontal upper leg portions of a seated person. The assembly also defines a downwardly opening cavity and the front legs and the assembly include coacting structure for upward folding of the legs into retracted positions within the cavity.