Abstract: Cooperating male and female track assemblies associated with otherwise conventional pickup truck body open beds and covers or canopies so that a cover or canopy may be easily alid onto and off of the truck body bed. The male and female tracks have a variety of cross-section configurations and one or the other or both of the tracks have an elongate channel formed in an exposed surface through which conventional headed fasteners are inserted with the fasteners heads received entirely within the channel or channels so that any interference fit between the tracks is prevented and the hitherto requirement for countersunk fasteners is eliminated.

Abstract: A continuously and adjustably inflatable cushion supports the entire body length of a prone, face down, expectant mother, and is shaped to accommodate and conform to the enlarged contours of her body during pregnancy and immediately afterward. An essentially circular opening passes completely through the central portion of the supporting cushion, to surround and partially support the enlarged abdomen of the expectant mother. The depth and softness of this opening is varied during progressive stages of pregnancy through a valve mechanism, to add or release air.When deflated, the cushion is folded into a compact, lightweight configuration for economical packaging and storage. The inflatable cushion has the additional advantages of light weight and portability in either its collapsed or inflated configurations; continuous range of adjustment to accommodate the shape of a human body; and the cushion is preferably constructed from material which is non-flammable, odor free and easily cleaned.