Abstract: A hinge positioned at the intermediate extents of the adjacent rail components to hold such components in an aligned orientation including a saddle with a central button aperture, interior plate apertures and exterior end apertures with associated rail pins for pivotally coupling the saddle and the adjacent interior ends of associated rail components, a pair of hinge plates each with a plate pin coupling the upper end of each plate to a plate aperture of the saddle, each plate having an opening extending therethrough, the plates urged away from each other, a liftable block with an elongated slot and with an associated block pin for slidably coupling the block to the saddle, the button having inclined bearing surfaces on their edges and an inwardly facing projection located at the adjacent interior edge of each adjacent rod segment, each projection having an upper curved surface and a lower planar surface receivable by the bearing opening.

Abstract: The present invention comprises a multi-component mattress comprising a pillow top detachably connected to a mattress core. The mattress core comprises a plurality of hydraulic cylinders, liquid impervious covers for the cylinders, a variety of foam cushions positioned on top of the so-encased cylinders, a resilient edging holding the cylinders in place and defining the outer perimeter of the mattress core, a moisture barrier, and a cover encasing the core members. Upon assembly, water is added to the cylinders. A unique feature of this mattress is that it is manufactured and sold in knock-down, ready-to-assemble form. This provides for compactness in shipping, ease of handling, and a substantial reduction in consumer cost. The mattress is used in combination with a planar support platform which also is disclosed.

Abstract: A zipper assembly is used to releasably attach a bag liner to a sleeping bag to retain the bag liner within the sleeping bag and to expand the bag interior to compensate for volume lost by insertion of the bag liner. The zipper assembly includes first and second pairs of spaced rows of liner zipper teeth. Two rows are secured to the existing rows of bag zipper teeth by two zipper slides. A third zipper slide releasably secures two of the other rows of liner zipper teeth to permit an individual to enter and exit the bag liner. In another embodiment of the invention, a protective cover is releasably secured to a bag by a zipper assembly.