Abstract: Molded plastic cover pieces and mating fabric or hard-side sidewall panel assemblies are disclosed for mounting over a storage container. The cover piece provides several raised rails at perimeter edges and rails defining tine receiving lifting channels that contain sub-frame members that stiffen the cover and facilitate attachment of the cover and side walls to form a complete cover assembly. Single panel and thermally bonded multi-panel cover assemblies are disclosed. Bracing members and/or embossed surfaces at the rails and tine receiving channel cover pieces strengthen the covers and direct water runoff Fabric or expansible hinges provide flexible transitions at intersecting sidewall corners. Alternative cover assemblies provide lifting towers, panels with tine receiving apertures or interconnected tension members.

Abstract: Several molded, hard plastic cover pieces and attached fabric or hard side wall assemblies are disclosed for mounting over a storage container. One cover piece provides raised channel rails that support a layered sub frame assembly. The sub frame secures fabric or plastic side wall assemblies to the cover piece. Fabric or expansible hinge pieces mount between fabric or plastic panels to provide flexible transitions to facilitate the mounting and removal of the cover piece and/or sidewall assembly. Cross pieces fitted to channel rails define lifting supports to permit attachment or removal of the cover piece from a wooden storage container. Truss pieces formed between channel pieces strengthen and control water runoff. Alternative cover pieces provide lifting towers, panels with tine receiving apertures or interconnected tension members.

Abstract: Molded plastic cover pieces and mating fabric or hard-side sidewall panel assemblies are disclosed for mounting over a storage container. The cover piece provides several raised rails at perimeter edges and rails defining tine receiving lifting channels that contain sub-frame members that stiffen the cover and facilitate attachment of the cover and side walls to form a complete cover assembly. Single panel and thermally bonded multi-panel cover assemblies are disclosed. Bracing members and/or embossed surfaces at the rails and tine receiving channel cover pieces strengthen the covers and direct water runoff Fabric or expansible hinges provide flexible transitions at intersecting sidewall corners. Alternative cover assemblies provide lifting towers, panels with tine receiving apertures or interconnected tension members.

Abstract: Several molded, hard plastic cover pieces and attached fabric or hard side wall assemblies are disclosed for mounting over a storage container. One cover piece provides raised channel rails that support a layered sub frame assembly. The sub frame secures fabric or plastic side wall assemblies to the cover piece. Fabric or expansible hinge pieces mount between fabric or plastic panels to provide flexible transitions to facilitate the mounting and removal of the cover piece and/or sidewall assembly. Cross pieces fitted to channel rails define lifting supports to permit attachment or removal of the cover piece from a wooden storage container. Truss pieces formed between channel pieces strengthen and control water runoff. Alternative cover pieces provide lifting towers, panels with tine receiving apertures or interconnected tension members.

Abstract: An electron source includes a negative electron affinity photocathode on a light-transmissive substrate and a light beam generator for directing a light beam through the substrate at the photocathode for exciting electrons into the conduction band. The photocathode has at least one active area for emission of electrons with dimensions of less than about two micrometers. The electron source further includes electron optics for forming the electrons into an electron beam and a vacuum enclosure for maintaining the photocathode at high vacuum. In one embodiment, the active emission area of the photocathode is defined by the light beam that is incident on the photocathode. In another embodiment, the active emission area of the photocathode is predefined by surface modification of the photocathode. The source provides very high brightness from an ultra-small active emission area of the photocathode.