Abstract: A wall assembly suitable for use on ships and offshore drilling platforms and in similar applications requiring fire resistance, low weight, and strength. The wall assembly includes a light weight principal panel having first and second fiber reinforced polymer skin layers joined to a core, and a metal frame adhered to the skin layers without any through fasteners. The frame preferably includes a first metal plate adhered to the first skin layer and a second metal plate adhered to the second skin layer and welded to the first metal plate. The frame is preferably welded to a metal support structure. The wall assembly may be used as a deck, floor, roof, vertical wall, gate or door.

Abstract: The self-locking chock system has a plurality of pawl cams grouped in a sequential alignment along a support member that is substantially parallel with a leg rack of a jack-up rig unit. Each of the cams is pivoted about a pivot axis that is on the common alignment axis of the support member, and is forced to ride upon the leg rack by a center of gravity located outwardly from the alignment axis on the side opposite that which rides on the leg rack. The cam profile is adapted to ride along the leg rack profile when the relative motion between the leg rack and the support member is in a first direction. When the relative motion is in a direction opposite to the first direction, the cam profile complements the leg-rack profile and under the weighted urging of the cam, the cam profile engages the leg-rack profile and enters into a positive, self-locking engagement that restrains further relative motion between the leg rack and the support member at least in the opposite direction.