Patent ID: 6928959

Claim:
A portable foldable arched ramp assembly comprising: (a) a plurality of adjacently positioned step links, each of said step links having a pair of compression members formed on opposing transverse ends of said step links, each of said plurality of step links including: (i) an upper surface wherein said compression members extend substantially perpendicular from said upper surface; (ii) a lower surface with a plurality of support ribs formed thereon extending from a first longitudinal side to a second longitudinal side, (iii) a plurality of regularly spaced substantially cylindrical knuckles formed on each of said longitudinal first and second sides and adapted to permit said knuckles formed on a first longitudinal side to complementarily interdigitate with said knuckles formed on a second longitudinal side of an adjacent step link, each of said substantially cylindrical knuckles having a channel transversely formed therethrough; and (iv) a plurality of protrusions, each formed on an outer surface of each of said plurality of knuckles, said protrusions being oriented in a substantially transverse direction and positioned to abut the transverse side of an adjacent step link when said assembly is fully deployed so as to impart a non-planar relation between contiguous step links; and, (b) a plurality of hinge pins respectively passing transversely through said channels of corresponding substantially cylindrical knuckles of said plurality of step links for permitting connection of and rotation of one of said step links with respect to an adjacent one of said step links, said pair of compression members of one of said step links abutting said pair of compression members of an adjacent step link when said adjacent step links are rotated to a pre-determined angle, thereby fixedly positioning adjacent contiguous step links one to the other.